product introduction
Steel box girder is composed of top plate, bottom plate, web, transverse partition and longitudinal and transverse stiffeners. Its commonly used cross-sectional forms include single box single room, single box three room, double box single room, three box single room, Multi-box single-chamber, inverted trapezoid with inclined webs, single-box multi-chamber with more than 3 webs, flat steel box girder, etc. Among them, the most widely used steel box girder section is double-box single-chamber, and multi-box single-chamber is used for bridges with larger bridge widths. Flat steel box girder has a small ratio of beam height to beam width, and is mainly used for ribbed beams such as suspension bridges, cable-stayed bridges, and arch bridges. It is rarely used in beam bridges. Single-box multi-chamber steel box girder with more than 3 webs is not easy to manufacture and install, so it is rarely used.
Product advantages
(1) Light weight and material saving. Steel box girder bridges can give full play to the load-bearing capacity of steel, saving about 20% of steel materials compared to steel truss bridges with the same span. After the upper structure becomes lighter, the cost of the lower part will also be reduced.
(2) Bending and torsional rigidity is large. The steel box girder adopts a closed cross section, which can provide greater bending and torsion rigidity than other cross-sectional forms under the same material quality. It is especially suitable for curved bridges and straight steel box girder bridges subject to larger eccentric loads.
(3) Quick installation and easy maintenance. The steel box girder can be made into a large unit in the factory to reduce the workload of site connection and ensure the installation quality and installation accuracy. The chamber is a closed structure with a simple structure, which is convenient for painting, anti-corrosion and rust resistance, and later manual maintenance.
(4) Conducive to improving erection efficiency. With the advancement of large-scale hoisting equipment and erection technology, box girder is suitable for large-segment erection or jacking, which is beneficial to improve the efficiency of erection and shorten the construction period.
Product applications
Because of its structural form, steel box girder is generally used for municipal elevated and ramp steel box girder; construction period traffic organization long-span cable-stayed bridge, suspension bridge, arch bridge stiffening girder and pedestrian bridge steel box girder.
