武汉鹦鹉洲长江大桥主桥基础工程施工技术

发布时间：2018-02-20 06:32

本文关键词： 悬索桥基础工程锚碇沉井钻孔桩地下连续墙围堰施工技术　出处：《桥梁建设》2014年05期 　论文类型：期刊论文

【摘要】：武汉鹦鹉洲长江大桥主桥为(200+2×850+200)m三塔悬索桥,该桥北锚碇为"带孔圆环+十字隔墙"重力式沉井基础,沉井外径66m,高43m;1号塔基础为44根φ2.0m钻孔灌注桩,2号塔基础为39根φ2.8m钻孔桩;3号塔基础为20根φ2.8m钻孔桩;南锚碇为"圆形嵌岩地下连续墙+内衬"结构形式,地下连续墙为钢筋混凝土结构,外径68m,壁厚1.5m。根据该桥基础特点,北锚碇沉井采用3轮接高、3次下沉施工;1号塔基础采用筑岛、双排防护桩施工方案;2号塔基础采用先钢围堰后平台的施工方案,钢围堰采用气囊法整体下河;3号塔基础采用先平台后围堰、单排钻孔防护桩施工方案;南锚碇采用液压铣槽机配合冲击钻施工地下连续墙的施工方案。
[Abstract]:The main bridge of Baozhou Yangtze River Bridge in Wuhan is a three-tower suspension bridge with 200 2 脳 850 200 m. The north Anchorage of this bridge is the gravity caisson foundation of "cross partition wall with holes". The outer diameter of the caisson is 66m, the height is 43m, the foundation of No. 1 tower is 44 蠁 2.0m bored piles, the foundation of tower No. 2 is 39 蠁 2.8m bored piles, the third tower foundation is 20 蠁 2.8m bored piles, the south Anchorage is the structure of "circular rock-socketed underground continuous wall lining". The underground continuous wall is a reinforced concrete structure with an outer diameter of 68m and a wall thickness of 1.5m.According to the characteristics of the bridge foundation, the caisson of the North Anchorage is constructed by three rounds of high height and three times, and the foundation of the No. 1 tower is constructed by building an island. The construction scheme of double-row protective pile, the construction scheme of steel cofferdam and platform on the base of No. 2 tower, and the whole downriver of steel cofferdam with airbag method, the construction scheme of first platform and then cofferdam with single row drilling protection pile for the foundation of tower No. 3; The south Anchorage uses hydraulic milling machine and impact drill to construct underground continuous wall.
【作者单位】：中铁大桥局集团有限公司;
【分类号】：U445.55

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