Drift tee junction (Underground Mine and Shaft Works)
A 4 m flat backed intersection with three arched drift openings and a closed east wall, supported by four steel corner columns, a ring beam and roof bolts.
- 格式
- GLB
- 文件大小
- 48 KB
- 三角面
- 972
- 许可
- CC0 1.0
A 4 m flat backed intersection with three arched drift openings and a closed east wall, supported by four steel corner columns, a ring beam and roof bolts.