De quoi est fait tunnelling shield
Brunel’s shield for driving tunnels.
- Cutting edge ring — a pour partie. The cutting edge of the shield.
- Steel shield shell — a pour partie. A steel cylinder that holds back the ground.
- Hydraulic cylinder — a pour partie. Jacks push the shield forward.
- Tunnel lining segments — a pour partie. Lining segments installed behind the shield.
- Hydraulic cylinder — utilise. The shield was pushed forward by jacks.
- Fonte — est fait de. Brunel’s shield is a cast-iron frame.