What tunnelling shield is made of
Brunel’s shield for driving tunnels.
- Cutting edge ring — has part. The cutting edge of the shield.
- Steel shield shell — has part. A steel cylinder that holds back the ground.
- Hydraulic cylinder — has part. Jacks push the shield forward.
- Tunnel lining segments — has part. Lining segments installed behind the shield.
- Hydraulic cylinder — uses. The shield was pushed forward by jacks.
- Cast iron — is made of. Brunel’s shield is a cast-iron frame.