Long-span Steel Truss Arch Bridge Construction and Innovation

摘要

The new bridge under construction in Zhuhai, China, is a dominant project of Jinding-Gaolan road,rnwhich is the vital communication line throughout Zhuhai. The superstructure of main bridge isrn100m + 400m + 100m steel truss tied-arch bridge. The bridge is assembled symmetrically from sidernspan to middle span. Except for 1# segment and 2# segment of side span assembled by truckrncrane, all the other truss segments are assembled by 80t girder erection crane using cantileverrnerection method. Cable-stayed system is adopted to help mid-span arch erection and ensurernsafety during the whole process. After arch closure, rigid tie bar segments of mid-span can bernerected by deck derrick crane. Instead of temporary flexibility tie bar, temporary locked bearingrnhas been invented to resistant horizontal force at arch springer during rigid tie bar construction, sornas to satisfy navigation requirement of first grade waterway at worksite.