Extraction device for the removal of pathway conduits from concrete slabs

Extraction device for the removal of pathway conduits from concrete slabs, provides a useful tool for the recovery of pathway conduits and freeing the hole for the subsequent laying of pipes for the conduction of electrical and telephone wiring and water pipes, characterized by a combination of an extraction device 10, some telescopic poles 80 and a crosshead 68, where the extraction device 10 is arranged by the combination of:

• a quadrangular plate 16, where its side faces comprise a curvature correlative to the diameter of a pathway conduit 11, and may rotate freely within the circular section;
• multiple holes towards the flat surface of the quadrangular plate 16, for fastening the elements that will be attached to the surface of the plate;
• a set of arms 18, having a spacing between each set, on the upper surface of the quadrangular plate 16, positioned at an inclination with respect to the horizontal axis and having threaded perforations;
• a stringer 32, forming a “U” placed between the spacing of each set of posts 26, which serves as a stop to the post set 26;
• a set of bars 34, which comprise reinforcement veins in its periphery to have greater resistance, placed between the separations of each set of posts 26, and present towards the lower part a perpendicular hole coincident with the perpendicular holes 28 of the posts 26, where a safety pin 38 will be located, and towards the upper end, it has a clamp-shaped fold 40
• Towards the rear of each of the bars 34, particularly towards the lower part, there is a hole 37, where a compression spring 19 will be inserted, and further down, there is a second hole 39, threaded where a screw will be inserted.
• Towards the central part of the quadrangular plate 16, it has a central hole 20 through which a square bolt 42 will be placed, of considerable height and which has a revision hole 44 which projects up to half of its length to join a threaded hole 46 through which a fastening screw will pass and through the lower part of the quadrangular plate 16, it attaches to a union nut 48, square in shape, with a cutout in one of its faces, threaded on the inside, as a means of fastening. Followed by union nut 48, it is joined to a square piece 50, which has a transversal locking ring and where this piece has a threaded hole in its lower part.
• Since the pathway conduits 11 are located in the concrete slabs and the height between them is considerable, the proposed device comprises some telescopic posts 80 which are joined by means of a male threaded coupling 84 on a female threaded coupling 82 placed at the ends of the telescopic posts 60, and can be joined by a plurality of pipe sections forming a telescopic unit, which is mounted towards the lower part of the square piece 50.
• Preferably, the rectangular plate 16, remains inside the cavity of the pathway conduit 11 and is fastened by means of the clamps 40 of each of the bars 34, which are inserted into the crosshead 14 of the pathway conduit. Once tightened, it is simply rotated to extract the pathway conduit 11, where said part has ridges that allow it to slide and rotate easily on the outer surface, and in this way, the piece will come out.
• On the other hand, the telescopic posts 80, which are joined as many as necessary, arranged by tubes which comprise at their ends some threaded couplings as connecting elements, whose upper end has a male threaded coupling 84 and at the opposite or lower end, a female threaded coupling 82 so that they can be attached to each other, also on its straight surface, has a series of holes placed at regular distances,
• a crosshead 68, for moving and rotating the extraction device 10, inside the pathway conduit 11, so that it can be extracted, consisting of an octagonal bolt 62, with a central hole through which a section of the telescopic tube 80 passes and coincides with a longitudinal hole through which a pin 64 is inserted, with a lock with an extraction ring 66, inside one of the holes of the telescopic tube 80, and of two arms 68 placed between the non-aligned axes and which articulate the turning motion.