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Large diameter construction sequence and method

Large diameter steel pipe specifications
Size 114.3mm (4")
139.8mm (5")
165.2mm (6")
Texture Structural carbon steel pipe (KS D 3566, SGT 275)
Specifications and Uses BTC
- 6m x 6m, 5m x 7m: Vertical shafts or narrow spaces (subway, etc.)
- 12m single beam: Places with a high risk of ground collapse. (High-speed railways, road tunnels, water tunnels, etc.)