聚氨酯保溫管在國外一些興隆國度已成為一項比較成熟的技術。近十幾年。正推進著國內管網敷設技術向更高的層次展開。十幾年來的理論效果充沛證明了聚氨酪保溫直埋管敷設方式與傳統(tǒng)的地溝及架空敷設相比，國供熱工程技術人員經過消化、吸收這項技術。具有諸多優(yōu)點。這也正是聚氨酪保溫直埋管在國供熱工程上得以迅猛展開的內在動力。
Polyurethane insulation pipe has become a mature advanced technology in some prosperous countries abroad. Over the past decade. It is pushing domestic pipeline network laying technology to a higher level. Over the past decade, the theoretical effect has proved that the laying method of polyurethane tyre thermal insulation buried pipe is better than the traditional trench and overhead laying method, and the national heating engineers and technicians have digested and absorbed this advanced technology. It has many advantages. This is precisely the internal power of the polyurethane thermal insulation directly buried pipe in the national heating project.
1.降低工程造價。據(jù)有關部門測算，雙管制供熱管道，普通情況下可以降低工程造價的25%采用玻璃鋼做維護層）和10%采用高密度聚乙烯做維護層）左右。
1. Reduce the cost of construction. According to the calculation of relevant departments, double-pipe heating pipeline can generally reduce the cost by 25% using FRP as maintenance layer and 10% using high density polyethylene as maintenance layer).
2熱損耗低，節(jié)約能源。由于直埋管采用聚氨酪硬質泡沫塑料中止保溫，其導熱系數(shù)為：λ=0.0130.03kcal/mhoC比其他過去常用的管道保溫資料低得多，保溫效果進步4~9倍。再有其吸水率很低，約為0.2kg/m2吸水率低的緣由是由于聚氨酯泡沫的閉孔率高達92%左右。低導熱系數(shù)和低吸水率，加上保溫層和外面防水性能好的高密度聚乙烯或玻璃鋼維護殼，改動了激進地溝敷設供熱管道“穿濕棉襖"狀況，大大減少了供熱管道的整體熱損耗，熱網熱損失為2%小于10%規(guī)范懇求。
2. Low heat loss and energy saving. The thermal conductivity of the directly buried pipe is 0.0130.03kcal/mhoC, which is much lower than that of other commonly used pipes, and the thermal insulation effect is improved by 4-9 times. In addition, the water absorption rate is very low. The reason for the low water absorption of 0.2kg/m2 is that the closure rate of the polyurethane foam is about 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 waterproof performance, have changed the situation of radical trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of heating pipeline, and the heat loss of heating network is less than 2% of the International 10% code request.
3.防腐，絕緣性能好，運用壽命長。直埋保溫管由于聚氨酯硬質泡沫保溫層緊密地粘結在鋼管外皮，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。因此，工作鋼管外皮很難遭到外界空氣和水的腐蝕。只需管道內部水質處置好，據(jù)國外資料引見，聚氨酪保溫管道的運用壽命可達50年以上，比傳統(tǒng)的地溝敷設、架空敷設運用壽命高3~4倍。
3. Anti-corrosion, good insulation performance and 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, which can isolate the infiltration of air and water, and can play a good anti-corrosive effect. At the same time, the foaming holes are closed and the water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of working steel pipe is very difficult to be corroded by external air and water. According to foreign data, the service life of polyurethane thermal insulation pipeline can reach more than 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying.
4.占地少，施工快，有利環(huán)境維護。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，因此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)場挖溝平行中止，只需現(xiàn)場接頭，可以縮短工期約50%以上。
4. It occupies less land, constructs quickly and maintains favorable environment. Directly buried heating pipelines do not need to build huge trenches. They only need to bury insulating pipes openly. Therefore, the construction area is greatly reduced, the excavation amount of earthwork is reduced by more than 50%, and the amount of civil construction and concrete is reduced by 90%. At the same time, the processing of insulating pipes and the excavation of trenches on site are stopped in parallel, and the construction period can be shortened by more than 50% with only the on-site joints.
5.國外消費聚氨酪保溫預制管，均設有滲漏報警線，一旦管道某處發(fā)作滲漏，經過報警線的傳導，便可在專用檢測儀表上顯現(xiàn)出保溫管道滲水、漏水的準確位置及滲漏程度的大小，以便通知檢滲人員疾速處置漏水的管段，保證供熱管網的平安運轉。國內消費的保溫管目前末設滲漏報警線，有待補上這一空白。總之，聚氨酯保溫直埋管不只具有激進地溝和架空敷設管道難以比較的技術、適用性能，而且還具有顯著的社會效益和經濟效益，也是供熱的有力措施。采用直埋供熱管道技術，標志著我國供熱管道技術展開曾經進入了新的起點。隨著這項技術的進一步完善和展開，供熱管道直埋取代地溝和架空勢在必行。
5. Foreign consumer polyurethane insulation prefabricated pipes are equipped with leakage alarm lines. Once leakage occurs somewhere in the pipeline, through the transmission of the alarm lines, the exact location and degree of leakage of the insulation pipes can be displayed on the special testing instruments, so as to inform the inspectors to quickly dispose of the leakage pipeline section and ensure the safe operation of the heating network. At present, the leakage alarm line for domestic consumer heat preservation pipes has been set up, which needs to be filled in. In a word, polyurethane thermal insulation buried pipe not only has advanced technology and applicability which is difficult to compare with radical trench and overhead pipeline laying, but also has significant social and economic benefits. It is also a powerful measure for heating energy saving. The adoption of directly buried heating pipeline technology marks a new starting point for the development of heating pipeline technology in China. With the further improvement and development of this advanced technology, it is imperative to replace underground ditches and overhead by burying heating pipelines directly.
