Description

Forepoling, also known as tube umbrella, is an application used to strengthen tunnel roof in broken rock conditions. The drilling system consists of casing tubes which are drilled through the overburden as an umbrella and filled with grouting.

The casing System allows easy driving of the casing tubes into the ground with low torque demand.

Any excavation process directly affects the distribution of existing tensions in a rock mass. In order to minimize the effect of these new tensions, support systems have been developed that allow for later work in much safer working conditions until the final support systems have been installed

APPLICATIONS

  • Tunnel entry portal support
  • Can be used as a drainage system
  • Advances where geological failures are present
  • Tunneling in unstable terrain
  • Ground, rock, even slopes on bad terrain
  • Slope stabilization and civil applications in urban areas

Benefits of Pilot Push Tubes:

  • Quick drilling percussion – rotary method
  • Drilling and extension process at the same time
  • Different kinds of umbrella systems to different requirements
  • The system used in difficult conditions
  • The flexibility of systems thanks to various lengths of tubes and diameters
  • Choice of drilling bit in dependent on kind of mountain hole
  • Simple installation
  • Optimization of the system for the client’s requirements

Technical Details of Pilot Push Tubes:

 

 

System

Casing PipeRing BitPilot Bit 

 

Thread

Outer DiameterWall ThicknessOuter DiameterInner DiameterOuter Diameter
 

 

GCPL 76.3

 

 

76.3

6 

 

87

 

 

42

 

 

59

 

 

R32

7
8
 

 

GCPL 88.9

 

 

88.9

4 

 

100

5678.5 

 

T38/R38

6.5 

50

 

70

8
 

 

GCPL 101.6

 

 

101.6

7 

 

114

6585 

 

T38/R38

8 

60

 

79

10
 

 

GCPL 114.3

 

 

114.3

7 

 

126

7698.5 

 

T38/T45

8 

72

 

92

10
 

 

GCPL 139.7

 

 

139.7

6.6 

 

150

100124 

 

T45/T51

8 

97

 

117.5

10

 

  • Standard Pilot Push Tubes Length = 3meter
  • Recommended Length for use = 12meter
  • Tubes are available in both option (With perforation and without perforation)
  • Single use ring is for permanent casing drilling
  • Used for all ground condition and short drilling
  • All bits are available with spherical or ballistic buttons

 

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