聚氨酯保温直埋管在国外一些兴旺国度已成为一项比拟成熟的先进技术。近十几年，我国供热工程技术人员经过消化、吸收这项先进技术，正推进着国内管网敷设技术向更高的层次开展。十几年来的理论成果充沛证明了聚氨酪保温直埋管敷设方式与传统的地沟及架空敷设相比，具有诸多优点。这也正是聚氨酪保温直埋管在我国供热工程上得以迅猛开展的内在动力。
Polyurethane thermal insulation directly buried pipe has become a comparatively mature advanced technology in some prosperous countries abroad. Over the past decade, through digestion and absorption of this advanced technology, China's heating engineers and technicians are pushing the domestic pipeline network laying technology to a higher level. Over the past decade, the theoretical results have proved that the laying method of polyurethane tyre thermal insulation buried pipe has many advantages compared with traditional trench and overhead laying. This is also the inherent driving force for the rapid development of polyurethane thermal insulation buried pipe in China's heating projects.
聚氨酯保温直埋管的优点：
Advantages of polyurethane thermal insulation directly buried pipe:
1、降低工程造价。据有关部门测算，双管制供热管道，普通状况下能够降低工程造价的25%(采用玻璃钢做维护层)和10%(采用高密度聚乙烯做维护层)左右。
1. Reduce the cost of construction. According to the calculation of relevant departments, double-pipe 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、热损耗低，节约能源。由于直埋管采用聚氨酪硬质泡沫塑料停止保温，其导热系数为：λ=0.013—0.03kcal/m·h·oC，比其他过去常用的管道保温资料低得多，保温效果进步4~9倍。再有其吸水率很低，约为0.2kg/m2。吸水率低的缘由是由于聚氨酯泡沫的闭孔率高达92%左右。低导热系数和低吸水率，加上保温层和外面防水性能好的高密度聚乙烯或玻璃钢维护壳，改动了传统地沟敷设供热管道“穿湿棉袄”的情况，大大减少了供热管道的整体热损耗，热网热损失为2%，小于10%的规范请求。
2. Low heat loss and energy saving. Because polyurethane rigid foam plastic is used to stop the heat preservation of directly buried pipes, its thermal conductivity is as follows: lambda = 0.013-0.03kcal/m.h.oC, which is much lower than other commonly used heat preservation data of pipes in the past, and the heat preservation effect is improved by 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The reason for low water absorption is that the polyurethane foam has a closed porosity of 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 waterproofing performance, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international standard requirements of 10%.
3、防腐，绝缘性能好，运用寿命长。直埋保温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，聚氨酪保温管道的运用寿命可达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, 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 outside 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.
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