Patent ID: 7455480

Claim:
Method for the construction of drainage works to stabilize ground which is unstable and/or liable to landslides, for the drainage of percolates in contaminated areas, to increase the uptake capacity of groundwater to be conveyed to aqueducts, or as a drilling system for the injection of grout and other mixtures for the purpose of consolidation with the jet-grouting or conventional grouting technique, the method comprising the steps of: constructing a shaft in a position which the ground is stable; inserting an automated drilling unit ( 8 ) into the shaft; drilling and inserting one or more drainage pipes ( 5 ) into the area to be drained, starting from said shaft; pick-up of a drilling rod ( 12 ) from a magazine ( 11 ) by a robot ( 13 ), and positioning of said rod on a rotary head ( 14 ); drilling the concrete shaft wall by core boring; pick-up of a rod fitted with a disposable bit ( 6 ) and a preventer ( 20 ) from a magazine ( 11 ), and mounting thereof on said rotary head ( 14 ); rotating and simultaneous advancing of the head, with drilling of the soil and pressurised insertion of the preventer in the concrete wall of the shaft; pick-up of a second rod ( 12 ) from the magazine and loading of said rod onto the head ( 15 ) which, as it advances, screws said rod onto the rod already inserted in the ground and advances further, continuing to drill and inserting the second rod in the ground; repetition of the last stage until the required depth is reached; and returning the machine to the starting position for loading of a new set of rods into the magazine, and advance of the machine to the point at which the next drainage pipe is to be inserted.