(1)管道下溝前，應檢查溝底標高、溝寬尺寸能否契合設(shè)計請求，保溫管應檢查保溫層能否有損傷，如部分有損傷時，應將損傷部位放在上面，并做好標志，便于統(tǒng)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)管道應先在溝外停止分段焊接以減少固定焊口，每段長度普通在25－35m為宜。下管時溝內(nèi)不得站人，采用機械或人工下管均應將管遲緩、平直公開入溝內(nèi)，不得形成管道彎曲；
(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)溝內(nèi)管道焊接，銜接前必需清算管腔，找平找直，焊接處要挖出操作坑，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)閥門、配件、補償器支架等，應在施工前按施工請求預先放在溝邊沿線，并在試壓前裝置終了；
(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)管道水壓實驗，應契合設(shè)計請求和標準規(guī)則，辦理隱檢試壓手續(xù)，待檢驗合格后把水泄凈，沖洗管道；
(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，應預先集中處置，管道兩端留出焊口的間隔，焊門處的防腐在試壓完后再處置； 聚氨酯發(fā)泡保溫鋼管由于聚氨酯硬質(zhì)泡沫保溫層嚴密地粘結(jié)在鋼管外皮，隔絕了空氣和水的滲入，能起到良好的防腐作用。同時它的發(fā)泡孔都是閉合的，吸水性很小。高密度聚乙烯外殼、玻璃鋼外殼均具有良好的防腐、絕緣和機械性能。因而，工作鋼管外皮很難遭到外界空氣和水的腐蝕。只需管道內(nèi)部水質(zhì)處置好，據(jù)國外材料引見，高溫預制直埋保溫管的運用壽命可達50年以上，比傳統(tǒng)的地溝敷設(shè)、架空敷設(shè)運用壽命高占地少，施工快，有利環(huán)境維護，滄州供給成都聚氨酯發(fā)泡保溫鋼管。
(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.
聚氨酯發(fā)泡保溫鋼管直埋供熱管道不需求砌筑龐大的地溝，只需將保溫管埋人公開，因而大大減少了工程占地，減少土方開挖量約50％以上，減少土建砌筑和混凝土量90％。同時，保溫管加工和現(xiàn)場挖溝平行停止，只需現(xiàn)場接頭，能夠縮短工期約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.
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