Helical file

A method of constructing a file by rotating a small diameter (75mm) steel pipe file by
welding a wing of a certain width

When constructing more than 10m, review the buckling load
It is necessary to review long term settlement because construction of rock layer is impossible

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위: 측량오류 PC박스 이동, 아래: 이동·회전 Fujian Xiaman
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Construction examples