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This technique involves driving into the ground (horizontally) a steel casing under an obstacle. The steel casing is pounded in using an air hammer operating on compressed air. Once the sleeve has been installed over the desired distance, the contents can be removed using an auger system or compressed air and water. The conduits can then be inserted inside the steel liner. If necessary, the annulus between the steel liner and the conduit can be filled in with cement grout.

As in the case of horizontal drilling, an entry pit and an exit pit must be dug to the required depth. This type of drilling can be done at required grade, but it can not be done when a curbed trajectory is required (as can be done with horizontal directional drilling).

   Drilling under Route 17, Ontario, Canada
   Length drilled: 40 metres (sand/clay)
   Hole diameter: 1060 millimetres
   Conduit installed for the passage of natural gas

We have a wide array of ramming tools manufactured in Germany. In accordance with the diameter of the conduit to be installed, we select the appropriate steel liner, along with the air hammer with the required capacities. Since 1988, we have used this technique many times for various types of projects, from the simplest to the most difficult.

Important : Before any project is begun, exploration boreholes and a complete geotechnical investigation must be conducted so that we can evaluate all possible difficulties and determine the drilling trajectory. Contact us for more information.

Ideally, pipe ramming is used for soft ground that does not contain any blocks (sand, silt, clay and gravel). Formations containing stones, roots and various fill materials are to be avoided. Over the years, we have succeeded in many drilling projects using this technique in order to install conduits for gas, water mains, electricity, sewers and fibre optics. Using our adapted machinery, we can pass through varied obstacles such as: :

Roads and highways;