Recoverable anchor rod provided with external friction nails

Abstract

The invention discloses a recoverable anchor rod provided with external friction nails. The recoverable anchor rod comprises a recoverable anchor rod body, a drill bit, an expansion disk, an anchor head, a pneumatic pipe, an anchor rod support, a nut, a spiral rib, external friction nail outlets, the external friction nails, protecting holes, a signal transmitter, axial force meters, signal transmission lines, springs, limiting devices, an upper washer, a lower washer and a fusing layer. The recoverable anchor rod has the beneficial effects as follows: the external friction nails can bulge outof the external friction nail outlets under pneumatic impact and can be embedded in the surrounding rock and soil body by the aid of high-pressure gas, and the relatively good anchoring effect is realized; one axial force meter is fixed on one side of each external friction nail and is connected to the signal transmitter through one signal transmission line, so that axial force signals can be transmitted conveniently, the signal transmitter can input high pressure to the fusing layer through the signal transmission lines to prompt the fusing layer to be broken, the external friction nails andthe recoverable anchor rod body are separated, and the recoverable anchor rod body can be pulled out conveniently in the later period.

Description

technical field [0001] The invention relates to a recoverable anchor rod, in particular to a recoverable anchor rod with external friction nails, which belongs to the field of geotechnical engineering support structures. Background technique [0002] In the construction of roadways, tunnels, foundation pits and slopes involved in civil engineering, affected by the characteristics of the rock and soil in the excavation range and the surrounding environment, the surrounding rock or surrounding soil will undergo large deformation, which will affect the construction and subsequent construction. The use brings huge safety hazards, and it is of great significance to strengthen the rock and soil within the excavation range. At present, in the field of geotechnical engineering, bolts have the advantages of easy installation, small space required for construction, and low cost. They are widely used in engineering fields such as initial support or final support of rock and soil. The ...

AI Technical Summary

Problems solved by technology

At present, in the field of geotechnical engineering, bolts have the advantages of easy installation, small space required for construction, and low cost. They are widely used in engineering fields such as initial support or final support of rock and soil. The effect of the contact stress between the bodies, in which adding a friction plate on the outer wall of the anchor, or adding a resistance device at the end of the anchor can achieve the goal of improving the bearing capacity of the anchor, but after the failure of the anchor support function, it cannot Recycling will pollute the surrounding environment and waste resources

Some bolts can be recovered by setting up a recovery device, but the bearing capacity of the bolt itself has not been improved. From another perspective, this type of bolt only emphasizes the recovery of the bolt, and does not increase the anchorage. The effect of carrying capacity

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