Construction method of embedded FRP rib-reinforced roadway roof

Abstract

The invention discloses a construction method of an embedded FRP rib-reinforced roadway roof. The construction method comprises the steps that after roadway tunneling work is stopped, anchor rod holesare constructed in empty positions of the roadway roof; a rectangular groove is constructed in the roof in the width direction of a roadway according to the array pitch of an existing anchor rod support structure; oblique holes at certain angles are constructed in positions, close to the shoulder position of the roadway, of the two sides of the groove; rock debris and impurities in the groove andthe oblique holes are removed; a resin anchoring agent is injected into the groove and the oblique holes; FRP ribs are placed in the groove in the roadway roof and the oblique holes constructed in the two sides of the groove; after the FRP ribs are completely bonded on surrounding rock of the roadway roof through the anchoring agent, the groove is completely filled with cement paste and is leveled up; and double-row steel bar joists are arranged in the length direction of the FRP ribs, and anchor rods penetrating through the double-row steel bar joists are fixed to a rock layer of the roadwayroof through the resin anchoring agent, so that construction work of one support link is completed. According to the construction method, operation is simple, and the tensile deformation resistance of the roadway roof can be effectively enhanced.

Description

technical field [0001] The invention relates to a construction method for strengthening the roof of a coal mine roadway, in particular to a process method for reinforcing the roof of a roadway by using embedded FRP bars, and belongs to the technical field of coal mine roadway support. Background technique [0002] Safe and efficient roadway support technology is the basic guarantee for realizing high-yield and efficient mining in modern coal mines. The support form of coal mine roadway in our country has gradually transitioned to bolt support after experiencing wood support, masonry support and U-shaped steel frame shed support. Compared with the early support structure, the anchor rod and its composite components (steel belt, steel joist and steel beam) effectively reduce the cost of roadway support and reduce the labor intensity of workers on the premise of ensuring safe production. Greatly improved the working environment. [0003] It is generally believed that after th...

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.

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