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Shield machine components and systems
A shield machine is a tunnel boring machine whose cylindrical steel shield protects workers as it excavates a tunnel and erects its segmental lining in one operation.
Shield tunnelling incidents and failures
Shield tunnelling incidents and failures are the collapses, blowouts, and face-loss events during shield-machine excavation, including cases such as Singapore's Nicoll Highway collapse of 2004.
Shikun & Binui
Shikun & Binui (שיכון ובינוי, Hebrew for Housing and Construction) is an Israeli infrastructure and real estate group headquartered at Airport City, tracing to Solel Boneh in 1920 and active in about twenty countries.
Shing Mun Reservoir (城门水塘)
Shing Mun Reservoir, also known as Jubilee Reservoir (城门水塘), is an impounding reservoir in Hong Kong's New Territories, built from 1923 to 1937 to supply Kowloon.
Shiroro Dam
Shiroro Dam is a 600 MW hydroelectric dam on the Kaduna River at Shiroro Gorge in Niger State, Nigeria, commissioned in 1990 and one of the country's three major hydropower stations.
Shore Protection Manual
The Shore Protection Manual is a two-volume coastal engineering reference published by the U.S. Army Coastal Engineering Research Center, first issued in 1973 and last revised in 1984.
Shoring
Shoring is a temporary or permanent structural system used to support the sides of an excavation and prevent cave-in or collapse, commonly using soldier pile, sheet pile, and diaphragm walls.
Shotcrete
Shotcrete, also called gunite or sprayed concrete, is concrete projected at high velocity from a nozzle, used for tunnel support, slope stabilization, and repair work.
Shrine of Venus Cloacina
The Shrine of Venus Cloacina (Sacrum Cloacina) was a small circular shrine in the Roman Forum dedicated to the goddess of Rome's great sewer, the Cloaca Maxima.
Shushtar Historical Hydraulic System
The Shushtar Historical Hydraulic System is an ensemble of dams, canals, tunnels, and watermills on the Karun River at Shushtar, Iran, completed in the 3rd century CE.
Sichuan Road and Bridge Group
Sichuan Road and Bridge Group is a Chinese state-owned construction company headquartered in Chengdu, Sichuan, listed in Shanghai, one of China's largest road and bridge builders, with projects abroad.
Sight distance
Sight distance is the length of roadway ahead visible to a driver, measured along the line of sight; a controlling criterion of highway design with four AASHTO types: stopping, intersection, passing, and decision.
Sigma Plan
The Sigma Plan (Dutch: Sigmaplan) is a flood protection and nature restoration program of the Flemish government, launched in 1977 after the January 1976 storm surge floods along the tidal Scheldt in Belgium.
Silent Valley Reservoir
Silent Valley Reservoir is an impounding reservoir in the Mourne Mountains, County Down, Northern Ireland, built between 1923 and 1933 to supply water to Belfast.
Siloam tunnel
The Siloam tunnel, also called Hezekiah's tunnel, is a 533-meter rock-cut water tunnel in ancient Jerusalem, connecting the Gihon Spring to the Pool of Siloam.
Silver Bridge
The Silver Bridge, also called the Point Pleasant Bridge, carried US Route 35 over the Ohio River from 1928 until its 1967 collapse, which killed 46 people.
Silvertown Tunnel
The Silvertown Tunnel is a 1.4 km tolled twin-bore road tunnel under the Thames in east London, opened in April 2025 to relieve congestion at the nearby Blackwall Tunnel.
Simple suspension bridge
A simple suspension bridge is a bridge whose walkway lies on or between two sagging cables anchored at each end, without vertical suspenders, so it is restricted to pedestrians and suits difficult terrain.
Simplon Tunnel
The Simplon Tunnel is a 19.8 km twin-bore railway tunnel under the Alps linking Brig, Switzerland, with Iselle di Trasquera, Italy, opened in 1906 and long the world's longest.
Single-shield tunnel boring machine
A single-shield tunnel boring machine (single-shield TBM) is a hard-rock boring machine that thrusts against the segmental lining it erects, so boring and ring building alternate rather than overlap.
Sinking, joints and closure in immersed tube tunnels
Sinking, joints and closure in immersed tube tunnels covers how prefabricated tunnel elements are lowered onto the seabed, sealed with Gina and Omega gaskets, and closed at the final joint.
Siphon spillway
A siphon spillway is a closed conduit over a dam crest that passes flood water by siphonic action, with no moving parts and minimal rise in reservoir level.
Sir Leo Hielscher Bridges
The Sir Leo Hielscher Bridges, originally the Gateway Bridge, are twin toll bridges carrying the Gateway Motorway across the Brisbane River in Brisbane, Australia, the first opened in 1986.
Site amplification
Site amplification is the amplification of earthquake ground motion as a function of frequency, produced when the soil-rock column beneath a site filters incoming seismic waves.
Site C dam
The Site C dam, formally the John Horgan Dam, is a BC Hydro hydroelectric dam on the Peace River in northeast British Columbia, generating about 5,100 GWh yearly.
SK Engineering & Construction
SK Engineering & Construction (SK E&C, Korean: SK에코플랜트, now SK ecoplant) is a South Korean engineering and construction company in the SK Group, founded in 1977.
Skagit River Hydroelectric Project
The Skagit River Hydroelectric Project is a system of three dams, Gorge, Diablo, and Ross, on the upper Skagit River in Washington, owned by Seattle City Light.
Skye Bridge
The Skye Bridge, also called the Skye Road Bridge, is a road bridge opened in 1995 that carries the A87 from Kyle of Lochalsh to the Isle of Skye, toll-free since 2004.
Skyway
A skyway is an enclosed, elevated pedestrian walkway that connects buildings above street level, protecting walkers from weather; the first modern system opened in Minneapolis in 1962.
Slateford Aqueduct
The Slateford Aqueduct, also called Slateford viaduct, is an eight-arch masonry aqueduct in Edinburgh, built 1818–1822 to carry the Union Canal over the Water of Leith.