In soft to medium soil types a larger diameter casing (e.g. 190 mm) can be driven down to considerable depth using a MidSonic drill head with a power pack without simultaneous injection of water or air.
The MidSonic drill head with a special 165 KW PowerPack generates rotation with simultaneous powerful sonic vibration. This assures a perfectly straight borehole. Preferable no drilling fluid or air injection is used, so no soil is flushed or blown upward, assuring an extremely tight fitting of the casing in the soil.
In a typical Dutch soil (marine and fluvial sediments) the drilling time to reach 35 meters depth with a 190 mm casing was less than seven minutes. In that project, carried out by the worldwide working contractor Royal Dutch BAM, a Gewi anchor was installed. During retrieval of the drill string, grout was injected via a swivel under considerable pressure. Purpose for the pile driving within this project was creating a foundation for an aqua duct. The 35 meter long pile consisted of 3, 2 and 1 meter long lengths of normal sonic casing. A large rig with a mast of 50 meters was used to allow drilling down and retrieving the pile without the need for connecting or breaking casing. Also it kept the working area free from grout flowing out of each casing section to be removed. In this way pile driving productivity can be multiplied by 3-4 compared to conventional pile installation techniques. SonicSampDrill also supplies a fully customized 165 KW PowerPack to power the drill head. It is remote controlled and has the exact features to interact with the drill head hydraulics regarding cooling, pressure controls, filtration etc. There is a separate leaflet on the MidSonic PowerPack.
Specifications MidSonic Mast
- Total mast length 7.30m (with winch 7.46) for rods up to 3 m
- Drill head can shift left for borehole access
- Telescoped mast: 1 st stage 4.95m; 2 nd stage 7.46 (incl winch)
- Tool boxes on skid
- Pull up and down force 100 kN
- Mast dump 1500mm (approx.)
- Trolley feed rate 0.4 m/s; fast feed rate 0.6 m/s
- Double foot clamp with breaker for Ø 50-280mm
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