Staged conversion control method of assembly type stiff support conversion reinforcing system

By using a phased conversion control method for a prefabricated rigid bracing conversion reinforcement system, the problems of insufficient bearing capacity of ordinary steel bracing and large space occupation of large-section concrete bracing in underground structure connection construction were solved. This achieved efficient utilization of construction space and safe conversion, and provided quantitative criteria for bracing conversion.

CN122365690AActive Publication Date: 2026-07-10SHANGHAI CONSTRUCTION FIRST CONSTRUCTION (GROUP) CO LTD +1
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Patent Information

Application Number
CN202610830402.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-10
Publication Date
2026-07-10
Estimated Expiration
2046-06-10

AI Technical Summary

Technical Problem

In the existing underground structure connection construction, the bearing capacity of ordinary steel supports is insufficient, large-section concrete supports occupy a lot of space and are difficult to dismantle, and there is a lack of quantitative criteria for support conversion in the area of ​​deep and large temporary openings, making it difficult to balance construction space and support safety.

Method used

This paper provides a stage transition control method for a prefabricated stiffened brace conversion reinforcement system. By establishing an original support system model, dividing the construction stage, identifying the impact zone of the opening, generating candidate schemes for prefabricated stiffened braces, calculating the stage transition safety factor, optimizing the candidate schemes for stiffened braces, determining the optimal layout scheme, and achieving unified quantitative judgment of bearing capacity, stiffness, deformation, and boundary bearing pressure.

Benefits of technology

This approach achieves the goal of reducing the number of supports while meeting high load-bearing capacity and stiffness requirements, freeing up construction space inside the opening, reducing demolition difficulty, providing green construction and reusability value, and ensuring construction safety and efficiency.

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Abstract

The invention discloses a stage conversion control method for an assembly type stiff support conversion reinforcing system, which comprises the steps of establishing an original support system model, dividing construction stages, identifying a hole influence area, generating an assembly type stiff support candidate scheme, calculating a stage conversion safety coefficient and optimizing the assembly type stiff support candidate scheme. A plurality of common supports needing to be dismantled in the tunnel opening range are replaced by a small number of stiff supports which are high in bearing capacity, high in rigidity and capable of being assembled, and a stage conversion safety coefficient judgment method and a minimum replacement support set optimization algorithm are combined, so that the underground structure is changed from a conventional foundation pit supporting state to a deep and large tunnel opening construction state. Safely converting to a complete basement structure state; the problems that in existing underground structure communication construction, a common steel support is insufficient in bearing capacity, a large-section concrete support is large in occupied space and difficult to dismantle, support conversion in a deep and large hole area lacks quantitative criteria, and construction space and support safety are difficult to consider at the same time are solved.
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