Double-wall locking steel casing cofferdam and its construction method

Abstract

The invention discloses a double-wall opening-sealed steel sleeve box cofferdam and a construction method and relates to the field of bridge engineering foundation construction. The method comprises the steps that A, inner top-layer supports, inner bottom-layer supports, connecting systems, a plurality of cofferdam side plates and water stopping opening-sealed piles are conveyed to the position of a target pier, and the two sides of the cofferdam side plates are connected with first steel tubes and second steel tubes in a welded mode respectively; B, a platform is installed on steel protection casings, the inner top-layer supports, the connecting systems and the inner bottom-layer supports are connected into an overall inner support on the platform, and the overall inner support is placed downwards to a designed position; C, the cofferdam side plates and the water stopping opening-sealed piles are placed downwards, and the cofferdam side plates are connected into a whole through the water stopping opening-sealed piles; D, opening-sealing concrete is poured into the cofferdam; and E, the first steel tubes and the second steel tubes are filled with concrete. According to the double-wall opening-sealed steel sleeve box cofferdam and the construction method, construction of the double-wall opening-sealed steel sleeve box cofferdam can be conducted in the environment with high water flowing speed, severe scouring and complex geological conditions; the number of used inner supports can be reduced; disassembly and alternative usage can be achieved easily; the materials can be better saved, and the input cost is reduced.

Description

technical field [0001] The invention relates to the field of bridge engineering foundation construction, in particular to a cofferdam of a double-wall locking steel sleeve box and a construction method. Background technique [0002] In recent years, with the rapid development of my country's economy and society, the scale of infrastructure construction has continued to increase, and bridge construction has changed with each passing day. Bridges across rivers, lakes and seas have ushered in a construction climax. [0003] The construction of bridges across rivers, lakes and seas is extremely difficult due to the influence of hydrogeological conditions. Utilizing existing technology to build the foundation of bridges across rivers, lakes and seas requires large investment and high risks. Moreover, there are many uncertain factors in the underwater foundation construction of underwater bridge construction, especially the foundation construction in deep water areas, which is a ...

AI Technical Summary

Problems solved by technology

[0005] When the geological conditions are not complicated, steel sheet pile cofferdams, single-wall lock cofferdams and double-wall steel cofferdams are usually used for construction. The environment with complex geological conditions is not conducive to the insertion and fixing of steel sheet piles; if a single-wall lock cofferdam is used for construction, the cofferdam rigidity is not enough and a large number of internal supports must be welded, the process conversion is complicated and the construction and use period is long; The double-wall steel cofferdam is completely used, which is not conducive to dismantling and recycling, which not only wastes materials, but also costs a lot

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