PIPE ROOFING SYSTEM & CASING SYSTEM
PIPE ROOFING SYSTEM
Pipe Roofing System is a support system used in loose ground conditions in conventional and mechanized tunneling. It is used to enhance ground properties to stabilize and reduce risk in tunnel works. It is a method of supporting tunnel by driving pipes ahead of excavation. It is also used in developing the portal sections.
Pipe Roofing Components
- Starter Pipe: First Pipe Welded with Ring Bit on one end & female threading on other end, which can be perforated / non- perforated as per the design requirement.
- Extension Pipe: Male – Female threaded pipe for extension, which can be perforated / nonperforated as per the design requirement.
- Pilot Bit
- Drill Rods
- Grout Plugs / Injection Cap
The installation of the Pipe Roof System is simple and quick and has the following effects.
- Reducing the ground loss by creating a boundary of stiff material between the soil and tunnel crore.
- Stabilizing the ground in the area of newly excavated and get unsupported excavation round.
- Distributing loads acting upon the tunnel roof above the freshly excavated round into the in-site ground ahead of the face and the lined tunnel behind the face.
- Confinement of the tunnel excavation area ahead of the tunnel face.
- Enhancing tunnel face stability by reducing loads acting upon the tunnel face.
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Reducing surface settlement.
