Method for governing operating tunnel flood by adopting wellpoint dewatering method

Abstract

The invention relates to a method for governing operating tunnel flood by adopting a wellpoint dewatering method. A water collecting main pipe, water pumping equipment, a water level control device, a water discharge hose and a tunnel drainage ditch are adopted, the wellpoint dewatering method is adopted for reducing the underground water level in an operating tunnel, a plurality of wellpoint pipes are arranged at the bottoms of two liners in the operating tunnel, or a plurality of wellpoint pipes are arranged at the intersection points of the two liners arranged in the operating tunnel and a tunnel drainage ditch cover plate surface, the wellpoint pipes are arranged in a well hole drilled by an ordinary rock drilling machine through being matched with a phi 70mm drill bit in a downward direction forming a 30-degree included angle with the vertical direction, the bottoms of the wellpoint pipes need to be positioned in base rocks in positions being 1m under the bottom of the operating tunnel, the 2m positions of the lower ends of the wellpoint pipes are made into filter pipes, the filter pipes are in contact with the bottom of a well hole, the upper ends of the wellpoint pipes are communicated with the water collecting main pipe through a three-way valve, the water collecting main pipe is matched and connected with the water pumping equipment, the water pumping equipment is controlled by a starting box connected with the water level control device, and the wellpoint pipes, the water colling main pipe, the water pumping machine, the water level control device, the water discharge hose and the tunnel drainage ditch form a wellpoint dewatering pipeline system.

Description

technical field [0001] The invention relates to a flood control method for tunnels, in particular to a method for controlling floods in operating tunnels by adopting the well point dewatering method. Background technique [0002] At present, the well point dewatering method is a method often used in engineering construction to reduce the groundwater level of the construction site. It is generally used in the construction of earthworks, foundations, and foundation projects with relatively high groundwater levels. The well-point dewatering method often used in this kind of engineering construction is not used to control the floods that have occurred or will occur and possible floods. As far as the applicant knows, due to tunnel construction or design reasons, the operational tunnels and culverts will be affected by flooding, because flooding may cause a large amount of water seepage, which will seriously affect the normal operation of the operating tunnel. Usually, in the fac...

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Problems solved by technology

As far as the applicant knows, due to tunnel construction or design reasons, the operational tunnels and culverts will be affected by floods, because floods may cause a large amount of water seepage, which will seriously affect the normal operation of the operational tunnels

Usually, in the face of floods that occur in tunnel operations, the management department of tunnel operations does not have many ways to control floods, and the effect is not obvious

The traditional treatment methods are nothing more than water blocking measures such as drilling and grouting, or digging grooves in the secondary lining to install blind drainage pipes, and then lead the water out of the operating tunnel through the drainage ditch. The result of this is labor-intensive, time-consuming and inefficient. Low, and it is possible to block the existing drainage system of the tunnel due to grouting. Excavating a large number of dead pipes will damage the structure on the one hand and have very limited effect on the other hand.

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