Jindong Bridge: Suspension Bridge with Steel Truss Girder and Prefabricated RC Deck Slabs in China

Abstract

The Jindong Bridge, crossing the Jinsha River in Yunan Province, China, is a suspension bridge with a main span of 730 m. In this paper, the design and construction of this bridge are introduced. Both tunnel-type and gravity-type anchorages were applied. For installations of main cable strands, the relative altitude difference method was used based on quantified interstrand distances to guarantee sufficient accuracy. In the erection of steel truss girder, segments were connected by temporary hinges. During the installation of RC deck slabs, temporary hinges of girder segments were converted into permanent rigid connections at appropriate moments, which were determined by calculation; half deck slabs were installed symmetrically from both girder ends to the midspan to generate a channel and the rest deck slab was installed in opposite direction. These structural components and construction technologies, as discussed in this paper, represent a suitable choice for other suspension bridges in mountainous areas.

An analytical algorithm for the pylon saddle pushing stage and distance during the suspension bridge construction

“…The analytical algorithm viability was proved by its application to the particular case, namely, the Jindong Bridge, which is a suspension bridge with the longest span across the Jinsha River in Yunnan Province of China (Zhang et al, 2018a). The bridge is spanned as 240 m + 730 m + 120 m, as seen in Figure 7.…”

“…The bridge deck is made from 4.96 m-long, 1.70 m-wide, and 0.16 m-thick precast concrete slabs. The slab deck and longitudinal beams are fastened by shear pins (Zhang et al, 2018a).…”

“…Steel truss girder and bridge floor system of the Jindong Bridge, China: (a) 3D view (Zhang et al, 2018a); (b) cross-section (Unit: mm).…”

“…During the installation of RC deck slabs, temporary hinges of girder segments were replaced by permanent rigid connections at appropriate instances. Half-deck slabs were installed symmetrically from both girder-ends to the midspan point to generate a channel, while the remaining deck slabs were installed in the opposite direction (Zhang et al, 2018a), as shown in Figure 10.…”

An iterative calculation method for hanger tensions and the cable shape of a suspension bridge based on the catenary theory and finite element method

“…It is noteworthy that the proposed method and the respective calculation results were successfully Figure 9. Steel truss girder and bridge floor system (Zhang et al, 2018a). implemented in the design and construction of the Jindong Bridge, which ensured its improved cable geometry.…”