Search results
Results from the WOW.Com Content Network
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
The sides of the caisson are vertical, making a narrow rectangular box. Water ballast is used to control its buoyancy, as for the ship caisson, but the floating caisson is then hauled sideways into a recess built into the side of the dock wall. Rolling caissons are a development of sliding caissons fitted with rollers beneath.
The original name for DCS was "caisson disease". This term was introduced in the 19th century, when caissons under pressure were used to keep water from flooding large engineering excavations below the water table, such as bridge supports and tunnels. Workers spending time in high ambient pressure conditions are at risk when they return to the ...
The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower canal boats ...
A caisson is constructed of reinforced concrete and installed into sand or gravel below the surface level of an adjacent river or lake. [1] Screened conduits (also referred to as laterals or lateral well screens) are extended horizontally from ports in the caisson about 60 meters (200 feet) into surrounding water-bearing alluvium. [2]
They needed to sink caissons, rectangular bowl-like structures filled with pressurized air, all the way to the bedrock, as deep as 60 feet below the water. When they resurfaced, the workers would ...
A breakwater structure is designed to absorb the energy of the waves that hit it, either by using mass (e.g. with caissons), or by using a revetment slope (e.g. with rock or concrete armour units). In coastal engineering, a revetment is a land-backed structure whilst a breakwater is a sea-backed structure (i.e. water on both sides).
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!