Variable-cross-section template and construction method for variable-cross-section immersed tube

By designing variable-section formwork and construction methods, the problem of insufficient versatility of existing immersed tube formwork is solved, the construction of variable-section immersed tubes is realized, costs are saved and efficiency is improved.

WO2025200252A1 Publication Date: 2025-10-02CCCC FOURTH HARBOR ENG CO LTD +1
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Patent Information

Application Number
PCT/CN2024/113373
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-29
Filing Date
2024-08-20
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

The existing immersed tube formwork structure has a single versatility and is only suitable for the prefabrication of immersed tubes of fixed specifications and models. It is difficult to apply to the casting of immersed tubes with variable cross-sections and cannot meet the construction requirements of immersed tubes with variable cross-sections in urban immersed tube tunnels.

Method used

A variable-section formwork was designed, including an inner formwork system and an outer formwork system. Through the inclined design of the inner and outer formwork systems and the use of compensation blocks, a trumpet-section structure was formed to adapt to the shape requirements of the variable-section immersed tube, and the casting of the variable-section immersed tube was realized through construction steps.

Benefits of technology

The construction of immersed tubes with variable cross-sections is realized, the versatility of the immersed tube templates is improved, construction costs are saved, construction efficiency is improved, and the waste of remaking the templates is avoided.

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Abstract

The present invention relates to the technical field of immersed tube construction, and in particular to a variable-cross-section template and a construction method for a variable-cross-section immersed tube. The variable-cross-section template comprises an inner template system and an outer template system, wherein the inner template system is located inside the outer template system; two outer sides of the inner template system are provided with first inclined faces inclined inwardly toward each other, two inner sides of the outer template system are provided with second inclined faces inclined inwardly toward each other, and each second inclined face corresponds to the first inclined face on the same side; and casting is performed in an area between the inner template system and the outer template system to form an immersed tube. During the casting of the immersed tube, an inclined side wall is provided between each second inclined face and the first inclined face on the same side to form a flared section of the immersed tube, and then the immersed tube enables lane confluence by means of the flared section. The immersed tube is cast by means of the variable-cross-section template of the present application, so that the immersed tube has the flared section, and the variable-cross-section immersed tube is formed, thereby meeting the construction requirements.
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