Method for composite geo-membrane sloping core cofferdam

Abstract

The invention discloses a method for a composite geo-membrane sloping core cofferdam. A buffer platform is reserved between an anti-seepage structure and a weir foot by moving a lower anti-seepage structure forwards, so that the synchronous construction of the lower anti-seepage structure and weir body filling is facilitated. A weir body comprises a weir body concrete extruding side wall, a weir body bedding material, a weir body transition material and a weir body rockfill material from upstream to downstream in sequence. The top of the lower anti-seepage structure is provided with anchoring concrete; the anchoring concrete is arranged after the weir top is filled to the top. The top and the bottom of a composite geo-membrane are provided with telescopic joints respectively and are anchored with the concrete at the weir top and the weir bottom respectively; the surface of the composite geo-membrane is protected by spraying the concrete. By using the method, conditions are created for parallel construction of the lower anti-seepage structure and the weir body filling, the weir body partition is simplified, the straight construction period is favorably shortened, the engineering construction progress is quickened, the engineering safety flood season is guaranteed, and the economic and social benefits are obvious.

Description

technical field [0001] The invention relates to a method for applying a composite geomembrane inclined wall cofferdam in water conservancy and hydropower projects, and belongs to the technical field of water conservancy and hydropower projects. Background technique [0002] In water conservancy and hydropower projects, in order to create dry construction conditions for dams, the river bed is cut off by means of interception, cofferdams are filled, and seepage prevention measures are taken to control seepage, so as to create dry construction conditions for dam foundation pits. Among the anti-seepage measures of cofferdams, composite geomembrane is widely used for cofferdam anti-seepage because of its low cost and convenient construction. The current technology is mainly based on composite geomembrane core wall cofferdam. [0003] Due to the particularity of water conservancy and hydropower projects, the cofferdam and its anti-seepage system must be completed in a dry season, ...

AI Technical Summary

Problems solved by technology

The core wall anti-seepage structure is adopted. After the closure, the lower anti-seepage structure, cofferdam filling and anti-seepage core wall construction become a linear construction period, that is, the upper cofferdam filling and anti-seepage can only be carried out after the construction of the lower anti-seepage structure is completed. The construction of the core wall leads to a long straight-line construction period, and it is difficult to complete the construction of the cofferdam and its anti-seepage system in a dry season

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