长距离大口径自流管道施工关键技术探讨

Discussion on the Key Technology of the Construction of Long-distance and Large Diameter Self-flow Pipeline Construction

扬州第一水厂取水口迁建工程采用河床式取水方式,规模为60×104 m3/d。取水泵房设有两根钢管自流管道,管径为DN1800,两根自流管道施工方法相同,靠近泵房侧利用吸水井作为工作井顶管施工,靠近取水头部的钢管采用水下开槽铺设施工方法。在顶管施工中,掌握了穿墙出洞、注浆减阻、勤纠微纠等关键技术,使顶管对周边环境影响较小;注浆加固大堤,安全度过了几个汛期;取水头部施工,掌握了打桩、吊运安装等关键技术,使取水头部准确就位。经检测,自流管道的施工质量满足《给水排水管道工程施工及验收规范》(GB 50268—2008)的要求。

The mode of riverbed type water intake was utilized to the transfer project of water intake in Yangzhou First Water Treatment Plant,with a scale of 60×104 m3/d.The water intake pump house was provided with two self-flow steel pipes,with diameter of DN1800.The construction method of these two pipes was the same,close to the side of the pump house,using suction well as working well for pipe-jacking construction.In addition,the construction of the steel pipe was near the head of the water intake,and the construction method of underwater slotting was adopted.The key technologies such as piercing through-wall and out of the hole,drag reduction by injecting as well as frequently and micro revised were utilized during the pipe-jacking construction,which was good to reduce the adverse impact on the environment;the technology of grouting reinforcement was used to keep the safety during several flood seasons.Additionally,some critical technologies(such as pilling,lifting installation,etc.),were used for keeping accurate installation for intake head.After construction testing,these pipes could meet the requirement of Code for Construction and Acceptance of Water Supply and Drainage Pipelines(GB 50268-2008).