Polyurethane insulating pipe has become a comparatively old and advanced technology in some prosperous countries abroad. Over the past decade, after digesting and absorbing this preemptive technology, heat supply engineers and technicians in China are pushing the domestic pipeline network laying technology to a higher level. Over the past decade, the practice has proved that the laying method of polyurethane tyre thermal insulation directly buried pipe has many benefits compared with traditional trench and overhead laying. This is precisely the inherent power of the polyurethane thermal insulation directly buried pipe in China's heating projects to be rapidly developed.

聚氨酯保溫直埋管的利益：

Benefits of polyurethane thermal insulation directly buried pipe:

1.降低工程造價(jià)。據(jù)有關(guān)部門(mén)測(cè)算，雙操控供熱管道，普通狀況下能夠降低工程造價(jià)的25%(選用玻璃鋼做維護(hù)層)和10%(選用高密度聚乙烯做維護(hù)層)支配。2，熱損耗低，節(jié)約能源。由于直埋管選用聚氨酪硬質(zhì)泡沫塑料停止保溫，其導(dǎo)熱系數(shù)為：λ=0.013—0.03kcal/m·h·oC，比其他以前常用的管道保溫材料低得多，保溫作用行進(jìn)4~9倍。再有其吸水率很低，約為0.2kg/m2。吸水率低的要素是由于聚氨酯泡沫的閉孔率高達(dá)92%支配。低導(dǎo)熱系數(shù)和低吸水率，加上保溫層和外面防水功用好的高密度聚乙烯或玻璃鋼維護(hù)殼，改動(dòng)了傳統(tǒng)地溝敷設(shè)供熱管道“穿濕棉襖”的狀況，大大減少了供熱管道的整體熱損耗，熱網(wǎng)熱丟掉為2%，小于世界10%的標(biāo)準(zhǔn)央求。

1. Reduce the cost of construction. According to the calculation of relevant departments, double-operation heating pipeline can reduce the cost of construction by 25% (using FRP as maintenance layer) and 10% (using high density polyethylene as maintenance layer) under normal conditions. 2. Low heat loss and energy saving. Because polyurethane casein rigid foam is used to stop heat preservation for buried pipes, its thermal conductivity is as follows: lambda=0.013-0.03kcal/m.h.oC, which is much lower than other commonly used piping heat preservation materials, and the heat preservation effect is 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The factor of low water absorption is due to the obturator rate of polyurethane foam is as high as 92%. Low thermal conductivity and low water absorption, together with high density polyethylene (HDPE) or fiberglass reinforced plastics (FRP) maintenance shell with good insulation layer and external waterproofing function, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reduced the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the world's 10% standard.

3.防腐，絕緣功用好，運(yùn)用壽數(shù)長(zhǎng)。直埋保溫管由于聚氨酯硬質(zhì)泡沫保溫層嚴(yán)密地粘結(jié)在鋼管外皮，隔絕了空氣和水的進(jìn)入，能起到出色的防腐作用。一同它的發(fā)泡孔都是閉合的，吸水性很小。高密度聚乙烯外殼、玻璃鋼外殼均具有出色的防腐、絕緣和機(jī)械功用。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(guó)外材料引見(jiàn)，聚氨酪保溫管道的運(yùn)用壽數(shù)可達(dá)50年以上，比傳統(tǒng)的地溝敷設(shè)、架空敷設(shè)運(yùn)用壽數(shù)高3~4倍。4.占地少，施工快，有利環(huán)境維護(hù)。

3. Anti-corrosion, good insulation function, long service life. The directly buried insulation pipe is tightly adhered to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, and the air and water entry can be isolated. Together, its foam holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have excellent anti-corrosion, insulation and mechanical functions. Therefore, it is very difficult for the outer skin of the working steel pipe to be corroded by the external air and water. According to foreign materials, the service life of polyurethane tyre insulation pipeline can reach more than 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying. 4. It occupies less land, constructs quickly and maintains favorable environment.

直埋供熱管道不需求砌筑無(wú)量的地溝，只需將保溫管埋人公開(kāi)，因而大大減少了工程占地，減少土方開(kāi)挖量約50%以上，減少土建砌筑和混凝土量90%。一同，保溫管加工和現(xiàn)場(chǎng)挖溝平行停止，只需現(xiàn)場(chǎng)接頭，能夠縮短工期約50%以上。

Directly buried heating pipelines do not need to build infinite trenches. They only need to bury insulating pipes in public, which greatly reduces the construction area, reduces the amount of earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. Together, 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.

5.國(guó)外出產(chǎn)聚氨酪保溫預(yù)制管，均設(shè)有滲漏報(bào)警線，一旦管道某處發(fā)作滲漏，經(jīng)過(guò)報(bào)警線的傳導(dǎo)，便可在專(zhuān)用檢測(cè)儀表上顯現(xiàn)出保溫管道滲水、漏水的精確方位及滲漏水平的大小，以便通知檢滲人員矯捷處置漏水的管段，確保供熱管網(wǎng)的平安運(yùn)轉(zhuǎn)。國(guó)內(nèi)出產(chǎn)的保溫管往常末設(shè)滲漏報(bào)警線，有待補(bǔ)上這一空白?？傊?，聚氨酯保溫直埋管不只具有傳統(tǒng)地溝和架空敷設(shè)管道難以對(duì)比的搶先技術(shù)、有用功用，而且還具有顯著的社會(huì)效益和經(jīng)濟(jì)效益，也是供熱的有力辦法。選用直埋供熱管道技術(shù)，標(biāo)志著我國(guó)供熱管道技術(shù)展開(kāi)現(xiàn)已進(jìn)入了新的起點(diǎn)。

5. Prefabricated polyurethane cheese insulation pipes produced abroad have leakage alarm lines. Once leakage occurs somewhere in the pipeline and is transmitted by the alarm lines, the precise orientation and leakage level of the insulation pipes can be displayed on the special testing instruments, so as to inform the inspectors to deal with the leakage pipelines quickly and ensure the safe operation of the heating network. Leakage alarm lines are usually installed at the end of domestic heat preservation pipes, which need to be filled in. In a word, polyurethane thermal insulation buried pipe not only has the preemptive technology and useful function which is difficult to compare with traditional trench and overhead pipeline laying, but also has remarkable social and economic benefits. It is also a powerful way to save energy for heating. The selection of directly buried heating pipeline technology marks a new starting point for the development of heating pipeline technology in China.

跟著這項(xiàng)搶先技術(shù)的進(jìn)一步完善和展開(kāi)，供熱管道直埋替代地溝和架空勢(shì)在必行。聚氨酯保溫直埋供熱管方案和施工應(yīng)留心的疑問(wèn)聚氨酪保溫直埋管從節(jié)約能源、降低造價(jià)、縮短施工周期、維護(hù)環(huán)境多方面來(lái)看，不只具有傳統(tǒng)地溝和架空敷設(shè)管道難以對(duì)比的技術(shù)和有用功用，而且具有顯著的社會(huì)效益和經(jīng)濟(jì)效益，但一個(gè)優(yōu)良的直埋供熱管道工程還有必要具有方案合理、保溫管道質(zhì)量牢靠1精心施工3個(gè)條件。

With the further improvement and development of this preemptive technology, it is imperative to bury heating pipelines directly instead of trenches and overhead. The scheme and construction of polyurethane thermal insulation direct buried heating pipe should be noticed. From the aspects of saving energy, reducing cost, shortening construction period and maintaining environment, polyurethane thermal insulation direct buried heating pipe not only has the technical and useful functions that are difficult to compare with traditional trench and overhead pipeline laying, but also has remarkable social and economic benefits, but also has an excellent direct buried heating pipeline project. It is also necessary to have three conditions: reasonable scheme, reliable quality of insulation pipeline and careful construction.

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