Multi-point floating incremental launching construction system of large-span steel truss girder bridge

Abstract

The invention discloses a multi-point floating incremental launching construction system of a large-span steel truss girder bridge. The system is used for incremental launching the steel truss girderbridge to corresponding two piers, a construction system comprises a floating supporting device, a sliding rail and a synchronous incremental launching system, the floating supporting device is located on the water surface between the two piers, the floating supporting device supports the bottom of the front side of the steel truss girder bridge, the sliding rail is arranged on the piers at the starting position of the steel truss girder bridge in the longitudinal bridge direction, and the synchronous incremental launching system is arranged on the sliding rail and supports and incrementally launches the steel truss girder bridge. The multi-point floating incremental launching construction system has the advantages of being simple in structure, reasonable in design, simple and convenient to construct and low in investment cost; a multi-point floating support is adopted, so that the stability of erecting the large-span bridge can be guaranteed; a special-designed incremental launching system is adopted, the steel truss girder bridge is supported on a load trolley, the load trolley is limited on the steel rail, the deflection in the incremental launching process can be well limited by the incremental launching through the sliding rail while the bearing capacity is guaranteed, and the adopted floating supporting device is flexible in floating and the sinking operations.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a multi-point floating support jacking construction system for a long-span steel truss bridge. Background technique [0002] For bridges spanning important navigable waterways, it is generally required to affect river navigation as little as possible. Therefore, it is a reasonable design to adopt floating temporary supports instead of fixed piers in the river in the erection scheme. However, for bridges with large spans, the overturning stability generally needs to be considered, so a construction scheme with multi-point floating supports is required. [0003] Chinese patent CN 106120565 A discloses a large-span eccentric leaning type steel box tie rod arch bridge floating bracket construction system. It includes a sliding system for the support and longitudinal sliding of the bridge superstructure, a mobile support device for supporting the front side of...

AI Technical Summary

Problems solved by technology

The superstructure of the bridge to be erected in this patent is temporarily supported by floating piers and erected by hoist traction, but the front end is supported by a single-point floating support, and the related technology of multi-point floating support erection is not given.

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