• Lost tips with cross-over and casing tubes
  • Lost tips with cross-over and casing tubes
  • Lost tips with cross-over and casing tubes
  • Lost tips with cross-over and casing tubes
  • Lost tips with cross-over and casing tubes
Gouda Geo-Equipment B.V.
Satellietbaan 8
2181 MH Hillegom
The Netherlands

Downloads

No downloads available

Lost Tip Drilling Method (Direct Push)

Despite the fact that CPT penetrometer rigs are not designed for drilling, one can though use the direct push force of the rig for drilling holes up to a depth of 20 meter fast and efficiently by applying the lost tip drilling method.
 
The lost tip is pushed into the ground by means of 55 mm casing tubes using the pushing force of the CPT penetrometer rig.
 
The lost tip assures a very straight bore hole that is slightly larger in diameter than the casing in order to reduce lateral friction on the string of tubes. This makes it possible to reach greater depths.
 
On reaching the desired depth a filter tube / piezometer standpipe can be lowered through the string of casing tubes. Subsequently the string of casing tubes can be retracted using the pulling force of the CPT penetrometer rig.

 
Applications

The lost tip drilling method is successfully applied to place small diameter monitoring well pipes for environmental research. The lost tip remains in the soil when the string of casing tubes is retracted. This does not cause any environmental issues as the lost tip is manufactured of cast iron.
 
The complete set comprises the following items:

Piezocone Dissipation test Water level meter CPT crawler CPT Electric cones Seismic CPT Magnetometer Gouda Jacket cone Soil sampler Dynamic penetrometer Cone Penetration Testing Piezometer CPTU Inclinometer
CPT truck Crawler-Truck Begemann cone Vane tester