江津中渡长江大桥南锚碇沉井施工技术

发布时间：2018-06-20 08:28

本文选题：桥梁工程 + 悬索桥　；参考：《施工技术》2016年24期

【摘要】：江津中渡长江大桥南岸重力式锚碇沉井位于建筑物集中区,沉井平面尺寸为58.3m×45.8m,下沉23.5m,需要穿越9~12m砂卵石层,为西南地区首个大型沉井,施工难度很大。经过精确模拟计算,沉井施工采用钻孔灌注防护桩的方式确保周边建筑物的安全,同时减小了井壁侧摩阻力,利用砂套与空气幕作为下沉辅助措施,最终沉井顺利下沉到位,同时创新地采用"挖掘机+门式起重机+履带式起重机"组合机械出土方式,提高了施工效率。通过实时监测并及时调整的技术确保了沉井下沉的平稳进行。
[Abstract]:The gravity Anchorage caisson on the south bank of Jiang Jin Zhongdu Yangtze River Bridge is located in the concentrated area of buildings. The plane size of the caisson is 58.3 m 脳 45.8 m, and the sinking is 23.5m. the caisson needs to cross 912m sand and pebble bed, and it is the first large caisson in southwest China, which is very difficult to construct. Through the accurate simulation calculation, the caisson construction adopts the way of bored cast-in-place protective pile to ensure the safety of the surrounding buildings, at the same time, it reduces the friction on the sidewall of the shaft, and uses the sand sleeve and air curtain as the auxiliary measures of sinking, finally, the caisson goes into place smoothly. At the same time, the excavator gantry crane and crawler crane are used to unearth the excavator and the construction efficiency is improved. The technique of real-time monitoring and timely adjustment ensures the steady sinking of the caisson.
【作者单位】：中建六局桥梁有限公司;
【基金】：中建股份科技研发课题(CSCEC-2012-Z-22)
【分类号】：U445.557

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