Drill string to the rotary percussion drilling, in particular for the superimposed drilling

摘要

Drill string to the rotary percussion drilling, in particular for the superimposed drilling, whose individual drill rods one end with an external thread (1) and an end with an internal thread (2), whereby the two threads (1, 2) in each case a greater load-bearing edge (9) and a smaller, not - load-bearing flank (10), characterised in that the rod ends in each case a threadless insertion section (3, 4) have, on which the outwardly - and / or internal thread, wherein the profile of the external thread (1) a flattened thread crest (11) and a circular thread root (12), while the profile of the internal thread (2) a circular crest of thread (13) and a flat thread root (14), and wherein at which the external thread (1) end of the rod having a peripheral shoulder (5) is formed, via which the impact effect on a subsequent boring bar can be transferred, and wherein the not - load-bearing flank (10) in each case is constructed in an arc shape and the same radius (r), such as the circular arc-shaped thread crest (13) of the internal thread (2), or as the circular arc-shaped thread root (12) of the external thread..