Steel-membrane composite constraint type arch frame for roadway (tunnel) supporting and construction process

Abstract

The invention discloses a steel-membrane composite constraint type arch frame for roadway (tunnel) supporting and a construction process, the steel-membrane composite constraint type arch frame is formed by compounding semi-constraint steel and a flexible constraint membrane sleeve, and the flexible constraint membrane sleeve expands to effectively fill a gap between the semi-constraint steel and the surface of surrounding rock and can generate active pre-pressure on the surrounding rock. And the semi-constraint steel and the flexible constraint membrane sleeve can hoop and constrain the internal filling material, so that the bearing performance advantages of different materials are efficiently exerted, and the surrounding rock pressure effect is jointly resisted. The problem that the bearing capacity is difficult to exert or local instability is easily caused by stress concentration of a conventional arch frame can be solved, the technical problem that the conventional arch frame is difficult to support in a yielding mode can also be solved, the high bearing capacity is achieved, the active supporting effect of surrounding rock can be achieved, the construction quality can be effectively guaranteed, the transportation efficiency can be improved, and the labor intensity of workers can be effectively relieved.

Description

technical field [0001] The invention relates to the technical field of roadway (tunnel) support, in particular to a steel-membrane composite constrained arch frame and construction technology for roadway (tunnel) support. Background technique [0002] Affected by the excavation unloading effect and the stress redistribution effect, the surrounding rock of the underground roadway (tunnel) will be loosened and damaged in a certain range after excavation. In order to ensure the stability of the surrounding rock within the range of loosening and damage, it is necessary to take certain support measures to control it. In the roadway (tunnel) construction by drilling and blasting method, the conventional roadway (tunnel) support technology mainly includes: shotcrete support, bolt (cable) support, metal mesh support, arch support, reinforced concrete Lining etc. Among them, the arch support is initially set up after the excavation of the roadway (tunnel), and it has a high bearing...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the uneven excavation profile of the surrounding rock section, after the arch frame is installed, there will be a certain gap between the surrounding rock and the arch support, and it is difficult to achieve "surface-to-surface" contact, which will lead to The surrounding rock pressure acting on the outer ring of the arch frame is uneven, resulting in stress concentration, and even causing the arch frame to be prone to local buckling and instability failure due to uneven force

[0005] (2) Due to the uneven excavation profile of the surrounding rock section, after the above-mentioned arches are installed conventionally, it is necessary to install wooden piles or shotcrete for the second time to effectively fill the gap between the arch frame and the surrounding rock. It is very cumbersome, and it is difficult to ensure the quality of arch gap filling and arch installation quality; and due to the material limitation of the above-mentioned intermittent filling method, it is difficult to achieve the pressure-absorbing and energy-absorbing support effect of the arch.

Moreover, it will also lead to higher quality of conventional arches, and there are problems such as low transportation and construction efficiency and high labor intensity.

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