Novel stiffening structure of super-large box-shaped compression member of steel bridge and construction method thereof

Abstract

The invention relates to a novel stiffening structure of super-large box-shaped compression member of a steel bridge and a construction method thereof, a stiffening rib is additionally arranged outside the box-shaped section of a large member, and landscape structure design is adopted to the appearance of the stiffening rib. When in construction, the compression member is divided into sections, manufactured in steps and installed as follows: manufacturing a plate unit, assembling the box-shaped member by taking the plate unit as the reference, manufacturing the bolt row hole, performing trial assembly and anticorrosive coating on all sections of the member on a preset trial assembly platform, assembling all sections of the member in place according to the assembly sequence at a construction site. In the invention, a stiffening rib additionally arranged to improve the bearing capacity of the member; the assembly area is obviously increased; the row number of splice bolts and the use of splice bars are reduced; the construction is simple and the operation efficiency is high. The landscape decorative structure is adopted to the external stiffening rib, and the design of a large vertical bar is enriched, thereby satisfying the stress demand and beautifying the bridge landscape. The stiffening structure is successfully applied to the Dongjiang double-deck highway project in Guangdong, and the bridge is successfully closed to be opened into operation.

Description

technical field [0001] The invention relates to an innovative design and construction method for a box-shaped extra-large pressure bar of a steel bridge. Background technique [0002] Guangdong Dongjiang Bridge is the first super-large double-layer highway bridge in China, with a main span of 208 meters. The bridge adopts a rigid suspension cable-stiffened steel truss structure, and a total of 14 road lanes are arranged. Concrete bridge deck structure supported by longitudinal and transverse beams. Therefore, this bridge dead load, live load are huge, especially big vertical bar 3 (seeing Figure 5 ) is subjected to excessive pressure, and the conventional box-shaped compression rod is difficult to meet the requirements of the bearing capacity of the rod. [0003] The conventional vertical bars of the existing steel truss girder bridge adopt a box-shaped section, and the width of the main truss members is uniform. Due to the limitation of uniform width, for long compressio...

AI Technical Summary

Problems solved by technology

Due to the limitation of the uniform width, for long compression bars such as the large vertical bars of the Dongjiang Bridge, the compression stability reduction coefficient in the conventional width direction is small, which cannot meet the force requirements of the large vertical bars of the Dongjiang Bridge

If the width of the member is increased, the width of other associated main truss members will increase, which will increase the project cost; if the size of the member in the height direction is increased, the difference in the height and width directions of the member will be large, which is different from The gusset plates connected to each other have a large size and the secondary stress of the joints increases, which is unfavorable to the force

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