5,208 articles
Turnkey
Turnkey, also known as a turnkey project or turnkey contract, is a delivery arrangement in which one contractor designs, builds, and commissions a facility for a lump sum, handing it over fully operational.
Turpan water system
The Turpan water system is a network of karez, underground gravity-fed channels carrying mountain groundwater to oasis fields in the Turpan Basin of Xinjiang, China, some at least 600 years old.
Turret
A turret is a small tower forming part of a larger building, first a castle defense and later a decorative feature of Queen Anne houses.
Tuttle Creek Dam
Tuttle Creek Dam is an embankment dam on the Big Blue River north of Manhattan, Kansas, built by the U.S. Army Corps of Engineers for flood control.
Twin Towers 2
Twin Towers II was a 2004 proposal by Kenneth Gardner and Herbert Belton to rebuild the World Trade Center towers, backed by Donald Trump but never built.
Tyne Bridge
The Tyne Bridge is a steel through-arch road bridge across the River Tyne between Newcastle upon Tyne and Gateshead, opened by King George V in 1928.
Tyne cyclist and pedestrian tunnels
The Tyne cyclist and pedestrian tunnels are two parallel tunnels beneath the River Tyne, linking Howdon with Jarrow, opened in 1951 as Britain's first built for both cyclists and pedestrians.
Tyntesfield
Tyntesfield is a Grade I listed Victorian Gothic Revival country house near Wraxall, North Somerset, rebuilt 1863-66 by John Norton for William Gibbs on Peruvian guano wealth, with a Blomfield chapel, and owned by the National Trust since 2002.
Types of concrete
Types of concrete are the distinct families of the composite building material made of cement, water, and aggregate, classified by density, reinforcement, workability, durability, and binder.
U Bein Bridge
U Bein Bridge, also called U Pain Bridge or Taungthaman Bridge, is a 1.2-kilometer wooden footbridge of teak crossing Taungthaman Lake near Amarapura, Myanmar, believed the world's oldest and longest teakwood bridge.
U.S. Bank Tower (Los Angeles)
U.S. Bank Tower, originally named Library Tower and later First Interstate Bank World Center, is a 1,018-foot skyscraper in downtown Los Angeles, the city's tallest until 2017.
UB City
UB City is a mixed-use complex of office towers, luxury retail, and serviced apartments on Vittal Mallya Road in central Bengaluru, India, developed by the UB Group and Prestige Group.
Ujjani Dam (उज्जनी धरण)
Ujjani Dam (उज्जनी धरण), also known as Bhima Dam, is a dam on the Bhima River in Solapur district, Maharashtra, India, completed in 1980 to irrigate drought-prone districts.
Ukai Dam
Ukai Dam, forming the Vallabh Sagar reservoir, is a multipurpose dam on the Tapi River in Gujarat, India, completed in 1972 for flood control, irrigation, and power.
Ultra-high-performance concrete
Ultra-high-performance concrete (UHPC) is a fiber-reinforced cementitious composite with compressive strength above 120 MPa and very low permeability. Developed as reactive powder concrete at Bouygues in 1993, it is used mostly in bridges.
Ultrapure water
Ultrapure water (UPW), known in labs as Milli-Q water, is water purified to remove ions, organics, particles, gases, and bacteria, defined by resistivity of 18.2 MΩ·cm and used mainly in semiconductor fabrication.
Ulugh Beg Observatory
The Ulugh Beg Observatory was a 15th-century astronomical observatory in Samarkand, built by the Timurid ruler Ulugh Beg and known for the 1437 Zij-i Sultani star catalog of 1,018 stars.
Umaid Bhawan Palace (उमैद भवन महल)
Umaid Bhawan Palace (उमैद भवन महल) is a 347-room royal residence on Chittar Hill in Jodhpur, India, built for Maharaja Umaid Singh from 1929 to 1943.
Umayyad Mosque (الجامع الأموي)
The Umayyad Mosque (الجامع الأموي), also called the Great Mosque of Damascus, is the congregational mosque of Damascus, built by caliph al-Walid I between 706 and 715.
Un-Dam the Klamath campaign
The Un-Dam the Klamath campaign was the effort by tribes, fishermen, conservationists, and irrigators to remove four Klamath River dams, culminating in the 2010 settlement and the largest dam removal completed to date in 2024.
Uncompahgre Project
The Uncompahgre Project, originally called the Gunnison Project, is a Bureau of Reclamation irrigation project in western Colorado authorized in 1903, one of the Reclamation Service's first five.
Underground city
An underground city is a network of pedestrian walkways, shops, and transit connections built below street level downtown, letting people move without going outdoors; Montreal's RÉSO and Toronto's PATH are the best-known examples.
Underground City, Montreal
The Underground City of Montreal, officially known as RÉSO, is an indoor pedestrian network of about 32 km of tunnels linking shops, offices, hotels, and metro stations downtown.
Underground irrigation canal
Underground irrigation canal, chiefly the Persian kārēz (کاریز) or qanat: a gravity-fed shaft-and-gallery aqueduct from Iran and Afghanistan irrigating about 1.5 million hectares, with regional names falaj, foggara, and karez.
Underground living
Underground living: dwelling in excavated or earth-sheltered spaces, from China's 7000-year silo-cave pit courtyards and Iran's Shavadan to modern earth-bermed houses, valued for thermal stability but challenged by moisture, ventilation, and health concerns.
Underground passages
Underground passages, Exeter: medieval stone-lined access tunnels and conduits in the city's water supply, dating from a 1226 conduit, scheduled monument NHLE 1003851 since 1935, partly open for guided tours.
Underpinning
Underpinning is a construction method that deepens a building's foundations by excavating soil beneath them and replacing it with concrete, done in phases to strengthen or deepen inadequate foundations.
Unfinished obelisk
The Unfinished Obelisk is a colossal granite obelisk still attached to bedrock in the ancient quarries at Aswan, Egypt, probably commissioned by Queen Hatshepsut for the temple of Amun at Karnak.
Uniclass
Uniclass is a unified classification system for all sectors of the UK construction industry, published by NBS; its current edition, Uniclass 2015, is designed for BIM.
Unified Soil Classification System
The Unified Soil Classification System (USCS) is an engineering soil classification, standardized as ASTM D2487, that assigns soils two-letter group symbols based on particle size and plasticity.