The frame and working principle of the detecting system used for inspecting cracks on the inner wall of smallpipe is introduced.
介绍了一种新型管道检测摄像系统的结构和工作原理。
2
The pump pouring liquid with the supporting of steel by a smallpipe is one of the add craft in tunnel construction and it is fit for tunnel project in bad geology condition.
超前小导管注浆加钢支撑是隧道工程辅助开挖的一种施工工艺,特别适用于地质条件不良的隧道施工。
3
Compared with gravity drainage system, it has the advantages of smallpipe diameter and installing space, non-sloped suspended pipe, less sewage connecting and underground pipes and etc.