A construction method of all-welded box truss composite segments

Abstract

The invention relates to an all-welded box girder combination section constructing method. The method comprises the specific steps that a girder is divided by making the distance length of two sections serve as one novel box girder combination section, plate units of sectional unit parts are manufactured, a girder lower chord is welded to a lower bridge surface steel box, a girder upper chord is welded to an upper bridge surface panel, a transverse bracing system is welded to a girder vertical rod, the girder vertical rod and an inclined rod are welded to the girder lower chord and the girder upper chord, and the novel box girder combination sections are formed; trial splicing is performed on adjacent novel box girder combination sections on a preset trial assembly platform, and anticorrosion coating is performed on the outer surface. All-welded box girder combinations are welded in place according to a construction order on a bridging construction site. According to the method, the girder is designed into the all-welded box girder combination sections, few hanging units are used, durability of the girder is improved, maintaining workloads during the later period are reduced, site construction is simplified, work efficiency is improved, and an installation period is shortened; the appearance is beautiful, and durability is good. The method has been successfully applied to the Shanghai-to-Nantong railway Yangtze river highway-railway dual-purpose great bridge engineering.

Description

technical field

[0001] The invention relates to a construction method of an all-welded box truss composite segment. Background technique

[0002] For existing steel truss cable-stayed bridges, the construction methods of the main truss mainly include loose assembly, truss erection, and single-section overall erection. These construction methods use a large number of high-strength bolts to connect the site, and the main truss and the bridge deck also use a large number of welds to connect on site. With the increase of the span, the number of main truss members and bridge deck units increases dramatically, and the workload of on-site splicing is huge.

[0003] The Yangtze River Bridge on the Shanghai-Nongtong Railway is located in the coastal area, and severe weather conditions occur from time to time. The Shanghai-Tongjiang Yangtze River Bridge is a major node project on the Shanghai-Tongtong Railway Project. The main bridge is a super-long-span cable-stayed bridge for both...

Images