A low prestress energy absorption anchor rod with expanding shell and construction method thereof

By using the design of expansion-shell type low prestress energy-absorbing anchor bolts, stable anchoring and enhanced frictional resistance are achieved through the cooperation of cone head and expansion shell plate. This solves the problems of unstable anchoring performance and reduced frictional resistance, and is suitable for reinforcement of soft rock with large deformation or hard rock burst strata, thus improving the safety and quality of the project.

CN119308706BActive Publication Date: 2026-03-31CHINA RAILWAY TUNNEL GROUP CO LTD +1
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Patent Information

Application Number
CN202411673037.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-21
Publication Date
2026-03-31
Estimated Expiration
2044-11-21

AI Technical Summary

Technical Problem

The anchoring performance of existing energy-absorbing anchors is unstable, and anchoring sections often detach, leading to overall anchor failure. This poses a threat to production safety and project quality. Furthermore, ordinary anchors experience reduced friction after tension and have insufficient shear resistance.

Method used

The expansion shell type low prestress energy-absorbing anchor bolt is adopted, which includes a cone head, an expansion shell plate, an inner rod and a sleeve rod. Through the cooperation of the cone head and the expansion shell plate, the cone head is moved to the rear end by the cap nut, which causes the expansion shell plate to expand and fit tightly against the inner wall of the borehole. The frictional resistance between the sleeve rod and the borehole wall is increased, so as to achieve stable anchoring and energy absorption effect.

Benefits of technology

It improves the stability and frictional resistance of anchorage, enhances the restraint effect on soil and rock masses, and is suitable for the reinforcement of soft rock with large deformation or hard rock burst strata. It restricts the deformation of soil and rock masses and improves the safety and quality of engineering projects.

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Abstract

The application discloses a kind of low prestress energy-absorbing anchor rod of expansion shell and its construction method, including cone head, expansion shell piece, inner rod and sleeve rod, the rear end of cone head and inner rod are connected in axial direction, wherein: cone head includes conical section, circular table section and cylindrical section connected in axial direction from front to back;Expansion shell piece is cylindrical shell, coaxially sleeved on the outside of cone head;When cone head moves towards the direction of expansion shell piece rear end, the large diameter part of circular table section enters expansion shell piece backwards, and expansion shell piece deforms radially outward;Inner rod is columnar rod body, and a plurality of first arc protrusions are arranged on the upper and lower walls of the rear section, and the first arc protrusions are arranged at intervals;Sleeve rod is columnar shell, and a plurality of second arc protrusions are arranged at intervals on the inner wall of each semicircular cylindrical shell along the length direction;Sleeve rod is coaxially sleeved on the outside of inner rod, and the second arc protrusions and the first arc protrusions are engaged.The anchor rod is firmly anchored, has excellent extension performance, and can be applied in soft rock large deformation or hard rock rock burst stratum reinforcement engineering.
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