Combination structure of steel-concrete anti-arch and anchor rod used to control roadway underside and construction method of the combination structure

Abstract

The invention relates to a combined structure of a reinforced concrete reverse arch and anchor rods and for managing roadway bottom swelling. The combined structure comprises first I-shaped steel beams arranged along the length direction of a roadway baseplate, notches of sliding grooves on two sides of the first I-shaped steel beams are horizontally arranged, the first I-shaped steel beams are arranged along the width direction of a roadway at intervals, second I-shaped steel beams are arranged along the width direction of the baseplate of the roadway and along the length direction of the first I-shaped steel beams at intervals and are of a frame-shaped structure integrally, notches of sliding grooves on two sides of the second I-shaped steel beams are arranged vertically, the anchor rods are penetratingly arranged at two ends of the second I-shaped steel beams and fixedly connected with baseplate surrounding rock of the roadway, and concrete is poured on the combined structure to form a concrete layer. Stress in the vertical direction of the baseplate of the roadway is transferred towards the length direction and the width direction of the roadway, the combined structure of the reinforced concrete reverse arch and the anchor rods form a whole, and the reinforced concrete reverse arch and the anchor rods are jointly stressed, so that the combined structure is convenient and quick to construct and good in bottom swelling managing effect.

Description

technical field [0001] The invention relates to the technical field of roadway support, in particular to a combined structure of a steel-concrete reverse arch and anchor rods for treating roadway undercuts and a construction method of the combined structure. Background technique [0002] Bottom sill phenomenon is a special problem in the stability of roadway surrounding rock. In recent years, with the continuous increase of mine mining depth, the engineering problems of large deformation, high ground pressure and difficult support of soft rock roadway and weak structure roadway have become more and more serious. Bottom scuffing has become one of the main characteristics and forms of deformation and failure of surrounding rock in soft rock roadways and weakly structured roadways. Aiming at the mechanism and prevention measures of subsidence, extensive researches have been carried out at home and abroad. Meanwhile, many prevention and control measures have appeared both at hom...

AI Technical Summary

Problems solved by technology

Such as floor grouting, which penetrates into the cracks of the rock formation through the grout, increases the cohesion of the broken rock, and forms an anti-arch in the floor that is stronger than the broken rock layer, thereby preventing the lower rock layer from bulging upwards, but its implementation A bolter drilling rig is required to drill grouting holes, which is difficult to drill and remove residual coal ash. It takes a long time, is expensive, and has a high degree of suppression of deformation caused by vertical stress.

In the pressure relief method, the original continuous rock mass is in a discontinuous state by means of cutting slits, so that the concentrated stress around the roadway is transferred to the deep part of the surrounding rock. At this time, the floor is in the stress reduction zone. The roadway remains stable, but with the growth of time and the extrusion movement of the rock formation, its state will be destroyed again, and it can only continue to cut seams, which is very troublesome

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