Sun J.-J.,Ningan Railway Co.
Bridge Construction | Year: 2014
The main bridge of Anqing Changjiang River Railway Bridge is a continuous steel truss girder cable-stayed bridge with double pylons, triple cable planes and with a main span of 580 m. The main trusses of the bridge are composed of three spatial trusses that are 15.0 m in height and have panel length of 14.5 m and truss spacing of 14.0 m. On the main bridge, there were totally two closure points arranged at the central span and side span and the closure of the bridge proceeded from the central span first and side span late. In the light of the erection status of the steel truss girder of the bridge before the closure of the side span, the characteristics of the closure of the side span were analyzed in details and the various measures for the closure were formulated. The sensitivity analysis of the measures was also conducted and it was determined that the scheme for the closure should be that the bearings on the Pier No.5 were to be jacked up and the bearings on the Pier No.7 to be jacked down. In compliance with the scheme, the closure gap was adjusted to make the mileage deviation ≤ 2 cm, the axial line deviation ≤ 1 cm and the vertical elevation deviation ≤ 3 cm and finally the unstressed closure of the side span was smoothly realized.
Wang S.-Q.,Ningan Railway Co. |
Liu A.-L.,China Railway Major Bridge Engineering Group Co.
Bridge Construction | Year: 2013
The main bridge of Anqing Changjiang River Railway Bridge is a steel truss girder cable-stayed bridge with spatial triple cable planes and with a main span 580 m. The main girder of the bridge is the truss girder structure consisting of 3 main trusses and the pylons are the reinforced concrete structures, each being 210 m high. In the light of the characteristics of the asymmetric three main trusses, very high pylons and triple cable planes of the bridge, the truss girder was erected by the piece-by-piece assembling method, of which the girder form Pier No.6 to Pier No.7 in the area without stay cables was assembled and erected on scaffolding, the girder from Pier No.6 to Pier No.5 was erected by the cantilever method and for the girder in the area with stay cables, with the exception that the 4 panels of the girder at pier top were assembled and erected by the floating crane, the rest of the girder was erected by the cantilever method. There were two closure gaps designed for the girder of the whole bridge, the girder was closed in the sequence of the central span first and the side span late, using the technique of the closure hinge of "slotted hole+round hole". The middle and upper columns of a pylon were constructed by the climb formwork, using the technique of synchronous construction of the pylon and girder. The cable ducts in a pylon were accurately positioned in two stages (the ducts were installed to the stiff steel skeleton on the land platform and were initially adjusted and late fine adjusted on pylon). The multi-point and accurate closure of the steel truss girder of the bridge was finally successfully completed on December 12, 2012.