Segment assembled type combined highway and railway cable-stayed bridge with inconsistent bridge deck widths of highway and railway

Abstract

The invention relates to a girder type of a segment assembled type combined highway and railway cable-stayed bridge with inconsistent bridge deck widths of a highway and a railway. A girder is composed of a main truss, an auxiliary truss, a highway bridge face and a railway bridge face. The upper-layer bridge face is wide, the lower-layer bridge face is narrow, the width of the main truss is determined by the railway bridge face, and the width of the auxiliary truss is determined by the highway bridge face. Supporting rods for supporting the highway bridge face on the two sides are arranged on a main truss bottom chord in a suspension mode. Auxiliary truss upper chords and the supporting rods form the auxiliary truss together. Stay cables are anchored on the auxiliary truss upper chords through anchor tensile plates. The highway bridge face is welded to main truss upper chords and the auxiliary truss upper chords. The railway bridge face is welded to main truss bottom chords. The upper ends and the lower ends of flange plates of the auxiliary truss supporting rods are welded to the auxiliary truss upper chords and the main truss bottom chords respectively. Web plates of the auxiliary truss upper chords and the flange plates of the auxiliary truss supporting rods are identical in inclined angle. The segment assembled type combined highway and railway cable-stayed bridge with the inconsistent bridge deck widths of the highway and the railway is simple in structure, economical in manufacturing cost and clear and direct in stress, is manufactured by welding whole segments in a factory, and is assembled and erected through the whole segments on a construction site, the construction difficulty in the severe environment of straits is greatly lowered, and the bridge is adopted in the combined highway and railway cable-stayed bridge of the Pingtan strait.

Description

technical field [0001] The invention relates to a main girder of a segmentally spliced ​​road-rail dual-purpose cable-stayed bridge with different bridge deck widths for road and rail. Background technique [0002] Although the deck width of the traditional road-rail dual-purpose bridge is wider than that of the road deck, the width difference is not much different. It can be realized by the structural form of the inclined main truss, the upper chord belt cantilever, and the widening of the lower deck. However, for bridges with wider highway decks and narrower railway decks, it is difficult to realize them with traditional structures. The traditional steel truss girder is manufactured in the factory with a single member, and the construction site is assembled one by one. The workload on site is heavy, and the construction period is affected by natural conditions. [0003] Fujian Fuping Railway Pingtan Strait Road-Railway Bridge is a road-railway dual-purpose cable-stayed br...

AI Technical Summary

Problems solved by technology

If the inclined main truss is adopted, the inclination angle of the main truss will reach 55 degrees, which is very unfavorable to the structural stress and structural treatment; if the form of the upper chord with cantilever is adopted, the length of the cantilever will reach 12m, and the stay cables can only be installed at At the end of the cantilever, its rigidity and force cannot meet the requirements of use; if the lower bridge deck is widened, the amount of work will be greatly increased, which is not economical

[0004] The location of the Pingtan Bridge is always windy and rough. If the traditional steel truss structure is used and assembled one by one, the construction period cannot be guaranteed due to the limitation of the site conditions.

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