| 摘要 |
A shaft of a pile or earth anchor comprises extension members that are added as the shaft is forced into the ground. The joints are held together by tongues (22, 23; 14, 15; 33, 34) that are welded to the forward end of each extension member and bent rearwardly around holds (24, 25; 16, 17; 35, 36) on the rear end of the preceding extension member. |
