The first coffer dam for construction of the piers was sunk in May 1918, and the old Aqueduct Bridge formally closed on July 9 . Immense amounts of concrete were needed to construct the bridge.
32.
This is because the area had recently received eight inches ( 200 mm ) of rain, which had caused a leak in the coffer dam that was keeping the construction site of the actual dam dry.
33.
By the end of the year, the intermediate gates of the staircase had been fitted, as had those on lock 4, and work on a coffer dam around the site of the tidal gate had been started.
34.
The initial stages of construction required building a coffer dam, preparing the foundations and injecting grout into the ground to create a watertight seal, building a drainage system, and excavating to create a solid base for building.
35.
The first coffer dam for construction of the piers was sunk in May 1918, and the old Aqueduct Bridge formally closed on July 9 . The new $ 2.35 million Key Bridge opened on January 17, 1923.
36.
As of Oct 2013, the Google Maps satellite view ( probably a year or more old ) shows the construction site, with a small coffer dam a bit upstream of the point where the permanent dam is being built.
37.
Heading the water resources agency from 1961 to 1967, he oversaw a major phase of the California Water Project that, once completed, produced a 444-mile network of aqueducts and coffer dams channeling water from Northern California to the Los Angeles area.
38.
June 2002 saw the coffer dam removed from around the rotating sector gate, and also saw the first vessel on the waterway, when a British Waterways maintenance boat passed from the Lancaster Canal into the connection basin above the staircase locks.
39.
This claim however is contested as a fatality took place during the construction of the coffer dams on September 18, 1939 . On July 27, 1940, the bridge opened for traffic and a 90 cent toll was charged on the Kingstown side.
40.
On 7 October 2013, there appeared to be a temporary coffer dam with filled sandbags across part of the river, immediately north of the point where the London Underground Picadiily Line ( and four conduits carrying unknown services ) crosses the river.
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