Structure for grouting reinforcement of existing subway tunnel by inserting profile steel into grouting pipe and method

Abstract

The invention relates to a structure for grouting reinforcement of an existing subway tunnel by inserting profile steel into a grouting pipe. The structure comprises a tunnel segment ring, the grouting pipe, a grouting positioning device, the section steel and a stratum. The structure and a method of the structure have the beneficial effects that a tip is arranged at the bottom of a grouting steelfloral tube, and small holes arranged in a plum-blossom-shaped mode are formed from the middle surface to the bottom surface from a sparse mode to a dense mode, so that the smooth inflow and outflowof grout are guaranteed, and the grouting reinforcement effect is improved, and meanwhile, a main grouting pressure releasing area is moved backwards to the bottom of the grouting pipe, so that the situation that due to the fact that the secondary disturbance of grouting is too large, the deformation of an existing tunnel segment ring is caused, and then the deformation of a whole tunnel structureis caused is avoided; and multiple times of material blocking is carried out, and a waterproof cushion layer, a rubber ring and the like are arranged, so that the problem of possible leakage during tunnel grouting construction and subsequent steps is well solved, and compared with an existing reinforcement structure and an existing construction method, the novel structure and the method are greatly improved in waterproof performance.

Description

technical field [0001] The invention relates to the field of reinforcement of existing subway tunnel structures, in particular to a grouting reinforcement of existing subway tunnel structures and a method for inserting profiled steel into grouting pipes. Background technique [0002] With the continuous development of urban underground space and the gradual completion and operation of subway tunnels, more and more existing subway tunnels will inevitably have close-up construction around them. In addition, the sensitivity of subway tunnels to close-up construction is high. Most of the existing subway tunnels have different degrees of deformation. However, excessive deformation will not only lead to the opening of tunnel segments, dislocation, and warping of the track, but also cause water leakage and sand leakage due to excessive deformation and opening between segments, seriously affecting the operation safety and use of subway tunnels life. Therefore, in order to ensure t...

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Problems solved by technology

[0003] In the typical soft soil areas in my country, thick soft clay is widely distributed, which has the characteristics of high water content, high compressibility, low strength, high sensitivity, low water permeability, poor physical and mechanical properties, etc., and the construction risk is extremely high.

In engineering, grouting is often used to reinforce the surrounding stratum of the tunnel segment structure. However, due to the fluidity of soft soil and improper control of grouting construction, the grout flows, which can easily cause secondary disturbances in adjacent strata or adjacent existing structures.

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