The invention concerns an anchoring assembly for securing an element (20) to the ground, the element comprising a hole (22). The invention is characterised by the fact that the anchoring assembly comprises: - an anchor piece (40); - a flexible line (60) having a first end secured to the anchor piece, the flexible line being intended to pass through the hole; - a blocking device (80) comprising an opening, the flexible line extending through the opening, and a blocking means (86) for blocking the sliding of the flexible line in the opening, the blocking device being capable of taking up a first position in which the flexible line can slide in the opening in such a way as to adjust the distance between the blocking device and the anchor piece, and a second position in which the flexible line is blocked in the blocking device in such a way as to prevent the blocking device from moving relative to the anchor piece.