Method of transmission of information along assembly of drill tubes used in jet grouting when fabricating concrete piles, uses coil at lower end of drill assembly to gather transducer data and coil near top to deliver data to reader

摘要

The data transmission system has at a first coil (40) near the lower end of the drill train, in an annular space (38) between the external wall and the internal conduit of the drill section. Transducers (44, 56) apply a signal representative of the data to the coil. The drill sections have conductive walls. A second coil (46), at the upper end of the train of drills, delivers (48) the signal.