self-expanding anchor

Abstract

The invention discloses a self-expansion type anchor rod. The self-expansion type anchor rod comprises an orifice pressing plate (5) and an anchor rod body (1) penetrating through the orifice pressing plate (5). Threads are arranged on the anchor rod body (1) which is in thread connection with a nut (4). A self-expansion steel belt inner bayonet (41) is formed in the outer side of the nut (4). A self-expansion steel belt outer bayonet (51) is formed in the inner side of the orifice pressing plate (5). The self-expansion type anchor rod further comprises a self-expansion steel belt (2) with a plurality of strip-shaped holes. The anchor rod body (1) sequentially penetrates through the multiple strip-shaped holes so that the self-expansion steel belt (2) can be in a uniform wave shape. The inner end and the outer end of the self-expansion steel belt (2) are located in the self-expansion steel belt inner bayonet (41) and the self-expansion steel belt outer bayonet (51) respectively. The self-expansion type anchor rod achieves integrated linkage of breaking rock bodies penetrating through the self-expansion anchor rod, the stress mode of the rock bodies is changed fundamentally, the contact area between the anchor rod and the rock bodies is greatly increased, and therefore the anchoring reliability is greatly improved.

Description

technical field [0001] The invention relates to a self-expanding bolt, which is mainly used for ore and rock reinforcement. Background technique [0002] The existing bolts used for advance support are generally top-wedge type, and the rock at the bottom of the anchor hole bears the tensile force, and the backing plate of the anchor hole is tightened through the bolt body to fix the broken rock around the anchor hole. Because the force at the bottom of the anchor hole is relatively concentrated, when the rock mass at the bottom of the hole cannot bear the tension of the anchor rod, the rock mass around the anchor hole will caving, resulting in anchorage failure. [0003] Existing anchor cables are often used to anchor mine stope roofs, tunnels and workings. However, temporary support needs to be carried out first, and then the anchor cable is placed in the anchor hole and filled with expansive cement and other materials, which play an anchoring role after solidification. T...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that during the period from the temporary support to the load bearing of the anchor cable, the structure and stress of the ore body have changed greatly, which is not conducive to taking measures in the later stage

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