Box type web simply supported U-shaped girder of double-track railway

Abstract

The invention discloses a box type web simply supported U-shaped girder of a double-track railway. The box type web simply supported U-shaped girder comprises a roadbed slab; a set of edge box girders is symmetrically arranged at two side end parts of the width direction of the roadbed slab; end cross beams are arranged at two end bottoms of the length direction of the roadbed slab; the roadbed slab is provided with multiple weep holes at intervals in the length direction; the edge box girders extend out from two sides of the roadbed slab, and are hollow cavity structures; multiple first longitudinal prestressed tendons parallel to the length direction of the roadbed slab and multiple transverse prestressed tendons parallel to the width direction of the roadbed slab are arranged in the roadbed slab and a baseplate; multiple second longitudinal prestressed tendons parallel to the length direction of the roadbed slab are arranged in the side walls of the hollow cavities; and multiple vertical prestressed tendons are arranged in the side walls of the hollow cavities at intervals. The box type web simply supported U-shaped girder is higher in torsion resistance and horizontal resistance, is excellent in all beam stress level, has no web splitting problem, needs no additional powerful web stiffening ribs, is simple in structure, and can reach maximum horizontal width.

Description

technical field [0001] The invention relates to a railway bridge, in particular to a double-track railway box-shaped web simply supported trough beam. Background technique [0002] The existing double-line channel beam structure has the following three forms: [0003] 1. Single-web trough-shaped beam: At present, only one-hole 20m-span double-line prestressed concrete trough-shaped beam built on the Beijing-Chengdu railway line adopts the I-type single-web edge main beam structure, and a three-way prestressing system is set up. The width of the bridge deck (clear distance between side main beams) is 9.58m. Due to the adoption of the I-type single-web side main girder structure, the width of the bridge deck is difficult to continue to widen, the I-type single-web side main beam has insufficient torsion resistance, and the structural stress state is poor. In addition, the flange width on the I-type single web is small, the bending rigidity of the structure is small, and the ...

AI Technical Summary

Problems solved by technology

Therefore, the line spacing between the approach bridges at both ends and the roadbed is increased, and the overall engineering volume is increased. When the groove beam layout range is not long, the economy is poor

In addition, the larger the span, the larger the space occupied by the middle web, and the larger the artificial widening of the line spacing, so it is generally only applicable to small spans of about 16m

[0007]

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