Construction method of deep water foundation pit cofferdam for large bridge foundation

Abstract

The invention discloses a construction method for a deep-water foundation pit cofferdam of a large-scale bridge foundation, which solves the problem that the weight of a double-wall steel cofferdam is too heavy and difficult to transport and install. The key point of the technical scheme is a construction method of deep water foundation pit cofferdam for large-scale bridge foundation, including the following steps: S1, prefabricated double-wall steel cofferdam; S2, cleaning the river bed; S3, installing lower cofferdam; S4, sinking lower cofferdam ; S5, install the upper cofferdam on the lower cofferdam, and weld the upper cofferdam and the lower cofferdam to form a double-wall steel cofferdam; S6, sink the double-wall steel cofferdam; S7, continue to sink the double-wall through the air suction dredge steel cofferdam; S8, clearing the foundation of the area enclosed by the double-wall steel cofferdam, and pouring concrete for the bottom cover; S9, pumping out the water in the area enclosed by the double-wall steel cofferdam; The weir construction method facilitates the construction of the cofferdam of the deep water foundation pit of the large foundation of the bridge.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a method for constructing a large-scale bridge foundation deep-water foundation pit cofferdam. Background technique [0002] Double-wall steel cofferdam is a commonly used cofferdam structure, which is widely used in the construction of large-scale foundation seepage pits of bridges. During the construction of bridges, double-wall steel cofferdams can prevent water and soil from entering the building Construction site for drainage, excavation of foundation pits and construction of buildings within the double wall steel cofferdam. [0003] Double-wall steel cofferdams are generally manufactured in blocks in the factory and assembled at the wharf. After the assembly is completed, the double-wall steel cofferdams are placed on the deck barge through the gantry crane of the wharf, and the deck barge is pulled by tugboats to make the double-wall steel cofferdams The wall ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: when carrying out the construction of the cofferdam of the large-scale foundation deep-water foundation pit of the bridge, because the depth of the large-scale foundation deep-water foundation pit is relatively deep, the height of the corresponding double-wall steel cofferdam is relatively high, that is, The weight of the corresponding double-wall steel cofferdam is relatively large, and it is difficult to hoist the above-mentioned double-wall steel cofferdam with ordinary floating cranes, which makes the construction of large-scale bridge foundation deep-water foundation pit cofferdam difficult.

Images