Flue fireproof plate structure suitable for unlined tunnel

By using a combination structure of corrugated steel plates and cast-in-place concrete partitions in unlined tunnels, the problems of construction interference and fire prevention of traditional flue partitions have been solved, achieving rapid installation and improved fire resistance, and adapting to irregular tunnel walls.

CN224282697UActive Publication Date: 2026-05-26POWERCHINA HUADONG ENG CORP LTD
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Patent Information

Application Number
CN202521030545.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-23
Publication Date
2026-05-26
Estimated Expiration
2035-05-23

AI Technical Summary

Technical Problem

In existing technologies, traditional flue baffle structures cannot be constructed simultaneously with unlined tunnels, resulting in extended construction periods, increased construction interference, and failure to meet the requirements for high-temperature flues and passage. Furthermore, the connection method between the steel beams and the tunnel walls is not suitable for uneven tunnel walls and cannot meet fire protection requirements.

Method used

The structure adopts a combination of corrugated steel plates and cast-in-place concrete partitions, which are anchored to the tunnel wall by rock bolts, and the gaps are filled with non-shrink grout. The frame structure is used for connection, and the exposed steel components are sprayed with fireproof mortar to meet the fire resistance requirements.

Benefits of technology

It enables the rapid installation of flue baffles in unlined tunnels, reduces construction interference, meets fire protection requirements, adapts to irregular tunnel walls, and reduces construction complexity and cost.

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Abstract

The utility model provides a flue fireproof plate structure suitable for a lining-free tunnel, which comprises a partition plate structure erected above the inside of the tunnel, both sides of the partition plate structure are connected with the wall of the tunnel through supporting structures, and gaps between the supporting structures and the wall of a lining-free section in the tunnel are filled with non-shrinkage grouting materials. The partition plate structure comprises a corrugated steel plate and a cast-in-place concrete partition plate, the cast-in-place concrete partition plate is poured on the upper surface of the corrugated steel plate, and the corrugated steel plate serves as a bottom force bearing layer of the cast-in-place concrete partition plate in the construction period. The device is suitable for the unlined tunnel, and construction interference can be reduced to the maximum extent.
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