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

Before digging tunnels, the below actions are needed as like as,
- to set the steel pipes to the excavation surroundings of tunnels properly in array,
- to set the packer inside of the steel pipe
- to put materials of grouting
- to be concreted by the materials
- so, the steel pipe and ground is consolidated as one sector
- and then load to be made by beam of surrounding grounds and pipe, which influences to tunnels
- ground pressures and loads can be devided and decreased

According to methods of injection, pipe
[proofing] grouting engineering is as follows.
1) Single grouting is used in the ground that
  has no tap water when finding crushing
  zone to be single during excavating of
  tunnels as the way of proofing for the
  ground through injecting cement-milk along
  all scope of pipes just in one-shot.
2) Multi-level grouting devides injection in
  several steps and induct the equal
  injection, which is used in order to enhance
  the effects of penetration, so the ground's
  proof efficiency is maximized according to
  components of injection materials.
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.