Method for steel sheet pile cofferdam construction in deepwater thick-sludge-layer environment

Abstract

The invention discloses a method for steel sheet pile cofferdam construction in a deepwater thick-sludge-layer environment. In construction, four guide steel pipe piles are inserted into the inner side of a supporting ring beam, first inner supports are placed on the guide steel pipe piles to serve as steel plate pile guide frames, the long and short steel sheet piles are inserted alternately andwelded to the first layer of inner supporting ring beam one by one, and building-in stability of a cofferdam in sludge can be improved by the aid of inner supporting auxiliary steel pipe piles and long steel sheet piles. After closure of the steel sheet pile cofferdam, steel pipe piles are inserted around the outer side of the cofferdam to realize supporting assistance. By a combined sludge suction pump and a telescopic boom grab bucket, sludge suction and dredging to bottom-sealing bottom elevation and pouring of underwater bottom sealing concrete can be realized, and the problem of low efficiency of a traditional air compressor reverse circulation sludge suction process under thick-sludge-layer geological conditions is solved. Plastic thin film strips are hung and filled in an outer sealing gap of the steel sheet pile cofferdam from top to bottom, the thin films are plugged into the sealing gap along with water flow under pressure difference resulted from pumping in the cofferdam, and accordingly water stop effects are achieved.

Description

technical field [0001] The invention relates to a cofferdam construction method, in particular to a steel sheet pile cofferdam construction method in deep water and thick mud layer environment. Background technique [0002] Nowadays, there are more and more bridges over water. In order to ensure the safety of navigation, more and more wading bridge foundations are buried under the river bed. For the geological conditions where the riverbed cover is dominated by deep and thick silt layers, the construction of super-long steel sheet piles is difficult due to the impact of the embedding depth of the cofferdam. Steel hanging boxes and locked steel pipe piles are often used as cofferdams in this special environment. The stability of the cofferdam is problematic, but the construction cost of the cofferdam of the steel hanging box and the locking steel pipe pile is high and the process is complicated. The present invention provides a steel sheet pile cofferdam construction method ...

AI Technical Summary

Problems solved by technology

[0003] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a steel sheet pile cofferdam construction method, which solves the technical problem of deep-water foundation construction under the geological conditions of thick silt layer; Pile, the first layer of internal support is placed on the guide steel pipe pile and serves as the steel sheet pile guide frame. Long steel sheet piles are used to improve the embedding stability of the cofferdam in silt geology; after the steel sheet pile cofferdam is closed, steel pipe piles are inserted around the

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