PCCP管设计承压封堵技术要求.docVIP

PCCP管设计承压，封堵技术要求 这些年，国内引水工程许多选用PCCP管道输水，PCCP管道通常在描绘工况下运转是比拟安全的，可是也不扫除一些外界的缘由构成PCCP管道的损坏，在遇到这种状况下，能找到一种最方便有用的管道堵漏办法，尤为重要。 These years, many domestic water diversion project selection of PCCP pipe, PCCP pipe is usually described in the condition of operation is relatively safe, but also do not eliminate some external reasons for the formation of damage to the PCCP pipeline, in the face of this situation, to find a most convenient and useful method of pipeline plugging, particularly important. 1　工程概略 1 Engineering Survey 　　某岩土公司在进行公路勘测钻探时，将一段PCCP输水管道排气阀上游第三节管道构成钻孔破损，致使管道严峻漏水事端状况。经开始查勘发现，钻孔破损方位在管道中间线偏左侧腰部，距上游接头约1.70 m处。且钻孔方位在坐落沿管道旁边面190 mm厚的管壁上，没有构成彻底通透的正交圆孔。为缩短事端处置时刻，在不间断向下游水厂供水的前下，经多计划比拟采纳了如下处置办法。 A geotechnical company in Highway Survey and drilling, a third exhaust valve upstream of the PCCP pipeline section pipe drilling damage, resulting in serious trouble of water leakage of pipeline. The survey found that the start, drill breakage range in the pipeline center line offset to the left waist, distance of about 1.70 m upstream joint. And the drilling direction on the wall of the tube is located along the pipeline side surface 190 mm thick, not orthogonal circular completely transparent. In order to shorten the time trouble disposal, water supply to downstream water plant in unbroken front, the plan is adopted the following measures. 2　封堵具体过程和办法 2 sealing concrete process and methods 　　1）施行减压供水。下降事端段的管道内压，使漏水点处不再漏水，具有操作处置的条件。2）具体查看漏点钻孔破损状况，核实并断定钻孔损坏部具有环氧砂浆封堵处置条件。3）环氧砂浆封堵操作过程：使用火焰式割具对钻孔损坏部及周围施行加温枯燥处置，完结钻孔损坏部构成的空泛内外表悉数清洗，将装备好的环氧树脂胶（环氧树脂胶（SK-138）A组份为乳白色至灰白色粘稠液体，B组份为棕黄色至棕赤色粘稠液体，A、B组份1∶1（体积比）制造。）均匀的涂装一道于破损的孔洞内外表直至外部边际，以便与这以后填充的环氧砂浆杰出粘接；再选用装备好的环氧砂浆（环氧树脂胶与水泥、砂的1∶1∶1的（分量比）制造、砂浆资料水泥为42.5 MPa一般硅酸盐水泥，砂为通过冲刷、加热、筛分后粒径＜1 mm的细砂）对钻孔损坏部构成的空泛底部做找平处置，再选用直径116 mm、厚度10 mm的圆钢板进行钻孔底部的衬托，圆钢板上部复填环氧砂浆至管道外壁高，即到达钻孔损坏部封堵的高度需求，填塞过程中分层用木锤轻捣，保证环氧砂浆填筑的密实性。4）封堵后环氧砂浆的维护：首要当环氧砂浆封堵到达管道外外表高度后，选用汽油喷灯对封堵部周围进行加热，保证管道外壁余水不搅扰到完结封堵部的环氧砂浆的初凝；其次在初凝时刻由封堵人员对没有凝结的环氧砂浆顶面采纳整平维护，以保证初凝后封堵部的外观平坦；最终在完结封堵部外部防护办法施工后，掩盖以草袋并