TUBEXGROUT INJECTION bored piles are constructed without vibration and percussive impact on soils in stamped boreholes, without soil excavation onto the surface, which allows its successful use in dense urban areas.

The borehole is formed by rotary drilling using casing pipe with screw-shaped metal drill head/mandrel fixed on its bottom end by welding.

Inside the casing pipe there's a pumping line for high-pressure pumping of flush fluid or slurry to drill head zone, where injecting nozzles are installed in screw-shaped ribs.

When drilling, soils are moved aside and compacted. Grouting of flush fluid to the bottom hole facilitates penetration in sand and gravel grounds or in non-homogeneous geological cross-sections containing solid minerals.

After reaching support grounds horizon up to the reference mark at the pile heel, slurry is pumped under pressure to the contact area between pile and the soil.

When drilling column reaches reference mark at the pile heel, prepared reinforcement cage is lowered into the casing to the reference mark; internal volume of the casing pipe is filled with mixed concrete of the required class.

The casing pipe stays in the soil, and serves as a sacrificial formwork for the pile, thus preventing any negative impacts on the newly-filled concrete from the corrosive medium or underground pressure waters.

Permanent casing pipe and widened pile foot, along with soils compaction and formation of grouted soils area contacting side of the pile during borehole drilling provide high reliability, structural strength and high soil and material load-bearing capacity of the TUBEX GROUT INJECTION bored piles.

TUBEX GROUT INJECTION bored piles can be manufactured with diameter up to 880 mm and length up to 80 m.