近地铁高水位深基坑竖向双道预应力斜撑钢管支护体系关键施工技术

Key Construction Technology of Vertical Double-track Prestressed Steel Pipe Support for Deep Foundation Excavation with High Water Level Near Metro

结合实际工程案例,针对竖向双道预应力钢支撑在近地铁高水位深基坑支护施工的重点难点,采取了精确控制支护桩被动反压土方的留设与开挖、改进钢支撑安装工艺、优化节点防水构造等关键技术,并详细介绍了施工技术要点。监测结果表明,通过一系列关键技术的应用,取得了良好的基坑安全及防水效果。

Combining with practical engineering cases, aiming at the key and difficult points of vertical double-track prestressing steel support in deep foundation excavation support construction near high water level of metro, key technologies such as precise control of retaining and excavation of passive backpressure earth side of supporting pile, improvement of installation technology of steel support and optimization of joint waterproof structure are adopted , and the key points of construction technology are introduced in detail. The monitoring results show that good safety and waterproofing effect of foundation excavation have been achieved.