Push drilling is a horizontal drilling method used to install steel sleeve pipes under obstacles. Generally, these boreholes are over short distances, maximum 50 meters depending on the soil and the diameters. This horizontal drilling method allows us to install steel pipes up to 1,800 mm in diameter.
Here are the different steps for this type of drilling:
- Following the excavation of an entrance pit, a system of guide rails is installed in the desired alignment, located at one end of the crossing. These rails will support the pipe to be driven as well as a pneumatic hammer located at the rear and attached to two winches which will exert a static force from the hammer against the steel pipe.
- After strengthening the front part of the pipe, it is pushed by the combined effect of the winches (static force) and the hammer (dynamic force). It is the same principle as driving a pile, but horizontally. With the end of the pipe open, the soil remains in place inside it.
- Once the first section of the pipe is driven in, the hammer is stopped and it is retracted to the back of the guide rails. A second pipe section is then positioned behind the first and is welded along the full thickness of the pipe wall (complete penetration).
- Driving resumes, with the hammer pushing the rear of the newly welded pipe section. The process continues this way until the crossing is completed.
- Finally, the soil contained in the center of the pipe is removed.
Here are some of our achievements in pipe-ramming:
|Year||City||No. of drillings||Length (m)||Type of pipe||Type of soil||Obstacle|
|2015||St-Jean-sur-Richelieu||2||25 ea.||Steel 400mm||Soft soil||Railway|
|2016||MCMasterville||1||30||Steel 300mm||Soft soil||Railway|
|2017||Lévis||2||35 ea.||Steel 600mm||Soft soil||Autoroute 20|
|2018||Brossard||3||35 ea.||Steel 600mm||Soft soil||Railway|
|2019||St-Eustache||4||345 ea.||Steel 750mm||Soft soil||Culvert|
|2020||Varennes||4||25||Steel 1050mm||Soft soil||Railway|