Novel deep-water combined steel sheet pile cofferdam construction method

Abstract

The invention relates to the technical field of steel sheet pile cofferdam construction and particularly relates to a novel deep-water combined steel sheet pile cofferdam construction method. Steel casings are inserted and beaten in a cofferdam construction area, the parts, exposed out of water, of the steel casings are provided with bearing structures, a first layer of confining purlins are spliced by means of the bearing structures, a second layer of confining purlins are spliced by means of the first layer of confining purlins, and the confining purlins are spliced in sequence till all the confining purlins are connected into a whole structure; connection between the bearing structure and the steel casings is cut, and the confining purlins are lifted to the designed position as a whole and fixed to the steel casings; then, steel sheet piles are inserted and beaten with the confining purlins being guidance till a cofferdam is enclosed; and then, bearing platform structure construction is performed in the cofferdam. Block-by-block machining, transport and splicing are adopted for the confining purlins and an inner support, and the requirement for hoisting equipment is avoided; and meanwhile, the confining purlins are spliced into a whole on the site and then placed down, one-time water pumping in the confining purlins to the bottom sealing layer top is achieved, the installation processes of the confining purlins and the inner support are shortened, construction efficiency is improved, and the construction cost is lowered.

Description

technical field [0001] The invention relates to the technical field of steel sheet pile cofferdam construction, in particular to a novel 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 purl...

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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