An anti-shock interval grouting anchor cable and its application method

Abstract

The invention discloses an impact-resistant interval grouting anchor cable and a use method of the impact-resistant interval grouting anchor cable. The impact-resistant interval grouting anchor cable comprises a one-way grouting valve, a hollow grouting stranded steel wire, an arc-shaped anchor ring, a sliding pressure yielding retraction ring, a tapered grout blocking plug and a subsection sealing plug, the sliding pressure yielding retraction ring is arranged between the arc-shaped anchor ring and the tapered grout blocking plug, grout discharge valves are arranged on a flexible grouting pipe in the hollow grouting stranded steel wire at certain-length intervals, the subsection sealing plug is arranged at the front end of an expansion area of the stranded steel wire, and interval grouting is achieved. The using method comprises the steps that a grouting section L2n-1 and a non-grouting section L2n are arranged according to coal petrography mechanical parameters of a construction location, initial resin anchoring is carried out on the interval grouting anchor cable, the interval grouting anchor cable is tensioned and pre-tightened, grouting materials are prepared, and a grouting pump is used for achieving the interval grouting on the grouting anchor cable. According to the condition of surrounding rock, the grouting section and the non-grouting section are arranged, the force bearing condition of a supporting system is scientifically improved, the instant high stress state, caused by the intense deformation of the surrounding rock, of the stranded steel wire of the anchoring section is relieved, and an anchor cable support is prevented from losing efficacy.

Description

Technical field [0001] The invention relates to a grouting anchor cable used for supporting projects such as rock soil, water conservancy, and mines. Background technique [0002] Because of its large anchoring depth, high bearing capacity, and large pre-tightening force, the anchor cable can obtain an ideal supporting effect. In practical applications, the combined support method of bolt and cable is usually adopted. In the initial stage of roadway support, the flexible support of the bolt is the main method, and the suspension function of the anchor cable is the main function in the later period. The overall supporting performance of anchor rods and cables. However, in thick coal seams with poor stability, such as roadway driving along goafs, large cross-section cuts, and cross-mining roadways affected by dynamic pressure, the anchorage length is only 1 / 3 of the anchor cable length, so its bearing capacity It is too low and has limited reinforcement effect on broken top coal....

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the application of grouting anchor cables in the support of deep wells with large deformation roadways, the present invention provides an anti-shock interval grouting anchor cable and its use method. Through the innovation of the grouting anchor cable structure, the Grouting at intervals, on the basis of not reducing the support strength, to form a "non-grouting section" at intervals in the anchor cable support system, and design the length L of the "non-grouting section" according to the mechanical parameters of the rock mass in the support area 2n (n=1, 2,..., n), in the "non-grouting section", the anchor cable body can achieve a certain angle of bending and rotation in the anchor hole. The rotation and bending of the anchor cable body in the "grouting section" alleviates the instantaneous stress concentration in the high stress area of ​​the anchor cable anchor body, and to a certain extent avoids the phenomenon that the anchor cable body is sheared instantaneously

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