Method for reinforcing concealed tunnel

Abstract

The invention discloses a method for reinforcing a concealed tunnel, which builds a pipe shed for the arch of the tunnel and reinforces the pipe shed by means of grout injection before tunneling. The method comprises the following steps of: setting up a work platform; installing a hollow opening pipe; hoisting and positioning a drilling machine; machining and forming a steel tube of the pipe shed; drilling and forming a hole in a self-advancing way; cleaning the hole, sealing a hole opening; stirring and preparing grout injecting liquid; filling the grout injecting liquid into the pipe shed; and subsequently operating. In the technical scheme of the method, a positioning plate is arranged at a hole opening section, a check valve is arranged in the steel tube of the pipe shed, and a self-advancing drill head is directly connected with the steel tube of the pipe shed in a welding way, so as to effectively heighten the construction precision of the pipe shed, well guarantee an injection effect, reduce the probability of hole caving due to the injecting and the filling are not immediately, simplify construction work procedures, height construction efficiency; and a grout injecting technology with several times is adopted, so as to guarantee the pressure of grout injection at 1.5MPa-2.0MPa, obviously heighten the injection quality of the pipe shed, and improve the advanced support effect of the pipe shed to the concealed tunnel.

Description

technical field [0001] The invention relates to the technical field of mechanical construction, in particular to a reinforcement method for a submerged tunnel used for shallow buried submerged excavation construction. Background technique [0002] During underground excavation tunnel construction, it is usually necessary to reinforce and advance support the vault area of ​​the tunnel, and to improve the formation of the tunnel face by grouting. At present, the commonly used method in this technical field is to build a long pipe shed and small pipe grouting in the arch of the tunnel, to reinforce and support the arch in advance, and to improve the formation of the tunnel face by grouting, and then Excavation, support and lining are carried out under the protection of pipe shed and reinforced arch ring. Specifically, the pipe shed construction in the prior art is generally realized in the following ways: [0003] Before the tunnel is excavated and the permanent support struc...

AI Technical Summary

Problems solved by technology

[0005] The traditional method of constructing pipe sheds has poor precision, the length of a single construction is too short, and the equipment has high requirements on the site environment. During the construction process, it is necessary to set up a studio and a work platform, and the vibration is large during mechanical operation, and there is no suitable The positioning device is easy to cause drilling deviation, which affects the quality of the hole, and there is also a greater risk

[0006] The pipe shed grouting process is backward, and the grout diffusion is poor; the grout is not uniformly spread, and the sand layer is prone to slipping, and there is no control and verification of the grouting effect; the layout of the grouting pipes lacks a unified standard; The Huanxi drill bit is placing the steel pipe, and the on-site backfill grouting is not timely enough; there is no uniform standard for the grouting pressure, and the individual grouting pressure is too low, and the orifice section has not been effectively sealed, resulting in the loss of mud, so that the grout cannot Fully fill the hole, prone to water gushing and sand gushing

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