Prestressed full-anchor squeezed anchoring device and method thereof

Abstract

The invention discloses a prestressed full-anchor squeezed anchoring device and method thereof. The device comprises a casing with the inner diameter larger than the diameter of an anchor bolt, and a plurality of first holes are distributed in a cross shape on the wall of the casing. A plurality of pulp-divided annular stoppers are sleeved on the casing at intervals, second holes which are a bit larger than the first holes are symmetrically reserved on the front side of the casing, a spring is fixed at the top of the plug which is arranged in the upper portion of the casing, and the casing is coated with polyethylene plastic film outside. Two resin anchoring agents with different solidified time are injected into the casing, then the casing filled with the anchoring agents is inserted into the borehole so that the pulp-divided annular stoppers sleeved on the casing are distributed at intervals and stop the drill holes separately ; when the anchor bolt is inserted into the casing, the two anchoring agents in the casing are squeezed through the holes successively, and then fill the gap between the wall of the tube and the walls of the holes; by the action of intermediate-speed anchoring agents, the top of the anchor bolt is anchored within a short time. The prestressed full-anchor squeezed anchoring device and method thereof have the advantages that the structure is simple and the operation is convenient, the stability is strong, the positioning is accurate and usage is easy.

Description

technical field [0001] The invention relates to a prestressed full-anchor extruded anchor rod and a method thereof, in particular to a prestressed full-anchor extruded anchor rod suitable for accurately positioning the axis of the hole core for surrounding rock support in coal mine shafts or geotechnical engineering reinforcement and methods. Background technique [0002] The support of roadway surrounding rock plays an important role in coal mining. Among them, the bolt support technology has been widely used in various mining areas at home and abroad because of its high reliability, high adaptability and excellent performance. Especially the resin bolt support technology has been developed by West Germany since 1958 After the resin anchoring agent was developed by the Essen Mining Research Center, it has been continuously improved and promoted. The anchoring force of the resin anchor rod is large and the reliability is high. The resin anchoring agent tightly bonds the ho...

AI Technical Summary

Problems solved by technology

[0004] However, the ensuing problem is the feasibility of on-site industrial experiments. In the installation of anchor rods, the traditional way is to insert anchoring agent after drilling, and then drill into the anchor rods under the drive of the drilling rig. It is extremely difficult to ensure the uniformity of the thickness of the annular anchoring agent around the anchor rod, and it is extremely easy to cause the deviation between the anchor rod axis and the drilling axis, which brings a series of problems: such as the increase of the eccentricity of the anchor rod, the resin around the anchor rod The stress of the anchoring agent and the surrounding rock of the drilling hole is uneven, or even greatly different, resulting in stress concentration and additional bending moment on the anchor rod, resulting in poor stability

[0005] In the existing bolt support, the accuracy of the thickness of the annular resin anchoring agent around the rod body is rarely considered, and there is no good way to control the compatibility between the diameter of the drill hole and the diameter of the rod body, and there is no better way to control Whether the anchoring agent is stirred evenly or not

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