Construction method and cofferdam of double-wall locking steel casing cofferdam without internal support

Abstract

The invention discloses an inner-support-free double-wall locking mouth steel bushing box cofferdam construction method and an inner-support-free double-wall locking mouth steel bushing box cofferdam. Firstly, unit blocks are processed in a factory and then transported to a construction region to be spliced and formed piece by piece, the spliced unit blocks are wholly hoisted to a target pier position at the preset elevation through a large hoisting ship, then construction steps of sludge suction, tenon type locking mouth plugging, sand cushion layer filling, concrete bottom sealing, water suction, foundation clearing, steel protection barrel cutting, pile head removing, whole abutment installation and the like are performed, finally whole dismantling is performed for usage of the next pier position construction. The inner-support-free double-wall locking mouth steel bushing box cofferdam comprises a side plate, a blade foot and a joint and is characterized in that the cofferdam is of a detachable structure, a plane is partitioned into blocks, the blocks are connected in a mode that tenon type locking mouths are combined with bolts, and the inner side is not provided with an inner support. Therefore, the inner-support-free double-wall locking mouth steel bushing box cofferdam has the advantages of being small in construction difficulty, short in construction period, low in cost input, small in material consumption, high in repeated usage times, capable of being wholly recycled, safe, reliable and the like.

Description

technical field [0001] The invention relates to a construction method for bridge engineering foundations, in particular to a double-layer bridge engineering foundation construction without internal support under the conditions of relatively large tidal range surge in shallow sea areas, thick flow plastic mud layer, and integral installation and construction of piers and abutments. The construction method and the cofferdam of the steel sleeve box cofferdam of the wall lock. Background technique [0002] In recent years, the construction of transportation infrastructure in coastal cities has developed rapidly, and bridge construction has gradually extended from bridges spanning rivers to super-large bridges flying across the ocean. However, there are many uncertainties in the underwater foundation construction of bridge construction in water, especially the foundation construction in marine areas, which is a major and difficult project. Therefore, choosing a reasonable constr...

AI Technical Summary

Problems solved by technology

[0004] 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 thicker plastic silt layer and the overall installation method of the piers are not conducive to the insertion and fixing of steel sheet piles; if a single-wall locking 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 recycling period is long; the double-wall steel cofferdam without inner support is completely used, which is not conducive to demolition and recycling, which not only wastes materials, but also costs a lot

Therefore, taking into account factors such as high quality, high efficiency, safety, simplicity, economy, and environmental protection, all currently constructed cofferdams are not the best choice

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