Installation and positioning method of steel box girder arc U-rib

Abstract

The invention provides a steel box girder arc-shaped U rib installing and positioning method. The method comprises the steps that a line drawing working platform is arranged in an area where a U rib of a steel box girder needs to be installed, and line drawing is conducted in a mode from the center to the two sides after leveling is conducted; stiffening plates are welded to the inner surface of the U rib at intervals; the U rib is installed from one end of a well-drawn approximate curve to the other end of the approximate curve; when installation is conducted, support plates and wedge blocks are used for fixing the U rib, a steel hammer is used for hammering, the U rib is bent towards one side, after the U rib is overlapped with a current straight-line segment, point welding is conducted to fix the overlapped portions of the U rib and the straight-line segment, and installation is continuously conducted to enable the U rib to be overlapped with a next straight-line segment till the U rib is completely overlapped with the approximate curve; the support plates and the wedge blocks are removed; the steel box girder which is well provided with the U rib is placed on an in-plant anti-deformation jig frame for whole welding. According to the steel box girder arc-shaped U rib installing and positioning method, the straight-line fitting circular-arc curve serves as the basic principle, full cross-section heating does not need to be conducted on the whole U rib at certain intervals, and installation of the arc-shaped U rib can be completed conveniently and rapidly.

Description

technical field [0001] The invention belongs to the field of construction and installation of steel box girders, and in particular relates to a method for installing and locating curved U-ribs of steel box girders. Background technique [0002] Since the bridge deck is a component that directly bears the load of the vehicle, the minimum thickness of the roof is calculated according to the American code to be 12mm (16mm for the L22 link, 24mm and 28mm for the pier), and U-shaped stiffeners are used for stiffening. The weld between the U-rib and the top plate works under extremely complex alternating stress conditions, and the minimum width of a single wheel on the ground is about 300mm (see the general specification for bridge and culvert design for heavy-duty vehicles). Therefore, in order to reduce the deformation of the top plate in the transverse bridge direction, Considering the design, the U-rib is designed to have a width of 300 mm at the top and a spacing of 600 mm. ...

AI Technical Summary

Problems solved by technology

If all the U ribs are bent according to the traditional method, it will not only consume a lot of manpower and material resources, but it will also be difficult to meet the requirements of the construction period

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