A method for excavating a plant underground cavern and a plant underground cavern

By creating a construction adit on the upstream side of the bottom of the main transformer tunnel, and using this adit to construct in parallel with the main powerhouse, the problem of the busbar tunnel construction being constrained by the excavation elevation of the main powerhouse was solved, and the parallel construction of the busbar tunnel and the main powerhouse was realized, thus improving the overall construction efficiency of the underground caverns of the powerhouse.

CN122236482APending Publication Date: 2026-06-19NORTHWEST ENGINEERING CORPORATION LIMITED
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWEST ENGINEERING CORPORATION LIMITED
Filing Date
2026-05-13
Publication Date
2026-06-19

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Abstract

This invention provides a method for excavating an underground cavern in a power plant and the underground cavern itself, relating to the field of hydraulic engineering technology. The underground cavern includes a main transformer tunnel, a main power plant, and a busbar tunnel, with the busbar tunnel connecting the main transformer tunnel and the main power plant. The underground cavern also includes a construction adit. The excavation method for the underground cavern includes the following steps: excavation work is carried out on the upstream side of the bottom of the main transformer tunnel to form a construction adit; at least part of the excavation work of the busbar tunnel is carried out through the construction adit in parallel with at least part of the excavation work of the main power plant; the busbar tunnel and the main power plant are excavated to connect, and the intersection area of ​​the busbar tunnel and the main power plant is reinforced with support. This invention can effectively improve the overall construction progress and efficiency of the underground cavern.
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