肖磊



摘 要:本文研究的污水管道为紧邻污水处理厂的进水干管,该污水管为雨污合流管,埋深大,日流量大,污水水位高,无其他污水管可实行分流。针对这一现状,人们研究出一套如何掏底施作连接井、怎样带水切割改移并封堵旧管道的施工技术。这一技术的实施,成功地解决了带水作业的施工难题,通常不需要潜水员水下作业,提高了安全系数。
关键词:大直径污水管;带水切割;迁改;封堵
中图分类号:TU992.02 文献标识码:A 文章编号:1003-5168(2020)08-0082-04
Construction Technology of Water Relocation and Reconstruction in Deep Buried Large Diameter Sewage Pipe
XIAO Lei
(The First Engineering Co.,Ltd., Railway Wuju Group,Changsha Hunan 410117)
Abstract: The sewage pipeline studied in this paper was the main inlet of the sewage treatment plant, which was a rain and sewage combined pipe, with large burial depth, large daily flow, high sewage water level, and no other sewage pipe could be used for shunting. In view of this situation, people have developed a set of construction techniques for how to dig the bottom to make connection wells, and how to cut with water to change and block old pipes. The implementation of this technology successfully solved the construction problems of water-borne operations, and normally did not require divers to operate underwater, which improved the safety factor..
Keywords: large diameter sewage pipe;cutting with water;relocation;plugging
随着轨道交通工程的迅猛发展,城市中的地下空间开发利用率日益提升。然而,城市地下敷设有各种类型、纵横交错的管道,给地下空间的挖掘带来极大的不便。特别是一些大直径的老旧污水管,埋深大、迁改难度高,一旦渗漏,将造成十分严重的后果。对于大直径污水管道,在新老管道拨接时,常用的做法是上游泵站在管线改移期间停泵或将污水改移至其他管道,通过降低流速达到潜水员水下砌筑封堵作业的条件[1-5]。
1 项目概况
1.1 工程概况
太原市轨道交通2号线某车站有一条直径2 m、埋深10~12 m、东西向斜穿的污水管道。该污水管道为紧邻城南污水处理厂的进水干管,污水流量大,每日流量超过20万m3,且无其他管线可为其分流。为配合地铁施工,须对该管道进行改迁,该污水管线迁改段共设立3个工作井、2个检查井、2个连接井,主管管内径为2 m,线路总长为418.4 m,管道埋深大于10 m,坡比为7‰,采用钢筋混凝土排水管,施工工艺为非开挖顶管掘进。……