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trenchless horizontal ground loop installer

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Axis Horizontal Directional Drilling method and process...

The HDD rig tunnels beneath surface obstacles and then pulls the pipe back through the pilot hole, leaving the surface undisturbed.

A well planned HDD operation includes preliminary survey of the bore path area, concerning other existing external lines and the soil condition. The choice of the drilling unit depends upon the bore length, the diameter of the pipe to be installed and the soil quality. If the site is suitable for drilling then the normal course taken by the drilling operation is described in the following:

 

This video courtesy of the ISTT shows the process we use

Being able to avoid subsurface obstacles the drilling requires precise localisation and steering. Localisation is carried out following the transmitter-receiver principle (See Interactive Diagram Above). One operator follows the course of the bore head all the time. All Measured values evaluated and directional corrections are passed on to the machine operator via radiophone. It is also possible to directly store the data found in this way, printing them with the help of a PC or Laptop later on. Directional control works according to the "clock-hand principle" via slanted surface of the head; the head changes its direction in correspondence with the clockwise direction.

The finished drilling results in an undisturbed surface and the ground loop pipes neatly spaced ready for electrofusion jointing to complete the loop.

Once all the connections are finished the loop is flushed to remove any debris and pressure tested to make sure the joints are good.

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