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Small diameter construction sequence and method

Type
Size 38.1mm (pole ring pipe)
48.6mm
50.8mm
60.5mm
76.3mm
Texture Structural carbon steel pipe (KS D 3566, STK 400)
Specifications and Uses BTC
- 4m, 6m vertical shaft or narrow space (subway, etc.)
- 12m single-level
Ground collapse risk area (high-speed railway, road tunnel, water tunnel, etc.)