125-644: One Canada Square is a skyscraper in Canary Wharf , London. It is the third tallest building in the United Kingdom at 770 feet (235 m) above ground level , and contains 50 storeys. It achieved the title of the tallest building in the UK upon completion in 1991 and held the title for 21 years until the completion of The Shard (310m) in 2012. One Canada Square was designed by César Pelli with Adamson Associates and Frederick Gibberd Coombes. The building
250-463: A Buttressed core . Trussed tube and X-bracing: Sir Robert McAlpine Sir Robert McAlpine Limited is a family-owned building and civil engineering company based in Hemel Hempstead , England. It carries out engineering and construction in the infrastructure, heritage, commercial, arena and stadium, healthcare, education and nuclear sectors. Robert McAlpine was born in 1847 in
375-539: A garden city at Hamilton, South Lanarkshire . Relying now on the income from his estate, McAlpine’s attention moved away from his contracting business towards self-education. However, the financial panic following the collapse of the City of Glasgow Bank in 1878 virtually wiped out McAlpine financially: his mortgages were called in but his debtors did not pay him. The liabilities from the Hamilton estate were threatening
500-541: A city consisting entirely of high-rise housing is the 16th-century city of Shibam in Yemen . Shibam was made up of over 500 tower houses, each one rising 5 to 11 stories high, with each floor being an apartment occupied by a single family. The city was built in this way in order to protect it from Bedouin attacks. Shibam still has the tallest mudbrick buildings in the world, with many of them over 30 m (98 ft) high. An early modern example of high-rise housing
625-469: A condensate collection system, which uses the hot and humid outside air, combined with the cooling requirements of the building and results in a significant amount of condensation of moisture from the air. The condensed water is collected and drained into a holding tank located in the basement car park. One Canada Square has 3,960 windows and was one of the first buildings to incorporate metallicised windows and other advanced window technologies, to assist with
750-561: A contract for the Lanarkshire and Ayrshire Railway without the necessary technical knowledge, the subsequent rebuilding work and litigation meant another fresh start. In 1887, Robert took his two eldest sons, Robert junior and William, out of school to help him, with Malcolm and Alfred following soon after, and they did much to rationalise the firm’s administration and finances. Undaunted by his earlier experience, McAlpine took on further railway contracts, this time successfully, including
875-418: A gearless traction machine. They have woven steel cables called hoisting ropes that are attached to the top of the lift cabin and wrapped around the drive sheave in special grooves. The other ends of the cables are attached to a counterweight that moves up and down in the hoistway on its own guiderails. It takes 40 seconds by lift from lobby to top floor (The Canary Wharf website has not been updated to include
1000-475: A huge cofferdam to seal construction from water. It also involved driving 222 piles into the ground at 23 metres deep. Also, a 4-metre thick concrete raft was sunk into the dock to act as anchor. By June 1990, the tower had overtaken Tower 42 (previously known as the NatWest Tower), becoming the tallest building in the United Kingdom. On 8 November 1990, the tower was topped out when the top piece of
1125-751: A more classical approach came back to global skyscraper design, that remains popular today. Examples are the Wells Fargo Center , NBC Tower , Parkview Square , 30 Park Place , the Messeturm , the iconic Petronas Towers and Jin Mao Tower . Other contemporary styles and movements in skyscraper design include organic , sustainable , neo-futurist , structuralist , high-tech , deconstructivist , blob , digital , streamline , novelty , critical regionalist , vernacular , Neo Art Deco and neohistorist , also known as revivalist . 3 September
1250-399: A particularly small surface area of what are conventionally thought of as walls. Because the walls are not load-bearing most skyscrapers are characterized by surface areas of windows made possible by the concept of steel frame and curtain wall. However, skyscrapers can also have curtain walls that mimic conventional walls and have a small surface area of windows. The concept of a skyscraper is
1375-420: A product of the industrialized age , made possible by cheap fossil fuel derived energy and industrially refined raw materials such as steel and concrete . The construction of skyscrapers was enabled by steel frame construction that surpassed brick and mortar construction starting at the end of the 19th century and finally surpassing it in the 20th century together with reinforced concrete construction as
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#17327732454781500-454: A proto-skyscraper, or to New York's seven-floor Equitable Life Building , built in 1870. Steel skeleton construction has allowed for today's supertall skyscrapers now being built worldwide. The nomination of one structure versus another being the first skyscraper, and why, depends on what factors are stressed. The structural definition of the word skyscraper was refined later by architectural historians, based on engineering developments of
1625-412: A proud and soaring thing, rising in sheer exaltation that from bottom to top it is a unit without a single dissenting line. Some structural engineers define a high-rise as any vertical construction for which wind is a more significant load factor than earthquake or weight. Note that this criterion fits not only high-rises but some other tall structures, such as towers . Different organizations from
1750-571: A skyscraper today, it was record setting. The building of tall buildings in the 1880s gave the skyscraper its first architectural movement, broadly termed the Chicago School , which developed what has been called the Commercial Style. The architect, Major William Le Baron Jenney , created a load-bearing structural frame. In this building, a steel frame supported the entire weight of the walls, instead of load-bearing walls carrying
1875-417: A small surface area of windows. Modern skyscrapers often have a tubular structure , and are designed to act like a hollow cylinder to resist wind, seismic, and other lateral loads. To appear more slender, allow less wind exposure and transmit more daylight to the ground, many skyscrapers have a design with setbacks , which in some cases is also structurally required. As of September 2023 , fifteen cities in
2000-521: A time, the tallest of which is the 97.2 m (319 ft) high Asinelli Tower. A Florentine law of 1251 decreed that all urban buildings be immediately reduced to less than 26 m. Even medium-sized towns of the era are known to have proliferations of towers, such as the 72 towers that ranged up to 51 m height in San Gimignano . The medieval Egyptian city of Fustat housed many high-rise residential buildings, which Al-Muqaddasi in
2125-541: A traditional roof circuit for its lightning protection system. The roof holds 5 lightning conductor rods. This rooftop network of conductors contain multiple conductive copper paths from the roof to the ground. The steel cladding does not form part of the lightning protection system, as it was considered too dangerous. At the peak cooling times, the HVAC ( climate control ) system requires cooling equivalent to that provided by 2,000 t of melting ice in one day. The building has
2250-480: A transport interchange from Canary Wharf tube and Docklands Light Railway stations. Access from the basement also links to Canada Square shopping mall. The floors above the lobby are not open to the public, as they contain offices. There are many art works on display in the lobby. This includes the stained glass and the roundel in the foyer were designed by Charles Rennie, and are an original design. The design represents Canary Wharf, Water and Boats, illustrating
2375-466: A variety of shapes, and it could be riveted, ensuring strong connections. The simplicity of a steel frame eliminated the inefficient part of a shear wall, the central portion, and consolidated support members in a much stronger fashion by allowing both horizontal and vertical supports throughout. Among steel's drawbacks is that as more material must be supported as height increases, the distance between supporting members must decrease, which in turn increases
2500-469: A vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation". Closely spaced interconnected exterior columns form the tube. Horizontal loads (primarily wind) are supported by the structure as a whole. Framed tubes allow fewer interior columns, and so create more usable floor space, and about half the exterior surface is available for windows. Where larger openings like garage doors are required,
2625-437: A very long life and requires little maintenance. Light intensity achieved is well in excess of the required 2,000 candelas. It uses low power consumption and the unit can be flashing or steady. There is electrical equipment that regulates the power to the rest of the building on the mezzanine floor. Some of the electrical generators on the mezzanine floor are powered by micro-hydro water turbines, sourced by water pumped up to
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#17327732454782750-412: Is an important feature of the building, enclosing a maintenance plant and housing facilities for water supply and window washing, and an aircraft warning beacon. The pyramid itself is 40 metres high and 30 metres square at the base. It is made from stainless steel and is held together by 100,000 nuts and bolts, with a weight of over 100 tons. A louvre access door opens to allow a shining beacon to identify
2875-444: Is by any standard a triumph of ambition, commitment and collaboration. It will breathe life into Canary Wharf, allowing us to continue our transformation of the rest of the wharf, and will put Canary Wharf at the leading edge of real estate." The majority of the tower was empty after opening because most tenants had not moved in yet and there was a global recession . To brighten up the tower, lights and lasers were installed during
3000-400: Is clad with stainless steel. One of the predominant features of the building is the pyramid roof, which contains a flashing aircraft warning light, a rare feature for buildings in the United Kingdom. The distinctive pyramid pinnacle is 800 feet (240 m) above sea level . One Canada Square is primarily used for offices, though there are some retail units on the lower ground floor. There
3125-406: Is important in most building design, but particularly for skyscrapers since even a small chance of catastrophic failure is unacceptable given the tremendous damage such failure would cause. This presents a paradox to civil engineers : the only way to assure a lack of failure is to test for all modes of failure, in both the laboratory and the real world. But the only way to know of all modes of failure
3250-433: Is largely from the force of the building material itself. In most building designs, the weight of the structure is much larger than the weight of the material that it will support beyond its own weight. In technical terms, the dead load , the load of the structure, is larger than the live load , the weight of things in the structure (people, furniture, vehicles, etc.). As such, the amount of structural material required within
3375-449: Is no observation floor. It is a prestigious location for offices and as of October 2017 was completely let. The building is recognised as a London landmark, and it has gained much attention through film, television, and other media as one of the tallest buildings in the United Kingdom . The original plans for a business district on Canary Wharf came from G Ware Travelstead . He proposed three 260 m (850 ft) towers. Travelstead
3500-414: Is no universally accepted definition, other than being very tall high-rise buildings . Skyscrapers may host offices, hotels, residential spaces, and retail spaces. One common feature of skyscrapers is having a steel frame that supports curtain walls . This idea was invented by Viollet le Duc in his discourses on architecture. These curtain walls either bear on the framework below or are suspended from
3625-427: Is pumped up to the pyramid roof, and is continuously replenished. A common sound that is heard inside the pyramid roof is water being moved around. The water is used for general water requirements, such as toilets, etc. The tower consumes an average of 200,000 imperial gallons (910,000 L) of water per day. The building maintenance units for washing the building windows are stored on the roof. There are two BMUs on
3750-420: Is sufficient heat acting on any sprinkler head (which are independent of each other and do not operate in unison). The only time when One Canada Square was fully evacuated was on 30 October 2001, during a test drill in response to the 11 September 2001 attacks . The test drill was unsuccessful as tenants were notified beforehand, hence evacuation was much quicker than expected by Canary Wharf Security. When
3875-399: Is the global commemorative day for skyscrapers, called "Skyscraper Day". New York City developers competed among themselves, with successively taller buildings claiming the title of "world's tallest" in the 1920s and early 1930s, culminating with the completion of the 318.9 m (1,046 ft) Chrysler Building in 1930 and the 443.2 m (1,454 ft) Empire State Building in 1931,
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4000-419: Is to learn from previous failures. Thus, no engineer can be absolutely sure that a given structure will resist all loadings that could cause failure; instead, one can only have large enough margins of safety such that a failure is acceptably unlikely. When buildings do fail, engineers question whether the failure was due to some lack of foresight or due to some unknowable factor. The load a skyscraper experiences
4125-774: The Mallaig Extension Railway and the Glasgow Subway . There was an increasingly wide range of building and civil engineering contracts but the firm was almost brought to its knees again with the construction of the Methil Docks between 1909 and 1913. It was argued that this led to a much more cautious approach to risk on the part of the sons, if not the father. The inter-war period saw the firm focusing solely on construction. Gray wrote that Sir Robert McAlpine “seemed to have been involved in every major building and civil engineering project that ever hit
4250-643: The " Seven Sisters ", were built between 1947 and 1953; and one, the Main building of Moscow State University , was the tallest building in Europe for nearly four decades (1953–1990). Other skyscrapers in the style of Socialist Classicism were erected in East Germany ( Frankfurter Tor ), Poland ( PKiN ), Ukraine ( Hotel Moscow ), Latvia ( Academy of Sciences ), and other Eastern Bloc countries. Western European countries also began to permit taller skyscrapers during
4375-460: The 10th century described as resembling minarets . Nasir Khusraw in the early 11th century described some of them rising up to 14 stories, with roof gardens on the top floor complete with ox-drawn water wheels for irrigating them. Cairo in the 16th century had high-rise apartment buildings where the two lower floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants . An early example of
4500-465: The 1880s that had enabled construction of tall multi-story buildings. This definition was based on the steel skeleton—as opposed to constructions of load-bearing masonry , which passed their practical limit in 1891 with Chicago's Monadnock Building . What is the chief characteristic of the tall office building? It is lofty. It must be tall. The force and power of altitude must be in it, the glory and pride of exaltation must be in it. It must be every inch
4625-600: The 1960s now use a tube design derived from Khan's structural engineering principles, examples including the construction of the World Trade Center , Aon Center , Petronas Towers , Jin Mao Building , and most other supertall skyscrapers since the 1960s. The strong influence of tube structure design is also evident in the construction of the current tallest skyscraper, the Burj Khalifa , which uses
4750-603: The 1960s, according to the CTBUH, the skyscraper has been reoriented away from a symbol for North American corporate power to instead communicate a city or nation's place in the world. Skyscraper construction entered a three-decades-long era of stagnation in 1930 due to the Great Depression and then World War II . Shortly after the war ended, Russia began construction on a series of skyscrapers in Moscow . Seven, dubbed
4875-807: The 26th century BC. It was not surpassed in height for thousands of years, the 160 m (520 ft) Lincoln Cathedral having exceeded it in 1311–1549, before its central spire collapsed. The latter in turn was not surpassed until the 555-foot (169 m) Washington Monument in 1884. However, being uninhabited, none of these structures actually comply with the modern definition of a skyscraper. High-rise apartments flourished in classical antiquity . Ancient Roman insulae in imperial cities reached 10 and more stories. Beginning with Augustus (r. 30 BC-14 AD), several emperors attempted to establish limits of 20–25 m for multi-stories buildings, but were met with only limited success. Lower floors were typically occupied by shops or wealthy families, with
5000-690: The 57 m (187 ft) tall 1924 Marx House in Düsseldorf , the 65 m (213 ft) tall Borsigturm in Berlin , built in 1924, the 65 m (213 ft) tall Hansahochhaus in Cologne , Germany, built in 1925; the 61 m (200 ft) Kungstornen (Kings' Towers) in Stockholm , Sweden, which were built 1924–25; the 77 m (253 ft) Ullsteinhaus in Berlin, Germany, built in 1927;
5125-613: The 89 m (292 ft) Edificio Telefónica in Madrid , Spain, built in 1929; the 87.5 m (287 ft) Boerentoren in Antwerp, Belgium, built in 1932; the 66 m (217 ft) Prudential Building in Warsaw , Poland, built in 1934; and the 108 m (354 ft) Torre Piacentini in Genoa , Italy, built in 1940. After an early competition between New York City and Chicago for
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5250-566: The CTBUH, is the distance between the highest floor and its architectural top (excluding antennae, flagpole or other functional extensions). Vanity height first appeared in New York City skyscrapers as early as the 1920s and 1930s but supertall buildings have relied on such uninhabitable extensions for on average 30% of their height, raising potential definitional and sustainability issues. The current era of skyscrapers focuses on sustainability , its built and natural environments, including
5375-473: The Christmas celebrations of 1991. In 2009, the building was extended with Park Pavilion, a two-story glass structure built on the east side of the building, designed by César Pelli and Koetter Kim. The extension replaced the stainless steel columns, car parking spaces and road leading to Canada Square. The extension was made to create more retail space at street level, where five tenants were chosen to occupy
5500-861: The Consulting Association for some years before it became publicly implicated in a construction industry blacklisting scandal in 2009 and was wound up. Subsequently, Sir Robert McAlpine was one of eight businesses involved in the 2014 launch of the Construction Workers Compensation Scheme, though this was condemned as a "PR stunt" by the GMB union, and described by the Scottish Affairs Select Committee as "an act of bad faith". On 11 May 2016, major companies, including Sir Robert McAlpine, issued an "unreserved and sincere" apology in
5625-591: The Consulting Association, including Cullum McAlpine and David Cochrane, and against 12 major contractors including Sir Robert McAlpine. In May 2019, the Unite union secured a further £1.9m in compensation for 53 blacklisted workers. Seven construction businesses, including Sir Robert McAlpine, also agreed to pay £230,000 for a Unite training fund to help those affected by the vetting system, and paid Unite's legal fees. However, Unite assistant general secretary Howard Beckett said "the refusal of Cullum McAlpine to give evidence
5750-500: The Scottish village of Newarthill near Motherwell. From the age of seven he worked in the nearby coal mines, leaving at 16 to become an apprentice bricklayer. Later, working for an engineer, he progressed to being foreman before starting to work on his own account at the age of 22. He had no capital other than that he could earn himself and his first contract involving the employment of other men had to be financed by borrowing £11 from
5875-470: The United States and Europe define skyscrapers as buildings at least 150 m (490 ft) in height or taller, with " supertall " skyscrapers for buildings higher than 300 m (984 ft) and " megatall " skyscrapers for those taller than 600 m (1,969 ft). The tallest structure in ancient times was the 146 m (479 ft) Great Pyramid of Giza in ancient Egypt , built in
6000-521: The affected floor and how many remain. One Canada Square has a steel pendulum that serves as a tuned mass damper . The pendulum sways to offset movements in the building caused by strong gusts of wind. The building can sway 33.02 centimetres (13 inches) in the strongest winds. The lobby is 36 feet (11 m) high, clad in 90,000 square feet (8,000 m) Italian Rosso Levanto and Verde Imperial Guatemalan marbles imported from Italy, Guatemala and Turkey . The marble clad under steel ceilings gives
6125-408: The airport approach. To comply with air traffic safety regulations, the architects took five floors off the tower. The final height of 824 feet (251 m) was permitted, otherwise, the developers would have had to dismantle what was necessary to fit the height restriction. After losing five floors, Olympia & York insisted the other floors had to make up the lost floor space by increasing mass to
6250-497: The amount of material that must be supported. This becomes inefficient and uneconomic for buildings above 40 stories tall as usable floor spaces are reduced for supporting column and due to more usage of steel. A new structural system of framed tubes was developed by Fazlur Rahman Khan in 1963. The framed tube structure is defined as "a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form
6375-406: The architects first wanted to use aluminium for its low density, before insisting on steel to reflect Britain's heritage as an industrial nation . The final steel clad chosen was Patten Hyclad Cambric-finish stainless-steel. Commenting on the reason for choosing steel for the clad: "We studied the cladding material carefully and chose stainless steel with a linen finish because it seemed to fit
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#17327732454786500-415: The atmosphere of London." One Canada Square was originally designed to be 864 feet (263 m) high at 55 storeys, but that penetrated the permitted projection height of the flight obstruction area of the airport approach district to London City Airport , but this was extended to a height of 30 feet (9.1 m) above kerb level in consideration of the fact that One Canada Square was on the external zone of
6625-416: The building are inductive fluorescent lamps that can be colour rendered and dimmed. The floodlights use compact fluorescent lamps used to provide controlled lighting at the base of the tower. The lighting control system has photocells that will automatically switch on the display when it is dark. The tower also has a synchronised building exterior decorative light and laser multimedia display. The technology
6750-532: The building to passing aircraft. The pyramid is metal louvres that are self-cleaning with rainwater. Architect César Pelli commented on his pyramid design: "The pyramidal form makes a three-dimensional building of what would otherwise be just folded planes. It also strengthens the Axis Mundi , the vertical line that goes through skyscrapers and connects Heaven with Earth. This connection has been recognised in many cultures for several centuries now." Water
6875-504: The building's energy efficiency plans. The tower uses super-insulated windows at triple-pane glazing (with a high solar heat-gain coefficient), low-emissivity (low-e) coatings to prevent heat loss in winter months, UV coatings, scratch resistant outer layers, sealed argon / krypton gas filled inter-pane voids, 'warm edge' insulating glass spacers, air-seals and specially developed thermally designed window frames. The windows were manufactured with high R-values [low U-values, 0.90 W/(m.K)] for
7000-413: The building. All tenant passenger lifts serve the ground floor and the following groups of floors – floors 5–17, floors 18–28, floors 28–39 and floors 39–50 (note that level 5 is the first office floor and there is no level 13). In addition there are 2 firemen's lifts which serve all floors in the building. These have colour designations with blue being in the northeast core of the building and green being in
7125-500: The building. On certain floors, the instructions ask employees to leave the floor. Exit signs flash. The access control system unlocks doors as necessary. Fire dampers open. Throughout the building, cameras turn on and look for problems that intelligent video software applications have been programmed to detect. Within 2 minutes, the access control system sends a memo to the Security Director itemising how many people have left
7250-430: The butcher. From there, McAlpine enjoyed rapid success; the early contracts centred on his own trade of bricklaying and by 1874 he was the owner of two brickyards and an employer of 1,000 men. It was on one of the housing estates he built that he first experimented with using concrete blocks as well as bricks (from which he earned the nickname 'Concrete Bob'). With the capital he had acquired, McAlpine determined to build
7375-424: The classical designs of the early skyscrapers , instead embracing the uniform international style ; many older skyscrapers were redesigned to suit contemporary tastes or even demolished—such as New York's Singer Building , once the world's tallest skyscraper. German -American architect Ludwig Mies van der Rohe became one of the world's most renowned architects in the second half of the 20th century. He conceived
7500-645: The company have included: Sir Robert McAlpine is also involved in HS2 lot C1, working as part of joint venture, due to complete in 2031. Sir Robert McAlpine funded the initial establishment of the Consulting Association in 1993, providing £20,000, around half of which was used to buy a blacklist database from the Economic League and hire one of its former employees, Ian Kerr, as manager. Company director Cullum McAlpine served as chairman of
7625-481: The construction business and to protect it, Robert took his clerk into partnership, trading under the name McAlpine & Co; the clerk was bought out not long after. McAlpine’s first large contract was a building for the Singer Manufacturing Company in 1883 and the profit from that enabled him to pay off his remaining debts. Almost immediately he faced further financial difficulties. Winning
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#17327732454787750-630: The course of justice. In September 2017, McAlpine chief executive Paul Hamer tried to disassociate the company from continuing allegations of blacklisting in the construction industry, saying "Sir Robert McAlpine complies fully with all legislation to prevent blacklisting and is committed to fair and transparent recruitment. ... We have a zero tolerance policy towards blacklisting, illegal or unfair recruitment practices." The company defended itself again in December 2017 when Unite announced it had issued High Court proceedings against four former chairmen of
7875-648: The creation of a significant number of early skyscrapers, though none of these were steel reinforced and few remain today. Height limits and fire restrictions were later introduced. In the late 1800s, London builders found building heights limited due to issues with existing buildings. High-rise development in London is restricted at certain sites if it would obstruct protected views of St Paul's Cathedral and other historic buildings. This policy, 'St Paul's Heights', has officially been in operation since 1927. Concerns about aesthetics and fire safety had likewise hampered
8000-651: The development of skyscrapers across continental Europe for the first half of the 20th century. By 1940, there were around 100 high-rise buildings in Europe ( List of early skyscrapers ). Some examples of these are the 43 m (141 ft) tall 1898 Witte Huis (White House) in Rotterdam ; the 51.5 m (169 ft) tall PAST Building (1906–1908) in Warsaw ; the Royal Liver Building in Liverpool, completed in 1911 and 90 m (300 ft) high;
8125-497: The distinguished audience that the tower can become a "national recognised landmark". In August 1991, One Canada Square was completed and open for business. His Royal Highness The Duke of Edinburgh officially opened One Canada Square on the morning of 26 August 1991, and unveiled a commemorative plaque at the entrance to the building. Hundreds of construction workers attended the opening ceremony. The Duke of Edinburgh addressed some 800 invited guests, many of whom had been involved in
8250-402: The early 1960s Bangladeshi-American structural engineer Fazlur Rahman Khan , considered the "father of tubular designs " for high-rises, discovered that the dominating rigid steel frame structure was not the only system apt for tall buildings, marking a new era of skyscraper construction in terms of multiple structural systems . His central innovation in skyscraper design and construction
8375-416: The environment and loaded structures with decorative elements and extravagant finishes. This approach to design was opposed by Fazlur Khan and he considered the designs to be whimsical rather than rational. Moreover, he considered the work to be a waste of precious natural resources. Khan's work promoted structures integrated with architecture and the least use of material resulting in the smallest impact on
8500-454: The environment. The next era of skyscrapers will focus on the environment including performance of structures, types of material, construction practices, absolute minimal use of materials/natural resources, embodied energy within the structures, and more importantly, a holistically integrated building systems approach. Modern building practices regarding supertall structures have led to the study of "vanity height". Vanity height, according to
8625-420: The fire alarm activates on a floor, audio instructions tailored to each floor of the building sound. All floors will receive an evacuation message, with a controlled evacuation message replayed to each floor in order of priority. On floors below the source of the alarm a stand-by notification is given. Digital signage throughout the building displays alert messages followed by instructions tailored to each floor of
8750-528: The first building in the world to feature a metal-framed glass curtain wall , a design element which creates light, airy interiors and has since been used the world over as a defining feature of skyscrapers". Further developments led to what many individuals and organizations consider the world's first skyscraper, the ten-story Home Insurance Building in Chicago, built in 1884–1885. While its original height of 42.1 m (138 ft) does not even qualify as
8875-491: The framework above, rather than resting on load-bearing walls of conventional construction. Some early skyscrapers have a steel frame that enables the construction of load-bearing walls taller than of those made of reinforced concrete . Modern skyscraper walls are not load-bearing , and most skyscrapers are characterized by large surface areas of windows made possible by steel frames and curtain walls. However, skyscrapers can have curtain walls that mimic conventional walls with
9000-479: The glass façade skyscraper and, along with Norwegian Fred Severud , designed the Seagram Building in 1958, a skyscraper that is often regarded as the pinnacle of modernist high-rise architecture. Skyscraper construction surged throughout the 1960s. The impetus behind the upswing was a series of transformative innovations which made it possible for people to live and work in "cities in the sky". In
9125-606: The headlines of the day.” They included docks, harbours, power stations, factories; the Wembley Stadium and the Dorchester Hotel were notable examples. In the case of the Dorchester, when the client was unable to pay for the construction works, the company took possession of the completed building and operated it on its own account. In November 1934, Sir Robert died aged 87. Two weeks later his eldest son,
9250-650: The height, as well as the winds that interfere with their ropes, but they also need to inspect the steel roof. The pyramid roof lights up in the evenings and can be seen 20 miles (32 km) away. It is a permanent lighting of the One Canada Square pyramid using a thousand electronically controlled fluorescent tubes capable of sequence programming for special occasions and festive seasons. The 4000 lights are highly energy efficient, and have an annual running cost of £23,360, rather than £116,800 if traditional incandescent bulbs had been used. One Canada Square uses
9375-424: The high court to hundreds of workers for putting them on the illegal blacklist and denying them work over two decades. The companies agreed to pay sums ranging from £25,000 to £200,000 to 771 people under out-of-court settlements to avoid a trial, while accepting that "their secret vetting operation should never have happened". However, evidence disclosed before the settlement led many of the victims to claim that there
9500-473: The hundred-story John Hancock Center and the massive 442 m (1,450 ft) Willis Tower . Other pioneers of this field include Hal Iyengar , William LeMessurier , and Minoru Yamasaki , the architect of the World Trade Center . Many buildings designed in the 70s lacked a particular style and recalled ornamentation from earlier buildings designed before the 50s. These design plans ignored
9625-461: The impression of: "Rather than entering a corporate reception, you feel as if you're entering a hushed antespace of timeless power." In February 2017, security in the lobby was extended to include security screens to prevent unauthorised entry to the lifts. This was a follow-up to YouTuber Night Scape gaining unauthorised entry from the lobby to the roof. The tower has thirty two lifts for tenants to use, where 8 lifts serve roughly ten floors of
9750-593: The leadership team under CEO Paul Hamer. Edward McAlpine took over from Gavin McAlpine as chairman in January 2019. In the year to October 2022, the company had a turnover of £1.1bn with pre-tax profit of £9.3m. In 2023, Hamer reviewed the firm's structure and switched its focus to sectors rather than regions; the restructure was estimated to cost £8.4m and would result in annual savings of over £20m. However, Hamer did not see these savings realised – by February 2024, he
9875-454: The lower levels of a skyscraper will be much larger than the material required within higher levels. This is not always visually apparent. The Empire State Building 's setbacks are actually a result of the building code at the time ( 1916 Zoning Resolution ), and were not structurally required. On the other hand, John Hancock Center 's shape is uniquely the result of how it supports loads. Vertical supports can come in several types, among which
10000-674: The most common for skyscrapers can be categorized as steel frames, concrete cores, tube within tube design, and shear walls. The wind loading on a skyscraper is also considerable. In fact, the lateral wind load imposed on supertall structures is generally the governing factor in the structural design. Wind pressure increases with height, so for very tall buildings, the loads associated with wind are larger than dead or live loads. Other vertical and horizontal loading factors come from varied, unpredictable sources, such as earthquakes. By 1895, steel had replaced cast iron as skyscrapers' structural material. Its malleability allowed it to be formed into
10125-435: The most complex encountered given the balances required between economics , engineering , and construction management. One common feature of skyscrapers is a steel framework from which curtain walls are suspended, rather than load-bearing walls of conventional construction. Most skyscrapers have a steel frame that enables them to be built taller than typical load-bearing walls of reinforced concrete. Skyscrapers usually have
10250-419: The name "McAlpine". In 2008, Alfred McAlpine plc was acquired by Carillion and dismantled, thus making the "name war" irrelevant. In November 2017, the company announced 90 job losses in a cost-cutting drive following a loss-making energy from waste project. Six regional centres were to be cut to four. The company then announced a new board and leadership structure, with no McAlpine family members included in
10375-447: The new Sir Robert, also died. William was appointed Chairman while Alfred remained in charge of the operation in the north-west subsidiary, where he had been since 1918. The two London partners argued that the recession was impacting more on the north than the south and proposed closing Alfred’s company. Alfred, however, did not wish to return to London and, on an informal basis at first, the two businesses were run separately. The separation
10500-684: The new goods lift GL37). There is currently no public observation floor. However, there was an exception from 12 October 1992 to 15 December 1992, when bankruptcy administrators for Olympia & York Canary Wharf Limited opened the 50th floor to the public, to maintain interest in Canary Wharf. The scheme was stopped on 15 December 1992 when the IRA attempted to bomb the tower (see Terrorism section). The international BREEAM standard has awarded One Canada Square for best practice in sustainable design and environmental performance for buildings. To achieve
10625-406: The performance of structures, types of materials, construction practices, absolute minimal use of materials and natural resources, energy within the structure, and a holistically integrated building systems approach. LEED is a current green building standard. Architecturally, with the movements of Postmodernism , New Urbanism and New Classical Architecture , that established since the 1980s,
10750-728: The price of steel decreased and labor costs increased. The steel frames become inefficient and uneconomic for supertall buildings as usable floor space is reduced for progressively larger supporting columns. Since about 1960, tubular designs have been used for high rises. This reduces the usage of material (more efficient in economic terms – Willis Tower uses a third less steel than the Empire State Building) yet allows greater height. It allows fewer interior columns, and so creates more usable floor space. It further enables buildings to take on various shapes. Elevators are characteristic to skyscrapers. In 1852 Elisha Otis introduced
10875-401: The project. He spoke of the "large, airy space and clean, efficient office layout", as he declared the building ready for business. The attendees heard a specially-commissioned piece of music performed by a 30-strong choir. Paul Reichmann, Chairman of Olympia & York said: "The Canary Wharf Tower marks the start of a new beginning for Canary Wharf, for London, and for the United Kingdom. It
11000-454: The pyramid roof was put in place by crane. The celebration was attended by many famous architects, recognised engineers and political leaders. Amongst them were César Pelli, Brian Mulroney , Peter Rice , Man-Chung Tang , and Margaret Thatcher . Paul Reichmann , the owner of Olympia & York gave credit to Pelli for his building design as "this inauguration symbolises the spirit with which buildings can be achieved". Margaret Thatcher told
11125-424: The rating, the building had to meet or exceed a challenging score of 85% against strict criteria, and included environmental innovations such as the use of 80% recycled aggregate within the concrete used, and the recycling of waste heat to cool and warm the building. Aggregates used in the office build were from predominantly recycled sources, part of a strategy to integrate sustainable products and materials throughout
11250-408: The realities of life on the building site for many Irish expatriates. The company is also mentioned in other songs, such as "Building Up and Tearing England Down," also written by Behan, though historian Ultan Cowley has suggested that the relationship between Irish labour and senior management at Sir Robert McAlpine was more collaborative than what is related in these songs. Until 2023, the company
11375-418: The remaining floor space which created a tower that was not as slim as Pelli desired. Pelli and the other architects proposed alternatives, such as building more floors below ground and creating an extension of the tower into Docklands Square, which were similar ideas based upon previous Olympia & York buildings, though the ideas were rejected as it did not fit the basis of prime office space. The design of
11500-430: The roof, both of these machines for cleaning the windows are supported by rails that run around the outside of the pyramid roof and that are bolted down into the maintenance floor itself. The aircraft warning light is at the very top of the pyramid. Access is via a ladder with a warning sign stating that unauthorised entry will lead to dismissal. The tower uses an omni-directional light usual for marking hazards. It has
11625-440: The roof. The steel comprises a galvanised steel core, with a multi-layered protective coating and granular finish for better performance characteristics. The tile is in three satin finishes and a high-gloss silver and can be transported in situ in a building's roof. The pyramid itself is cleaned by special maintenance personnel who abseil from the light beacon opening at the very top of the roof. Not only do they have to deal with
11750-484: The safety elevator at the E. V. Haughwout Building in New York City, allowing convenient and safe transport to buildings' upper floors. Otis later introduced the first commercial passenger elevators to the Equitable Life Building in 1870, considered by some architectural historians to be the first skyscraper. Another crucial development was the use of a steel frame instead of stone or brick, otherwise
11875-643: The safety elevator, allowing convenient and safe passenger movement to upper floors. Another crucial development was the use of a steel frame instead of stone or brick, otherwise the walls on the lower floors on a tall building would be too thick to be practical. Today major manufacturers of elevators include Otis , ThyssenKrupp , Schindler , and KONE . Advances in construction techniques have allowed skyscrapers to narrow in width, while increasing in height. Some of these new techniques include mass dampers to reduce vibrations and swaying, and gaps to allow air to pass through, reducing wind shear. Good structural design
12000-497: The signs of London Docklands. The slate used here and in various places around the foyer on site is made from the Welsh slate shelving used in the repositories of the original Banana Warehouse at Canary Wharf. Skyscraper A skyscraper is a tall continuously habitable building having multiple floors. Modern sources define skyscrapers as being at least 100 meters (330 ft) or 150 meters (490 ft) in height, though there
12125-411: The site, delivering both affordable and sustainable environmentally friendly features to the building. One Canada Square energy performance has improved by decreasing 30% from 2007 to 2016 by initiatives such as installing LEDs and upgrading HVAC and water services. The ground floor, foyer area and basement levels of One Canada Square are open to the general public, having an underground retail area and
12250-402: The southwest. From the building's initial construction until late 2009 there were 2 large freight lifts at which point another was added. This lift was built inside a vacant lift shaft and has the designation GL37 (GL for goods lift and 37 as it is the 37th lift in the building). The tower uses 'Gearless Traction Elevators' by Otis. These lifts were installed in 1990 (aside from GL37 – 2009) using
12375-460: The space: four restaurants and Lloyds Bank. The extension's roof terrace is open to diners and contains a green roof having sedum moss. The name given to the building by the developers is 'One Canada Square', but it is often incorrectly called 'Canary Wharf Tower' or simply 'Canary Wharf'. The Civil Aviation Authority shows the building at 235 metres (771 ft) above ground level, or 245.8 metres (806 ft) above sea level. The pyramid roof
12500-405: The time, thereby the thermal resistance is one of the highest rated in the world for the entire window including the frame. The tower uses low energy consumption external lighting through intelligent lighting controls systems. This computer controlled system generates the visually interesting lighting displays on the exterior of the building. The uplighters that are usually seen on the exterior of
12625-438: The title for six years. The design and construction of skyscrapers involves creating safe, habitable spaces in very tall buildings. The buildings must support their weight, resist wind and earthquakes, and protect occupants from fire. Yet they must also be conveniently accessible, even on the upper floors, and provide utilities and a comfortable climate for the occupants. The problems posed in skyscraper design are considered among
12750-406: The tower received a fair share of criticism. According to César Pelli, the most damaging criticism came from Prince Charles , who said on national television, "I personally would go mad if I had to work in a place like that". Other criticisms came from former Prime Minister Margaret Thatcher, who said that the building was "not quite stunning". Construction on the tower began in 1988. Construction
12875-399: The tower with a similar shape to 200 Vesey Street (formerly Three World Financial Center), New York City, which was also developed by Olympia & York and designed by Argentine architect César Pelli . The shape was also made reminiscent of " Big Ben ". Olympia & York wanted to clad One Canada Square in stone , just like Peli's World Financial Center towers constructed in 1986 , but
13000-715: The tube frame must be interrupted, with transfer girders used to maintain structural integrity. Tube structures cut down costs, at the same time allowing buildings to reach greater heights. Concrete tube-frame construction was first used in the DeWitt-Chestnut Apartment Building , completed in Chicago in 1963, and soon after in the John Hancock Center and World Trade Center . The tubular systems are fundamental to tall building design. Most buildings over 40 stories constructed since
13125-482: The tube structure was the Chestnut De-Witt apartment building, considered to be a major development in modern architecture. These new designs opened an economic door for contractors, engineers, architects, and investors, providing vast amounts of real estate space on minimal plots of land. Over the next fifteen years, many towers were built by Fazlur Rahman Khan and the " Second Chicago School ", including
13250-478: The upper rented to the lower classes. Surviving Oxyrhynchus Papyri indicate that seven-stories buildings existed in provincial towns such as in 3rd century AD Hermopolis in Roman Egypt . The skylines of many important medieval cities had large numbers of high-rise urban towers, built by the wealthy for defense and status. The residential Towers of 12th century Bologna numbered between 80 and 100 at
13375-421: The use of the family name and won. The dispute centred on Alfred McAlpine's intention to trade under the name "McAlpine". There was previously a long-standing agreement within the McAlpine family not to make such a change but, following the death of Alfred McAlpine and his son, the board of Alfred McAlpine sought to make the change in any event. The effect of the judgment was to prevent Alfred McAlpine trading under
13500-465: The walls on the lower floors on a tall building would be too thick to be practical. An early development in this area was Oriel Chambers in Liverpool , England, built in 1864. It was only five floors high. The Royal Academy of Arts states, "critics at the time were horrified by its 'large agglomerations of protruding plate glass bubbles'. In fact, it was a precursor to Modernist architecture, being
13625-617: The weight of the building. This development led to the "Chicago skeleton" form of construction. In addition to the steel frame, the Home Insurance Building also utilized fireproofing, elevators, and electrical wiring, key elements in most skyscrapers today. Burnham and Root 's 45 m (148 ft) Rand McNally Building in Chicago, 1889, was the first all-steel framed skyscraper, while Louis Sullivan 's 41 m (135 ft) Wainwright Building in St. Louis, Missouri, 1891,
13750-814: The world have more than 100 skyscrapers that are 150 m (492 ft) or taller: Hong Kong with 552 skyscrapers; Shenzhen , China with 373 skyscrapers; New York City , US with 314 skyscrapers; Dubai , UAE with 252 skyscrapers; Guangzhou , China with 188 skyscrapers; Shanghai , China with 183 skyscrapers; Tokyo , Japan with 168 skyscrapers; Kuala Lumpur , Malaysia with 156 skyscrapers; Wuhan , China with 149 skyscrapers; Chongqing , China, with 144 skyscrapers; Chicago , US, with 137 skyscrapers; Chengdu , China with 117 skyscrapers; Jakarta , Indonesia , with 112 skyscrapers; Bangkok , Thailand , with 111 skyscrapers, and Mumbai , India with 102. As of 2024, there are over 7 thousand skyscrapers over 150 m (492 ft) in height worldwide. The term "skyscraper"
13875-664: The world's tallest building for forty years. The first completed 417 m (1,368 ft) tall World Trade Center tower became the world's tallest building in 1972. However, it was overtaken by the Sears Tower (now Willis Tower ) in Chicago within two years. The 442 m (1,450 ft) tall Sears Tower stood as the world's tallest building for 24 years, from 1974 until 1998, until it was edged out by 452 m (1,483 ft) Petronas Twin Towers in Kuala Lumpur, which held
14000-432: The world's tallest building, New York took the lead by 1895 with the completion of the 103 m (338 ft) tall American Surety Building , leaving New York with the title of the world's tallest building for many years. Modern skyscrapers are built with steel or reinforced concrete frameworks and curtain walls of glass or polished stone . They use mechanical equipment such as water pumps and elevators . Since
14125-476: The world, although only partially iron framed, is The Flaxmill in Shrewsbury , England. Built in 1797, it is seen as the "grandfather of skyscrapers", since its fireproof combination of cast iron columns and cast iron beams developed into the modern steel frame that made modern skyscrapers possible. In 2013 funding was confirmed to convert the derelict building into offices. In 1857, Elisha Otis introduced
14250-671: The years immediately following World War II. Early examples include Edificio España (Spain) and Torre Breda (Italy). From the 1930s onward, skyscrapers began to appear in various cities in East and Southeast Asia as well as in Latin America . Finally, they also began to be constructed in cities in Africa , the Middle East , South Asia , and Oceania from the late 1950s. Skyscraper projects after World War II typically rejected
14375-483: Was an illegal attempt by McAlpine executives to destroy evidence and cover up the involvement of key individuals when the blacklisting was discovered in 2009. The targets of the victims' intended criminal complaint included director Cullum McAlpine, and head of human resources, David Cochrane, who was a later chairman of the Association. Both denied involvement in destroying any relevant files and attempting to pervert
14500-475: Was developed by Australian firm Laservision and cost approximately £2 million. In the event of a fire, One Canada Square is not fully evacuated. The floor that has the fire and all other floors above are evacuated. The air conditioning is set to work in reverse to extract smoke and fresh air is blown into the fire escape staircases to increase air pressure and therefore slow the entry of smoke into these areas. The sprinkler system will not operate unless there
14625-621: Was first applied to buildings of steel-framed construction of at least 10 stories in the late 19th century, a result of public amazement at the tall buildings being built in major American cities like New York City , Philadelphia , Boston , Chicago , Detroit , and St. Louis . The first steel-frame skyscraper was the Home Insurance Building , originally 10 stories with a height of 42 m or 138 ft, in Chicago in 1885; two additional stories were added. Some point to Philadelphia's 10-story Jayne Building (1849–50) as
14750-708: Was formalised in 1940 and the northern business was renamed Sir Alfred McAlpine . During the Second World War Sir Robert McAlpine was one of the contractors engaged in building the Mulberry harbour units. The two McAlpine firms had non-compete arrangements and sites had a common “McAlpine” board irrespective of which firm it was. When both companies first went public, they did so under the names Newarthill for Robert and Marchwiel for Alfred. These arrangements continued until 1983. In 2003, Sir Robert McAlpine Ltd sued Alfred McAlpine plc over
14875-576: Was given to Sir Robert McAlpine & Sons in association with EllisDon of Toronto, but they were slow at building the tower, partly due to building workers going on strike in the summer of 1989, so Lehrer McGovern took over. Lehrer McGovern contracted out most of the work to Balfour Beatty because the Canary Wharf Tower was a difficult building to build. In total, about 27,500 metric tonnes of British steel and 500,000 bolts were used during construction. Construction also involved building
15000-424: Was in 17th-century Edinburgh , Scotland, where a defensive city wall defined the boundaries of the city. Due to the restricted land area available for development, the houses increased in height instead. Buildings of 11 stories were common, and there are records of buildings as high as 14 stories. Many of the stone-built structures can still be seen today in the old town of Edinburgh. The oldest iron framed building in
15125-650: Was on gardening leave with former Lendlease boss Neil Martin taking over as CEO on 19 February 2024. In July 2024, Sir Robert McAlpine reported a £110m operating loss in the year to October 2023, with revenue down 19% to £881m. From the 1930s onwards, the company employed large numbers of Irish immigrants who had come to England looking for work. The harsh working conditions with which McAlpine's management treated their labourers has gone down in Irish emigrant folklore. The song " McAlpine's Fusiliers " (written by Dominic Behan and made famous by The Dubliners ) described
15250-629: Was organised on a regional basis; following restructuring in late 2017, four regional centres were created: Scotland-Northern, Central-Wales-West, Southern and London. In 2020, the Wales business was merged into an expanded South region. In 2023, the company was restructured to focus on sectors rather than regions. Target markets included healthcare, commercial offices, industrial, heritage and complex schemes delivered by its Major & Special Projects team, and rail, transport and nuclear sectors delivered by its infrastructure business. Projects undertaken by
15375-454: Was the concept of the "tube" structural system , including the "framed tube", "trussed tube", and "bundled tube". His "tube concept", using all the exterior wall perimeter structure of a building to simulate a thin-walled tube, revolutionized tall building design. These systems allow greater economic efficiency, and also allow skyscrapers to take on various shapes, no longer needing to be rectangular and box-shaped. The first building to employ
15500-613: Was the first steel-framed building with soaring vertical bands to emphasize the height of the building and is therefore considered to be the first early skyscraper. In 1889, the Mole Antonelliana in Italy was 197 m (549 ft) tall. Most early skyscrapers emerged in the land-strapped areas of New York City and Chicago toward the end of the 19th century. A land boom in Melbourne , Australia between 1888 and 1891 spurred
15625-496: Was unable to fund the project, so the plans were sold to Olympia & York in 1987. Olympia & York grouped all three towers into an area known as Docklands Square, and the main tower was designated DS7 during planning. Docklands Square was later renamed Winston Square before finally being renamed as Canada Square . The architects chosen to design One Canada Square were César Pelli & Associates , Adamson Associates, and Frederick Gibberd Coombes & Partners. They designed
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