陆上特大型沉井施工技术

Construction technology in huge caisson on the ground

泰州大桥主桥采用主跨2×1080m三塔两跨两锚碇悬索桥,其中南、北锚碇基础为特大型沉井,矩形平面尺寸为67.9m×52.0m,高度分别为41m,57m。针对锚碇基础覆盖层深厚、基础尺寸巨大、沉井下沉深度深等特点,通过施工技术的攻关,顺利完成了砂桩复合地基处理、沉井制作和拼装、钢壳沉井混凝土填充、混凝土沉井接高施工、水力机械冲吸式排水下沉和空气吸泥机吸泥下沉等多项施工工序,为今后陆上特大型沉井施工提供了借鉴。文章简要介绍了南、北锚碇陆上特大型沉井的施工技术。

Taizhou Changjiang River Highway Bridge is a suspension bridge with three towers,two spans and two anchorages.The main span is 2×1 080 m.The south and north foundation of the anchorages are deep water caisson with rectangular plane size 67.9 m×52.0 m.A great many of technical innovations are adopted to solve many technical problems including the disposal of the compound basement,manufacturing and installation of the caisson,fulfillment of concrete in the caisson etc,based on the conditions such as the thick overburden layer at the top of the caisson,the super dimension and the big sinking depth of the caisson.This article gives a brief introduction on construction technologies in huge caisson on the ground and can be taken as a reference during the construction of the super scale caisson on the ground in the future.