聚氨酯保温管在国外一些兴旺国度已成为一项对比老到的抢先技术。近十几年，我国供热工程技术人员经过消化、吸收这项抢先技术，正推进着国内管网敷设技术向更高的层次展开。十几年来的实习作用充沛证明了聚氨酪保温直埋管敷设办法与传统的地沟及架空敷设对比，具有很多利益。这也恰是聚氨酪保温直埋管在我国供热工程上得以迅猛展开的内在动力。
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.
聚氨酯保温直埋管的利益：
Benefits of polyurethane thermal insulation directly buried pipe:
1.降低工程造价。据有关部门测算，双操控供热管道，普通状况下能够降低工程造价的25%(选用玻璃钢做维护层)和10%(选用高密度聚乙烯做维护层)支配。2，热损耗低，节约能源。由于直埋管选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，比其他以前常用的管道保温材料低得多，保温作用行进4~9倍。再有其吸水率很低，约为0.2kg/m2。吸水率低的要素是由于聚氨酯泡沫的闭孔率高达92%支配。低导热系数和低吸水率，加上保温层和外面防水功用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”的状况，大大减少了供热管道的整体热损耗，热网热丢掉为2%，小于世界10%的标准央求。
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，绝缘功用好，运用寿数长。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，隔绝了空气和水的进入，能起到出色的防腐作用。一同它的发泡孔都是闭合的，吸水性很小。高密度聚乙烯外壳、玻璃钢外壳均具有出色的防腐、绝缘和机械功用。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数可达50年以上，比传统的地沟敷设、架空敷设运用寿数高3~4倍。4.占地少，施工快，有利环境维护。
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.
直埋供热管道不需求砌筑无量的地沟，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%。一同，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。
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.国外出产聚氨酪保温预制管，均设有渗漏报警线，一旦管道某处发作渗漏，经过报警线的传导，便可在专用检测仪表上显现出保温管道渗水、漏水的精确方位及渗漏水平的大小，以便通知检渗人员矫捷处置漏水的管段，确保供热管网的平安运转。国内出产的保温管往常末设渗漏报警线，有待补上这一空白。总之，聚氨酯保温直埋管不只具有传统地沟和架空敷设管道难以对比的抢先技术、有用功用，而且还具有显着的社会效益和经济效益，也是供热的有力办法。选用直埋供热管道技术，标志着我国供热管道技术展开现已进入了新的起点。
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.
跟着这项抢先技术的进一步完善和展开，供热管道直埋替代地沟和架空势在必行。聚氨酯保温直埋供热管方案和施工应留心的疑问聚氨酪保温直埋管从节约能源、降低造价、缩短施工周期、维护环境多方面来看，不只具有传统地沟和架空敷设管道难以对比的技术和有用功用，而且具有显着的社会效益和经济效益，但一个优良的直埋供热管道工程还有必要具有方案合理、保温管道质量牢靠1精心施工3个条件。
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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