南京大胜关长江大桥主桥6号墩围堰下河及定位施工技术.pdf

2011年6月
高速铁路技术
No.3 Vol 2
第2卷第3期
HIGH SPEED RAILWAY TECHNOLOGY
Jun.2011
文章编号:1674--8247(2011)03-002004
南京大胜关长江大桥主桥6号墩围堰下河
及定位施工技术
黄旺明
(中铁大桥局集困有限公司,武汉430050)
摘要:南京大胜关长江大桥主桥6号墩采用壁厚2n的双壁无底钢套箱围堰作为承台施工的挡水结构及钻
孔柱施工平台。钢围堰高14.5m的底节在工厂分块制造后江滩整体拼装成型,围堰底部设置U形钢浮箱作
为气囊与围堰间的承载结构,气囊平行分布于浮箱底部的两侧,在后牵引力控制下依靠围堰自重分力缓慢滑
移入水,围堰人水浮运至墩位后采用了“锚碇系统+前定位船”的定位方案完成了钢围堰的水中精确定位。
该施工方法为桥梁深水基础施工钢围堰制造、下河浮运及锚碇定位提供了示范作用。
关键词:双壁钢套箱围堰;整体拼装;U形浮箱;气囊滑移人水;锚碇系统
中图分类号:45.55·6
文献标识码:B
Technology of Cofferdam Sinking and Fixing for No6 Pier of
Nanjing Dashengguan Yangtze River Bridge
HUANG Wang-ming
China Railway Major Bridge Engineering Group Co, Itd, Wuhan 430050, China)
Abstract: 2 m high steel cofferdam with double wall pouring jacket without bottom was employed as water retaining struc
ture and drilling platform for bearing plat orm construction of No 6 pier of Nanjing Dashengguan Yangtze River Bridge
The 14.5 m high bottom part of steel cofferdam was manufactured separately at the factory and assembled together at the
river bank. U shape steel buoyancy tank was set at the bottom of the cofferdam as bearing structure between air bags and
cofferdam. The air bags were arranged parallel at both sides of buoyancy tank and slid into river slowly with the self
weight of the cofferdam under control of rear traction force. The location by"anchor system plus prelocalization boat
cured the accurale position of the cofferdam in water after it had been floated to the pier. This construction method has
provided an example for the manufacture, floating transportation and anchoring of steel cofferdam in construction
bridge deep water foundation
Key words: steel cofferdam with double wall pouring jacket; integral assembly; U shape buoyancy tank; air bag sliding
into water; anchor system
工程简介
336+192+108)m连续钢桁拱桥,是京沪高速铁路、
沪汉蓉铁路和南京市地铁共计六线铁路跨越长江的
1.1主墩结构简介
通道
新建南京枢组大胜关长江铁路大桥工程位于既有
大桥主桥6号主墩采用46根直径为2.8m的钻
南京长江大桥上游约20km、已建成的南京长江三桥孔桩基础,钻孔栟按纵向5排、横向10排行列式布置。
1.55km的大胜关桥位。其中主桥为(108+192+2x桩底标高-120.0m,桩顶标高-13.0m,桩长107m
钢护筒直径为3.2m,护筒底标高-43.0m,护筒顶标
收稿日期:2011-04-18
高为+10.0m,钢护简总长为53m;圆端形高桩承台
作者简介:黄旺明(1974-),男,高级工程师。
平面尺寸为34mx76m,底面标高-13.0m,顶面标