Self-propelled hollow grouting expansion anchor rod and construction method thereof

Abstract

The invention discloses a self-propelled hollow grouting expansion anchor rod and a construction method thereof. The anchor rod comprises a hollow grouting anchor rod body, wherein a self-propelled drill bit is arranged at one end of the grouting anchor rod body; a grout outlet of the drill bit communicates with a grouting channel of the grouting anchor rod body; an inner pull rod is arranged in the grouting channel of the grouting anchor rod body; a plurality of plate-shaped barbs and a plurality of grouting holes are formed in an outer rod body of the grouting anchor rod body; one end of each plate-shaped barb is connected with the outer rod body through a hinge device, and the other end of each plate-shaped barb is connected with a connecting rod and a spring; the other end of each connecting rod penetrates through one grouting hole and is connected with the inner pull rod; the other end of each spring is connected with the outer rod body; during drilling, the plate-shaped barbs arein contact with the outer rod body; and after the inner pull rod is pulled, an included angle is formed between each plate-shaped barb and the outer rod body. The hollow grouting expansion anchor rodcan be used as a reinforcing anchor rod integrating drilling, expansion and grouting in the field of tunnel and underground space engineering reinforcement, and is used for increasing the binding power and anchoring force of the anchor rod, so that the reinforcing effect is enhanced.

Description

technical field [0001] The invention relates to the field of tunnel and underground space engineering reinforcement, in particular to a self-advancing hollow grouting expansion bolt and a construction method thereof. Background technique [0002] With the research, application and development of excavation technology, bolting and shotcrete support technology, and ground improvement technology, tunnel workers have developed a variety of auxiliary stability measures, which makes the excavation and support of modern tunnel construction more simple, timely and efficient. Effective, thorough, and more preventive and safe. [0003] However, since most of the grouted anchor rods are of columnar structure, the insufficient axial tension after anchoring will cause the problem of poor anchoring effect. Since the grouting anchor mainly bears the tension effect, after the cement mortar solidifies, its tensile capacity is far lower than the compressive capacity. In the soil with poor st...

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Problems solved by technology

[0004] In order to solve the problem of poor anchoring effect of grouting bolts in the prior art, the object of the present invention is to provide a self-propelled hollow grouting expansion bolt and its construction method. The hollow grouting expansion bolt is used in tunnels and underground In the field of space engineering reinforcement, drilling, expansion and grouting can be used to strengthen the anchor rod, which is used to increase the bonding force and anchoring force of the anchor rod, and enhance the reinforcement effect

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