A rectangular frame subway tunnel shock absorption and crack prevention structure and a construction method thereof

By installing damping devices and PVA fiber reinforced concrete secondary linings at weak points in rectangular tunnels, the problem of poor damping effect of rectangular tunnels under the action of transverse and longitudinal waves was solved, achieving more effective tunnel damping and crack prevention, and improving the seismic performance and service life of the tunnel.

CN121205655BActive Publication Date: 2026-07-21CHINA RAILWAY LIUYUAN GRP CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA RAILWAY LIUYUAN GRP CO LTD
Filing Date
2025-09-28
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing tunnel vibration reduction and reinforcement technologies are mainly designed for circular or saddle-shaped tunnels. They cannot effectively cope with the deflection motion between the top horizontal plane and the side wall vertical plane of rectangular tunnels under the action of transverse and longitudinal waves, resulting in poor vibration reduction effect and no special reinforcement for weak points.

Method used

Vibration damping devices are installed at weak points in rectangular tunnels. A secondary lining improved with PVA fiber concrete is used, combined with anchor bolts, a damping layer, and a filling layer. Seismic energy is absorbed by hydraulic dampers, steel springs, and corrective dampers. PVA fibers are used to enhance the deformation capacity and crack resistance of the concrete.

Benefits of technology

It improves the vibration reduction effect of rectangular tunnels under the action of transverse and longitudinal waves, prevents tunnel cracks and leakage, extends service life, and reduces maintenance costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of rectangular frame subway tunnel shock absorption and crack prevention structure and its construction method, and the rectangular tunnel is provided with the connecting inclined surface of certain angle between horizontal top surface and vertical surface of side wall, and the shock absorption and crack prevention structure includes shock absorption layer, shock absorber and PVA fiber improved secondary lining concrete;Shock absorber includes steel spring, hydraulic damper and correction shock absorber, hydraulic damper is sleeved in steel spring, correction shock absorber is arranged on both sides of hydraulic damper, and is hinged on the fixed plate of primary lining and secondary lining, and the filling layer between secondary lining and primary lining uses high molecular polymer, and secondary lining concrete is mixed with PVA fiber according to certain proportion.The application realizes that rectangular tunnel is under the action of transverse wave and longitudinal wave, when earthquake action is transmitted to weak position, it is converted into vertical earthquake action to lining surface by correction shock absorber, and the damage of tunnel by earthquake is reduced by absorbing the earthquake energy through hydraulic damper, effectively avoid the leakage phenomenon of tunnel, and improve the service life of tunnel.
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Citation Information

Patent Citations

  • Implementation method suitable for tunnel lining energy dissipation and shock absorption structure in earthquake high-intensity area

    CN114542105A

  • Anti-seismic protection structure for bedding slope tunnel portal and construction method

    CN117189158A