Highly effective quick-speed anti-seep plugging technology for cofferdam

Abstract

The invention discloses a cofferdam efficient swift anti-seepage and stopping leak technology, and it belongs to the water conservancy and hydroelectricity engineering technical area, the drilling hole whole hole uses pneumatic down-hole drilling eccentric pipe-following drilling, after the drilling is completed, grouting pipeline is installed, then the pipe-pulling machine pulls out annular tubes in hole, then the cementation is pressed into the hole through the grouting tail pipe (2) of grouting pipeline, after total drilling pressing and grouting are completed, the cofferdam efficient swift anti-seepage and stopping leak process is completed. The technology has been proved through the cofferdam construction practice in more 10 domestic power stations, the work of cofferdam anti-seepage and stopping leak can be completed in more 20 days to 2 months compared with 3 months under original condition, at the same time, the cofferdam in complex engineering ground layer condition or the failure cofferdam processed by ordinary processing technology can reach the designed effect in one time after processed by the technology, so the anti-seepage effect of the cofferdam processed by the technology is significant, and the effect not only is efficient and fast, also is economical. The promotion and the application of the technology also can solve the anti-seepage and stopping leak problems in dangerous reservoirs and rivers anti-flood, the invention has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and relates to soil and underground anti-seepage and plugging technologies, in particular to efficient and rapid anti-seepage and plugging technologies for cofferdams in temporary construction projects. Background technique [0002] In water conservancy (river) and hydropower construction projects, the anti-seepage and air-tightness of the cofferdam, as a necessary procedure before the construction of the main project, has an irreplaceable role. Therefore, many new technologies have been born in the treatment of cofferdam anti-seepage and plugging. , Different cofferdams and different regions, the cofferdam seepage prevention and plugging technologies adopted by each project are not the same. The cofferdam is a controlling process project in the construction of the main project. Whether the construction of the cofferdam can be completed on schedule will not on...

AI Technical Summary

Problems solved by technology

[0005] In the construction of hydropower stations, conventional grouting or double-liquid grouting construction methods are often used for plugging of cofferdam buildings. The general construction period is more than three months. Moreover, the grout control of cofferdam grouting in the past is generally achieved by mixing quick-setting chemical materials. In the construction, the grout is mixed with accelerating materials or double-liquid grouting. As a result, the grout diffusion radius is often insufficient, and there is a phenomenon of leakage between the two grouting holes, which leads to the failure of the cofferdam seepage control

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