Hydraulic expansion bolt

Abstract

The invention discloses a hydraulic expansion bolt. The hydraulic expansion bolt comprises a radial expansion device, an elastic sleeve, a connecting steel bar, an anchoring plate and a fixed frame. One end of the connecting steel bar is fixedly connected with the anchoring plate arranged on the earth surface, the other end of the connecting steel bar is fixedly connected with one end of the fixed frame, and the other end of the fixed frame is fixedly connected with the elastic sleeve. The radial expansion devices are axially arranged in the fixed frame and the elastic sleeve. The radial expansion device comprises hydraulic oil cylinders, a plurality of radial extension assemblies, an oil pipe and an oil pressure gauge, the hydraulic oil cylinders are fixedly installed on the fixed frame, the radial extension assemblies are hinged to piston rods of the hydraulic oil cylinders and evenly distributed in the circumferential directions of the piston rods, the oil pipe is connected with the hydraulic oil cylinders, and the oil pressure gauge is connected with the oil pipe. The hydraulic expansion bolt has the advantages that the hydraulic oil cylinders act on different positions of steel sheets, the contact areas of the steel sheets and anchoring hole walls are increased, and the bearing capacity of the anchor can be remarkably improved.

Description

technical field [0001] The invention relates to a hydraulic expansion bolt, which is used for the protection, reinforcement and rescue work of soil or soft soil slopes in building foundation pit support engineering, and belongs to the technical field of roadway support. Background technique [0002] Bolt support is a reinforcement and support method used in surface engineering such as slopes, deep foundation pits of rock and soil, and underground chambers such as tunnels and stopes. It is made of metal parts, wood parts, polymers or other materials. To form a column, drive into the surface rock mass or the pre-drilled hole in the rock mass around the chamber, use the special manufacturing of the head, the rod body and the tail support plate, or rely on the bonding effect to combine the surrounding rock and the stable rock mass Together, they produce suspension effects, composite beam effects, and reinforcement effects to achieve the purpose of support. [0003] The existing...

AI Technical Summary

Problems solved by technology

This kind of pre-hole grouting bolt has the following three disadvantages: First, under the given geological conditions, the increase of the anchoring force can only be increased by increasing parameters such as the diameter and length of the bolt, and the increase of these parameters has led to Huge economic waste, sometimes increasing the length of the anchor rod is also limited by the surrounding space; second, after the anchoring task is completed, the tie bars and grouting stones of the anchor rod are all kept in the underground soil for the later development and utilization of the surrounding underground space. The third is that the anchoring force can only be formed after the grouting construction of the anchor rod is completed and the grouted stone body reaches a certain strength, resulting in a slow construction progress, and once the construction of the anchor rod is completed, the anchoring force cannot be increased. In the case of dangerous situations such as shifting trend, if measures can be taken to increase the anchoring force of the bolt, it is entirely possible to avoid further instability of the slope

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