Patent ID: 7866922

Claim:
Equipment for constructing micropiles in soil, including: a hollow drilling rod ( 2 ) comprised of a number of elements ( 2 ) joined to each other, is fitted at the head with a bit ( 6 ), and is adapted, by rotating, to drive the rotation of said bit ( 6 ) wherein said bit presents at least one nozzle ( 7 ) adapted to direct a jet of fluid in front of the bit, and at least one nozzle ( 8 ) adapted to direct a jet of fluid in a direction substantially orthogonal to the axis of the drilling rod; pulling means ( 11 , 12 ) adapted to pull a protective tube ( 10 ), comprising of various sections ( 14 ) joined to each other, for the elements ( 2 ) of said drilling rod ( 2 ), while the rod advances, rotating, through the soil, said pulling means being configured so that said protective tube ( 10 ) does not interfere with the rotation of said drilling rod, wherein said pulling means consist of a sleeve ( 11 ), for the connection of said protective tube ( 10 ), which is fitted on the drilling rod ( 2 ) and is configured to allow free rotation of it, is fitted with coupling means ( 12 ) for said protective tube ( 10 ), and is fitted with stop means adapted to prevent said connector ( 11 ) from traversing along said drilling rod ( 2 ), while it advances through the soil.