Home> Products > Direct boring steel pipe & Multi phase steel pipe
 

Main usage
1. Tunnel subsidiary engineering in time of
  constructing road, underground of rail-way
2. Tunnel subsidiary engineering in time of
  constructing underground and the lower
  part of construction parts.
3. Tunnel subsidiary engineering in time of
  constructing tunnel and tunnel's inside
4. Miscellaneous subsidiary engineering
  except engineering for piercing of crushing
  zone, stream, underwater, crumble ground.

 Working process