Air vent with diversion tunnel reconstructed into arc-shaped gate control and arrangement method

Abstract

The invention discloses an air vent with a diversion tunnel reconstructed into arc-shaped gate control and an arrangement method. The air vent comprises a water inlet tower (1) which is arranged at the upstream of a to-be-modified diversion tunnel (2), wherein an air vent (1.1) is pre-arranged in the water inlet tower (1); an inlet gradual-changing section (3) is arranged between the water inlet tower (1) and the to-be-modified diversion tunnel (2); an ecological dewatering tunnel section (2.2) is sequentially divided into a section M and a section N, wherein the section M is a concrete reconstructed body A (4) which is formed by pouring concrete to the ecological dewatering tunnel section (2.2); and a water release channel (2.2.1) is reserved in the bottom of the concrete reconstructed body A (4). The air vent overcomes the defect that a gate and other drainage facilities are damaged by a negative pressure region behind the gate as air is taken away by outflow sluice during full-flow aerial drainage, and has the advantage of eliminating adverse effect of negative pressure to an arc gate and the leakage facilities.

Description

technical field [0001] The invention relates to the technical field of diversion in construction of water conservancy and hydropower projects, and more specifically relates to a ventilation hole and an arrangement method after diversion tunnels are rebuilt into arc-shaped gates for control. Background technique [0002] 1. At present, the setting of the ventilation hole of the flat door at the entrance of the diversion tunnel [0003] Since the diversion tunnel will take away the air when the diversion tunnel is full of discharge, it will form a negative pressure area behind the gate, which will damage the gate and other discharge facilities. The pre-buried pipe on the top leads directly to the operating platform at a higher position to form a ventilation hole. [0004] Since the vent hole is only used once when the gate of the diversion tunnel is closed, after the diversion tunnel is blocked and the water level exceeds the vent hole, the vent hole should be sealed with a s...

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Problems solved by technology

[0009] (2) When the ventilation tunnel (shaft) ventilation and flat pressure method is adopted, there will be construction interference problems during the reconstruction of the diversion tunnel, which will increase the straight line construction period and civil engineering volume of the reconstruction

[0010] (3) Most of the slope rock mass at the entrance of the diversion tunnel is a strong unloading zone after excavation. In order to stabilize the slope, deep anchor cables or anchor piles are mostly arranged in the early stage. If the ventilation tunnel ( Shaft) excavation construction has a great impact on the stabilized slope

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