Device for increasing inverted-arch anchor rod anchoring force for soft rock roadway

Abstract

The invention discloses a device for improving the anchoring force of an anti-bottom arch bolt in a soft rock roadway, which includes a bolt, a bolt plate, cement slurry, mudstone and a bottom plate. The inside of the bottom plate is provided with a bolt, and the outside of the bolt is filled with Re-spraying, the bottom of the re-spraying is filled with reverse bottom arch primary spraying, and a mesh is set in the middle of the re-spraying and reverse bottom arch primary spraying, the bottom of the reverse bottom arch primary spraying is mudstone, An anchor disc runs through the surface of the anchor rod, an anchoring agent is arranged under the cement slurry, and the anchoring agent is wrapped on the surface of the anchor rod. The present invention uses anchoring agent and cement slurry to cooperate with the full-length anchoring method through the bottom plate to enhance the water-proof and anchoring effect. When there is water in the bottom plate, the slime formed by water in the hole affects the anchoring agent and the hole wall. The traditional method only It can meet the pre-tightening force requirements, but when the roadway is pressed, the anchorage end cannot be guaranteed to meet the yield and breaking force requirements of the anchor rod, causing the anchor rod and anchoring agent to be pulled out as a whole, making the overall support invalid.

Description

technical field [0001] The invention relates to the technical field of bolt fixing, in particular to a device for improving the anchoring force of a reverse bottom arch bolt in a soft rock roadway. Background technique [0002] The geological strata of the new Shanghai No. 1 Coal Mine are mainly soft rock formations such as mudstone and sandy mudstone. The focus is on floor treatment. The anchoring force of the anti-bottom arch anchor is the most critical factor in determining floor treatment. It is necessary to further improve the anchorage quality of soft rock roadway bolts (cables), so as to meet the requirements of ensuring roadway formation and reducing roadway maintenance costs. Under rocky geological conditions, especially in water tunnels, solving the problem of anchoring force of floor bolts basically solves the problem of soft rock. Most of the mines in Shanghai Miao mining area are in soft rock formations. The development and preparation of mines will encounter th...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies in the prior art, the present invention provides a device for increasing the anchoring force of the anti-bottom arch bolt in soft rock roadways, which solves the problem of the anchoring force of the anti-bottom arch bolt in the bottom plate treatment of the roadway support in soft rock formations

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