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We have recently built the largest segment erector, for its size and weight, we have ever made.
Galbiati has designed and built this segment erector with a maximum capacity of 9.7 tons, intended for a Tunnel Boring Machine that will be used for an important project called “Hiroshima Project” in Japan. The TBM for which the erector has been built, with a 13.2 meter diameter cutter head, will have the task of creating a tunnel for the construction of lane 5 of the Hiroshima expressway in Japan.
The segment positioning erector, in question, consisting of the translating/rotating ring with rollers and the pick-up unit, is made up of a single moving structure, made of electro-welded structural metalwork and machined on machine tools.
We started with the mechanical machining of 4 sectors that, assembled, make up the rotating ring of the erector with a diameter of 13.5 meters. Given the size and weight, the rotating ring of the erector made assembly operations difficult, so that it has not been possible to position the erector vertically.
The erector in question is equipped with a mechanical segment pick-up unit. The pick-up unit has the task of grasping and maintaining the segment during the positioning operations.
Erector technical data:
- Translating speed = 100 mm/sec
- Rotational speed = 1.5 rpm
- Maximum load capacity = 9,700 kg (segment)
- Total weight = 75,900 Kg
- Intrados diameter = 12,200 mm
During the erector testing operation, attended by the end customer, with full enthusiasm and satisfaction, we made a video for checking the axial and radial strokes, the ring lifting, translation and rotation operations and finally, the pick-up unit rotation and dropping.
The video and photos taken with the end customer during the erector assembling at our workshops are shown below.
