Reconstructed ecological drainage tunnel structure combined with permanent plug and arrangement method thereof

Abstract

The invention relates to the technical field of water conservancy and hydropower engineering construction diversion and discloses a reconstructed ecological drainage tunnel structure combined with a permanent plug. The reconstructed ecological drainage tunnel structure combined with the permanent plug comprises a diversion tunnel and a permanent plug arranged in the diversion tunnel, an ecologicaldrainage hole is formed in the lower portion of the permanent plug, a reconstructed arc door lock chamber section and a reconstructed outlet diffusion section are arranged on the downstream side of the permanent plug, a grouting gallery is arranged at the position, above the ecological drainage hole, in the permanent plug, and the grouting gallery extends upwards to the upstream side of a dam main curtain line and extends downwards to the reconstructed arc door lock chamber section. The invention further discloses an arrangement method of the reconstructed ecological drainage tunnel structurecombined with the permanent plug. According to the reconstructed ecological drainage tunnel structure combined with the permanent plug and the arrangement method of the reconstructed ecological drainage tunnel structure, it is avoided that a diversion bottom hole is formed in the low-elevation portion of the high-arch dam body, meanwhile, downstream river ecology is maintained in the gate-lockingwater storage period of the diversion tunnel, the construction time is won for the permanent plug, the construction period can be shortened, and meanwhile project investment is saved.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering construction diversion, in particular to a reconstructed ecological water discharge tunnel structure combined with a permanent plug and an arrangement method thereof. Background technique [0002] In the construction of extra-high arch dams in alpine and canyon areas, the diversion method of cofferdams blocking the river bed and diversion tunnel discharge is usually used in the early stage of diversion construction, and the temporary diversion bottom hole of the dam body and the flood discharge tunnel on the bank are adopted in the later stage of diversion construction. Diversion method. After the lower gate of the diversion tunnel is blocked, the water level of the reservoir gradually rises. Before the water level reaches the elevation of the spillway hole of the super-high arch dam, the water flow has no discharge channel, which leads to the dehydration of th...

AI Technical Summary

Problems solved by technology

[0008] (1) The upper part of the super-high arch dam body is generally equipped with flood discharge surface holes and flood discharge middle holes (or deep holes), while the length of the arch dam body generally built in the narrow part of the river bed is limited, and then the diversion bottom is set on the dam body It is difficult to arrange opening and closing equipment such as gates and corresponding auxiliary structures;

[0009] (2) Arranging diversion bottom holes at the lower part of the ultra-high arch dam body, opening holes and arranging corresponding auxiliary structures, making the structure of the dam complex, which has a great impact on the stress distribution of the dam body, and is not conducive to the safety of the dam body;

[0010] (3) Affect the construction progress of the concrete pouring of the dam body. For the project where the dam construction is the key line, it will take 1 to 2 months for the straight-line construction period;

[0011] (4) The diversion bottom hole and its auxiliary structures and equipment require a large amount of engineering and high investment. The investment of a diversion bottom hole in an ultra-high arch dam over 200 meters in China is about 40 million to 50 million yuan, and the diversion bottom hole The operating time is short, and it is only used within 5 to 6 months after the diversion tunnel is closed, and the reservoir is impounded for 5 to 6 months, so the economy is poor; in addition, since the diversion bottom hole is set at a lower elevation of the dam body, part of the upper reaches of the dam needs to be removed The cofferdam has inflow conditions, and the engineering volume and investment will be increased accordingly

Under normal circumstances, the reconstruction of the ecological water discharge tunnel and the construction of the permanent plug of the diversion tunnel need to be completed in the same dry season. In the early stage of the dry season, the reconstruction of the ecological water discharge tunnel is carried out first. After the overflow of the ecological water discharge tunnel is completed, the original diversion tunnel is closed by gate , because the reconstruction of the ecological water discharge tunnel and arc door debugging requires a certain construction time, generally 3 to 4 months, the construction of the diversion tunnel to rebuild the ecological water discharge tunnel will directly occupy the construction time of the permanent plug of the diversion tunnel in the later stage, which may lead to permanent plugging in the later stage It is difficult to complete the construction in the same dry season

At the same time, the structure of the rebuilt plug in the reconstruction of the ecological water discharge tunnel is similar to the structure of the permanent plug of the diversion tunnel. The reconstruction of the plug and the ecological water discharge tunnel are set up separately, and the project investment is large and the economy is poor

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