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Tunnel boring machine double shield TBM - ø 1.6 - 15 m
The Double Shield TBM operates through the main propel cylinders, which are extended to push the cutterhead forward. It is also used to provide support as the swivelling cutterhead chops off the rock. During normal operation, the gripper shoes are activated, enabling them to push against the tunnel walls.The telescopic shield covers everything underneath the machine. The shield extends, which gives provides protection to the components from the ground. The segment erector is attached to the gripper shield for the erection of conrcete tunnel lining segments. Also, the gripper shield is idle while operation is ongoing.
Thsi equipment consists of a telescopic sheild, which is a small inner shield that slides inside a bigger one, a tail shield, and a gripper shield.