Development of Chilled Gas Pipeline Complying with Environmental Change, Innovation due to Composite Materials

在天然气储量丰富的北方寒冷地区，开发了一种创新的冷输管道结构——管内充砂管道。研究结果表明，管中管允许较大的变形，由于砂石的作用，增加了管中管的延性，可以适应环境的变化。此外，通过对周围土体进行人工冻融，可以实现抗弯刚度的自我恢复和防渗漏。

A pipe-in-pipe filled with sand was developed as an innovative structure for chilled gas pipeline in northern cold regions where a plenty of natural gas is reserved. As a result of the study, it is confirmed that the pipe-in-pipe can comply with environmental change due to increased ductility by sand because it allows large deformation. In addition, self recovery in flexural rigidity and anti-leaking becomes possible by artificial freezing and thawing of surrounding soil.