A method for reverse breakthrough construction of small and medium-sized tunnel portals

By using the reverse-through construction method for small and medium-sized tunnels, the problems of extended construction period and high safety risks at tunnel entrances were solved, construction efficiency was improved and costs were saved, and the stability and safety of the tunnel entrance protection project were ensured.

CN116877087BActive Publication Date: 2026-03-10SINOHYDRO BUREAU 14 CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-16
Publication Date
2026-03-10

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Abstract

This invention discloses a method for reverse breakthrough construction of small and medium-sized tunnel entrances, comprising the following steps: First, under favorable conditions for entry into the main tunnel, excavation and drilling / blasting of the main tunnel are carried out until the main tunnel reaches the connection point with the traffic tunnel; then, protective construction is carried out at the entrance and slope of the traffic tunnel; next, arch construction is carried out at the entrance of the traffic tunnel; finally, drilling and blasting are performed to achieve breakthrough from the main tunnel towards the traffic tunnel. This method for reverse breakthrough construction of small and medium-sized tunnel entrances effectively solves the problem of excessive disturbance to the tunnel face caused by forward tunnel blasting, thus improving construction efficiency and safety.
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Citation Information

Patent Citations

  • Cut-through excavating construction method for large-cavern-diameter and small-cavern-diameter underground caverns

    CN106285732A

  • Tunnel-entering construction method for semi-open and semi-underground tunnel

    CN109209389A