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马鞍山长江公路大桥北锚碇基础沉井施工中,通过有效的科学研究及现场落实,利用换填层换填形状及工艺的改进,提高了换填基础的整体强度;利用合理的钢壳拼装顺序保证了大体积沉井的现场制作精度;利用降排水下沉、不排水下沉的有效组合保证了沉井的快速下沉;利用下沉定位、纠偏技术和监控技术解决了下沉过程中的精度问题;利用空气幕助沉工艺解决了终沉阶段下沉困难的问题;利用首次对分区隔墙封底技术保证了沉井基础的顺利封底;利用分组施工技术解决了填芯施工进度慢的问题;现将这些经验总结出来,供今后类似工程参考。
Through the effective scientific research and on-the-spot implementation, the improvement of the shape and process of the replacement fill layer has been improved in the construction of the North Anchorage foundation caisson in the Ma’anshan Changjiang River Highway Bridge. As a result, the overall strength of the replacement foundation has been improved. Which ensures the production precision of large-volume open caisson. The effective combination of descending sinking and non-sinking sinking ensures the quick sinking of caisson. By using the positioning of sinking, the correction technology and the monitoring technology, Precision problem; the use of air curtain to help sink the sink process to solve the sinking of the final stage of the difficult problem; the use of the first partition wall partition technology to ensure the smooth caisson base back cover; grouped construction technology to solve the problem of slow construction of the core filling ; Now sum up these experiences for reference to similar projects in the future.