Diversion tunnel plugging structure for initial water storage and rapid plugging method of diversion tunnel

Abstract

The invention discloses a rapid diversion tunnel plugging structure capable of shortening construction period. The rapid diversion tunnel plugging structure comprises a diversion tunnel and a plugging body, wherein the diversion tunnel comprises a straight tunnel section and a wedge body section; the plugging body comprises a temporary plug and a permanent plug; the temporary plug is positioned between the permanent plug and a water inlet of the diversion tunnel; and the permanent plug consists of an initial water storage plug positioned on the lower part and a normal water storage plug positioned on the upper part. The permanent plug is divided into the initial water storage plug and the normal water storage plug, so that the permanent plug can be constructed in two stages respectively, namely, initial water storage begins after the temporary plug and the initial water storage plug are constructed by pouring, during initial water storage, the normal water storage plug can be constructed by pouring, through the structure, initial water storage can be carried out in advance, the diversion tunnel is plugged rapidly under the condition of high water head, and initial power generation of a first unit of a hydropower station is implemented ahead of time.

Description

technical field [0001] The invention relates to a water conservancy and hydropower structure, especially a diversion tunnel plugging structure for initial water storage; in addition, the present invention also relates to a water conservancy and hydropower construction method, especially a method for quickly plugging diversion tunnels . Background technique [0002] When constructing high-dam giant hydropower projects in deep mountain and canyon areas, construction diversion usually adopts the method of cofferdam one-time interception + diversion tunnel discharge. In recent years, with the continuous improvement of the construction technology of high dam projects, the rising speed of the dam body has accelerated accordingly. Many projects have the construction image and appearance conditions for the water storage of the gate in advance. If the water storage is carried out in advance, the power generation will undoubtedly increase, and the obtained Huge economic and social be...

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Problems solved by technology

[0003] (1) The joint surface of the temporary plug and the permanent plug is affected by the temperature stress to produce a dry shrinkage effect, and there may be poor contact, which weakens the combined bearing effect of the temporary plug and the permanent plug, and increases the burden of high external water time risk

Therefore, the design of the permanent plug needs to be longer, which increases the project investment and prolongs the construction period

[0004] (2) Since the initial water storage needs to wait until the permanent plug is poured, the construction period is still long, which affects the power generation efficiency

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