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pe下水管件的安装步骤是怎样的?

浏览:32次 | 提问时间: 06-30 04:52
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3个答案
怪我嗔你让我懒得放弃 06-30 04:53

1、管道安装及压力试验1)、下料由于管道的转弯,三通与变径时,需要待定长度。根据所需图纸设计的长度尺寸,要将管材截断并打磨掉暴露的金属丝。管长应考虑管件的承插深度、管口打磨余量(切割平整的可以不予考虑)及增加上得封口环或PE焊条厚度(一般3~5mm),端口与管材轴线必须垂直,并且承插入管件前要仔细检查截断后暴露的铁丝已经被封口环或PE焊条完全遮盖。不然会出现密封不严,导致泄漏。如果管材与锥形口管件碰头,则在下料时应考虑与管材连接的法兰头及电熔套筒的尺寸。2)、封口断管后需使用PE焊条用焊枪进行手工塑料热堆焊将暴露的钢丝完全遮盖,焊缝应尽可能的均匀,断面严禁钢丝暴露。3)、去氧化层为了提高熔接性能,管材的熔接面需去氧化层。De50~200的可以采用手刮刀(玻璃片),由于小口径管壁较薄,只要去除氧化层就行。De250~500的由于口径大,面积大,可以采用打磨处理,提高效率。去氧化层时应均匀刮整个周边,做到面面俱到,一处不漏。刮削的长度需大于关键承插深度。4)、管壁的清洗刮好后要用清洁的抹布对管材、管件的内外做清洁,使熔接面不带有泥、油、及其他的赃物。抹布弄脏后要及时清洗,避免让管材、件上二次沾染赃物。5)、凉干组对时要保证管材、件端口干燥,不允许有水珠进行组对。如果用未凉干的管材、件进行组对,焊接时就容易产生气泡,影响熔接面的粘合,造成泄漏。6)、做记号在管材端口做好管件承插深度的记号,这样可以确保管材承插到位,保证熔接质量。如果承插不到位,加热部分会露空,熔接面积减少,承压的能力就会大大降低,即使在试压时勉强过关用不了多久就会出现泄漏的问题。所以做记号非常重要,必须明显、清晰。7)、安装拉力器De250以上口径安装时推荐使用拉力器,尽量不要人工敲打。拉力器不但起到了拉紧承插使焊接时不易外移的作用,还起到了扶正管材与管件的校圆作用。需要注意的是要将拉力器的两个卡环调到管材的适当位置,必须位于承插记号以后,以免抵住管件使承插不到位。8)、调整安装完成后,将管件与管材连接处调整到同一个同心度、水平度,管件处不能出现严重的V字型。合格后方可进入下一步工序。9)、焊接管材与管材的连接是通过管件以电熔的方式进行连接的,连接前要做以下几个步骤:(1)接电源:焊机的使用电源有220V及二相380V两种,使用前务必核对清楚。所使用的电缆致少3×6+1mm2规格,如输送的距离过长,电缆需适当加粗,减少线损。(2)试焊机:接好电源后,对焊机进行调试,是否能正常工作。(3)接管件:将焊机的输出线与管件的接线柱连接好,不得有松动,导致接触不良。(4)开始焊接:焊接按起动“按扭”时,电压、电流“调节器”必须回零位置。起动后,缓慢调整电压电流“调节器”使电压、电流到设定值,调节时不能过快,一般以电压逐一上涨为准。由于天气、气候、季节不同使焊接参数有所影响,在焊接过程中需对公司提供的参考参数做暂停、延长、缩短等调整。为了保证参数的适用性,最好由PE钢骨架厂家提供参考参数在工程开工之前在现场焊接前根据现场情况先做1~2个破坏性管件焊接试验,即解剖试验,观察焊接效果。(5)调整参数:焊接时可能出现异常情况需对参数进行调整,如电压、电流有上涨过快变化。由于天气、配合间隙、材料不同使焊接参数有所影响,在焊接过程中需对参数做暂停、延长、缩短等调整。(6)焊接完毕:完成焊接后,卸除输出线与管件的连接。观察管件的温度是否正常,左右前后温度有无较大差异,冒料是否影响美观。如有不正常现象应给予当场切除处理。在寒冷气候(-5℃以下)和大风环境条件下进行焊接连接操作时,应采取保护措施(保温),未采取措施的不能进行施工。可管件安装、焊接处通过搭建简易棚升温。7)冷却焊接完后在冷却过程中要让接头处于自然状态,且应保证冷却过程中不受任何外力作用,不得移动、转动接头部位及两侧管道。冷却时间应根据气候条件、管件大小等确定。8)压力试验装置内管线可以按系统分系统试压,但需注意的是凡是与外管相连的管线由于PE钢骨架管的特殊性,无法与外管隔断(无入户阀门的情况下),这样的情况基本上只能是在整体联动试车时做一次试水,不能够达到强度试验的压力。无法确保在试压后是否会出现泄漏。2、施工过程中对一些问题的处理在盐水一期出现的问题比较突出,一是因为管材、件内外壁清洗不足;承插深度不够;热熔时环境温度不足引起的泄漏。二就是在前期提取材料计划时的经验不足导致部分管件到现场后出现无法安装的情况,影响了工期。在二期工程吸取了一期失败的经验,将交底工作做的更完全,让施工队深刻的了解到了做好每一步工序的重要性。在材料提取方面更仔细的审每一张图,基本做到了到料就能装,大大提高了施工效率,保证了工期。

茶霏 06-30 05:01

1、施工工序:管线测量→管线清表→修筑施工便道→管沟开挖→PE管材运输→施工砂垫层→PE管热熔连接→管道敷设→管身回填→管段试压→阀门、井室安装→管沟回填→设置管道标示→通水试验2、PE管连接操作方法热熔对接的连接界面是平面,其方法是将两相同的连接界面用热板加热到粘流态后,移开热板,再给连接界面施加一定压力,并在此压力状态下冷却固化,形成牢固的连接。其主要工艺过程为调整、加热、切换、合缝加压和冷却。对接时界面上处于粘流态的材料有流动也有扩散,流动太大不利于扩散和缠结,所以要把流动限制一定范围,在有限的流动中实现“熔后焊接”。因此,对接工艺的关键是要在对接过程中调整好温度、时间、压力三参数,要把连接界面材料的性能、应力状况、几何形态以及环境条件等因素一起考虑,才能实现可靠的熔焊。3、阀门安装闸阀、蝶阀安装前应检查填料,其压盖、螺栓需有足够的调解余量,操作机械和转动装置应进行必要的调整,使之动作灵活,指示准确,并按设计要求核对无误,清理干净,不存杂物。闸阀安装应保持水平,大口径密封垫片,需拼接时采用迷宫形式不得采用斜口搭接或平口对接。4、法兰(1)法兰盘密封面及密封垫片,应进行外观检查,不得有影响密封性能的缺陷存在;(2)法兰盘端面应保持平整,两法兰之间的间隙误差不应大于2mm,不得用强紧螺栓方法消除歪斜;(3)法兰盘连接要保持同轴,螺栓孔偏差不超过孔径的5%,并保证螺栓的自由出入;(4)螺栓应使用相同的规格,安装方向一致,螺栓应对称紧固,紧固好的螺栓应露出螺母之外2-3扣;(5)严禁采用先拧紧法兰螺栓,再焊接法兰盘焊口的方法。

稀灬峳彼岸花 06-30 05:09

a、将与管材规格一致的卡瓦装入机架。
b、准备足够的支撑物,保证待焊接管材可与机架中心线处于同一高度,并能方便移动; c、设定加热板温度200~230℃。
d、接通焊机电源,打开加热板、铣刀和油泵开关并试运行。
e、核对欲焊接管材规格、压力等级是否正确,检查其表面是否有磕、碰、划伤, 如伤痕深度超过管材壁厚的10%,应进行局部切除后方可使用。
f、用软纸或布蘸酒精清除两管端的油污或异物。
g、将欲焊接的管材置于机架卡瓦内,使两端伸出的长度相当(在不影响铣削和加热的情况下尽可能短,宜保持20~30mm),管材机架以外的部分用支撑物托起,使管材轴线与机架中心线处于同一高度,然后用卡瓦紧固好。

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