天兴洲公铁两用长江大桥ザ斩ソ诩涓至杭苌枋┕ぜ际
2012-11-07王吉连陈开桥余绍宾
王吉连 陈开桥 余绍宾
【摘要】本文通过对墩顶节间钢梁架设施工技术研究,运用预应力+钢结构的墩旁托架受力体系,钢梁在临江面拼装成整节间,顶推至设计位置,通过700吨架梁吊机整孔架设其余节间的施工技术,成功的解决了7000吨级钢梁的假设难题,为类似工程施工提供了一定的借鉴和参考意义。
【关键词】桥梁工程;公铁两用斜拉桥;墩顶节间;钢梁架设;施工技术お
Tianxingzhou rail—cum—roof section between the Yangtze River pier beam erection technology
Wang Ji—lian1,Chen Kai—qiao1,She Shao—bin2
(1.Seventh Railway Bridge Bureau Group Co., LtdWuhanHubei430050;
2.MBEC Design DivisionWuhanHubei430050)
【Abstract】Based on the top section of pier between the steel beam erection technology research, the use of prestressed + steel pier next to the bracket by the force system, assembled into a steel beam in the Riverside area the entire section between Pushing to the design position, through 700 tons crane girder machine set up the entire hole between the remaining section of the construction technology, the successful resolution of 7,000—ton steel beam challenge assumptions, provide for the construction of similar projects and learn from some reference value.
【Key words】Bridge engineering;Rail—cum—cable—stayed bridge;Pier top internode;Girder erection;Construction technologyお
1. 工程概况
(1)武汉天兴洲公铁两用长江大桥全长2842.1m,按上层公路,下层铁路布置。公路桥技术标准按城市桥梁快速路标准设计,铁路桥梁技术标准为正线四线,客运专线双线,Ⅰ级标准设计。货运线按中——活载设计,客运线间距5.0m,客运线与货运线间距8.6m,货运线间距4.2m。0#~5#墩为南汊正桥,5#~20#墩为南引桥,0#~028#墩为北引桥。总长1750.1 m南北引桥均为跨径40.7m简支梁桥,铁路40.7m跨采用等高度预应力混凝土简支箱梁,客运线箱梁重量约1300t,Ⅰ级线箱梁重约1260t。公路40.7m跨采用等高度连续箱梁,单幅单跨箱梁重950t。引桥公铁合建段采用双层桥墩布置形式,下层铁路采用板式桥墩,上层公路采用框架墩。南汊主桥为(98+196+504+196+98)m双塔三索面斜拉桥。上层6车道公路为正交异性板和混凝土结合桥面板,沥青桥面;下层4线铁路(客、货运各2线)为道碴桥面,主桥立面布置见图1。
图1天兴洲长江大桥主桥立面布置示意图(单位:m)
(2)南汊主桥斜拉桥主梁为板桁结合钢桁梁,N形桁架,三片主桁,桁宽2×15m,桁高15.2m,节间长度14m。钢桁梁工地连接均采用M30、M24高强度螺栓。全桥钢桁梁重达4.3万吨,钢桁梁安装步骤为:先散拼主塔墩顶四个节间→在散拼节间上拼装2台700t步履式架梁吊机→整节段架设钢桁梁→钢梁合拢。……
