A fireproof board structure for flues in unlined tunnels

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

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
POWERCHINA HUADONG ENG CORP LTD
Filing Date
2025-05-23
Publication Date
2026-05-26

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.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a fireproof flue structure suitable for unlined tunnels, comprising a partition structure erected above the tunnel interior. Both sides of the partition structure are connected to the tunnel wall via supporting structures. The gap between the supporting structures and the unlined section of the tunnel wall is filled with non-shrink grout. The partition structure includes a corrugated steel plate and a cast-in-place concrete partition. The cast-in-place concrete partition is poured onto the upper surface of the corrugated steel plate, serving as the bottom load-bearing layer of the cast-in-place concrete partition during construction. This invention is applicable to unlined tunnels and can minimize construction interference.
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