A temperature-responsive self-tightening bolt and its construction method

Abstract

The invention discloses a temperature response self-tightening anchor rod and a construction method thereof. The temperature response self-tightening anchor rod comprises a gear device, temperature response devices, a closed box body, a sleeve and a rod body, wherein the gear device is in contact with the temperature response devices, the closed box body is fixedly connected with the temperature response devices and the sleeve separately, and the rod body is fixed with the gear device; and the temperature response devices each comprise a spring, a temperature sensitive layer, a baffle, a spring end plate, a backing plate and a rustproof rod, wherein the two ends of the rustproof rods are correspondingly and fixedly connected with the baffles and the spring end plates, temperature sensitiveparts are arranged at the positions, between the baffles and the backing plates, on the rod body, and an anchor head is arranged at the tail end of the rod body. The construction method comprises thefollowing steps of a, leveling, b, positioning, c, drilling, d, rod body embedding, e, grouting, f, base installation, g, anchor head installation, h, self-tightening device installation, and i, package. According to the temperature response self-tightening anchor rod and the construction method thereof, operation is simple, and the self-tightening effect of the anchor rod can be achieved by onlyfirst time manual operation.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering equipment, in particular to a temperature-responsive self-tightening bolt and a construction method thereof. Background technique [0002] Anchor bolts are the main form of support for slopes, tunnels, and roadways. In the process of bolt support, the self-stability of the original soil and rock mass is fully utilized to achieve the effect of reinforcement. Compared with other reinforcement methods, it has the advantages of resource saving and post-maintenance. With the advantages of low frequency, less exposed corrosion, and extended bolt reinforcement life, it can well reinforce rock and soil to prevent its deformation, collapse, and damage; and it is also convenient to apply in sparsely populated areas. [0003] However, in the actual application process, various deformations and even failures are likely to occur due to the poor tensile and shear resistance of the anchor rod, w...

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Problems solved by technology

[0003] However, in the actual application process, due to the poor tensile and shear resistance of the anchor rod, it is easy to produce various deformations and even fail, and the ideal effect cannot be achieved.

The utility model with the authorized announcement number "CN 201320830856" relates to a prestressed anchor rod, but the technology has the following disadvantages: (1) Low shear strength: the borehole diameter is small, the length of the prestressed anchor rod is large, and it cannot resist soil (2) The utilization rate of the anchor is low: the tightness between the anchor and the rock formation is large enough at the initial stage, but the slope will inevitably move for a long time, so the anchor will be damaged; (3) High manual maintenance: the later period needs to be manually repaired regularly Strong maintenance efforts to prevent silent failure

[0004] In general, there are certain defects in the currently used bolts: (1) soil deformation leads to the loosening of the bolts, which reduces its anchoring effect; (2) poor pull-out resistance; (3) poor slip resistance; ( 4) The service life of the bolt is limited, and the labor investment in later maintenance is relatively large

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