Tunnel Boring Machine Erector

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.