Tension and compression coupling type high-strength and high-deformation anchor rod and method for using same

Abstract

The invention discloses a tension and compression coupling type high-strength and high-deformation anchor rod and a method for using the same. The tension and compression coupling type high-strength and high-deformation anchor rod mainly consists of an anchor rod body, a tray and a nut, the outside of a hole is fixed by the nut and is used as an outer anchoring section, the inside of the hole is adhered with the anchor rod body after being filled with anchoring agents and is used as an inner anchoring section, the surface of the anchor rod body of the inner anchoring section is in two states, a portion, which is close to a hole opening, of the surface of the anchor rod body of the inner anchoring section is smooth and round, a portion, which is close to a hole bottom, of the surface of the anchor rod body of the inner anchoring section is rough, the smooth and round rod body is a temporary inner anchoring section, namely a quasi-free section, the rough rod body is a permanent inner anchoring section, and a load bearing table is arranged on the rod body and is adjacent to the permanent inner anchoring section and the temporary inner anchoring section. The stress state of the anchor rod during field application is obviously optimized, the tension and compression coupling type high-strength and high-deformation anchor rod is simple in structure, and the reliability and the supporting effect of the anchor rod are improved obviously under the conditions that construction efficiency is not affected and cost is only increased a little.

Description

technical field [0001] The invention relates to a support bolt used in projects such as water conservancy and hydropower, slopes, tunnels and mines, in particular to a high-strength prestressed deformable bolt and a method for using the same. Background technique [0002] In the engineering support process of mines, water conservancy and hydropower, slopes and tunnels, bolts are a kind of support equipment that is widely used. With the continuous increase of mining depth and the construction of large-scale underground projects, the geological conditions are becoming more and more complex, and the surrounding rock often shows the characteristics of high stress and large deformation. This situation requires the anchor rod to have both high anchoring force and good deformation performance. [0003] According to the stress state of the grouting body, anchors can be divided into two types, one is tension anchors and the other is pressure anchors. [0004] Tensile anchors such a...

AI Technical Summary

Problems solved by technology

However, the bearing capacity of the inner anchorage section is limited by the compressive strength of the anchoring agent itself and the shear strength between the anchoring agent and the hole wall, so it is difficult to achieve a higher bearing capacity

[0006] In order to make the anchor rod have a large deformation property, the current large deformation anchor rod generally realizes the deformation of the anchor rod by setting mechanical structures such as friction sleeves and sliding between the rod body and these structural elements, such as Chinese patents CN 101858225A, 201110061303.0, 201210020742.1, 201110187361.8, etc. These large deformation bolts have complex structures and high costs

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