Key Technology for Rapid Construction of Continuous Beam-Steel Tube Arch Composite Bridge
The continuous beam steel tube arch composite bridge combines the continuous beam and steel tube concrete arch,which has the advantages of strong crossing ability,large overall stiffness,convenient construc-tion,and has better solve requirements of the high-speed traffic on the bridge,widely used in the span of 60～200m railway,highway bridge.However,the structure of continuous rigid steel tube arch composite has com-plex structure,frequent structural system conversion of the bridge,many construction method,complex and changeable process,tight construction period,prominent site safety and coordination difficulties.Aiming at the characteristics of complex structure,multiple system conversion and difficult construction of long-span continu-ous beam arch composite bridge,the construction technology of cast-in-place support of large-span continuous beam combined with hanging basket cantilever is firstly proposed.At the same time,a device and adjustment method which can effectively adjust the load balance in the construction process of concrete continuous beam cantilever is developed,which has strong applicability and operability,and high safety and reliability.In the construction of No.0 block,the implicit reverse tension preloading technology is proposed to replace the tradi-tional explicit overloading technology,which avoids the construction interference in the process of overloading,eliminates the safety hazards in the process of explicit overloading and improves the work efficiency.In the construction of steel tube arch,support piers are set up,and the construction method of steel tube arch installa-tion and laying parallel is put forward,which guarantees the construction period of the whole line.
Long-span continuous beam steel tube arch composite bridgeBalance adjustment device and meth-odImplicit reverse tension preloadingSteel tube arch installation and paving work in parallelConstruction technology
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