Step-by-step sectional type tunnel curtain grouting construction pipe set, device and construction method

Abstract

The invention discloses a step-by-step sectional type tunnel curtain grouting construction pipe set, device and construction method, the step-by-step sectional type tunnel curtain grouting construction pipe set comprises a plurality of sets of construction suites, each construction suite comprises two grouting pipes and a vacuum pipe, and the grouting pipes and the vacuum pipes are used for being inserted into grouting holes with different depths; each grouting pipe is formed by connecting a plurality of first grouting pipe sections in sequence; the vacuum pipe is formed by connecting a plurality of vacuum pipe sections and a plurality of isolation pipe sections which are communicated at intervals, each isolation pipe section is of a double-layer sleeve structure and comprises a second grouting pipe section and an isolation bag sleeve which are sleeved together, and the two ends of each isolation bag sleeve are attached to the outer walls of the two ends of the corresponding second grouting pipe section in a sealed mode to form an expansion bag cavity shape with the two ends closed. By means of the device and method, it is guaranteed that cement grout is fully injected into the surrounding rock stratum, the grout injection amount is increased, even network-shaped grout veins are formed in the surrounding rock, the reinforcing effect is good, the grout diffusion range is effectively controlled, and waste caused by disordered diffusion of materials is avoided.

Description

technical field [0001] The invention belongs to the technical field of tunnel grouting reinforcement, and in particular relates to a step-by-step and segmented tunnel curtain grouting construction pipe group, device and construction method. Background technique [0002] In the process of tunnel construction, more and more unfavorable geology is encountered in tunnel engineering, and tunnel curtain grouting construction, as one of the most effective means of improving strata, is widely used. However, in many undisturbed fine-grained soil strata, such as silt-fine sand, silt-fine sand with clay, silt-fine sand with gravel, etc., it is easy to permeate water and has poor self-stabilization ability. Slurry (suspension) is extremely difficult to inject, even if expensive chemical slurry (solution) is used, its diffusion radius is difficult to break through 1m, and the strength of slurry vein stones is very low, usually less than 0.5MPa (the strength of cement slurry stones is usu...

AI Technical Summary

Problems solved by technology

However, in many undisturbed fine-grained soil strata, such as silt-fine sand, silt-fine sand with clay, silt-fine sand with gravel, etc., it is easy to permeate water and has poor self-stabilization ability. Slurry (suspension) is extremely difficult to inject, even if expensive chemical slurry (solution) is used, its diffusion radius is difficult to break through 1m, and the strength of slurry vein stones is very low, usually less than 0.5MPa (the strength of cement slurry stones is usually greater than 10MPa), the effect of formation grouting reinforcement is unsatisfactory

[0003] In actual tunnel curtain grouting construction, it is often forced to adopt methods such as dense drilling, high-pressure grouting, and repeated grouting, but there are still problems such as small amount of grout injected, lumps of grouted veins and stones, and insufficient reinforcement. Uniform problems, and it is easy to cause severe extrusion and disturbance to the surrounding strata, resulting in large deformation and endangering the safety of buildings (structures)

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