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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.
State officials brought in ferries to temporarily carry cars across the Laguna Madre. Repair cost for the bridge was estimated US$5 million. I-40 bridge disaster: Webbers Falls, Oklahoma: United States 26 May 2002: Concrete bridge for vehicle traffic over Arkansas River: Barge struck one pier of the bridge causing a partial collapse 14 killed ...
Attempts have been made to increase the safety of bridges with pin and hanger assemblies by adding some form of redundancy to the assembly. Retrofits that add redundancy to pin and hanger assemblies include adding a "catcher's mitt"—a short steel beam attached to the bottom of the cantilevered girder that extends out beneath the suspended girder to "catch" the suspended girder should ...
Shear and Bending moment diagram for a simply supported beam with a concentrated load at mid-span. Shear force and bending moment diagrams are analytical tools used in conjunction with structural analysis to help perform structural design by determining the value of shear forces and bending moments at a given point of a structural element such as a beam.
The pier of a bridge is an intermediate support that holds the deck of the structure. It is a massive and permanent support, as opposed to the shoring , which is lighter and provides temporary support.
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USS ARD-1 under tow by USS Bridge 28 October 1934 USS Waterford (ARD-5) ARD-6 submerged at Dutch Harbor, Alaska with Sub USS S-46 for repair 1944. Auxiliary Repair Docks were built by Pacific Bridge Company in Alameda, California. ARD are 483 ft (147 m) long, have a beam of 71 ft (22 m), a draft of 5 ft (1.5 m), and a displacement of 4,800 tons.
A rail repair dutchman is typically a 4–6-inch (100–150 mm) long piece of rail that is cut in advance for the purpose and carried by a section crew. If the gang finds a rail with a chipped or broken end, they remove the connector plates ( fishplates ), cut out the damaged section, replace it with the dutchman, and bolt the connectors back ...