Construction method for reconstructing steel truss arch bridge by using existing bridge

By utilizing existing bridges as construction platforms and combining tie beam hook fixing and construction support technology, a new steel truss arch bridge was built using the method of beams first and arches later. This solved the problems of insufficient auxiliary function and high construction costs of the old bridge, and achieved efficient and stable arch beam installation and low-cost reconstruction.

CN117026849BActive Publication Date: 2026-04-07ZHEJIANG COMM CONSTR GRP CO LTD
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Patent Information

Application Number
CN202311156083.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-08
Publication Date
2026-04-07
Estimated Expiration
2043-09-08

AI Technical Summary

Technical Problem

In existing technologies, old bridges cannot play an auxiliary role in the reconstruction of new bridges. The construction of steel truss arch bridges requires high load-bearing capacity, and the construction efficiency is low and the cost is high, which cannot meet the reconstruction needs of inland waterways with low navigation capacity.

Method used

Using the existing bridge as a construction platform, the project employed temporary fixing technology with tie beams and hooks, construction scaffolding, and simultaneous dismantling and construction of crossbeams. The arch bridge was constructed through in-situ hoisting and a beam-first-arch-later approach. Finite element analysis was used to optimize the construction steps and scaffolding positions, ensuring the stability and efficiency of the old bridge in the construction of the new bridge.

Benefits of technology

It realizes the function of the old bridge as a construction passage and traffic maintenance passage, improves construction efficiency, reduces costs, ensures the installation stability of the arch beams, conforms to the construction concept of green, environmental protection and saving, and is suitable for large-span steel truss arch bridges.

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Abstract

The application relates to a construction method for reconstructing a steel truss arch bridge by using an existing bridge, which comprises the following steps: after the completion of the closure of the side span steel truss arch, the lower support, the side beam, the upper support and the end section of the main span steel truss arch are sequentially erected from bottom to top on the side of the side span steel truss arch close to the main span; after the erection of the bridge deck support with the overhanging cantilever on the deck of the old bridge, the section of the middle beam is erected to the closure opening through the overhanging cantilever, the section is positioned, the closure of the beam is completed; the middle section of the main span steel truss arch is erected on the upper support and the bridge deck support, and the closure of the main span steel truss arch is completed; the temporary wind brace is installed, the sling is installed, the upper support and the bridge deck support are removed, the sling is tensioned, and the lower support is removed; the deck of the old bridge is cut and the cross beam is installed according to the sequence from the middle span to the side span, and the bridge deck is installed. The application has the advantages of ensuring the installation stability of the arch beam, improving the construction efficiency and reducing the construction cost.
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