A Retrievable Anchor Rod with External Friction Nail

Abstract

The invention discloses a recoverable bolt with external friction nails, which comprises a recoverable anchor, a drill bit, an enlarged disk, an anchor head, an air pressure pipe, a bolt bracket, a nut, a spiral rib, an outlet of an external friction nail, and an external friction nail. Nails, protective holes, signal transmitters, axial force gauges, signal transmission lines, springs, stoppers, upper washers, lower washers and fuses. The beneficial effects of the present invention are: the external friction nail can protrude from the outlet of the external friction nail under the impact of air pressure, and the external friction nail can be embedded in the surrounding rock and soil by using high-pressure gas, so as to achieve a better anchoring effect. There is an axial force meter fixed on the side of the friction nail, and the axial force meter is connected with the signal transmitter through the signal transmission line to facilitate the transmission of the axial force signal, so that the signal transmitter can input high voltage to the fuse layer through the signal transmission line to promote the fuse fracture Open, so that the external friction nail and the recoverable anchor are separated, so that the recoverable anchor can be pulled out later.

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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