The construction method of reinforcing the roadway roof with embedded frp bars

Abstract

The invention discloses a construction method for reinforcing the roadway roof with embedded FRP bars. After the roadway excavation work is stopped, bolt holes are constructed at the empty roof position of the roadway roof; Construct rectangular grooves on the roof; construct oblique drilling at a certain angle on both sides of the groove near the roadway shoulder angle; clean rock debris and impurities in the grooves and oblique drilling; drill holes in the groove and oblique drilling Put the resin anchoring agent in it; put the FRP reinforcement into the groove of the roadway roof and the oblique drilling on both sides of the groove; after the FRP reinforcement is completely bonded with the surrounding rock of the roadway roof through the anchoring agent, use cement slurry Completely fill the groove; arrange the double-row steel joists along the length direction of the FRP bars, use resin anchoring agent to fix the anchor rods passing through the double-row steel joists to the roadway roof rock layer, and complete the construction of a support link Work. The method is simple to operate and can effectively enhance the tensile deformation resistance of the roadway roof.

Description

Technical field [0001] The present invention relates to a coal mine road roof reinforcement construction method, and more particularly to a process method using an embedded FRP rib to reinforcement roadway roof, belonging to the technical field of coal mine roadway support. Background technique [0002] Safe and efficient roadway support technology is a basic guarantee for achieving high-yield efficient mining of modern coal mines. my country's coal mine roadway support has experienced wood support, masonry support, and U-shaped steel shed support, gradually transition to the anchor support. Compared with the early support structure, the anchor and its combination components (steel strips, steel bars, and steel beams) effectively reduce the cost of roadway, reducing the labor intensity of workers, reducing the labor intensity of workers, Greatly improved the work environment. [0003] It is generally believed that after the excavation of the roadway, the original surrounding rock...

AI Technical Summary

Problems solved by technology

At this time, simply using anchor rods and their combined components will not be able to effectively control the deformation and failure of the roadway roof caused by tensile stress.

In particular, the technical defects of using steel strips, steel joists and steel beams in controlling the deformation and failure of the roadway roof caused by tensile stress have gradually become prominent: (1) The undulation of the roadway roof makes the above-mentioned composite members unable to be effectively used in the construction process; The roadway roof is in contact with the roadway roof, so it cannot effectively play its supporting role at the initial stage of roadway roof sinking; (2) Whether it is a steel belt, a reinforced joist or a steel beam, it is fixed on the roadway roof by anchors during use. When the roof of the roadway sinks, the above-mentioned composite members cannot fully exert the tensile mechanical properties of the steel due to the lack of effective anchor points; (3) when the traditional steel reaches the yield strain, its tensile strength will no longer increase, resulting in the actual In the process of use, after the above-mentioned composite member exceeds the yield strain, it will not be able to provide a continuous increase in the constraint force on the roof of the roadway, and cannot effectively control the deformation and failure of the roof of the roadway under the action of tensile stress.

Images