聚氨酯直埋保温管又称“管中管”其有“两步法”构成，是由高密度聚乙烯外保护层、聚氨酯硬质泡沫塑管和钢管组成。 保温　层材料为密度60kg/m3至80kg/m3的硬质聚氨酯泡沫，充分添满钢管与套管之间的间隙，并具有一定的粘接强度，使钢管、外套管及　保温层三者之间形成一个牢固的整体。 聚氨酯直埋保温管泡沫具有良好的机械性能和绝热性能，通常情况下可耐温120℃通过改性　或与其它隔热材料组合可耐温180℃。

Polyurethane directly buried insulating pipe is also called "pipe in pipe" composed of "two-step", is made up of high density polyethylene outer protective layer, rigid polyurethane foam and steel tube can form. Insulation material is 60 kg/m3 density 80 kg/m3 of rigid polyurethane foam, fully filled with steel tube and the space between the casing, and have certain bonding strength, make the steel pipe, casing and thermal insulation layer to form a solid whole between. Foam polyurethane directly buried insulating pipe has good mechanical performance and adiabatic performance, usually can be 120 ℃ through modification of heat-resistant or combined with other heat insulation materials can be heat resistance of 180 ℃.

聚氨酯保温直埋管在国外一些发达国家已成为一项比较成熟的先进技术。近十几年，我国供热工程技术人员通过消化、吸收这项　先进技术，正推动着国内管网敷设技术向更高的层次发展。十几年来的实践成果充分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。直埋式保温管是由输送介质的钢管，高密度聚乙烯外套管，以及钢管和外套管之间的硬质聚氨酯泡　沫保温层紧密结合而成。

Directly buried polyurethane thermal insulation pipe in some developed countries abroad has become a relatively mature technology. In recent years, our country heating engineering and technical personnel through digesting and absorbing the advanced technology, is driving the domestic pipeline laying technology to a higher level of development. More than ten years of practice results fully demonstrated polyamine cheese directly buried insulating pipe laying method compared with the traditional cooking and overhead laying, has many advantages. Directly buried insulating pipe are defined by the medium steel pipe, high density polyethylene outer casing, and between steel tube and the outer casing tightly combined with rigid polyurethane foam foam thermal insulation layer.

聚氨酯直埋保温管有十分突出的优点：

Polyurethane directly buried insulating pipe are very prominent advantages:

1、聚氨酯直埋保温管保温性能好，热损失仅为传统管材的25%，长期运行可节约大量能源，显著降低能源成本。

1, polyurethane directly buried insulating pipe heat preservation performance is good, heat loss is only 25% of the traditional pipe, long-term operation can save a lot of energy, significantly reduce energy costs.

2、具有很强的防水和耐腐蚀能力，不需附设管沟，可直接埋入地下或水中，施工简便迅速，综合造价低。

2, have strong ability of water resistant and corrosion resistant, and does not need to attached pipeline, directly buried or water, is simple rapid construction, low comprehensive cost.

3、在低温条件下也具有良好的耐腐蚀和耐冲击性，可直接埋入地下冻土。

3, under the condition of low temperature and has good corrosion resistance and impact resistance, can be directly buried permafrost.

4、使用寿命可达30-50年，正确的安装和使用可使管网维修费用极低。

4, the service life of 30-50 years, correct installation and use can make the network maintenance cost is extremely low.

5、可设置报警系统，自动检测管网渗漏故障，准确指示故障位置并自动报警。

5, can be set up alarm system, automatic detection of pipeline leakage fault, indicates a fault location accurately and automatically alarm.

6、使用寿命可达30-50年。管径：DN15--DN600 厚度:15--50mm 用途:集中供热管道、制冷管道、工业管道等。

6, the service life can reach 30 to 50 years. Thickness of pipe diameter, DN15 - DN600:15 -- 50 mm purpose: central heating pipelines, cooling pipe, industrial pipe, etc.

7、含氧指数：≥27 密度：40--70kg/立方m 憎水率：0.03kg/立方cm 导热系数:0.022kcal/m.h.℃

7, oxygen index: 27 or higher density: 40-70 kg/cubic m hydrophobic rate: 0.03 kg/cubic cm coefficient of thermal conductivity: 0.022 kcal/m.h. ℃

聚氨酯保温直埋管在国外一些发达国家已成为一项比较成熟的先进技术。近几年中国供热工程技术人员通过消化、吸收这项先　进技术，正推动着中国国内管网敷设技术向更高的层次发展。几年来的实践成果充分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中国供热工程上得以迅猛发展的内在动力。

Directly buried polyurethane thermal insulation pipe in some developed countries abroad has become a relatively mature technology. In recent years, China heating engineering and technical personnel through digesting and absorbing the first into the technology, is driving China's domestic pipeline laying technology to a higher level of development. Achievements over the past few years the practice fully proves that get together ammoniac cheese directly buried insulating pipe laying way compared with the traditional channel and overhead laying, has many advantages. It is get together ammoniac cheese directly buried insulating pipe heating engineering in China is able to rapid development of intrinsic motivation.