Closed pipe seam anchor rod body

Abstract

The invention discloses a closed tube seam anchor rod body and relates to an anchor rod body of a tube seam anchor rod device of geotechnical engineering support. The closed tube seam anchor rod body aims at overcoming the defects of the great effect on anchor force and the failure of anchor rods caused by the fact that the prior longitudinal slotted steel tube rod tube seam anchor rod anchor force is low, the slotted steel tube radial low rigidity elastic deformation restricts the improving of the tube seam anchor rod anchor force and when engineering service time in roadways and the like are long and water sprays, the inner walls of the tube seam anchor rod longitudinal slotted steel tube rod bodies are exposed in the spray water completely and can be corroded easily. The closed tube seam anchor rod body comprises a section local concave hollow high-strength thin-wall steel tube, a seal plate and a retaining ring. An inner groove is formed along the longitudinal direction of the total length. The seal plate is connected and fixed with an inner end opening of the section local concave hollow high-strength thin-wall steel tube, and the retaining ring is connected and fixed with an outer end opening of the section local concave hollow high-strength thin-wall steel tube. Compared with prior tube seam anchor rods, the closed tube seam anchor rod body has the advantages that the anchor force is improved apparently, the anchor force is large, the rock reinforcement effect is good, and the effect on the anchor rod anchor force by exposure of tube seam anchor rod body inner walls in the spray water is prevented.

Description

technical field [0001] The invention relates to a bolt device for underground roadway, foundation pit and slope support of coal mines, metallurgical mines, etc., in particular to a rod body device for pipe seam bolt support in rock and soil engineering. Background technique [0002] At present, the known conventional pipe seam bolt body is a high-strength steel pipe that is longitudinally slit along the entire length and is rolled from a thin steel strip. The cross section of the slit steel pipe is a circular ring "C" with a gap. The working principle is to use external force to drive the pipe seam anchor rod into the rock and soil borehole whose diameter is 1-3mm smaller than the outer diameter of the anchor rod or directly into the soil layer, the slotted steel pipe is compressed, and the outer wall of the steel pipe and the drilled hole The wall is tightly squeezed; using the elasticity of the longitudinally slit steel pipe along the full length to generate radial pressur...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the low anchoring force of the existing longitudinally slit steel pipe rod body, the elastic deformation of the radially low stiffness value of the slit steel pipe restricts the improvement of the anchoring force of the pipe slit anchor, and the service time in roadways and other projects is long and When there is water spraying, the inner wall of the steel pipe rod with longitudinal slits of the pipe seam anchor is completely exposed to the water, which is easy to corrode, which greatly affects the anchoring force, and even causes the failure of the anchor rod. The present invention provides a closed pipe seam anchor rod body device

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