Overpass existing line steel box girder structure and construction method

Abstract

The invention relates to an overpass existing line steel box girder structure and a construction method. According to the scheme, the overpass existing line steel box girder structure comprises a steel box girder, an adjusting steel cylinder, double I-shaped steel, a lattice type support and an embedded steel plate which are sequentially arranged from top to bottom. The top of the adjusting steel cylinder supports the steel box girder through a steel cylinder supporting plate, the bottom of the adjusting steel cylinder is fixedly connected with the double-spliced I-shaped steel, and elevation adjustment of the steel box girder can be achieved by adjusting the height of the adjusting steel cylinder. The double-spliced I-shaped steel abuts against the top of the lattice type support. The bottom of the lattice type support and the embedded steel plate are fixed through a connecting piece. The embedded steel plate is arranged in the concrete foundation; Cloth bags are arranged on the left side and the right side of the bottom of the lattice type support, and each cloth bag is filled with fine sand. According to the method, a vehicle can be prevented from directly impacting the temporary steel pipe support system, the construction speed of the temporary steel pipe support system is high, the elevation adjustment error of a steel box girder is small, and the temporary steel pipe support system is safe; and the method has the advantage of better economic and technical benefits.

Description

technical field [0001] The invention relates to the field of construction technology, in particular to a steel box girder structure and construction method spanning an existing line. Background technique [0002] Steel box girder bridges have high flexural and torsional rigidity, light weight, and short construction period. In recent years, due to the needs of construction of viaducts, high-speed ramp bridges, and overpasses, steel box girder main girder structures have been widely used. Considering the small impact on the road traffic under the bridge, the short construction period, the high construction organization requirements and the rationality of the pier layout, the steel box girder with strong spanning ability, fast processing speed, convenient installation and maintenance, and light and beautiful appearance often becomes the best choice. preferred. [0003] However, the following problems exist in the construction process of the existing steel box girder structure...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the large welding workload of the temporary support system, the construction efficiency is low, which seriously affects the progress of the project;

[0005] (2) The temporary support system on both sides of the roadway is greatly affected by the vehicle, and collisions often occur, causing serious safety hazards;

[0006] (3) The elevation of the steel box girder at the top of the beam cannot be adjusted accurately, and the working error is large;

[0007] (4) When the temporary support system is removed, because the feet need to be equipped with dumping limit devices, the construction is inconvenient, which seriously affects the removal efficiency of the support

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