Ventilation hole and layout method after the diversion tunnel is rebuilt into arc gate control

Abstract

The invention discloses a ventilation hole and an arrangement method after diversion tunnels are rebuilt into arc gates and controlled, which includes setting a water inlet tower (1) upstream of the diversion tunnel (2) to be transformed, and Ventilation holes (1.1) are pre-set in the water inlet tower (1), and an inlet gradient section (3) is arranged between the water inlet tower (1) and the diversion tunnel (2) to be transformed. The ecological water discharge tunnel section (2.2) is divided into M and N two sections successively, and the M section is a concrete reconstruction body A (4) made by concrete pouring for the described ecological drainage tunnel section (2.2), and the concrete reconstruction body A(4) The bottom of A(4) is reserved to form a drainage channel (2.2.1); it overcomes the disadvantage that the lower gate will take away the air when the full flow is discharged, resulting in the formation of a negative pressure area behind the gate, which will damage the gate and other discharge facilities. , has the advantage of eliminating the adverse effect of negative pressure on the safety of arc doors and discharge 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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