Yan H.-B.,China Railway Science and Industry Group Co. |
Zheng Z.-Y.,China Railway Science and Industry Group Co. |
Huang X.-Y.,China Railway Science and Industry Group Co.
Bridge Construction | Year: 2014
The main bridge of Tongling Changjiang River Rail-cum-Road Bridge is a five-span continuous steel truss girder cable-stayed bridge with span arrangement (90+240+630+240+90) m. The main girder of the bridge is comprised of 3 N-shape main trusses and the trusses are all of the two-panel all-welded truss unit structures. A two-panel truss unit is 30 m long, 2.85 m wide, 18 m high and the heaviest unit weighs 360 t. The truss unit is formed by welding the upper, lower chords and web members. For the manufacturing of the main girder, the techniques of manufacturing the two-panel all-welded truss units and the upper and lower deck plates in blocks in integrity are used. To ensure the manufacturing accuracy of a truss unit, the technique of the "2+1" match manufacturing is used. After a upper chord, lower chord, vertical web member and inclined web member of the unit are manufactured, the unit is then generally assembled. 3 all-welded truss units are manufactured on one jig stand. When the previous two units are manufactured and moved out of the jig stand, the last unit is moved to the front and is used as the parent girder, the successive truss units are continuously match assembled until all units are assembled. Presently, the erection of the truss girder of the bridge has been completed and the manufacturing accuracy of the truss girder can meet the relevant requirements in the codes. Source