A construction method of combined steel sheet pile cofferdam in deep water

Abstract

The invention relates to the technical field of steel sheet pile cofferdam construction, in particular to a deep water combined steel sheet pile cofferdam construction method. The method comprises the steps that steel casings are inserted and driven into a cofferdam construction area; bearing structures are arranged in the positions, corresponding to enclosure purlin mounting positions, of steel sheet piles; the steel sheet piles are inserted and driven by relying on the steel casings to form a cofferdam structure in an encircling mode; enclosure purlins are sequentially hoisted onto the bearing structures on the inner sides of the steel sheet piles from bottom to top; water in the cofferdam is pumped layer by layer, and inner supports of the enclosure purlins are mounted layer by layer from top to bottom; and after all the inner supports are mounted, concrete is poured into the cofferdam to form a bearing platform structure. According to the method, corbels are arranged for the steel sheet piles in advance to realize in-place arrangement of the enclosure purlins in advance; through the construction method of conducting water pumping after bottom sealing, integral connecting of the enclosure purlins, and subsequent installation of the inner supports, adverse influences caused by existence of the steel casings, the upper-layer enclosure purlins and the inner supports on the operating space are avoided, the problem that large enclosure purlins cannot be installed is solved effectively, and the installation difficulty of the inner supports during the later period is lowered.

Description

technical field [0001] The invention relates to the technical field of steel sheet pile cofferdam construction, in particular to a deep-water composite steel sheet pile cofferdam construction method. Background technique [0002] Sheet pile cofferdams are usually composed of three major elements: sheet piles, purlins, and internal supports. The three elements work together to meet the environmental requirements for dry construction of deepwater caps. There are many supporting layers in the deep-water steel sheet pile cofferdam, which often leads to complex construction system conversion. To solve this problem, the commonly used construction methods of cofferdams in water include partial first branch method and full back branch method. Invention CN102926387A discloses a steel sheet pile cofferdam underwater purlin installation guide device and positioning method, that is, the partial first support method, using the steel casing to set the guide and lower the steel purlins la...

AI Technical Summary

Problems solved by technology

Part of the first support method has high requirements on the verticality of the casing, and at the same time requires large-scale lifting equipment such as floating cranes to cooperate with the installation, which is not suitable for lifting restricted waters, and the construction cost is high

The comprehensive rear support method, due to the influence of the casing and the upper purlin support, the space is narrow, and the inner support of the purlin needs to be scattered and layered for small block installation, which has the disadvantages of large processing volume, high continuous pumping power consumption, and slow progress.

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