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DOI:10.7672/sgjs2016110032
施工技术
CONSTRUCTION TECHNOLOGY
2016年6月上第45卷第11期
武汉鹦鹉洲长江大桥人字形钢-混叠合塔施工技术
李陆平，冯广胜，罗瑞华
（中铁大桥局集团有限公司，湖北武汉430050）
3m与承台混凝土一起浇筑；针对下塔柱截面尺寸大的特点，利用钢绞线作为模板拉杆。上段钢塔通过设置锚杆定位支架和限位装置、三向千斤项等措施对T1节段进行精确定位；T1节段承压板下采取后压浆工艺，确保钢-混结合段密实、密贴；T3节段采用分块吊装、现场焊接技术；上横梁采用2节段无支架悬臂拼装技术。通过工厂预拼、现场测量和计算机模拟分析，提前对钢塔线形进行预控，并在调整接头设置合理的调整量，最终使钢塔安装线形满足设计和规范要求。
【关键词］桥梁工程；悬索桥；钢-混叠合塔；钢塔；吊装；线形控制；悬臂拼装；施工技术
［中图分类号】U445.4
【文献标识码］A
[文章编号】1002-8498(2016)11-0032-04
Construction Technology of Herringbone Reinforced Concrete Composite Tower of WuhanParrot Island Yangtze River Bridge
Li Luping,Feng Guangsheng,Luo Ruihua
(China Raileay Major Bridge Engineering Group Co. ,Lid., Wuhan,Hubei
i430050,China）
Abstract : Herringbone reinforced concrete composite tower is used in No. 2 tower construction of Wuhan Parrot Island Yangtze River Bridge for the first time. The lower tower column is a reinforced concrete structure, the bottom segment with 3m and pile cap concrete are poured; according to the large section of the lower tower column , steel strand is used as a formwork rod. T1 segment is precisely located by setting bolt positioning bracket and limit device, three-direction jack and so on for upper tower; post-grouting technology is used under bearing plate of T1 segment, which ensures the reinforced concrete composite segment compact and close; hoisting block and on-site assembly technology are used for T3 segment; two-segment cantilever erection technology without bracket is used for the upper cross girder. Through the factory pre assembly, field measurement and computer simulation analysis, the shape of steel tower is pre-control in advance, setting a reasonable amount of adjustment in the adjustment of the joint. Finally, the linear control of the steel tower meets the requirement of design and specification.
Key words: bridges; suspension bridges; reinforced concrete composite towers; steel tower; hoisting; linear control; cantilever erection; construction
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引言
近几年以来，我国相继修建了泰州长江大桥、
马鞍山长江大桥、武汉鹦鹉洲长江大桥3座三塔大跨度悬索桥。与一般的两塔悬索桥不同，三塔悬索桥多了一个中间塔，该体系在两主跨非对称荷载的不利作用下，其中塔的变形需要重点考虑两方面问题：①主缆与中塔鞍座之间的滑移和结构安全问
【作者简介］李陆平，高级工程师，项目副总工程师，国家一级注册建
造师，E-mail：lupingli@163.con【收稿日期】2016-01-11
题：②加劲梁及桥面变形问题。
经分析可知，如果中塔的刚度选择过大，则在两主跨非对称荷载的不利作用下，由于主缆在鞍座处产生不平衡水平力较大，主缆相对于鞍座易出现滑移现象，这对于悬索桥而言是不允许的；如果中塔设置过“柔”，则在非对称荷载作用下会引起加劲梁及桥面的变形过大，从而影响桥面线形和行车的舒适度。上述两方面问题决定了三塔悬索桥中间塔的刚度选择要适当，既不能过“刚”也不能过“柔”[1]，因此三塔悬索桥中塔往往选择钢塔（或钢-