Research On The Cantilevered Construction And Supervising Control Of Yuziying Bridge

As one of the key projects on the Gan-Long railway, the Yuziying Bridge is seated at DK234+721.905 in center, with a total length of 662.67m, all of the bridge is located at straight line and the highest pier is up to 94.50m.The main bridge is a 60+100+60m three-span PC continuous box-girder bridge, and is separated into two T-type structures, one of which is comprised of one 8m pier-top box-girder segment named No.0, 13 box-girder segments in middle span or 14 box-girder segments in side span, with the most heavy segment 104 7kN, by cantilevered construction method. The top width of box-girder is 6.5m, the bottom is 4.8m, and the height varies within 7.4-3.6m from middle pier-top to middle span.Considering the high piers, bearing brackets is used for the No.0 segment's cast-in-place construction. And based on the coMParison with triangle cradle scaffold, a rhomb cradle scaffold is designed, which has wider front platform, and is more mature in techniques, simpler in structure, and more explicit in load bearing. Adoption of cantilever techniques in the construction of large span bridge involves major matters of deflection and forcing bearing safety of structure, and is related to the control of quality and safety, has direct influence on the total quality of finished project, including configuration, working status, and eventually has great influence on the use and maintenance of completed bridge structures.By way of the living example, the Yuziying bridge's construction, the cast-in-place cantilevered construction techniques and supervisingcontrol, in large span PC continuous box-girder bridge, are discussed. Combined with the matters that occurred in the construction process, some technical innovation suggestions are also given, and it is hoped that this may be helpful to cantilevered construction techniques and supervising control of further bridge project.