坝陵河大桥钢桁加劲梁施工架设方案研究

首先研究了跨缆吊机架设法、缆索吊机架设法、桥面吊机悬臂拼装架设法和顶推架设法’4种悬索桥钢桁加劲梁施工架设方法,根据坝陵河大桥的建设条件,综合考虑施工安全、质量、工期、环保和经济性等因素,推荐采用桥面吊机悬臂拼装架设法。在此基础上,研究了钢桁加劲梁在悬臂拼装过程中的3种连接方式：全铰法、无铰逐次刚接法和有铰逐次刚接法,综合考虑施工安全、质量和工期要求,推荐采用有铰逐次刚接法。此外,研究了钢桁加劲梁在悬臂拼装过程中架设前端吊索的牵引方案。最后,研究了靠索塔首次节段、标准节段以及合龙段等3个关键阶段的架设方案。桥面吊机悬臂拼装方案为我国西部地区大跨钢桁加劲梁悬索桥的设计和施工提供了1种新的方法。     

主航道桥设计

珠海大桥主航道为四跨箱形连续刚构桥，下部为薄壁空心墩和钻孔灌注桩基础，本文主要介绍主梁及主墩桩群设计。     

Research on Erection Methods of Steel Stiffening Truss Girder for Baling River Bridge

Four　methods　of　erecting　steel　stiffening　truss　girder　of　suspension　bridge,including　the　deck　lifting　gantry　crane　method,the　cable-mounted　crane　method,the　cantilever　erection　method　with　derrick　crane　and　the　incremental　launching　method,were　studied　Based　on construction　conditions　of　the　bridge,according　to　the　optimal　combination　of　various　factors　such　as　construction　safety,quality,period,environmental　protection　and　economic　performance,etc,the cantilever　erection　method　with　derrick　crane　was　recommended　for　the bridge.　On　this　basis,three　categories　of　connection　in　cantilever　erection　methods,including　the　all　hinged　method,the　successive　fully　splicing　method　and　the　successive　splicing　with　temporary　erection　hinge　method,were　studied　The　successive　splicing　with　temporary　erection　hinge　method　was　recommended　in　the　bridge　with　consideration　of　the　requirements　of　construction　safety,quality　and　time　limit　In　addition,the　traction　method　of　hangers　at　the　top　end　during　cantilever　erection　was　studied　Finally,the　erection　method　of　three　key　 stages,including　the　first　segment　near　the　pylon,the　standard　segment,as　well　as　the　closure　segment　of　steel　stiffening　truss　girde,r　was　studied.　The　cantilever　erection　method　with　derrick　crane　provides　a　new　way　for　design　and　construction　of　long-span　suspension　bridge　with　steel　stiffening　truss　girder　in　the　western　area　of　China