5 m steel track girder for Xiejiawan Overpass of the first phase project of Line 2 of Chongqing light rail because it is the first application of straddled type monorail in China with new technology,big difficulty and high design requirement.

With the background of track beams adopted in Chongqing straddle single-track transit systems, dynamic behavior of steel-concrete composite simple-supported track beam is discussed in this paper.

In this article,authors emphasize the construction and detection method of cement mixing pile composite foundation under track beam basement.

An introduction is given to erection technology for track beam over busy trunk road, by means of centering and tray rolling rod method for longitudinal and lateral movement.

The full-scale fatigue test of the connection structural details between track cross beams and monolithic joints in the Chongqing Caiyuanba Yangtze-river Bridge,the first long-span rail-cum-road bridge in China,is introduced.

This paper describes several treatment methods for foundation of rail bearer of wharf gantry crane,and puts forward some suggestions for design and construction,so as to shorten the maintenance period of gantry crane rail bearer,and ensure good performance of equipments.

The construction and detection method of cement mixing pile uner the foundation of rail bearer are emphatically introduced in the paper.

According to the calculation results of 30 kinds of reinforced concrete rail bearer and 70 kinds of pretensioned rail bearer for high pile wharf,the studies on the relation between the height of rail bearer and the space of pile bent,the location of resul.