Method for supporting steel strip connecting bridge of arch-shaped soft rock roadway with large section

Abstract

The invention discloses a method for supporting a 'steel strip connecting bridge' of an arch-shaped soft rock roadway with a large section, and aims at arch-shaped soft rock roadways which are provided with large sections and have intense deformation due to dynamic pressure influence and are difficult to support. The method comprises the steps as follows: firstly, a drilling hole is formed in the middle of an arch crown of a roadway; a high-strength prestressing compressible anchor rod is mounted; two W-shaped steel strips are in abutting joint along the section of the roadway, so that first steel strip holes on the two W-shaped steel strips are overlapped mutually; a tray is mouthed; a nut is screwed tightly by a driller; then drilling holes are formed towards two sides with the first drilling hole as a center; the prestressing compressible anchor rod is mounted, the W-shaped steel strips are anchored, steel strip holes in the position of an arch base line are reserved, and two groups of steel strips are further spliced. According to the method, the steel strips are connected end to end, the prestressing compressible anchor rod is mounted, so that the 'steel strip connecting bridge' is formed; and the adaptability to the shape of the roadway is enhanced, an integrated bearing structure is formed, the totally closed supporting for the roadway is achieved, and the deformation of surrounding rocks of the roadway is controlled greatly.

Description

technical field [0001] The invention relates to a large-section arched soft rock roadway "steel belt bridge" support method, which is applied in the field of large-section arched soft rock roadway support with severe deformation and difficult support due to mining. Background technique [0002] At present, there are problems such as slow excavation speed, high support cost, poor effect, difficult to guarantee operation continuity and safety in excavation and support of large-section soft rock roadway. The theory and practice of large-section roadway support in terms of scheme design, parameter selection, and support reliability are not perfect enough. With the further development of bolt support technology, especially the popularization and application of high-strength prestressed pressure bolt support in soft, broken, dynamic pressure, long-span and deep high-in-situ stress roadways, the deformation of roadway surrounding rock has been effectively reduced. control. Existi...

AI Technical Summary

Problems solved by technology

However, since the raw material of the steel belt is high-strength alloy steel, which has high rigidity and strength, it is easy to make the surface of the roadway in insufficient contact with the steel belt during the construction process, resulting in poor roadway support effect

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