Structure for preventing cracking and water leakage of concrete dam bank slope dam section

Abstract

The invention discloses a structure for preventing cracking and water leakage of a concrete dam bank slope dam section. The structure for preventing cracking and water leakage of the concrete dam bankslope dam section comprises a bank slope dam section dam body, a bank slope base rock, a bank slope slope base rock surface and a bank slope base rock plane. A first row of semi-circular permeable pipes and a second row of semi-circular permeable pipes are installed inside the bank slope dam section dam body and on the bank slope slope base rock surface. The first row of semi-circular permeable pipes and the second row of semi-circular permeable pipes are filled with clay. Semi-circular permeable drainage pipes along a slope direction are arranged on the bank slope slope base rock surface andare located inside the bank slope dam section dam body. Semi-circular permeable drainage pipes along a water flow direction are arranged on the bank slope slope base rock surface and are located inside the bank slope dam section dam body. The outsides of the semi-circular permeable drainage pipes along the slope and the semi-circular permeable drainage pipes along the water flow direction are wrapped with water permeable geotextile. The clay backfilled in the semi-circular permeable pipes can effectively prevent the occurrence of the water leakage of the dam body when the dam body shrinks andthe rock foundation is cracked. The construction is convenient, the investment is small, and the effect is good.

Description

technical field [0001] The invention relates to a structure for preventing water leakage from the cracking of the bank slope of a concrete dam. Background technique [0002] Concrete gravity dam bank slope dam section, firstly, because it is a rocky slope, a steeper slope, such as 1:0.3, is often used for construction and excavation; secondly, the height of the slope is often higher due to the steepness of the bank; The deformation modulus of the concrete in the slope dam section is different from that of the bank slope bedrock, and the shrinkage deformation is inconsistent under the influence of temperature stress and humidity. Due to the above three reasons, contact grouting is often carried out in the construction process of the bank slope section of the concrete gravity dam, that is, by burying the cooling water pipe, the temperature of the dam body is reduced to a stable temperature field by passing the cooling water. Because the concrete dam body is large, the amount o...

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Problems solved by technology

Due to the above three reasons, contact grouting is often carried out in the construction process of the bank slope section of the concrete gravity dam, that is, by burying the cooling water pipe, the temperature of the dam body is reduced to a stable temperature field by passing the cooling water. Because the concrete dam body is large, the amount of cement is large , the hydration heat temperature rises, and to reduce the temperature of the dam body to the temperature field, it is often necessary to pass water in the first phase, the second phase or even the third phase. There are many construction procedures, the construction process is cumbersome, and the quality is not guaranteed.

Although contact grouting has been carried out, there are still many projects in the actual project where cracks and water leakage occur at the junction of the bank slope dam section and the bedrock. The post-processing is very troublesome, labor-intensive, time-consuming and expensive, and the effect is not very good.

It brings inconvenience to the operation and management of the dam, and there is water leakage in the dam body, which poses a safety hazard

In engineering practice, there have been cracks in Hebei Taolinkou Dam, Panjiakou Dam, Xinjiang Chonghuer Dam, Longkou Dam, etc., resulting in water leakage from the dam body, so it is urgent to solve the above problems

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