Composite anchor rod and construction method thereof

Abstract

The invention relates to a composite anchor rod and a construction method thereof, and relates to the technical field of geotechnical engineering anchoring. The construction method comprises the following steps that a rotary injection pipe is drilled to the hole bottom of an anchoring hole, compressed air and cement slurry are input into the rotary injection pipe, and the rotary injection pipe is rotated and lifted from the hole bottom of the anchoring hole to the upper portion; then a drilling machine is erected according to the hole position and the hole direction of the anchoring hole, the drilling machine is used for conducting hole guiding on a large-diameter cement soil anchoring body, and punching is conducted to the hole bottom of the anchoring hole; then a grouting pipe and a plurality of rod bodies are put into a sleeve; and the grouting pipe injects cement slurry from the hole bottom of a mounting hole till the cement slurry overflows from a hole opening of the mounting hole, then the sleeve is slowly pulled out, the cement slurry is supplemented to the hole opening of the anchoring hole, after the strength of the cement slurry meets the design requirement, high-strength embedded cement slurry is formed, and the composite anchor rod can be obtained. The composite anchor rod and the construction method thereof have the beneficial effects that the problems that an anchor cable is long and the local compressive bearing capacity is insufficient are solved, and the anchor rod can provide large anti-pulling bearing capacity.

Description

technical field [0001] The present application relates to the technical field of geotechnical engineering anchoring, in particular to a composite anchor and a construction method thereof. Background technique [0002] As a tensile member that goes deep into the ground, the anchor rod is connected to the engineering structure at one end, and the other end goes deep into the stable ground. The whole bolt is divided into a free section and an anchor section. The free section refers to the anchor in the potential sliding surface area of ​​the soil. Its function is to transmit the tensile force at the head of the anchor to the area of ​​the anchor; the anchor section refers to the area where the cement paste bonds the prestressed tendons to the soil layer, providing friction for the bond between the anchor and the soil layer. , whose function is to increase the pressure-bearing effect of the anchor, and transmit the tension of the free section to the depth of the soil. [0003] ...

AI Technical Summary

Problems solved by technology

[0003] During the construction of weak or loose soil layers, due to the characteristics of the weak or loose soil layers that are easy to collapse when drilling, the maximum diameter of the anchor body for the construction of the existing drilling rig drilling method can only be about 200mm, and the soft or loose soil layers and The cohesive force value of the anchor is small, resulting in a small anchoring force. In order to make the pull-out bearing capacity of the anchor meet the requirements, a very long anchor is required in engineering applications.

[0004] In addition, the high-pressure cement slurry rotary spraying completes the reinforcement of soft and loose soil through the construction method of jet cutting the soil. The anchoring body is a mixture of cement slurry and soil, and the uniaxial compressive strength is low, so it is only used for uplift bearing. Anchor engineering with low force

[0005] In view of the above-mentioned related technologies, the inventor believes that in the actual production process, a longer anchor body requires a longer anchor rod drilling length, resulting in an increase in construction cost and increased construction difficulty; if the length of the anchor rod is too short , there is a case where the uniaxial compressive strength of the anchor is low and the anchor project with a large pull-out bearing capacity will have insufficient local compressive bearing capacity, resulting in the infeasibility of the anchor scheme

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