Diversion tunnel body gate wellbore temporarily sealing and blocking method and device

Abstract

The invention discloses a diversion tunnel body gate wellbore temporarily sealing and blocking method and device, which comprises a sealing and blocking steel plate arranged on a diversion tunnel gatewell wellbore, the outer end of the sealing and blocking steel plate is connected with diversion tunnel gate well wellbore concrete in a diversion tunnel sealing and blocking gate locking platform byanchor bolts, and rubber sealing is arranged at the joint; an air exhaust steel pipe is arranged in the upward direction of the sealing and blocking steel plate and extends to a lock chamber sectionconstruction branch tunnel, and a check valve is arranged in the position where the top of the air exhaust pipe reaches the lock chamber section construction branch tunnel. According to thediversiontunnel body gate wellbore temporarily sealing and blocking method and device,by sealing and blocking the tunnel body gate well wellbore andinterceptingapressure diversion tunnel gate well wellbore air inlet passage, leakage of the diversion tunnel is increased;the sealing and blocking wellbore prevents the high water head water from flowing through the wellbore to other downstream caverns;under theaction of the diversion tunnel high water head, the sealing and blocking device of the diversion tunnel body gate wellbore temporarily sealing and blocking method and device can be automatically vented to prevent the air of the lock chamber section from generating a gas explosion under high pressure; and at the same time, the air can be depressurized through the check valve, and the pressure on the outside and the inside of the steel plate is identical after the water is passed.

Description

technical field [0001] The invention belongs to a device for temporarily blocking a channel of a diversion tunnel to block a gate shaft in a hydropower project, and in particular relates to a method and a device for temporarily blocking a diversion tunnel body gate shaft. Background technique [0002] Due to the constraints of terrain and construction road conditions in water conservancy and hydropower projects, the diversion tunnel plugging gate wells are often arranged in the tunnel chamber. Since the gate shaft of the diversion tunnel is connected with the outside atmosphere, the pressurized flow head formed by the self-flow of this type of tunnel is higher than the value calculated by the conventional empirical formula. In order to reduce the inlet channel of the pressurized tunnel, increase the discharge capacity of the diversion tunnel, and reduce the water pouring downstream from the shaft section of the gate shaft when the diversion tunnel has high head flow, it is n...

AI Technical Summary

Problems solved by technology

At present, the existing technology usually uses a length of concrete plug to seal the construction branch hole connecting the wellbore and the outside world. This method mainly has the following problems: First, there is a section of air between the wellbore section and the concrete section where the plugging body is set. , under high head pressure, the risk of gas explosion is greater

Secondly, before the diversion tunnel is lowered, the plugging concrete needs to be removed by blasting, which is harmful to the structure around the wellbore and is time-consuming and labor-intensive.

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