The disclosed device comprises a hollow section (1.1 - 1.7) having a hollow space (4) which is open at least at its upper end for the insertion of a post (17.1; 17.2) and the hollow cross section which is essentially closed on all sides corresponds to the cross section of the inserted post (17.1; 17.2) to hold it and which has at least one anchoring projection (9) on its outer side (7) with at least one anchoring aperture (10.11) to anchor the hollow section (1.1 - 1.7) in the foundation (20).