铜陵公铁两用长江大桥桁片式钢桁梁立体试拼装工艺
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摘要
铜陵公铁两用长江大桥为五跨连续钢桁梁三索面斜拉桥,钢桁梁采用板桁结合形式,由3片主桁、上层正交异性公路板式桥面、下层正交异性铁路钢箱桥面及横联构成。钢桁梁采用整体焊接式桁片结构,每2个节间的主桁上、下弦杆,斜杆,竖杆通过整体节点焊接成桁片上桥安装。为验证制造工艺和精度并指导实桥施工,选取3.5个连续节间钢桁梁在工厂内一次完成立体试拼装。由于主桁桁片采用水平拼装制作工艺,采用800t龙门吊机2×200t吊钩提升加横移对桁片进行90°转体翻身后试拼装。试拼装过程中设置了抗推拉刚性斜撑增强桁片与铁路桥面的稳定性;在斜杆件加垫片,通过调整间隙控制桥梁预拱度。试拼装过程中设置了测量控制网,检测结果满足设计和验收标准,达到了立体试拼装目的。
The Tongling Changjiang River Rail-cum-Road Bridge is a five-span continuous steel truss girder cable-stayed bridge with three cable planes.The steel truss girder is the combined orthotropic steel plates and steel trusses structure,containing three main trusses,the upper orthotropic steel plate deck for vehicles,the lower orthotropic railway steel box deck and lateral bracings.The steel truss girder is a integrally-welded truss structure,the upper and lower chords,diagonal struts and vertical struts of the main trusses in every two blocks are welded by integral nodes to be truss block for assembling on the bridge.In order to verify the manufacturing technique and precision and to direct the construction of the real bridge,the steel truss girder in 3.5continuous blocks were selected to conduct one-time trial vertical assembly in the factory.The main truss blocks were fabricated by the horizontal assembling technique,the 800 toverhead lifting gantry with two lifting hooks of 200 twas adopted to lift and horizontally move the truss blocks and complete their 90°rotation and turning,and then conduct the trial assembly.During the trial assembly,the rigid diagonals resisting pushing and pulling forces were added to strengthen the stability of the truss blocks and the railway bridge deck.At the inclined members,shims were wedged to control the precamber of bridge via adjusting the spacing.The survey control network was programmed as well during the assembling process,the results of the inspection meet the design and acceptance standard,achieving the goal of vertical assembly.
The Tongling Changjiang River Rail-cum-Road Bridge is a five-span continuous steel truss girder cable-stayed bridge with three cable planes.The steel truss girder is the combined orthotropic steel plates and steel trusses structure,containing three main trusses,the upper orthotropic steel plate deck for vehicles,the lower orthotropic railway steel box deck and lateral bracings.The steel truss girder is a integrally-welded truss structure,the upper and lower chords,diagonal struts and vertical struts of the main trusses in every two blocks are welded by integral nodes to be truss block for assembling on the bridge.In order to verify the manufacturing technique and precision and to direct the construction of the real bridge,the steel truss girder in 3.5continuous blocks were selected to conduct one-time trial vertical assembly in the factory.The main truss blocks were fabricated by the horizontal assembling technique,the 800 toverhead lifting gantry with two lifting hooks of 200 twas adopted to lift and horizontally move the truss blocks and complete their 90°rotation and turning,and then conduct the trial assembly.During the trial assembly,the rigid diagonals resisting pushing and pulling forces were added to strengthen the stability of the truss blocks and the railway bridge deck.At the inclined members,shims were wedged to control the precamber of bridge via adjusting the spacing.The survey control network was programmed as well during the assembling process,the results of the inspection meet the design and acceptance standard,achieving the goal of vertical assembly.
引文
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[2]刘自明,王邦楣.斜拉桥手册[M].北京:人民交通出版社,2004.
[3]中铁大桥勘测设计院集团有限公司.铜陵长江大桥施工图设计[Z].武汉,2012.
[4]TB 1002.2-2005,铁路桥梁钢结构设计规范[S].
[5]TB 10212-2009,铁路钢桥制造规范[S].
[6]宋红飞.矮寨大桥钢桁梁节段立体试装技术[J].世界桥梁,2013,41(6):16-19.
[7]黄鑫,罗章智,成宇海.重庆朝天门长江大桥主桁试拼装精度控制方法研究[J].世界桥梁,2009,(2):31-33.
[8]胡汉舟,刘自明,秦顺全,等.武汉天兴洲公铁两用长江大桥斜拉桥技术总结[M].北京:中国铁道出版社,2009.
[9]中铁山桥集团有限公司,中铁九桥工程有限公司.合福铁路铜陵长江大桥钢桁梁制造验收规则(修订版2)[Z].秦皇岛,2012.
[10]鄢怀斌,郑自元,黄行裕.铜陵公铁两用长江大桥钢桁梁全焊桁片制造技术[J].桥梁建设,2014,44(1):6-10.
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