无补偿冷安装直埋供热管道的可靠性研究

发布时间：2018-04-15 13:01

本文选题：直埋供热 + 无补偿冷安装　；参考：《西安建筑科技大学》2014年硕士论文

【摘要】：直埋供热管道技术最近几年以来在设计和施工中发展迅速，我国东北地区是应用最早也是最广泛的地区。在改建、扩建以及新建的热水供热管道工程中大多数采用直埋的敷设方式。近年来，已经有一部分地区城市的供热管网采用了无补偿冷安装直埋敷设方式，从使用效果来看，该敷设方式实用效果很好，但是，在推广的时候遇到了一些问题:一些热力公司在实际实施中反映,采用该方式供热时，供热管道在供热时不发生明显伸长，然而有很多专家对这一结论存在疑虑。因此，，有必要对该问题做进一步的研究，完善该供热方式的理论。本论文对无补偿冷安装直埋供热方式受热时管道热伸长问题进行了理论和实验研究。根据管道受力情况建立管道在地上和直埋至地下的受热伸长计算公式，通过理论计算可知，供热管道在受热时，确实发生伸长，其伸长量和规范中所给出的参数基本一致。鉴于热力公司在实际实施中供热管道没有发生明显伸长，理论计算和实际相差较大的问题，本论文进行预制直埋供热管道实验研究。通过实验可知，供热管道在供热时的确是发生了伸长，但是，其伸长的方式并不是理论计算的那样沿着供热管道轴线方向，而是，在供热管道的焊接位置，存在夹角的地方，发生了左右摆动，正是这样的左右摆动，把整个管道要沿轴线伸长的量，分散到了各个焊接位置也就是存在微小的夹角的地方，其管道总的伸长量不明显。研究表明，在满足一定的安全性条件下该敷设方式运行可靠。
[Abstract]:The technology of direct-buried heating pipeline has developed rapidly in design and construction in recent years. Northeast China is the earliest and most widely used area.In the reconstruction, expansion and construction of hot water heating pipeline projects, most of them are directly buried.In recent years, heating networks in some cities have adopted direct buried laying without compensation cold installation. From the use effect, the practical effect of the laying method is very good, but,Some problems have been encountered in the process of popularization: some thermal companies have reflected in practice that the heating pipeline does not elongate obviously when heating is used in this way. However, many experts have doubts about this conclusion.Therefore, it is necessary to further study the problem and improve the theory of the heating mode.In this paper, the heat elongation of pipeline is studied theoretically and experimentally.According to the stress condition of the pipeline, the formula of the heating elongation of the pipeline is established. The theoretical calculation shows that the heat supply pipeline is really elongated when it is heated, and its elongation is basically consistent with the parameters given in the code.In view of the fact that there is no obvious elongation of heating pipeline and the difference between theoretical calculation and practice is large, this paper carries out experimental research on prefabricated direct-buried heating pipeline.Through the experiment, we can know that the heating pipeline does have elongation when heating, but the way of its elongation is not along the axis direction of heating pipeline as calculated theoretically, but in the place where the welding position of heating pipe is where the angle exists.The right and left wobble happened, which spread the whole pipeline along the axis to the place where the welding position is tiny angle, the total elongation of the pipeline is not obvious.The research shows that the laying mode is reliable under certain safety conditions.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU995.3

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