Climbing reverse roof picking and combined excavation method for large-section tunnel fan room
By using the method of reverse overpassing and combined excavation, along with the combined support of anchor bolts, steel mesh, steel arches and shotcrete, the problem of overpassing and widening excavation in the construction of ventilation rooms in large-section tunnels was solved, achieving safe, efficient and economical construction results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CCCC SHEC DONGMENG ENG CO LTD
- Filing Date
- 2026-05-15
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional tunnel excavation methods are difficult to adapt to the needs of large-section roof lifting and widening excavation. They involve complicated procedures, large amounts of support removal, slow construction progress, high costs, and limited working space inside the tunnel. In addition, conventional excavation and support methods cannot guarantee the structural stability of intersections, affecting operational safety and structural durability.
The method of climbing and reverse top lifting and combined excavation is adopted. The excavation is organized in layers and sections, and combined with the joint support of anchor bolts, steel mesh, steel arch frame and shotcrete. The arch and arch foot are reinforced with emphasis. Excavation, backfilling and support are carried out simultaneously to form a working platform, reduce the exposure time of the surrounding rock and improve the stability of the surrounding rock.
It enables smooth connection of small-section transport channels to large-section fan rooms, reduces the risk of arch collapse, improves arch forming quality, ensures good surrounding rock stability and safety control, reduces slag discharge, improves work efficiency, and reduces costs.
Smart Images
Figure CN122407205A_ABST