Anti-seepage cofferdam structure and construction process

Abstract

The invention relates to anti-seepage cofferdam structure and a construction process. The cofferdam structure comprises a vertical anti-seepage body arranged in the middle of the end face of a cofferdam, wherein the bottom of the anti-seepage body extends to be embedded into a river bed covering layer, a main body of the anti-seepage body is formed by filling a multi-layer gel and sand gravel mixture, a vertical anti-seepage insulating layer is arranged on one side of the anti-seepage body and is a layer of geomembrane clamped between two geotextiles, a trapezoid cofferdam body is arranged on the other side of the anti-seepage insulating layer, and a lead wire gabion is arranged on the other side of the anti-seepage body. The construction process comprises using a backhoe excavator to remove large stones in a basic region after a temporary cofferdam is built; then using the backhoe excavator to dig a groove with 1.2m width and 3m depth along the cofferdam axis, and back filling the multi-layer gel and sand gravel mixture in layers to construct the anti-seepage cofferdam structure. The anti-seepage cofferdam structure is simple in structural style, the construction method is easy, and the anti-seepage effect is good. A construction period is shortened, fund is saved, and a simple and effective method is provided technically.

Description

technical field [0001] The invention relates to a cofferdam anti-seepage structure and anti-seepage construction technology using gelled sand and gravel mixture, geotextile and geomembrane on a deep overburden river bed. Background technique [0002] In the prior art, the stone cofferdam is a cofferdam filled with local materials. Local materials and excavation waste materials are fully utilized as cofferdam fillers. The structure is simple, the construction is convenient, easy to dismantle, and the project cost is low. A cofferdam form is widely used. However, the filling materials of the main earth-rock cofferdam basically have the problem of high permeability coefficient. Therefore, the research on anti-seepage has become a key issue in the development of earth-rock cofferdams. Throughout the development of earth-rock cofferdams, in the early 1950s, Italy and France began to use mud-solid wall drilling to build hydraulic cut-off walls on gravel foundations. From 1951 t...

AI Technical Summary

Problems solved by technology

[0004] Since most of the earth-rock cofferdams need to be constructed underwater, the materials cannot be effectively compacted, especially the anti-seepage material thrown underwater cannot guarantee the quality of the cofferdam’s anti-seepage

In addition, in order to meet the anti-seepage requirements of the earth-rock cofferdam, the anti-seepage section of the cofferdam cannot be too small, and the construction period of the cofferdam is usually very tight, and the cost should not be too high

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