Spirafix screw piles, provide an alternative foundation solution for ground-mounted solar PV systems where conventional driven piles are restricted by ground conditions, shallow refusal, limited achievable embedment or insufficient uplift resistance.
They can be considered where a ballasted or gabion foundation is not preferred and a secure, ground-anchored solution is required.
Spirafix screw piles are installed by impact driving. As each anchor is driven into the ground, its helical profile allows it to rotate naturally and develop a secure connection with the surrounding ground.
For HTR Solar mounting systems, the Spirafix screw piles are connected through project-specific brackets to a horizontal foundation member. This horizontal member is then connected to the table uprights, creating a coordinated load path between the solar mounting structure and the ground anchors.
The number, diameter, length and spacing of the Spirafix , together with the horizontal member and bracket connections, are developed according to the table reactions, ground conditions and results of project-specific site testing.
