2019年最全球墨铸铁管安装需知及其相关知识

        一.管材及管件的选用管材为球墨铸铁管,设计工作压力为1.0MPa,单根管子的长度为6米;管件为球墨铸【铁管件;管道接口采用T型橡胶圈承接口;支管设计坡度为0.003,流向主干管.

        二.球墨铸铁管安装程序施工准备→开挖管沟→管沟检查→放管→管材质量检查→管口除锈→清理管腔→挖工作坑→排管→检查密封橡胶圈→安装管道→检查安装质量→回◆填管身胸腔土至管顶500mm→直线段严密性试验→回填土

        三.开挖管沟中水管道施工应在道路土基施工结束后进行管道沟槽开挖,开挖根据土质进行放坡,执行国家标准《给水排水管道工程施工及验收》(GB50268-97).

        1.先核对永久水准点,沿线每隔100m左右设置一临时水准点,水准测量的,式中K为测段往返的单程距离,以km计.闭塞差不得大于10K(mm)。

        2.根据挖槽深度及土质和设计图纸确定挖※槽断面,予留足够的工作面,在现场施放挖槽边线,堆土堆料界及临时用地范围.

        3.开挖后发现槽底土质异常处,不能满♂足施工要求,须及时与相关部门联系,研究处理措施.4.挖槽质量标准槽底宽度和标高允许偏差±20mm.5.管道接口处须加挖工作坑,工作坑尺寸：宽度：管径＋1.2m长度：管口两端各0.5m深度：铸铁管接口处0.3m6.沟槽开挖采用1.0m3挖掘机配合人工开挖,开挖土方临时堆在沟槽一侧,另一侧作为放置管道及安装的工作面.开挖土方一部分作々为回填使用,另一部○分由1.0m3挖掘机或3m3装载机装车,弃在监理指定的地方,并加以整理,以?せ肪?开挖距■沟底20cm时,由人〗工进行清理,以保证沟底原状土不受扰动.

        四.管道基础管道埋深范围内无地下水时,管道基础原土夯实后做200mm厚细砂垫层.有地下水时,做250mm厚细砂垫层.

        五.各类井施工▆时,应先砌□　筑井筒至设计地面下200mm-300mm处,然后在施工道路面层时,按路面找平安装盖座及井盖,以井盖与实际路面平为准,绿化带范围内的检查井井盖→商出绿化带设计地面100mm,道路红线以外的阀门井井口高出现状地面200mm,所有检查井均需要做防渗处理.给水管泄水湿井应设在管道附近无其它管道▲的位置;泄水湿法井排水管道采用混凝土管.井盖：井盖在机动车道上采用重型钢筋混凝土井盖,在非机动车道上采用轻型钢筋混凝土井盖,阀门井.排气井.泄水井的井盖上应注明“中水”字样或标记.

        六.管道防腐球墨铸铁管及管件的内壁均采用水泥砂浆内衬防腐,外壁⌒　均采用环氧煤沥青防腐,球墨铸铁管的内.外防＠腐均应在管道出厂前完成.钢管及钢管件在制造厂加工完毕后,应在厂内进行喷砂除锈,除锈达到Sa2.5级,除∮锈完毕后钢管及钢管件应立即在厂内进行预先防腐々处理,内壁均采用水泥砂浆内衬防腐,外壁均采用四二布环氧煤沥肝防腐.

        七.管道铺设

        1.清理管端锈蚀,管膛杂物,压胶圈处应清除毛刺,除锈,擦抹干净.

        2.按照来水方向和斜坡方向♀确定承插口方向,按承口方向摆放铸铁管.

        八.管道组装管道借转：当道路不正交◥或者管道转弯不到位时,用管道接口偏转变调管道位置,每个接口最大允许借转角度不应大于3度.主干管≥DN400在下ぷ列部位：水平及竖向应设管道支墩;三通.弯头(≥5?)及管堵,做法见S3(下)-CS345(三).

以经纬仪控制↑管侧边确定管轴线,水准仪按照∮管长设计坡降控制管的两侧端口顶高程来确定管中心标高.检查承口和插口密封面后,在插口上套好密封圈∩,用拉链等机械将插口拉入承口内,再检查其轴线及高程,依次逐节安装.管道铺设中断或下班前将管口堵好,以防异物进入,下次施工前对管口▲进行检查.管道安装完,在试压前为防止管身受外力移动,在管身胸腔』回填土(留出管口位置).

管道在转弯处,改变︻弯径处,三通.阀门等⌒　处均应设置止堆礅.

        九.球墨铸铁管安装

        1.球墨铸铁管▓及管件的外观质量符合规定：管及管件表面不得有裂纹,管及管件不得有防碍使用的凹凸不平缺陷;承口的内∮工作面和插口的外工作面应光滑.轮廓清晰,不得有影响接口密封性的缺陷;球墨铸铁管的尺寸公差应符合现行国家产品标准规▃定.

        2.管及管件下沟≡前,应清除承口内部的油污.飞刺.铸砂及凹凸不平的铸瘤;有裂纹的管及管件不得使用.沿直线安装管道时,宜选用管径公差组合◥最小的管节组对连接,接口的环向间隙应均匀,承插口间的纵向间隙不应小于3mm;管道沿曲线安装时,接口的允许转角不得大于1°.

        3.圆形橡胶圈应符合国家现行标准《预(自)应力.自应力钢筋砼管↑用橡胶密封圈》的规定.

        4.球墨铸铁管安装偏差符合下列规定：轴线位置偏差30mm,高程偏差±20mm.

        十.管道々试压管道安装完毕,且未全部回填土前应进行管道水压试验,管道试验压力为1.5MPa,管道水压试验应执行国家标准《给水＠ 排水管道工程施工及验收规范》(GB50268-97).

        十一.管道的冲洗消毒管道竣工验收前应进行卐冲洗和消毒,冲洗消毒前,施工单位应准备好消毒剂.临时排水口和排◆水点.

        十二.沟槽回填水压试验前,接口前后0.2m范围内不得回填,以便试压观察.管道两侧及管顶︻以上回填高度不小于0.5m,水压试验★后,应及时回填其余部分,回填土时槽底至管顶以上50cm范围内,不得有有机物以及大于50mm的砖石等硬块.且应逐层回填,每层回填厚度为15-20cm,并分层夯实至少两遍以上.十三.管▃道施工及验收管道施工及验收除应遵守施工图说明外,还应执行国家标准《给水排水管道工程施工及验收规范》

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Nodular cast iron pipe installation needs and related knowledge

        1. Pipes and fittings are made of ductile iron with a design working pressure of 1.0 MPa and a single pipe length of 6 meters; pipe fittings are made of ductile iron; pipe fittings are made of T-shaped rubber ring bearing joints; branch pipe design slope is 0.003 and flows to main pipe.

        2. Construction preparation for installation procedure of ductile iron pipe trench excavation trench inspection pipe placing pipe material quality inspection pipe opening rust removal pipe excavation drainage inspection of sealing rubber ring installation pipe inspection of installation quality backfill pipe body chest soil to pipe top 500 mm linear section tightness test backfill soil

        3. Pipeline trench excavation should be carried out after the construction of road soil foundation. Slope excavation should be carried out according to soil quality. The National Standard "Construction and Acceptance of Water Supply and Drainage Pipeline Project" (GB50268-97) shall be implemented.

        1. Check the permanent leveling point first, set a temporary leveling point every 100 m or so along the line, leveling measurement, type K as the one-way distance between the measurement section, in km. Blocking difference should not be greater than 10 K (mm) 2. According to the depth of excavation and soil and design drawings to determine the section of excavation, to leave enough working face, in the site facilities excavation edge line, soil and pile boundary and Temporary land use.

        3. After excavation, it is found that the abnormal soil at the bottom of the groove can not meet the construction requirements, so it is necessary to contact the relevant departments in time to study the treatment measures. 4. The width of the groove bottom and the allowable deviation of the elevation (+20mm.5). Work pit should be excavated at the joint of the pipeline. The working pit size: width: pipe diameter + 1.2m length: 0.5m depth at both ends of the pipe mouth: cast iron pipe connection. The excavation of 0.3m6.trench at the entrance adopts 1.0m3 excavator to cooperate with manual excavation. The excavation earthwork is temporarily piled on one side of the trench and on the other side as a working face for placing pipelines and installation. When excavating 20cm from the bottom of the ditch, it is cleaned manually to ensure that the original soil of the ditch is not disturbed.

        4. When there is no groundwater in the buried depth of pipeline foundation, the original soil of pipeline foundation is compacted and the fine sand cushion with thickness of 200 mm is made. When there is groundwater, the fine sand cushion with thickness of 250 mm is made.

        5. When constructing all kinds of wells, the wellbore should be built to 200 mm-300 mm below the design ground first, and then the safety cover and well cover should be found according to the road surface. The level of the well cover and the actual road surface should be taken as the standard. The inspecting wellbore cover within the Green Belt should be 100 mm above the design ground, and the valve wellbore outside the red line should be high above the ground. 200 mm, all inspection wells are required to do anti-seepage treatment. Water supply drainage wells should be located in the vicinity of the pipeline without other pipes; water drainage wells using concrete pipes. Well. The "cover" should be marked on the manhole cover of the drain well.

        6. The inner wall of pipeline anticorrosive ductile iron pipes and fittings is anticorrosive with cement mortar lining, the outer wall is anticorrosive with epoxy coal tar pitch, and the inner and outer anticorrosive of ductile iron pipes should be finished before the pipeline leaves the factory. After the steel pipes and fittings are processed in the manufacturer's factory, they should be sandblasted and rusted in the factory, and the rust removal can reach Sa2.5 grade. Pipes and steel pipe fittings should be pre-treated in the factory immediately. The inner walls are anticorrosion lined with cement mortar, and the outer walls are anticorrosion lined with tetradecyl epoxy coal.

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