Overhauling arrangement structure for permanent plug of high arch dam diversion tunnel

Abstract

The invention relates to an overhauling arrangement structure for a permanent plug of a high arch dam diversion channel, correspondingly relates to an overhauling method for the permanent plug of the high arch dam diversion channel and belongs to the technical field of diversion and closure construction in hydraulic and hydropower engineering. The overhauling arrangement structure includes a drainable blocking structure and an overhauling blocking structure. The drainable blocking structure is arranged at the position of an outlet of the diversion channel and includes a gallery, a vertical well platform, a draining vertical well and a water collecting well. The overhauling blocking structure is arranged in a construction adit and includes an overhauling channel and an overhauling water blocking gate. The overhauling method includes the steps that water flow in the diversion channel is completely extracted through the arranged draining vertical well, then the overhauling gate is opened through the overhauling channel so that entering the diversion channel can be achieved, and finally monitoring and overhauling of the permanent plug are achieved. According to the arrangement structure, monitoring and overhauling of the permanent plug of the diversion channel are facilitated, and the arrangement structure of safety running of a draining gallery of a plunge pool is not affected; and the structure is simple and reliable, safety is high, the investment is saved, and construction is convenient.

Description

technical field [0001] The invention relates to an inspection arrangement structure of a permanent plug in a diversion tunnel of a high arch dam, and correspondingly relates to a method for overhauling a permanent plug in a diversion tunnel of a high arch dam, belonging to the technical field of diversion and interception construction in water conservancy and hydropower projects. Background technique [0002] During the construction of high arch dams in deep mountain and canyon areas, the cofferdams are cut off throughout the year, and the diversion method of diversion tunnels is the most widely used construction diversion method. After these large diversion tunnels complete their missions, they all need It is sealed with a permanent concrete plug structure. After the plugging is completed, the permanent plug of the diversion tunnel and the anti-seepage curtain of the dam form a whole to play the role of anti-seepage of the dam body. Its level is consistent with that of the ...

AI Technical Summary

Problems solved by technology

[0004] (1) The outlet of the diversion tunnel is equipped with a shore tower lock chamber, which has a large project scale, high investment and high maintenance costs;

[0005] (2) The sluice chamber at the outlet of the diversion tunnel has been deposited by sediment for many years (this has happened in existing projects), so it is difficult to open the sluice, and the sluice has been placed underwater for a long time, which may cause damage and leakage;

[0006] (3) The diversion tunnel construction branch tunnel channel is often connected with the drainage corridor channel of the water cushion pond. In order to avoid the influence of the diversion tunnel plug or the water seepage of the diversion tunnel lining, ensure the normal operation and safety of the water cushion pond drainage corridor , it needs to pump water regularly, which is extremely cumbersome

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