A method of using a large deformation prestressed hydraulic expansion bolt

Abstract

The invention discloses a method for using a large-deformation prestressed hydraulic expansion bolt. It includes the following steps, step 1: forming a borehole on the surrounding rock; step 2: putting a large deformation prestressed hydraulic expansion bolt into the borehole, injecting water between the hydraulic expansion inner shell and the hydraulic expansion outer shell through the water injection port, Make the hydraulic expansion shell close to the wall of the borehole, and the hydraulic expansion inner shell close to the inner rod structure, and fix the inner rod structure in the borehole through the tray and nuts; the radial expansion of the hydraulic expansion shell exerts a force on the borehole Radial prestressing, the axial prestressing of the anchor rod body is applied through the tray and the nut; Step 3: When the surrounding rock is deformed, the hydraulic expansion inner shell is forced to expand radially through the cone head of the inner rod and the expansion shell of the cone head to realize the anchor The large deformation of the rod structure provides the axial and radial support resistance of the large deformation prestressed hydraulic expansion anchor rod. The invention has the advantage that the axial and radial prestress of the rod body can be applied simultaneously.

Description

Technical field [0001] The present invention relates to the field of rock and soil anchoring techniques, and more specifically it is a method of using a large deformation prestressed hydraulic expansion anchor. Background technique [0002] With the development of my country's resource development, the deep roadway project will face high-level stress problems, and the roadway excavation will result in engine disasters such as surrounding rocks and rock baking, the engineering practice shows that effective support can significantly improve the roadway Rock deformation, anchor support as an economic effective support, is widely used in underground engineering construction. However, the existing anchor structure does not consider the application of the rock radial prestressing, and cannot cause the rock of the anchor hole to restore the true three-way stress state. For the deep roadway rock blast or surrounding rock, the required support system must be required. High prestressed, hi...

AI Technical Summary

Problems solved by technology

However, the existing bolt structure does not consider the application of radial prestress on the rod body, and cannot restore the real three-dimensional stress state to the rock around the bolt hole. For deep roadway rockburst or large deformation of surrounding rock, the support system must be It has high prestress, high impact resistance and high energy absorption-energy dissipation characteristics (large deformation of bolt structure), while the existing bolt cannot meet the support requirements of deep rock mass engineering

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