Tunnel boring machine
device · 1952 · Digital age
A machine that bores a tunnel with a rotating head.
What it is made of
- Hydraulic cylinder — has part. Hydraulic cylinders push the machine forward.
- Electric motor — has part. Electric motors turn the cutting heads.
- Conveyor belt — has part. Spoil is removed by a conveyor.
Principles and materials it uses
- Steel — is made of. The shield and cutter head are steel.
- Cemented carbide — is made of. The cutters are cemented carbide.
History: what it evolved from and what it influenced
- Tunnelling shield — evolved from. A development of the tunnelling shield.