安庆长江铁路大桥4号墩斜拉索挂设施工  

Stay Cable Installation at Pier No.4 of Anqing Changjiang River Railway Bridge

作　　者：童林鸿 肖江文[2] 王林[2] 

机构地区：[1]中铁大桥局宁安铁路安庆长江大桥工程指挥部,安徽安庆246008 [2]中铁大桥局集团第二工程有限公司,江苏南京210015

出　　处：《桥梁建设》2013年第5期18-22,共5页Bridge Construction

摘　　要：安庆长江铁路大桥主桥为(101.5+188.5+580+217.5+159.5+116)m双塔三索面钢桁梁斜拉桥,该桥斜拉索采用热挤聚乙烯7mm热镀锌钢丝拉索,斜拉索最长301.750m,单根索最重37.3t。由于该桥4号墩需部分采用塔梁同步施工,为实现快速、安全挂设斜拉索,成盘索采用塔吊及架梁吊机提升上桥;在主边跨上桁面设置展索通道,通过塔吊、塔顶吊架2种起吊方式完成塔端提升挂设;索体脱空后在上桁面展索,短索、中索利用导向系统与卷扬机配合完成梁端安装,长索利用导向系统、卷扬机牵引系统及软牵引系统配合完成梁端安装;同步对称分级完成塔端1组(6根)斜拉索的张拉施工。目前,该桥4号墩斜拉索已全部挂设并初步张拉完成。The main bridge of Anqing Changjiang River Railway Bridge is a steel truss girder cable-stayed bridge with double pylons,triple cable planes and with span arrangement（101.5＋188.5＋580＋217.5＋159.5＋116） m.The stay cables of the bridge are the ones formed by the φ7 mm hot galvanized steel wires with hot extruded polyethylene sheaths,of which the longest cable is 301.750 m and the heaviest single cable is 37.3 t.Since the pylon and main girder at Pier No.4 of the bridge was to be partially constructed concurrently and to achieve the rapid and safe installation of the cables at the pier,the reeled cables were lifted onto the bridge by the tower crane and deck crane.The stay cable unreeling way was arranged at the truss top of the main and side spans and the installation of the cables on the pylon was completed by two ways of lifting by the tower crane and pylon top lifting frame.After the reeled cables were lifted in place,the cables were unreeled on the truss top.The short and medium cables at the main girder were installed by the guiding system and winch and the long cables there were installed by the guiding system,winch hauling system and the soft hauling system.A group （6 nos.） of the cables on the pylon was tensioned concurrently,symmetrically and in stages.Presently,the installation and initial tensioning of the cables at pier No.4 have been all completed.

关 键 词：铁路桥 斜拉桥 斜拉索 施工技术 桥梁施工 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]