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【摘要】清潩河橡胶二坝人工砾石床项目连接和引水管道部分配水管道采用的管材为钢管。本文对钢管安装过程中的主要工序进行了阐述,通过编制详细的管道安装工艺,实施严格的焊接质量控制和防腐处理,达到了预期安装效果。通过管道试压和运行效果证明,管道安装质量经受住了实践检验。
【關键词】橡胶二坝;钢管安装;钢管防腐;钢管试压
A Brief Introduction to Qingyi River Rubber Second dam Artificial Gravel bed Steel pipe Installation Process
Fu Yun-you
(Henan Water Conservancy No.2 Engineering BureauZhengzhouHenan450000)
【Abstract】In Qingyi River rubber second dam artificial gravel bed project, the pipe used for connecting and diversion piping part of the distribution pipeline is steel pipe. This paper describes the main process of steel pipe installation. The installation achieves the expected effect, through the preparation of a detailed pipeline installation process and the implementation of strict welding quality control and anti-corrosion treatment. Pipeline installation quality has withstood the practice test,proved by the pipeline test and operation results.
【Key words】Rubber dam;Steel pipe installation;Corrosion protection of steel pipe;Steel pipe pressure test
1. 引言
许昌市清潩河橡胶二坝人工湿地项目位于清潩河橡胶二坝与许由路之间的河道东西两岸滩地内,利用清潩河橡胶二坝上下游水位差,将河道上游的河水旁流引入水平潜流人工湿地处理单元进行处理,使处理后清潩河干流水质稳定达到Ⅴ类水质后再注入清潩河。清潩河橡胶二坝人工砾石床项目连接和引水管道部分配水管道采用的管材为钢管,管道安装1.7Km左右。
图1单边坡口示意图
2. 钢管安装工艺
2.1钢管安装。
2.1.1安装要求。
管道安装前,先对钢管进行逐根检查、编号,管节表面无斑疤、裂缝、严重锈蚀等缺陷,管节内部防腐层无损坏。管道安装应在沟槽基础质量检验合格后进行,选用管径相差最小的管节组对接,钢管与钢管连接采用焊接,钢管与阀门连接采用法兰接口。钢管安装前先清理管内杂物,并用水清洗管口。对口时纵向焊缝错开,当管径大于或等于600mm时,错开间距不得小于600mm。管道大于DN800mm时,点焊长度80~100mm。对口时应使内壁齐平,当采用长5000mm的直尺在接口内壁周围顺序贴靠,错口允许偏差为0.2倍壁厚,且不得大于2mm。……