Composite support system and its construction technology based on steel-concrete composite support and shotcrete

Abstract

The invention relates to a composite support system based on a steel-concrete composite support and a shotcrete and its construction technology, and belongs to the technical field of underground engineering support. The support system includes an anchor net layer arranged on the inner wall of the roadway, and is characterized in that A flexible shrinkable layer is set on the outer side of the above-mentioned anchor mesh layer, a bracket is erected on the outer side of the flexible shrinkable layer, and a steel mesh is arranged on the inside and outside of the bracket, and the frame sprayed layer is constructed with the bracket and the steel mesh as the skeleton, and the steel mesh and the bracket are embedded. A rigid layer is formed inside the body structure, and there is a flexible shrinkable layer between the rigid layer and the anchor shotcrete layer. After being compressed, the flexible shrinkable layer can give way to the reserved deformation space, and then contact the rigid layer to form a coupling support. Under the influence of multiple factors such as excavation disturbance, high ground pressure, and high ground temperature in the deep roadway, the system can not only adapt to a certain degree of irregular displacement and deformation of the roadway without structural layer damage; energy of.

Description

technical field [0001] The invention belongs to the technical field of underground engineering support, and in particular relates to a composite support system based on a steel-concrete composite support and a sprayed sling and a construction process thereof. Background technique [0002] With the increase of energy demand and the gradual increase of mining intensity in my country, deep roadway support faces problems such as large deformation of surrounding rock, high ground pressure in deep parts, and large amount of roadway bottom. At present, the deep roadway support mainly adopts concrete series support, U-shaped scaffolding support, active and passive coupling series support, etc., to ensure the stability of the roadway by controlling the deformation of the surrounding rock. In engineering practice, under the complex mechanical environment of "three highs and one disturbance" in the deep depths, the ductility failure of the rock is caused by the unequal pressure of the ...

AI Technical Summary

Problems solved by technology

This active-passive coupling support method has low bearing capacity. Shotcrete is a brittle support body, which is easy to crack after being compressed. At the same time, the support is not waterproof. Corrosion or water softening damage to the roadway floor will reduce the overall stability of the roadway

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