Hollow Stem Piling Process  

The company developed a hollow stem piling process allowing simultaneous auger removal and grout injection in small-diameter boreholes (50mm), previously unachievable. The innovation centred on a proprietary grout swivel maintaining constant grout pressure, preventing borehole collapse in unstable, water-bearing soils.

Technological challenges included sustaining grout pressure, preventing clogging, and making the process efficient for a two-person team. Through iterative testing, the team refined the swivel design, optimised a 5:1 sand-cement mix, and streamlined workflows using remote controls and improved grout containment. The outcome was a more stable, efficient piling method, reducing costs by up to 50% and grout waste by 20%.