A flexible integral concrete spraying layer for roadway bolting and spraying support and its construction method

Abstract

A roadway anchoring and shotcreting support flexible integrated concrete spraying layer is a concrete spraying layer with three axial and circumferential steel wire rope nets as frameworks on a roadway surrounding rock surface and comprises a first sprayed concrete layer, a second sprayed concrete layer, a third sprayed concrete layer and a fourth sprayed concrete layer which are sequentially sprayed to roadway surrounding rocks after the surrounding rocks are excavated from a roadway and exposed. A plurality of first anchor rod layers, a plurality of second anchor rod layers and a plurality of third anchor rod layers are arranged in coal (rock) layers inside the sprayed concrete layers of the roadway, all anchor rods of the first anchor rod layers are uniformly arranged along the axial direction of the roadway, each row of first anchor rods comprise a plurality of first anchor rods uniformly arranged along the circumference of the roadway, and the first anchor rods penetrate the first sprayed concrete layer. The roadway anchoring and shotcreting support flexible integrated concrete spraying layer is reasonable in structural design, convenient in construction and remarkable in on-site test effect, integrity and deformability of the concrete spraying layer can be improved, the concrete spraying layer is combined with surrounding rock grouting technology, the quality of an anchoring and shotcreting support is further improved, and the applicable range of the anchoring and shotcreting support in the deep roadway is widened.

Description

technical field [0001] The invention belongs to the technical field of roadway support in coal mines, and in particular relates to a flexible integral concrete sprayed layer for roadway anchor-spray support and a construction method thereof. Background technique [0002] Bolt-shotcrete support is the abbreviation of joint support of bolt and shotcrete (referred to as concrete). In the support of stable and moderately stable surrounding rock roadways, bolt-shotcrete support technology has become the main support form of coal mines. Compared with the shed-type roadway support, the bolt-spray support is convenient for construction, supports the surrounding rock quickly and timely, and can give full play to the self-supporting capacity of the surrounding rock and the bearing effect of the bolt. However, in recent years, with the development of coal seam mining to the deep, more and more coal mines have encountered deep soft rock formations. In the roadways or chambers excavated ...

AI Technical Summary

Problems solved by technology

The anchor tray in the area where the spray layer falls off is loose, the anchor loses its bearing capacity, the anchor spray support fails, and the surrounding rock is in a state of no support, which intensifies the deformation rate of the surrounding rock and deteriorates the stability of the surrounding rock; The problems existing in the layer structure, how to improve the overall performance of the concrete sprayed layer, reduce the rigidity of the concrete sprayed layer, increase the limit deformation of the concrete sprayed layer, and improve the residual strength of the concrete sprayed layer The technical key of popularizing bolt-shotcrete support

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