Steel sheet pile coefferdam structure and topdown construction method thereof

Abstract

The invention discloses a steel sheet pile coefferdam structure comprising a steel protecting canister, a plurality of layers of circuit purlins and steel sheet piles, wherein the steel sheet piles are inserted into the peripheries of the circuit purlins; the lower part of the steel protecting canister is welded with a bracket to form a temporary supporting platform; the circuit purlins at the upper layer and the circuit purlins at the lower layer are connected through a vertical rid and a bridging at 45 degrees; the top of the steel protecting canister is fixedly provided with an upper outrigger; the upper outrigger is provided with lifting equipment; and a lower outrigger is welded below the circuit purlins at the lowermost layer and lifted by a lifting rope of the lifting equipment. The invention also discloses a topdown construction method of the steel sheet pile coefferdam structure. In the invention, the circuit purlins, the vertical ribs and the bridging at 45 degrees are installed by utilizing a lifting system under the preconditions without using large-size lifting equipment or utilizing a large-scale prefabricating field, and therefore the quality and the stability of a steel sheet pile coefferdam are ensured; and a highrise pile cap of a pier inside water is constructed with lowest cost and smallest construction risk, therefore the feasibility and the economy of a construction technology of the steel sheet pile coefferdam inside water are enhanced.

Description

technical field [0001] The invention relates to a steel sheet pile cofferdam structure used in water and a reverse method construction method using the structure. The construction method can be applied to steel sheet pile cofferdam construction in the fields of road and municipal road and bridge engineering, water conservancy engineering and the like. Background technique [0002] At present, in the construction of roads and bridges, the construction of pile caps in the water of cross-river bridges can be divided into two categories: 1. The cofferdam cast-in-place construction method and the prefabricated installation method construction, wherein the vast majority of the water caps adopt cofferdams For cast-in-place construction, the cofferdams used are usually earth-rock cofferdams, reinforced concrete caisson cofferdams, steel jacket (hanging) box cofferdams, steel sheet pile cofferdams, etc. [0003] 1. The construction method of earth-rock cofferdam is often limited by w...

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Problems solved by technology

[0003] 1. The construction method of earth-rock cofferdam is often limited by water depth and construction site conditions, so the construction is difficult and the project cost is high;

[0004] 2. The construction method of the reinforced concrete caisson cofferdam, because the caisson is easy to sink, the selection of piles for the main structure engineering is limited, and the prefabrication, transportation and construction of the reinforced concrete caisson require a certain scale of prefabricated part site and comparative Large lifting equipment has the disadvantages of high project cost, long construction period and low work efficiency;

[0005] 3. The construction method of the steel box (hanging) box cofferdam. The prefabrication, transportation and construction of the steel box also require a certain scale of prefabricated parts and large lifting equipment. The amount of steel used is relatively large. After the construction is completed, most of the Steel is difficult to recycle, and the project cost is high;

[0006] 4. The construction method of the conventional steel sheet pile cofferdam, because the overall stability of the cofferdam is poor, the applicability is limited by the water depth, and the welding quality of the purlins and inner support components is not easy to guarantee, and the risk of cofferdam construction is relatively high

[0007] Based on the above situation, it is necessary to design a new cofferdam for pouring pile cap foundation construction in water. Difficult to recycle steel, and large-scale use of heavy lifting equipment, high construction cost and difficulty

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