(1)管道下沟前，应检查沟底标高、沟宽尺寸能否契合设计请求，保温管应检查保温层能否有损伤，如部分有损伤时，应将损伤部位放在上面，并做好标志，便于统一修理；
(1) Before the pipeline goes down the ditch, the elevation of the ditch bottom and the width of the ditch should be checked to meet the design requirements. The insulating pipe should check whether the insulating layer is damaged or not. If part of the insulation layer is damaged, the damaged part should be put on it, and a good mark should be made to facilitate the unified repair.
(2)管道应先在沟外停止分段焊接以减少固定焊口，每段长度普通在25－35m为宜。下管时沟内不得站人，采用机械或人工下管均应将管迟缓、平直公开入沟内，不得形成管道弯曲；
(2) Pipeline should stop sectional welding outside the groove to reduce fixed weld joints. The length of each section is usually 25-35m. No one should stand in the ditch when the pipe is laid down. When the pipe is laid down by mechanical or manual means, the pipe should be slowly and openly into the ditch, and the pipe should not bend.
(3)沟内管道焊接，衔接前必需清算管腔，找平找直，焊接处要挖出操作坑，其大小要便于焊接操作；
(3) Pipeline welding in ditches must be cleared and straightened before joining, and operation pits should be excavated at the welding site. The size of the pits should be convenient for welding operation.
(4)阀门、配件、补偿器支架等，应在施工前按施工请求预先放在沟边沿线，并在试压前装置终了；
(4) Valves, fittings, compensator brackets, etc. shall be pre-positioned along the ditch edge in accordance with construction requirements before construction and shall be installed before pressure test;
(5)管道水压实验，应契合设计请求和标准规则，办理隐检试压手续，待检验合格后把水泄净，冲洗管道；
(5) Pipeline water pressure test shall conform to the design requirements and standard rules, go through the procedure of hidden inspection and pressure test, and drain the water and flush the pipeline after passing the inspection;
(6)管道防腐，应预先集中处置，管道两端留出焊口的间隔，焊门处的防腐在试压完后再处置； 聚氨酯发泡保温钢管由于聚氨酯硬质泡沫保温层严密地粘结在钢管外皮，隔绝了空气和水的渗入，能起到良好的防腐作用。同时它的发泡孔都是闭合的，吸水性很小。高密度聚乙烯外壳、玻璃钢外壳均具有良好的防腐、绝缘和机械性能。因而，工作钢管外皮很难遭到外界空气和水的腐蚀。只需管道内部水质处置好，据国外材料引见，高温预制直埋保温管的运用寿命可达50年以上，比传统的地沟敷设、架空敷设运用寿命高占地少，施工快，有利环境维护，沧州供给成都聚氨酯发泡保温钢管。
(6) pipeline anticorrosion should be disposed centrally in advance. The gap between the ends of the pipeline should be set aside. The anticorrosion of the welded door should be disposed after the test pressure. The polyurethane foam insulation pipe must be tightly bonded to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, which can prevent the infiltration of air and water and play a good anti-corrosion role. At the same time, its foaming holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, it is very difficult for the outer skin of the working steel pipe to be corroded by the external air and water. As long as the internal water quality of the pipeline is well disposed, according to the introduction of foreign materials, the service life of the high temperature prefabricated directly buried insulation pipe can reach more than 50 years, which occupies less land than the traditional trench laying and overhead laying, and has the advantages of fast construction, favorable environmental maintenance. Cangzhou supplies high-quality polyurethane foamed insulation pipe in Chengdu.
聚氨酯发泡保温钢管直埋供热管道不需求砌筑庞大的地沟，只需将保温管埋人公开，因而大大减少了工程占地，减少土方开挖量约50％以上，减少土建砌筑和混凝土量90％。同时，保温管加工和现场挖沟平行停止，只需现场接头，能够缩短工期约50％以上。
Polyurethane foamed insulating steel pipe directly buried heating pipeline does not need to build huge trenches. It only needs to bury the insulating pipe openly, which greatly reduces the project area, reduces the earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. At the same time, the processing of insulating pipes and digging ditches on site are stopped in parallel, and the construction period can be shortened by more than 50% with only on-site joints.
This article is organized and published by the polyurethane insulation pipe manufacturer. Do you know something about these contents? For more information, please click: http://www.sdhpgy.com. We will have more wonderful content for you to see.
