Galbiati Group has recently built a 4.5 ton- segment erector for TBM (Tunnel Boring Machine), rotating head, for the excavation of the Bangalore metro.
The segment erector, built by Galbiati, is made up of a fixed structure and a moving one, both made of electro-welded structural metalwork and machined on machine tools.
The fixed part consists of two longitudinal beams on which the sliding guides of wear-resistant material are mounted. The moving part consists of the translating/rotating ring and the pick up system.
Usually positioned behind the cutterhead, the erector is equipped with a mechanical pick up unit in order to grasp segments. The mechanical pick up unit grasps and retains segments for the entire duration of the positioning operations with three independent movements:
- Swinging = ± 5°
- Pitch = ± 5°
- Roll = ± 5°
Erector technical data:
- Total beams length: 7,000 mm
- Overall rotation = ± 200°
- Translation movement speed = 2.800*45 mm/s
- Rotational speed = 2 revolutions per minute
- Maximum load = 4,500 Kg
- Weight = 27,000 Kg
- Intrados diameter = 5,600 mm
Below there is a photo of the erector being assembled.