parameters for rhombic bracket of high-speed railway
No.	Standards	Span	Name of the project	Remarks
1	GB50017—2003	65+112+65m（straight, bent）	Middle and southern cargo railway in Shanxi Province	Triangle bracket
2	GB50017—2003	32+48+ 32m （straight, bent）	Wuguang passenger railway, designed speed: 300km/h	Rhombic bracket
3	GB50017—2003	40+56+ 40m （straight, bent）	Wuguang passenger railway, designed speed: 350km/h	Rhombic bracket
4	GB50017—2003	40+64+ 40m （straight, bent）	Jinghu  passenger high-speed railway, designed speed: 350km/h	Rhombic bracket
5	GB50017—2003	48+80+ 48m （straight, bent）	Jinghu  passenger high-speed railway, and Baoxi Railway. Designed speed: 350km/h.	Rhombic bracket
6	GB50017—2003	70+125+70m （straight, bent）	Guangshen passenger railway, designed speed: 300km/h.	Rhombic bracket
7	GB50017—2003	112+200+112m	Yangjialing bridge in Zhongdian Express Way	Rhombic bracket

　　As the main equipment for boom construction, bracket can be clarified as truss bracket (including flat none balanced weight, rhombic, triangle, and bowstring), cable-stayed bracket (including the Diagonal Triangle and pre-stressed cable-stayed), shaped steel bracket and comprehensive bracket. According to the design of the project and the requirement for construction, we recommend rhombic bracket among those main kinds of brackets, which enjoys simple structure, easy assemble, free of the road and easy for operation. In this way, the bridged can be constructed 2 to 4 meters once a time with out the breakdown of the road. After the constructed cement of the bridge has been hardened enough, the bracket can be push forward by the hydraulic equipment for the next construction area. 
　　The rhombic bracket designed and fabricate by the company includes the following: main truss frame, suspension system, fixing system, moving system and bottom framework. The whole systems enjoy characteristics of light weight, simple structure, stable and huge load, easy to move and assemble or dissemble, reusable for most of the parts, miner torture upon big press, enough space beneath the bracket for construction, etc.
    The bracket designed and fabricated in the company has already applied in most important projects in high-speed railway, such as Jinghu high-speed railway, Guangshen Port, Wuguang railway, Shiwu railway, 308 high-speed way, Pingyu express way, Baoxi railway, Zhongdian express way, Jinghu high-speed railway, Ninghang passenger railway, etc. and also, Zhongnan bridge, Ningqi railway, Ningan railway, Daxing railway are under construction now.

包西铁路挂蓝(48+64+48m)