Double-layer steel sheet pile soil core composite cofferdam structure without inner support and application thereof

Abstract

The invention discloses a double-layer steel sheet pile soil core composite cofferdam structure without an inner support and the application of the double-layer steel sheet pile soil core composite cofferdam structure without an inner support, and belongs to the field of water conservancy projects. The double-layer steel sheet pile soil core composite cofferdam structure without an inner support comprises an upstream-face steel sheet pile and a downstream-face steel sheet pile, and the space between the steel sheet piles is filled with cohesive soil to form a cofferdam; a composite geo-membrane is laid on the portion, inside the cofferdam, of the upstream-face steel sheet pile; the upper portions of the two steel sheet piles are connected through a pull rod, middle beams are arranged outside the steel sheet piles, and the pull rod is connected with the middle beams through bolts arranged outside the corresponding middle beams. When the filling cofferdam core cohesive soil is in the same level with the pull rod, the space between the steel sheet piles is further filled with a layer of hairy residues, and a sub-cofferdam is arranged on the upstream-face steel sheet pile. The cofferdam structure can be used for building strip-shaped subsurface structures in a river or lake through the open-cut method. The cofferdam structure is stable and safe, and the problem that a steel sheet pile flexible structure is large in deformation is solved by arranging the pull rod on the tops of the two steel sheet piles; a three-level waterproofing system improves the anti-penetrability performance of the steel sheet pile cofferdam significantly.

Description

[0001] technical field [0002] The invention belongs to the field of water conservancy project construction, and relates to a composite cofferdam structure of double-layer steel sheet pile soil core without internal support and an application thereof. Background technique [0003] At present, steel sheet piles have a wide range of application examples in our country: steel sheet piles can be used in deep water wharfs, especially for dock walls and ship lock walls with impermeable requirements; in embankment projects, steel sheet piles can be used for anti-seepage walls The project is a semi-closed or fully closed anti-seepage system formed by steel sheet piles, a relatively impermeable layer under the permeable layer of the embankment foundation, a geomembrane, and an overlying soil layer; in deep foundation pit projects, steel sheet piles form enclosure walls, It has good soil retaining and anti-seepage properties, good integrity, and has the characteristics of high stren...

AI Technical Summary

Problems solved by technology

For this kind of flexible support structure that can undergo large deformation, the relationship between the steel sheet pile and the support system has a great influence on the deformation of the steel sheet pile, and even affects the stability of the cofferdam system, causing instability and damage

[0005] The traditional double-row steel sheet pile cofferdam is mostly used in bridge foundation pile foundation construction, because the plane of the cofferdam is small, and it usually forms a square or a circle, and the use of horizontal braces or diagonal braces between the steel sheet piles can effectively enhance the integrity of the steel sheet piles , but this method is not suitable for urban lake tunnel cofferdams

On the one hand, most of the cofferdams of urban lake tunnels are ultra-long, ultra-wide, and single-sided strip structures. The use of diagonal braces or cross braces between steel sheet piles cannot effectively ensure the long-term stability of steel sheet pile cofferdams, and the deformation of steel sheet piles is relatively large. ; On the other hand, the use of this steel sheet pile cofferdam structure has serious water seepage, which cannot meet the requirements of engineering construction

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