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，提出了一种新型的冷输气管道结构--夹砂管。作为研究的结果，证实了管中管可以适应环境变化，因为它允许大的变形，增加了延展性的沙子。另外，通过对周围土体进行人工冻融处理，使其抗弯刚度和抗渗能力的自我恢复成为可能。

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.