Method for construction of bias expansion tunnel
By employing anchor cable reinforcement and segmented excavation methods in tunnel construction, the problems of complex construction, low efficiency, and significant traffic disruption in tunnel widening construction were solved. This approach improved the stability and efficiency of the tunnel excavation process, reduced costs, and enhanced project quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUIZHOU ROAD & BRIDGE GRP
- Filing Date
- 2026-04-24
- Publication Date
- 2026-07-17
AI Technical Summary
Existing tunnel widening construction methods suffer from problems such as complex construction procedures, low efficiency, significant impact on traffic, limited structural improvement, high costs, and difficulty in deformation control.
The method involves installing anchor cables on the existing tunnel walls for prestressed reinforcement and support, excavating in sections and installing the initial support structure of the tunnel section by section, using the existing tunnel as a construction passage, and removing the prestressed support section by section. Combined with the segmented excavation sequence, this ensures a smooth transition of the stress system and reduces the use of temporary supports.
This improved the stability and construction efficiency of the tunnel excavation process, reduced traffic disruption, lowered costs, and enhanced project quality and deformation control precision.
Smart Images
Figure CN122407211A_ABST