Square steel confined concrete arch center wall back filling bolting-grouting support system and construction method

Abstract

The invention discloses a square steel confined concrete arch center wall back filling bolting-grouting support system and a construction method. The square steel confined concrete arch center wall back filling bolting-grouting support system comprises high-strength anchor rods, grouting anchor rods, grouting anchor cables and multiple square steel confined concrete arch centers, wherein adjacent square steel confined concrete arch centers are connected through longitudinal beams, anchor rod holes are formed in the longitudinal beams, longitudinal beam anchor rods penetrate the longitudinal beams through the anchor rod holes to be anchored into a surrounding rock, a wall back filling layer is arranged between the square steel confined concrete arch centers and the surrounding rock, and the square steel confined concrete arch centers, the wall back filling layer and the tunnel surrounding rock are connected through the longitudinal beam anchor rods. The high-strength anchor rods, the grouting anchor rods and the grouting anchor cables are constructed before the square steel confined concrete arch centers are erected. The square steel confined concrete arch center wall back filling bolting-grouting support system and the construction method are applicable to supporting of underground projects including weak broken surrounding rock tunnels and the like, the square steel confined concrete arch center wall back filling bolting-grouting support system has the advantages of being high in strength, good in stability, reasonable in stress and the like, and the square steel confined concrete arch center wall back filling bolting-grouting support system and the construction method can effectively improve the primary supporting strength after tunnel excavation and ensure the stability of the tunnel surrounding rock.

Description

technical field [0001] The invention relates to the field of tunnel support, in particular to a post-fill anchoring and grouting support system and a construction method for square steel-constrained concrete arch walls. Background technique [0002] With the development of our country's economy and society, more and more large-section roads and railway tunnels are being built, and the supporting problems are becoming more and more prominent. Especially when the tunnel is buried deep, the section design is large, or it is in some weak strata, the surrounding rock of the tunnel is loose and broken, and the self-stabilization time of the surrounding rock after excavation is short, while the traditional bolt, shotcrete or steel arch frame, which cannot provide sufficient initial support resistance in time, resulting in severe deformation of the surrounding rock of the tunnel or even collapse and damage. Therefore, in order to maintain the stability of the surrounding rock and en...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies of the existing technology, the present invention aims at the shortcomings of insufficient strength of the steel arch support in the existing primary support of the tunnel, and proposes a high-strength, stable, and reasonable force-bearing primary support suitable for tunnels with weak and broken surrounding rocks. Rear-fill anchor-grouting support system and construction method of square steel-constrained concrete arch wall

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