Bridge construction process adopting all-welded integral joint steel pipe truss chord member prefabricated unit

Abstract

The invention discloses a bridge construction process adopting an all-welded integral joint steel pipe truss chord member prefabricated unit. The process comprises the following steps: constructing alower structure for supporting the upper structure of a trussed structure bridge; then prefabricating a main truss structure in a factory, wherein the main truss structure comprises chord member sections, web members and longitudinal and transverse link members; according to stress analysis, determining the chord member sections containing nodes, the web members and the cutting positions of longitudinal and transverse link members; cutting into multiple sections of truss rod pieces; transporting each section of truss rod piece to a construction site; assembling the truss rod pieces into trusssections; sequentially erecting the truss sections on the lower structure; connecting and assembling to form a main truss structure; and finally paving a bridge floor to finish the construction of thewhole bridge. The construction process is simple, convenient to process, manufacture and transport, less limited by the external construction environment and suitable for construction under various construction conditions; prefabricated sections are few, the on-site connection workload is small, and the process is suitable for rapid bridge construction; and the process is suitable for construction of various trussed structure bridges.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a bridge construction process using prefabricated units of steel pipe truss chords with fully welded integral nodes. Background technique [0002] With the vigorous promotion of steel structure and composite structure bridge construction in our country, truss structure has been widely used in bridge engineering because of its excellent mechanical properties, high bearing efficiency and convenient construction. At present, truss structures are developed in various forms. According to the different layout forms of webs, they can be divided into triangular trusses, monoclinic trusses, diamond-shaped web trusses, and K-shaped web trusses. The truss meets the mechanical performance requirements of different spans by adopting different truss forms, changing the beam height, changing the section size, filling concrete in the rods, and setting a perforated hole stiffener (Per...

AI Technical Summary

Problems solved by technology

The spliced ​​joint is to install a gusset plate on the outside of the bar, and use bolts to make the gusset plate and the bar close to each other, so as to realize the connection between the bar. This type of joint has a simple structure and is easy to assemble, but the assembly workload is relatively large; The integral joint is to weld the gusset plate and the chord connected to it into a whole in the factory in advance, and then assemble the members on site. The gusset plate also serves as the web of the chord at the node, avoiding the welding seams or bolts at the node The concentration of the joints improves the stress of the joints; the fully welded joints are directly welded to the rods, the structure is simple, the structural integrity is good, and the adaptability to the construction conditions is strong. It is more widely used in the truss structure, but each construction site has The construction conditions are different, the joint quality is difficult to be guaranteed, and it is easy to introduce defects during the welding process, resulting in a large notch stress at the weld position, coupled with the large welding residual stress at the weld, making the joint welding The stress level at the joint is far greater than the nominal stress of the member, which is also a major problem hindering the development of truss structures today.

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