Public iron layered steel box girder

Abstract

The invention discloses a highway and railway layered steel box beam. The highway and railway layered steel box beam comprises a box beam top board and a box beam bottom board, wherein the box beam bottom board is located below the middle portion of the box beam top board, a supporting structure is arranged between the box beam top board and the box beam bottom board and is of a truss-type box structure, edge webs which extend in the vertical direction are arranged at the two transverse ends of the box beam top board, an edge bottom board is arranged between the lower end of each edge web and the end portion of the same side of the box beam bottom board, and an inverted-trapezoidal box cavity is defined by the box beam top board, the edge webs, the edge bottom boards and the box beam bottom board. On the basis of a conventional steel box beam, the height of the section is increased, and a railway can be arranged inside the steel box beam; the supporting structure between the box beam top board and the box beam bottom board is of the truss-type box structure, and compared with an integrated type steel box beam, the highway and railway layered steel box beam saves rolled steel.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a road-rail layered steel box girder. Background technique [0002] Highway long-span bridges mainly use steel box girders, which have the characteristics of less steel consumption, high torsional rigidity, and good wind resistance, but they are not used in the layered layout of highways and railways. At present, steel truss girders are used in the long-span bridges with layered layout for road and railway. Although the technology of steel truss girders is mature, there are still the following imperfections: [0003] 1. Due to factors such as node structure, many spliced ​​plates, weakened bolt holes, and large slenderness ratio of rods, the material utilization rate of steel truss girders is not high, and the amount of steel used is large. [0004] 2. The steel truss girder has a large overall section height, many rods, a large wind resistance coefficient, and the b...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to factors such as joint structure, many spliced ​​plates, weakened bolt holes, and large slenderness ratio of rods, the material utilization rate of steel truss beams is not high, and the steel consumption is large

[0004] 2. The steel truss girder has a large overall section height, many rods, a large wind resistance coefficient, and the blunt body section has poor wind resistance performance. In coastal typhoon-prone areas, the train's driving wind speed threshold is relatively low.

[0005] 3. There are many steel truss girder members. Although the transportation and hoisting are convenient, the splicing construction of the entire segment is difficult, while the splicing construction progress of a single member is slow and requires high construction accuracy.

[0006] 4. It is difficult to design a concrete structure that matches the truss structure, so that the side span cannot use the structural form of a composite beam to save steel consumption, and the cost is high for a long time

Images