High pressure injection drill rod has interlocked insertion and holding ends to give a precise positioning of the jet head to inject liquid cement to seal and stabilize the walls of the pile drilling

摘要

The high pressure injection drill rod assembly, to inject a liquid cement into the walls of pile drillings, has an insertion (2) and a holding (3) end as matching interlocking sections, with a locking mechanism against rotation and loosening (5,6). The rotating lock (5) has a polygonal pin (9) and polygonal sleeve, and the lock (6) to prevent the sections pulling apart has a lateral bolt through the wall of the sleeve, together with a groove (29) at the pin (9).