Concrete face rockfill dam leakage underwater blocking structure and method

Abstract

The invention discloses a concrete face rockfill dam leakage underwater blocking structure and method. The method is characterized by comprising the following steps that 1, underwater clogging material pouring is carried out, wherein a clogging material (3) is poured on a clearance opening (2) through a guide pipe (1), and the clogging material (3) is carried to the lower portion of a face plate (4) through permeation water flow; and 2, a grout pipe is pre-buried, wherein the pre-buried grout pipe (5) is a seamless steel floral pipe with the diameter not smaller than 2 cm, the length of the pre-buried grout pipe (5) penetrates the face plate to enter a padding layer (6) for the depth of 50 cm, a pentalobe grout hole (5.1) is formed in the side wall of the lower middle portion of the pre-buried grout pipe (5), and a valve (5.2) is arranged at the top of the pre-buried grout pipe (5) and guided to a water surface grout platform (5.4) through a grout hose (5.3). The defects that in the prior art, after leakage occurs, if leakage is not treated in time, fine materials in padding materials are constantly taken away by water flow, leakage is constantly deteriorated, and safety of a dam is threatened are overcome, and the beneficial effects of being convenient to construct, high in efficiency and capable of blocking a leakage channel within a short time are achieved.

Description

technical field [0001] The invention relates to the technical field of sealing of concrete face rockfill dams, and more specifically relates to an underwater sealing structure and method for seepage of concrete face rockfill dams. Background technique [0002] Dam seepage is the most common disease in hydraulic engineering. About 12.5% ​​of the 100m concrete face rockfill dams in my country have serious leakage. For example, the Hunan Baiyun face rockfill dam is 120m high and the maximum leakage is 1240L / s; the Zhushuqiao face dam is 78m high and the maximum leakage is 2500L / s. The causes of leakage in face rockfill dams are nothing more than damage to anti-seepage bodies such as face plates and water stops and foundation leakage, and the former accounts for the vast majority. For seepage control, the Baiyun face dam and the Zhushu bridge face are treated with empty reservoirs and dry land, which has achieved good results. However, emptying the reservoirs has a greater imp...

AI Technical Summary

Problems solved by technology

For seepage control, the Baiyun face dam and the Zhushu bridge face are treated by emptying the reservoir and dry land, which has achieved good results, but the emptying of the reservoir has a great impact on the benefits and the environment, and many face rockfill dams cannot empty the reservoir

The leakage caused by the damage of the face plate of the Sanbanxi face dam is treated underwater. After the damaged face plate is removed, the underwater PBM concrete is poured to restore the face plate. Because the deformation of the dam is still continuing and there is a new and old concrete interface in the underwater pouring concrete, it is extremely difficult to treat. , after three treatments, the leakage problem has not been completely solved

[0003] The damage to the face plate and water-stop structure of face rockfill dams often occurs when the water level is first stored to a high water level or after a period of operation at a high water level. Deterioration, threatening dam safety

However, most reservoirs undertake various functions such as flood control, water supply, and irrigation, and it is difficult to empty the reservoir in a short period of time or the water cannot be released during the flood season.

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