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A cofferdam on the Ohio River near Olmsted, Illinois, built for the purpose of constructing the Olmsted Lock and Dam A cofferdam during the construction of locks at the Montgomery Point Lock and Dam. A cofferdam is an enclosure built within a body of water to allow the enclosed area to be pumped out or drained. [1]
A cofferdam during the construction of locks at the Montgomery Point Lock and Dam A cofferdam is a barrier, usually temporary, constructed to exclude water from an area that is normally submerged. Made commonly of wood, concrete , or steel sheet piling , cofferdams are used to allow construction on the foundation of permanent dams, bridges, and ...
The Olmsted Locks and Dam is a locks and wicket dam on the Ohio River at river mile 964.4. The project is intended to reduce tow and barge delays by replacing the existing older, and frequently congested, locks and dams Number 52 and Number 53.
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.
A cofferdam is a small space left open between two bulkheads, to give protection from heat, fire, or collision. [2] Tankers generally have cofferdams forward and aft of the cargo tanks, and sometimes between individual tanks. [3] A pumproom houses all the pumps connected to a tanker's cargo lines. [1] Some larger tankers have two pumprooms. [1]
First, a cofferdam was constructed to seal the river from the water intake on the left bank of the Snoqualmie Falls. Steam-powered pneumatic drills were then used to excavate a vertical shaft from the intake to the cavern for Plant 1. A horizontal tunnel was dug as well, which met the vertical shaft at the cavern for Plant 1.
The cofferdams allowed workers to dry portions of the riverbed and begin constructing the dam, while water continued to flow down the center of the riverbed. [ 33 ] In August 1936 , once the west foundation was complete, portions of the west cofferdam were dismantled, allowing water to flow through part of the dam's new foundation.
On July 29, 2020, Electron Hydro, the company that owns and operates the dam, experienced an industrial accident in which crumb rubber debris was released into the Puyallup River. Astro-turf used as part of a cofferdam broke loose from the HDPE liner and was spilled into the river. The company took immediate action to rectify the spill. [6]