Deflection early warning control and correction method for cantilever casting bridge with large-span continuous beam using hanging basket

By monitoring the elongation of the slings and adjusting the concrete pouring speed, hanging basket height and prestressing time, the problem of unstable bridge deflection warning caused by over-tight installation of the slings was solved, thereby improving the safety and quality of bridge construction.

CN120505877BActive Publication Date: 2025-09-19THE FIRST ENGINEERING COMPANY OF CCCC FOURTH HARBOUR ENGINEERING CO LTD +1
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Patent Information

Application Number
CN202510991320.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-18
Publication Date
2025-09-19
Estimated Expiration
2045-07-18

AI Technical Summary

Technical Problem

In the prior art, due to the over-tight installation of the slings, the stability of the bridge deflection warning control during the cantilever casting process of the hanging basket is reduced, affecting the safety of the bridge construction and the quality of the completed bridge.

Method used

By monitoring the elongation of the sling, adjusting the concrete pouring speed, the vertical height of the hanging basket and the prestressing time, the stability of the bridge deflection warning is ensured, including reducing the concrete pouring speed, increasing the hanging basket height and extending the prestressing time to compensate for the prestress loss.

Benefits of technology

It improves the control stability of bridge deflection early warning, enhances the crack resistance and bearing capacity of the bridge structure, and ensures construction safety and quality.

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Abstract

The present invention relates to the technical field of bridge deflection warning, and in particular to a method for controlling and correcting the deflection of a large-span continuous beam cantilever-casting bridge using a hanging basket. The method comprises: using a sling to lift the hanging basket to the bridge cantilever and assemble and fix it, sequentially installing the beam section formwork, tying the steel bars, installing the prestressed pipe, and pouring concrete; installing a deflection sensor and issuing an alarm when the deflection exceeds a set threshold; determining the control stability of the bridge deflection warning based on the difference in the sling elongation during concrete pouring and before pouring; adjusting the concrete pouring speed if the control stability does not meet the requirements; curing the concrete after pouring and inserting the prestressed anchor bundle, sequentially performing the prestressed bundle tensioning and pipe grouting operations, and removing the hanging basket after the bridge cantilever closure at both ends; and adjusting the prestressing tensioning duration based on the grouting fullness in the pipe. The present invention improves the control stability of the bridge deflection warning.
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