Author(s)

Bin XIONG, Zhigang Yu, Ming MA, Baohe Zhu, Minghui Zhao

Corresponding Author

Bin XIONG

ABSTRACT

The fifth connection of the main line bridge of the New JiuZhong Road in Chongqing is a continuous steel box girder bridge with a span diameter of (40+49+40)m, which is divided into left and right frames with a total weight of 1535.8t. The steel box girder bridge adopts a single-box single-chamber cross-section form, with a roof width of 9m, a bottom plate width of 5m, a beam height of 2m, a steel box girder roof thickness of 20mm, a bottom plate thickness of 24mm, and a web plate thickness of 24mm. Each frame is divided into 19 steel box girder sections. Because the fifth connection of the main line bridge of the New JiuZhong Road crosses the second line of Chongqing Rail Transit, it intersects vertically. It crosses the viaduct section of Chen Tuo Road on the expressway and intersects vertically. There are existing traffic lines on the upper nine neutral intersections. Therefore, it is designed as a steel box girder and adopts the construction technology of steel box girder top push. In the jacking construction, temporary structures such as assembly temporary piers, jacking temporary piers, steel guide beams, etc. are set up; multi-point synchronous continuous jacking technology is carried out using 650t intelligent stepping equipment; steel box girder jacking technology and steel box girder herringbone slope adjustment technology are used to complete the bridge steel box girder jacking construction. The results show that the push process is stable, and the structural strength of the steel box girder and guide beam meets the requirements of the specification.

KEYWORDS

Bridge across the existing lines, Steel-box girder bridge, Walking-type jacking and pushing, Incremental launching method monstruction