旋挖成孔灌注桩后注浆工艺在成都京东方桩基工程中的应用

Application of Post-grouting Technology for Rotary Holing Cast-in-place Pile in Pile Foundation Project of BOECD

旋挖成孔灌注桩以其适用范围广、施工速度快等优点在工程领域中得到广泛应用,但也因其沉渣难以控制、在大直径卵石地区施工不便等因素使其发展受到制约。根据成都京东方桩基工程实例,首先分析了湿法作业下旋挖成孔灌注桩后注浆工艺的施工技术要点,进而对后注浆工艺的注浆量、注浆压力、泥浆用量进行总结,最后,对桩端沉渣控制、填方地段施工工艺等工程问题的处理提出建议措施。

Because of good adaptability and speedy construction, rotary holing cast-in-place piles have been widely used in engineering fields, but the disadvantages of difficult sediment control and inconvenience for construction in areas with largesize gravels restrict its development. Based on the engineering case of BOECD, the key points of construction technology of post grouting for rotary holing cast-in-place pile by wet operation are firstly analyzed; then grouting capacity, grouting pressure and slurry amount of post grouting are summarized; finally, some suggestions are put forward for the engineering problems such as hole bottom sediment control and fill section construction process, which may be helpful to the similar projects in the future.