Post-tensioned helical anchors simultaneously spin-drilled and grouted and method therefor

A spin drilling and grouting assembly for spin drilling a helical anchor into the ground, said assembly comprising:

• a grout body held rigidly in place and having an internal cylindrical space and a grout port in fluid communication with said internal cylindrical space;
• a hollow cylindrical grout shank sealingly positioned in the internal cylindrical space of said grout body to freely rotate therein and having a top configured to rigidly engage with a torque motor drive, a bottom configured to rigidly engage with a top of said helical anchor and at least one grout hole, said at least one grout hole aligning with the grout port once every complete 360 degree rotation of the grout shank;
• and
• said grout port configured to transfer grout from a pressurized source through said grout hole and into said hollow cylindrical grout shank upon alignment of the at least one grout hole with the grout port,
• said grout shank including a grout plug that completely fills an internal diameter of the grout shank and is located between the at least one grout hole and the grout shank top.