drilling tool for the construction of large diameter piles in rock, ventilation shafts and other similar works.

摘要

a tool (1) is described for rock excavation for the construction of large diameter drilled piles, ventilation shafts, and other works of excavation, similarcapable of being mounted in such a way svincolabile on the lower end of a battery of rods (20) of a drilling rig (30).the tool (1) comprises a container (2) to form substantially cylindrical or slightly conical trunk with inferiormente of a plurality of cutting tools or cutters (10) capable of frantumare rock.the tool (1) are also provided for: - means of support (3) acts to retain a svincolabile a plurality of modular elements (14) which combine to form a ballast (13); and - mezzi collection (9) placed in close proximity to the cutting tool (10).acts to move inside the container (2), the fragments of rock through special openings (9) at the bottom of the container (2).