Prefabricated Highway Steel Bridge

Abstract

The invention discloses an assembly type road steel bridge and a truss of the assembly type road steel bridge. The truss is formed in the mode of connecting and combining truss units, and each truss unit is in an isosceles triangle shape and provided with a truss chord member, truss diagonal members and a truss vertical member, wherein the truss chord member serves as the bottom edge of the isosceles triangle, the truss diagonal members serve as the isosceles edges of the isosceles triangle, and the truss vertical member is connected with the vertex and the midpoint of the bottom edge of the isosceles triangle. By the adoption of the truss, the assembly type road steel bridge has the advantages of being simple in structure, definite in stress, high in interchangeability, diverse in combing mode and high in erecting speed and having a few components, can be used in temporary facilities such as rescue and relief facilities, military defense facilities and construction supports and further can be used in permanent structures for conventional highway bridge construction, bridge reinforcement and the like.

Description

technical field [0001] The invention belongs to the technical field of highway bridges, and relates to an assembled highway steel bridge and a temporary / permanent support for engineering construction. Background technique [0002] The prefabricated highway steel bridge is a standard bridge composed of prefabricated metal components that can be disassembled and quickly erected. In 1938, British engineer Donald Bailey designed the earliest fabricated steel bridge, the Bailey Bridge, which was widely used in Europe and the Far East during World War II. After the war, all countries in the world designed similar prefabricated highway steel bridges based on the Bailey Bridge and combined with their own actual conditions, and converted them for civilian use. Since the development and production of the 321-type assembled highway steel bridge in the early 1960s, my country has also developed HD200, ZB200, ZB450 and CD-type assembled highway steel bridges. [0003] Type 321, HD200, ...

AI Technical Summary

Problems solved by technology

[0003] Type 321, HD200, ZB200, and ZB450 are all pin-jointed, so they can only be used as temporary bridges. For example, the HD200 prefabricated road steel bridge adopts a rectangular truss unit, and two diamond-shaped supports are formed by oblique rods. The structure is complex , and the rectangular truss units are connected by pins, which is a temporary bridge structure

In previous earthquake disasters in my country, bridges with a span of more than 60 meters in wide rivers were destroyed. Therefore, the spanning capacity of the 321-type, HD200, and ZB200 steel bridges cannot meet the demand; although the span of the ZB450-type steel bridge can be Up to 81 meters, but the erection and installation need to rely on mechanical equipment, and the erection time is long, and it cannot meet the needs of emergency rescue and emergency repairs

[0004] Comparing the spanning capacity, erection speed and construction method comprehensively, the CD-shaped steel bridge is improved compared with the previous four models, but the beam of the CD-shaped steel bridge is set between two truss units. The edge is cut off and inserted between the two truss units, and the beam and the truss are connected by bolts. The construction is difficult, the bolt holes are not easy to align, and the beam is placed between the two trusses. The force transmission path of the truss is not clear, which is not conducive to the truss. Stress situation analysis, and the lower chord of the CD-shaped steel bridge is prone to local instability during the erection process. This bridge type is only a theoretical permanent bridge. Indicator requirements

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