Insulation structure of steel insulating pipe can be divided into internal sliding type and external sliding type according to different sliding modes.

1、内滑动式：保温构造由工作钢管、硅酸铝、减阻层、微孔硅酸钙、隔热层、不锈钢紧固钢带、铝箔反射层、聚氨酯保温层、外套钢管、外防腐层组成。

1. Inner sliding type: thermal insulation structure is composed of working steel pipe, aluminium silicate, drag reduction layer, micro-porous calcium silicate, thermal insulation layer, stainless steel fastening strip, aluminium foil reflective layer, polyurethane thermal insulation layer, coated steel pipe and external anti-corrosion layer.

外滑动式：保温构造由工作钢管、玻璃棉保温隔热层、铝箔反射层、不锈钢紧固带、滑动导向支架、空气保温层、外护钢管、外防腐层组成。

External sliding type: thermal insulation structure consists of working steel pipe, glass wool thermal insulation layer, aluminum foil reflective layer, stainless steel fastening belt, sliding guide bracket, air thermal insulation layer, exterior steel pipe and exterior anti-corrosion layer.

钢套钢蒸汽保温管由内而外分别是：工作钢管：保证保送介质正常活动；减阻层: 保证工作钢管热胀冷缩自在运动；无机硬质保温层：耐高温，保证与有机保温层之间的界面温度，保证泡沫不被炭化；阻隔、反射层: 保证有机泡沫资料不进入无机硬质耐高温层；反射耐高温层局部热量；聚氨酯泡沫层: 保证介质温度，保证外护管外表坚持常温；外护钢管: 维护保温层免受公开水腐蚀，支撑工作管并能接受一定的外部荷载，保证工作管正常工作；防腐层：维护外钢管防止腐蚀物腐蚀钢管，延长钢管运用寿命。

The steel sleeve steel steam insulation pipe is from inside to outside: the work pipe: ensure the normal activity of the conveying medium; reduce the resistance layer: ensure the work pipe expands and shrink freely; the inorganic hard insulation layer: high temperature resistance, ensure the interface temperature between the organic insulation layer and ensure that the foam is not carbonized; barrier and reflective layer: ensure that the organic foam data do not enter the inorganic hard and high temperature resistant layer; reflection. High temperature resistant layer of local heat; polyurethane foam layer: ensure the medium temperature, ensure the external tube surface to adhere to the normal temperature; external protection steel pipe: maintain the insulation layer from open water corrosion, support the work pipe and accept certain external load, ensure the work of Guan Zhengchang work; anti-corrosion layer: protect the external steel pipe to prevent corrosivity corrosion steel pipe, prolong the service life of the steel pipe.

钢套钢直埋保温管的组成局部是，保送介质的钢管，防腐外套钢管，还有钢管和钢管之间用来填充的超细玻璃棉互相组合而成。钢套钢直埋保温管还有另外一种合成方式，那就是采用石墨和硅钙瓦管壳，加上用来填充的聚氨酯泡沫。

The components of steel-lined steel direct-buried insulation pipes are composed of steel pipes for medium delivery, anti-corrosion coated steel pipes, and ultra-fine glass wool for filling between steel pipes and steel pipes. Another way to synthesize steel sleeve steel directly buried insulation pipes is to use graphite and silicon calcium tiles, plus polyurethane foam for filling.

钢套钢直埋保温管其实真正的做好维护管的首要，就是要做好管道的紧密防水能否牢靠，还有在机械强度上有良好的性能，由于钢套管是运用强度高采用焊接衔接的办法，所以在防水的密封性能还是十分高的，另重要的是其耐高温性能也是也不是别的外维护管可以相比的。

In fact, the first thing to do a good job of maintenance pipe is to do a good job of tight waterproofing of the pipe, and have good performance in mechanical strength. Because the steel casing is welded joints with high strength, the sealing performance of waterproofing is very high, and the other important thing is that its high temperature resistance is also not other external maintenance pipe can be used. By comparison.

特别是在公开水位高的地域可以正常运转，在外维护层还采用了十分巩固、密闭的钢管外壳。钢套钢直埋保温管埋设技术主要的功用就是做好防水和防漏，并且可以好抗渗、抗压，还是全封锁的埋设技术，这项技术在直埋敷设技术在公开水位较高地域运用的有很好的效果。

Especially in areas with high open water level, it can operate normally. In the outer maintenance layer, a very consolidated and sealed steel tube shell is also used. The main function of the burying technology of steel-jacketed direct-buried insulating pipe is to do well in waterproof and leak-proof, and to be the best anti-seepage and anti-compression, or to be the fully blocked burying technology. This technology has a good effect in the areas with high open water level.