一、内滑动外固定
I. Internal sliding and external fixation
聚氨酯保温钢管受热收缩时，一定会有所变化地运动，产生位移现象也是有可能的，而保温构造层与外套管普通都是一种整体构造。外固定即工作钢管和外维护管一定要一同固定才算好，在每一段管道和补偿器的两端，都要设两个很大的钢筋混凝土支墩，这样保证管道的固定不便还是有点益处的。外固定由于需求设钢筋混凝土支墩，所以施工占地大、投资多、工期有时分还长，所以还是之前留意一下比拟好。依据想用的外护管的不同，又可分为塑套钢构造、玻璃钢套钢构造和钢套钢构造。经过理论证明，塑套钢构造目前曾经不顺应直埋蒸汽管道的开展趋向。
When polyurethane insulating steel pipe is heated and contracted, it will change its motion, and it is possible to produce displacement phenomenon. The insulating structure layer and outer casing are generally a kind of integral structure. External fixing means that the working steel pipe and the external maintenance pipe must be fixed together before they are considered good. Two large reinforced concrete piers should be installed at both ends of each section of the pipe and the compensator, so as to ensure the inconvenience of pipe fixing, it is still a little beneficial. Because of the need for reinforced concrete piers for external fixing, the construction area is large, the investment is large, and the construction period is sometimes longer, so it is better to pay attention to the comparison before. According to the difference of envelope, it can be divided into plastic envelope steel structure, FRP envelope steel structure and steel envelope steel structure. It has been proved theoretically that the plastic sleeve steel structure did not conform to the development trend of directly buried steam pipeline at present.
二、内滑动内固定
II. Internal sliding internal fixation
把工作钢管经过一定的构造方式固定在外维护管上，充沛应用外维护管的强度和刚度，以及外维护管与土壤之间的摩擦力来进一步使内管固定好，不用钢筋混凝土构造固定，可俭省钢筋混凝土支墩的建造。只要以钢管作为外维护管才可能采用内固定方式，固定端有隔热设备，以减少热桥效应，同时外维护管应有足够的强度，以满足管道程度推力的请求。对"钢套钢"保温构造，采用内固定构造具有很大的优越性。依据外护管的不同，又可分为钢套钢构造和钢套钢复合构造。
Fixed the working steel pipe on the external maintenance pipe through a certain construction mode, fully utilized the strength and stiffness of the external maintenance pipe, and the friction between the external maintenance pipe and the soil to further fix the internal pipe, without the use of reinforced concrete structure, the construction of reinforced concrete piers can be saved. As long as the steel pipe is used as the external maintenance pipe, it is possible to adopt the internal fixation method. The fixed end has heat insulation equipment to reduce the thermal bridge effect. At the same time, the external maintenance pipe should have sufficient strength to meet the requirement of pipeline thrust. It has great advantages to adopt internal fixing structure for "steel sleeve steel" thermal insulation structure. According to the difference of outer guard pipe, it can be divided into steel jacket structure and steel jacket composite structure.
三、外滑动内固定的方式巧应用
3. Skillful application of external sliding internal fixation
把聚氨酯保温管的保温资料和工作钢管经过一定工序使之分离，在后呢就会构成一个整体，保温构造和工作钢管在管道热收缩时一定是一同运动的。外套管与保温构造层之间有10~20mm的间隙，这样的设计构造不只可以起到良好的保温作用，关于排潮来说也是一种牢靠的通道。工作钢管与外套管之距离一段间隔就用一组隔热导向支架来停止支撑，这样能够减少管道位移时的摩擦力，使之在挪动的时分会愈加的烦琐快速。
The insulation data of polyurethane insulating pipe and working steel pipe are separated by a certain process, and then they will form a whole. The insulation structure and working steel pipe must move together when the pipe shrinks. There is a gap of 10-20 mm between the outer casing and the thermal insulation structure layer. Such a design structure can not only play a good role in thermal insulation, but also be a reliable channel for tidal discharge. The distance between the working steel pipe and the outer sleeve is separated by a set of heat-insulating guide brackets to stop the support, which can reduce the friction force when the pipe displaces and make it more tedious and fast when it moves.
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