Patent ID: 8683756

Claim:
A screw foundation system for aligning and fastening in the ground an object substantially in the form of a rod or a post, comprising: a plastic receiving part substantially in the form of a sleeve, having bearing regions on an inner contour of the sleeve and which is configured to be screwed into the ground and which, in the fastened state, accommodates an end region of the rod- or post-like object and surrounds the periphery of said object with spaces at least in certain portions; a curable filling substance which, in the fastened state of the object, is cured and fills the spaces between the end region of the rod- or post-like object and the inner contour of the receiving part; wherein the inner contour has undercuts located in spacing regions adjacent to the bearing regions, the undercuts having an inward surface arranged to fit into intermediate spaces between the bearing regions of the plastic receiving part, the undercuts being arranged for anchoring the cured filling substance; and a screwing-in tool which comprises a dimensionally stable fitting core which can be inserted into the receiving part in order to screw the receiving part into the ground and then bears on the bearing regions on the inner contour of the receiving part and transmits forces and/or torques applied to the tool to the receiving part thereby to screw the receiving part into the ground.