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针对横跨基坑中D2 400 mm的PCCP给水管道进行原位保护,通过对比分析,对暗挖、明挖、盖挖、盖挖加悬吊保护四种施工方案进行经济技术及可行性对比分析,确定了采用盖挖加悬吊保护施工技术。开发并采用“临时立柱+环向托架支撑+可调节钢丝绳临时悬吊”的大直径城市给水主管道原位综合保护技术,接头变形控制值在3 mm之内,保障了在不降压条件下不间断给水。确保了给水管道及施工安全,比改移方案降低了施工成本,提高了生产效率。
In order to protect the PCCP water supply pipeline across D2 400 mm in the foundation pit, the author contrasted and analyzed the economical and technical feasibility of the four construction schemes of undercutting, digging, , To determine the use of cover excavation and suspension protection construction technology. Development and adoption of “temporary column + ring bracket support + temporary suspension of adjustable rope” large-diameter urban water main pipe in situ integrated protection technology, joint deformation control value within 3 mm, guaranteed not to drop Uninterrupted water supply under pressure. To ensure that the water supply pipe and construction safety, than the relocation program to reduce construction costs and improve production efficiency.