万州长江大桥钢桁拱系杆梁桥架设技术

万州长江铁路大桥采用刚性拱柔性梁的新型桁拱结构。针对大桥架设工序复杂、技术难度大等特点,采用边跨168 m钢梁在膺架上拼装及半悬臂拼装,中跨360 m钢梁利用吊索塔架辅助双向全悬臂架设、跨中合拢的方法进行拼装。钢梁架设由既可以在平弦上进行钢梁架设、又可以在斜坡上行走架设钢桁拱的架梁吊机完成。桥梁架设的关键技术及创新点包括:边跨钢梁临时支墩设计及施工、吊索塔架设计及施工、斜爬式架梁吊机设计及施工、墩顶纵横移设备布置、边跨钢梁端部压重施工、跨中桁拱及系杆合拢等。

Construction Technology for the Steel Truss-Arch Tied-Bar Beam Bridge of Wanzhou Yangtze River Bridge

Wanzhou Yangtze Railway Bridge is a new style truss-arch structure of rigid arch with flexile beam.According to the characteristics such as complex construction procedures,higher level of difficulty in techniques etc.,the side span,which is a 168 m steel beam,is assembled on the scaffolding and consolidated with the method of semi-cantilever.Simultaneously the 360 m steel beam in the mid-span is erected with suspension cable tower assisted with double-direction full-cantilever,and the span with closure.The steel beams are erected with girder erection crane,which can erect steel truss arch both on the horizontal chord and on the slope when moving.The key techniques and innovations for bridge erection include the design and construction of side span temporary abutment,suspension cable tower,and tilted-moving girder erection crane,the arrangement of the longitudinal and horizontal displacement equipment on top of bridge piers, counterweight on the end of the side span,truss arch in the mid-span and tie bar closure,and so on.