| 摘要 |
Ground screw for anchoring the soil in aboveground devices, consisting of shaft (1), which underground part (3) with the helix screw (2) is equipped with a tip (4), has the cylindrical shaft (1), whose total length L1 is from 15 to 30 D . Aboveground part L3 has the length from 10 to 20 D, underground part (2) is equipped with a tip length of at least 1.5 D, helical thread has a depth (h) at least 0.1 D width (m) of at least 0.15 D and pitch of thread (s) is at least 0.2 D. Tip (4) of underground part (3) may have the form of a cone or pyramid with a at least three walls, top angle of which is max 30 °. |
