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BORED PILES

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The hollow auger pile boring technique has undergone major development over recent years and is now widely used for constructing the foundations of buildings. The principle consists in screwing a hollow shaft auger into the ground to a depth at least equal to the length of the pile to be used; the auger is then extracted from the ground without being unscrewed while, at the same time, concrete is injected through the auger’s hollow shaft. Spectacular improvements made to boring equipment have allowed piles measuring 500 to 1000 mm in diameter to be installed at depths of up to 35 m.



TYPES OF MEASUREMENT

The instrumentation on the site simply, reliably and accurately measures and records :

  • The rig inclination.
  • Depth and drilling rate.
  • Torque and rotation.
  • Concrrete flow rate and volume.
  • Concrete pressure.
  • Instant and average consumption (over-consumption).
  • The profile of the pile constructed.
  • Pressure control at the base of the auger.
  • Pile deviation.



THE INSTRUMENTS

The TARALOG and the DIALOG are bored pile measuring and recording instruments.
 
 
 



THE SENSORS

Specific sensors are used to record the different parameters: the F89 for depth, the IA1620 for the inlicination, the C1650K + SPXX for pressure,the SP400/SP500, the VR28N for speed of rotation, the C16400 + RHTC16 for pump motion and the C16400 for torque, retention pressure (optional) and thrust pressure (optional). TAUPE and PRAD sensors are used to obtain information on pressure at the foot of the auger and on the deviation measured.



THE SOFTWARE

The EXTCT and DXTCT software is used for data application purposes; it generates and provides a simple display of the various parameters.

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