MX2008008111A - Foundation pile driver - Google Patents

Abstract

A pile driver (20) for driving foundation piles (3), and having:a frame (23), in turn having a horizontal base (25), at least one upright (26) extending upwards from the base (25), and a movable body (28) which slides along the upright (26);a first lock device (30) fitted to the horizontal base (25) and which, in use, rigidly engages a connecting member (5) of a foundation structure (1);a second lock device (36) fitted to the movable body (28) and which, in use, rigidly engages a shaft (9) of a pile (3) to be driven;and at least one hydraulic jack (29) connected to the frame (23) and to the movable body (28) to move the movable body (28) along the upright (26) .

Description

FIRE PILOT MARTINET FIELD OF THE INVENTION The present invention relates to a foundation piling martinete.

BACKGROUND OF THE INVENTION As described in the patent application WO 2005 028759 Al, a foundation structure for building is known having at least one through hole and at least two connection cables extending through and fixed to the wall. structure, which is adjacent to the hole, and project upwards. When the foundation structure has been completed, a metal foundation pile is inserted through a hole that is subjected to a series of pushes or thrusts to drive it into the ground and, once driven, the top of the pile is axially fixed to the base. the foundation structure. A pile driver applies the thrusts, the pile driver is placed on top of the pile, cooperates with the upper end of the pile and is connected to the protruding part of the connection cables, which, when the pile is being driven, act as elements of the pile. piles pile driver reaction. Alternatively, instead of connection cables, each hole of the foundation structure can be covered with a metal guide tube, which is fixed to the foundation structure by means of at least one ring embedded in the foundation structure, the which has a top portion projecting upwards from the foundation structure and to which the pile driver is rigidly secured. As described in patent application WO 2005 028759 Al, the pile driver, placed on top of the pile to be driven, is connected to the projecting portion of the relative guide tube by means of at least two threaded connections in the upper part. and includes at least one hydraulic jack having a cylinder and a piston that can move axially with an adjustable force with respect to the cylinder. The cylinder is placed at the upper end of the pile and the piston is brought into contact with the lower surface of a reaction plate screwed integrally to the connections by means of the respective screws engaged in the upper portions of said connections. Once the pile driver has connected as mentioned above, the hydraulic jack of the pile driver is activated to generate a force of certain magnitude between the cylinder and the piston of the jack and, thus, subject the pile to a static attack, the same magnitude that the force mentioned, to drive the pile into the ground. The weight of the foundation structure provides the reaction force to the thrust or thrust applied by the pile driver, which is transmitted to the connections, which, together with the guide tube, act as reaction elements, maintaining the distance between them. the reaction plate and the foundation structure fixed as the piston exits the cylinder, thus pushing the cylinder down and with it, to the upper end of the pile. The pile shaft driven into the ground is normally divided into several segments, which are successively driven through the hole in the foundation structure, as described above, and welded together. A. Once the segment of the rod has been driven, the pile driver is disconnected from the upper end of the segment to insert another segment, which is butt welded to the driven segment; the pile driver it reconnects with the upper end of the next segment, thus continuing with the driving cycle. The pile driver described above has several disadvantages: its assembly takes a relatively long time; can not apply a large driving force (above 75 t) and must be removed before joining the segment of the rod with the next segment.

SUMMARY OF THE INVENTION An object of the present invention is to present a foundation pillar pile driver designed to eliminate the aforementioned disadvantages and which, at the same time, allows easy and economical start-up. In accordance with the present invention, there is provided a pile driver of foundation piles according to the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS A non-limiting embodiment of the present invention will be described, by way of example, which refers to the attached drawings, in which: Figure 1 shows a schematic section of a foundation pile that was embedded in the ground using the pile driver in accordance with the present invention. Figure 2 shows a schematic side view of a pile driver in accordance with the present invention. Figure 3 shows a front view of the pile driver of Figure 2. Figure 4 shows a plan view of the horizontal support base of the pile driver of Figure 2. Figure 5 shows a schematic section of a first immobilizer device of the pile driver of figure 2. Figure 6 shows a schematic section of a second immobilizer device of the pile driver of figure 2. Figure 7 shows a schematic and perspective view of a variant of the pile driver of pile piles of Figure 2, view in which for the sake of clarity, some parts have been removed. Figure 8 shows a schematic plan view of the pile driver of figure 7, view in which for the sake of clarity, some parts have been removed.

Figure 9 shows a perspective view of a variant of an immobilizing device of the pile driver of Figure 2. Figure 10 shows a partially sectioned perspective view of the immobilizing device of Figure 9.

DETAILED DESCRIPTION OF THE INVENTION The number 1 of figure 1 designates the foundation structure of a building (not shown) of terrain 2. The foundation structure 1 is, generally, underground and, by means of several piles 3 ( in figure 1 only one of them is shown), it transfers to the terrain 2 the loads applied on it. Each pile 3 extends downwards through the foundation structure 1 and is driven into the ground 2. For this purpose, the foundation structure 1 has, for each pile 3, a cylindrical hole 4 whose axis is vertical and which is coated with a metallic guide tube 5, which is fixed to the foundation structure 1 by means of at least one ring 6 embedded in the foundation structure 1, ring having an upper portion 7 projecting upwards from the structure of foundation 1. Between the foundation structure 1 and the ground 2 has been interposed a layer 8 of relatively thin cement which is known as "thin" cement. Each pile 3 is a metallic pile constituted by a shank 9 defined by several tubular segments butt-welded together or connected by means of a cold-fit connection lug and at least one lower leg 10 that defines the lower end of the pile 3. All the rods 9 are tubular, have an internal through-passage 11 and their cross-sectional diameter is smaller than that of the hole 4 so that they can be fitted with relative ease in the through-hole 4. Each head 10 is defined by a circular plate flat 12, whose outer edge 13 is smooth or irregular and having a diameter greater than that of the hole 4, the plate is initially separated from the shank 9 and is placed in the thin cement layer 8 (or directly on the ground 2 when the thin cement layer 8 is not available), below the foundation structure 1 and coaxially with the hole 4 when the foundation structure 1 is constructed. The shank 9 engages with the leg 10 to form the pile 3 when the shank 9 is inserted through the hole 4.

To ensure that between each shank 9 and leg 10 there is a firm mechanical connection, the leg 10 has a connecting member 14, which engages with the shank 9 to fix the shank 9 transversely to the leg 10. Each member connection 14 is usually defined by a cylindrical tubular member projecting axially from the plate 12 and having the dimensions suitable for coupling with the lower portion of the internal conduit 11 of the shank 9 leaving a relatively small clearance. In the lower end portion of each guide tube 5 at least one sealing ring 15 made of elastic material has been placed., which engages with the external cylindrical surface of the shank 9 of the pile 3 when the pile 3 is inserted into the through hole 4. When the foundation structure 1 is constructed, adjacent to each hole 4 at least one duct is formed. injection 16, which is defined by a metal tube 17 that extends through the foundation structure 1 and has an upper end 18 projecting from the structure 1 and a lower end 19 adjacent to the hole 4 and which is in contact with the surface 52-5S0 of the plate 12 of the relative leg 10. To drive each pile 3 into the ground 2, the rod 9 is first inserted into the hole 4 so that it engages with the leg 10 (as described above), which it is placed under the foundation structure 1, in the ground 2, and is coaxial to the hole 4. Once the shank 9 has been coupled with the leg 10 to form the pile 3, a pile driver is placed on top of this. 20 which is secured to the guide tube 5 to apply a driving thrust, that is, a vertical push down, on the pile 3. The thrust reaction force applied by the pile driver 20 is supplied by the weight of the structure. foundation 1 and is transmitted by the guide tube 5, which acts as a reaction element. Alternatively, the pile driver 20 can be secured to the guide tube 5 before the rod 9 is inserted into the guide tube 5. As each pile 3 is driven into the ground 2, the leg 10 forms a tubular channel in the ground 2. 21 delimited externally by the ground 2 and internally by the shank 9 and as the pile 3 is driven into the ground 2, along the injection duct 16, simultaneously, it is injected under pressure 52-520 in the tubular channel 21 a cementitious material 22 which is practically in the plastic state. The sealing ring 15 prevents the cementitious material 22 injected under pressure from escaping upwards through the space between the outer surface of the shank 9 and the inner surface of the guide tube 5. Once the pile 3 has been driven, the duct inner 11 of pile 3 will be filled with the cementitious material in the plastic state (not shown), "concrete" in particular, and once the internal conduit 11 of pile 3 has been filled, pile 3 is axially fixed to the foundation structure 1 securing (usually by means of welding) to the projecting portion 7 of the guide tube 5 a metal plate (not shown) placed on top of the upper end of the pile 3 and coupled thereto. As shown in Figures 2, 3 and 4, the pile driver 20 includes: a gantry type frame 23 having a vertical axis of symmetry 24 and including a horizontal base 25; two columns 26 extending upwards from the base 25, and a horizontal upper member 27 joining the two columns 26. Between the two columns 26 there is a movable horizontal body 28 which, by means of two hydraulic jacks 29, slides along the axis 52-520 vertical symmetry 24. Each hydraulic jack 29 has a cylinder rigidly connected to the movable body 28 and a fixed piston at the upper end to the lower surface of the upper member 27 of the frame 23. The horizontal base 25 has an immobilizing device 30, which, during use, is rigidly coupled with the guide tube 5 of the foundation structure 1. As shown in Figure 5, the immobilizing device 30 includes: a through hole 31 formed in the horizontal base 25, which is coaxial to the vertical axis of symmetry 24 and that tapers, that is to say, that its diameter is reduced, downwards; several wedges 32 (normally three or more), each of which has the form of a sector and, during use, is inserted into the hole 31; and an actuator device 33 for raising the base 25 with respect to the foundation structure 1 that is below it. In a possible embodiment, the hole 31 is circular and each wedge 32 is sector-shaped. In a different embodiment, the hole 31 is polygonal and each wedge 32 has a polygonal sector shape; the polygonal shape of the hole 31 (and, therefore, of the wedges 32) also allows transmitting the torque of 52-520 twisting the guide tube 5 about the vertical axis 24. In a possible embodiment, two adjacent wedges 32 will essentially be in contact side by side with each other (ie, the wedges 32 cover almost the entire perimeter of the hole 31), while in a different modality, two adjacent wedges 32 will be separated by a space of size comparable to that of a wedge 32 (ie, the wedges 32 will cover approximately half of the perimeter of the hole 31). As shown in Figures 3 and 4, the actuator device 33 includes two hydraulic jacks 34 supported on the base 25, on opposite sides of the hole 31. In each column 26 a seat 35 is formed which is closed by a gate and which houses at least one hydraulic jack 34. As shown in Figure 6, the moving body 28 is provided with an immobilizing device 36 which, during use, rigidly engages with the shank 9 of the pile 3 to be driven. The immobilizing device 36 includes: a through hole 37, formed in the movable body 28, which is coaxial to the vertical axis of symmetry 24 and which tapers, ie, its diameter is reduced, upwards; several wedges 38 (normally three or 52-520 more), each of them has a sector shape and is inserted in the hole 37; an annular support plate 39 located below the movable body 28 and support wedges 38, and an actuator device 40 for moving the support plate 39 towards the movable body 28. In a possible embodiment, the orifice 37 is circular and each wedge 38 It has a sector shape. In a different embodiment, the hole 37 is polygonal and each wedge 38 has a polygonal sector shape; the polygonal shape of the hole 37 (and, therefore, of the wedges 38) also allows the torque to be transmitted to the shank 9 about the vertical axis 24. In a possible embodiment, two adjacent wedges 38 will be essentially in contact with each other. side (ie, the wedges 38 will cover almost the entire perimeter of the hole 37), while, in a different embodiment, two adjacent wedges 38 will be separated by a space of size comparable to that of a wedge 38 (i.e. wedges 38 will cover approximately half the perimeter of the hole 37). The actuator device 40 includes several hydraulic jacks 41 equidistantly spaced around the hole 37 and each has a 52-520 cylinder integrated to the movable body 28 and a piston having an end portion integral with the support plate 39. The piston of each hydraulic jack 41 slides within a through hole formed in the movable body 28; the cylinder of each hydraulic jack extends upwardly from an upper annular surface of the movable body 28 and the movable body 28 includes an annular housing housing 42 which houses the cylinders of the hydraulic jacks 41. A centering member 43 is connected, preferably rigidly, with the columns 26 of the frame 23, above the upper limit position of the movable body 28 and has a central hole 44 which is coaxial to the vertical axis of symmetry 24 and which tapers, ie, its diameter is it is reducing, down. The centering member 43 allows the centering of the shank 9 to align the shank 9 with the vertical axis of symmetry 24 and, therefore, with the hole 31 of the locking device 30 and with the hole 37 of the immobilizing device 36. In one additional mode, shown with a dashed line, below the movable body 28 is located an additional movable body 45, mounted so that it slides freely along the columns 26 and which supports an immobilizing device 46. The 52-520 immobilizer device 46 includes: a through hole 47, formed in the movable body 45, which is coaxial to the vertical axis of symmetry 24 and which tapers, ie, its diameter is reduced, downward; and several wedges (not shown), each of which has the form of a sector and, during use, are inserted in the hole 44. The operation of the pile driver 20 will then be described, with reference to the driving of pile 3 of Figure 1 in the ground 2. First, the pile driver 20 is installed using a crane, which hoists the pile driver 20 and places it on top of a foundation structure 1, above the hole 4, with the base 25 resting on the foundation structure 1 and the upper end 7 of the guide tube 5 inserted in the hole 31 of the immobilizing device 30. At this point, the wedges 32 are inserted in the hole 31, around the upper end 7 of the guide tube 5, and the hydraulic jacks 34 of the actuator device 33 were put to work to raise slightly (a few centimeters) to the base 25 and separate it from the foundation structure 1. The elevation of the base 25 with respect to the foundation structure 1 52-520 and, therefore, also with respect to the upper end 7 of the guide tube 5, compresses the wedges 32 between the inner surface of the hole 31 and the external surface of the guide tube 5 to obtain a firm mechanical connection between the base 25 and the upper end 7 of the guide tube 5, i.e., to immobilize the base 25 in the cane 9. Once the base 25 is secured to the guide tube 5, the first segment of the shaft 9 is inserted in the hole 37 of the immobilizer device 36 of the moving body 28 and, therefore, both, through the guide tube 5. As mentioned, the centering member 43 helps to align the shank 9 with respect to the vertical axis of symmetry 24 and, therefore, with respect to the hole 37 of the immobilizing device 36. A Once the first segment of the shank 9 of the pile 3 has been placed inside the hole 4, has passed through the guide tube 5 and has been coupled with the leg 10 that is below, the pile 3 is ready to be driven into the ground 2. It is at this point that the hydraulic jacks 41 of the actuator device 40 of the immobilizer device 36 are operated to pull the support plate 39 and, therefore, the wedges 38 of the support plate 39, 52-520 towards the moving body 28 and towards the hole 37, so that the wedges 38 are compressed between the inner surface of the hole 37 and the external surface of the shank 9 to obtain a firm mechanical connection between the moving body 28 and the shank 9, that is, to immobilize the mobile body 28 in the cane 9. Once the immobilizing device 36 is secured in the shaft 9, the hydraulic jacks 29 start to operate downwardly to the mobile body 28. The downward movement of the body mobile 28 produces a corresponding downward movement of the shank 9, by virtue of which the frame 23 is secured to the foundation structure 1 by the immobilizing device 30 of the base 25 which is secured around the upper end 7 of the guide tube 5. When the hydraulic jacks 29 are stopped, that is to say, when the mobile body 28 reaches its lower limit position, the immobilizing device 36 is separated from the shank 9 by the inlet. a in operation of the hydraulic jacks 41 of the actuator device 40 for separating the support plate 39 and, therefore, the wedges 38 of the support plate 39, from the movable body 28. It is in this 52-520 As the hydraulic jacks 29 are turned off to return the moving body 28 to its upper limit position, the locking device 36 is once again secured around the shank 9 and the hydraulic jacks 29 come back into operation to push the moving body 28 towards down along with the shank 9. Once a segment of the shank 9 has been driven, another segment of the shank 9 is inserted into the pile driver 20, so that the end of the second segment is in contact with the end the first and the two ends are welded to the top. It is important to note that the insertion of another segment of shank 9 does not even involve partial dismantling or removal of the pile driver 20. In an alternative embodiment, two successive segments of the shank 9 can be joined using a joint lug (not shown) , which is partially coupled and cold fit inside the internal conduits of the two segments, the lug can be used instead of or in addition to butt welding. In which case, the movable body 45 and the relative immobilizing device 46 can be used to stabilize the lower segment of the shank 9 when the connecting lug is cold-fitted. 52-520 In other words, the immobilizing device 46 of the movable body 45 is secured around the lower segment of the shank 9 and the movable body 45 is supported on the horizontal base 25 that is below, thus immobilizing the lower segment of the shank 9 to fit in cold to the joint lug. Once the foundation pile 3 has been driven into the ground 2, the pile driver 20 is disconnected from the upper end 7 of the guide tube 5 releasing the immobilizing device 30 and can be repositioned to drive another foundation pile 3. The immobilizing device 30 is released by actuating the hydraulic jacks 34 of the actuator device 33 to lower the base 25 back onto the foundation structure 1, it is at this point that the wedges 32 can be easily removed. In the embodiment of Figures 7 and 8, the pile driver 20 includes: at least two mobile bodies 28a and 28b vertically displaced from each other; at least two locking devices 36a and 36b, each of which is attached to the respective moving body 28a or 28b, which, during use, are rigidly coupled with the shank 9 of the pile 3 to be driven; and at least two hydraulic jacks 29a 52-520 and 29b, each of which is connected to the frame 23 and to the respective movable body 28a or 28b to move the mobile body 28a or 28b along the columns 26. It is preferably counted with two pairs of jacks 29a and 29b, the hydraulic jacks 29a and 29b of each pair are connected to the frame 23 and to the respective movable body 28a or 28b to move the movable body 28a or 28b along the columns 26. During use, the two movable bodies 28a and 28b can be used to simultaneously apply pushes or thrusts to the shank 9 of the pile 3 to be driven in and, thus, to apply a considerable driving force (i.e., by combining the thrusts of the hydraulic jacks 29a and 29b) or can be used to apply, alternately, an onslaught to the shank 9 of the pile 3 to be driven in and, thus, provide a smaller and essentially uninterrupted driving force (i.e. alternately the thrust of hydraulic jacks 29a and 29b). When it is necessary to apply a considerable thrust force, for example, to penetrate a particularly hard ground layer 2, it is possible to use the two moving bodies 28a and 28b to apply, Simultaneously, they attack the reed 9 of pile 3 that is going to sink. In other situations, the two movable bodies 28a and 28b can be used to apply alternately to the shank 9 of the pile 3 to be driven, so that when a pair of hydraulic jacks 29a or 29b is applying an onslaught, the another pair of hydraulic jacks 29a or 29b is returning to its initial position and vice versa, thus providing a lower but essentially uninterrupted drive force. In the embodiment of FIGS. 9 and 10, the immobilizer device 36 is mounted on the movable body 28 so that it rotates with respect to the movable body 28 about the vertical axis 24. More specifically, the immobilizer device 36 is mounted on the bearings 48 placed in the mobile body 28. Additionally, the mobile body 28 carries a pair of gearmotors 49 (electric or hydraulic) which transmit to the immobilizing device 36 a movement about the vertical axis 24. To this end, the immobilizing device 36 has an annular gear 50. , which engages with two pinions 51 that the respective gearmotors 49 rotate, so that the immobilizer device 36 rotates the shaft 9 of the pile 3 as the pile 3 is being kneeling By way of example, during use (ie, when the pile 3 is being driven), the immobilizing device 36 rotates about the vertical axis 24 at a speed ranging between 20 and 30 rpm. The pile driver 20 just described has numerous advantages: it can be assembled quickly, it allows a considerable impulse force (greater than 300 t) to be applied and does not have to be removed to join the driven segment of the pillar rod 9 3 with the next segment of the rod 9. A pile driver 20 as described is also easy and inexpensive to manufacture and receive maintenance. It is important to note that the hydraulic jacks 34 of the immobilizer device 30 and 41 of the immobilizer device 36 are well protected against dust and impacts and, thus, require less maintenance and repairs. The pile driver 20 as described above is preferably used to drive foundation piles 3 of the type shown in FIG. 1, although it can also be used advantageously to drive other types of foundation piles that differ from pile 3 of FIG. 1 , in regards to the way in which the pile is secured to the foundation structure. In which case, the immobilizing device 30 must be modified to adapt accordingly. 52-520

Claims (17)

1. CLAIMS: 1. A pile driver (20) for driving foundation piles (3), which includes: a frame (23), which in turn, includes a horizontal base (25); at least one column (26) extending upwardly from the base (25), and a first mobile body (28) that slides along the column (26); a first immobilizing device (30) placed in the base (25) and which, during use, rigidly couples with the connecting member (5) of an underlying foundation structure (1); a second immobilizing device (36) placed in the first mobile body (28), which, during use, is rigidly coupled with a shank (9) of a pile (3) to be driven; and at least one first hydraulic jack (29) connected with the frame (23) and with the first moving body (28) for moving the first mobile body (28) along the column (26); the pile driver (20) is characterized in that the first immobilizing device (30) includes a first through hole (31) formed in the base (25) and tapering downwards; several first wedges (32), each of which has the form of 52-520 sector and, during use, are inserted into the first hole (31); and a first actuator device (33) for raising the base (25) with respect to the underlying foundation structure (1). A pile driver (20) according to claim 1, wherein the first actuator device (33) includes at least two second hydraulic jacks (34) supported on the base (25) and located around the first hole (31). 3. A pile driver according to claim 2, wherein the frame (23) includes two columns (26) located on opposite sides of the first hole (31); and a seat (35), which houses a respective second hydraulic jack (34), formed in each column (26) and closed by a gate. A pile driver (20) according to claims 1, 2 or 3, wherein the second immobilizing device (36) includes: a second through hole (37) formed through the first moving body (28) and tapering towards above; several second wedges (38), each of which has the form of a sector and inserted into the second hole (37); an annular support plate (39) located under the first moving body (28) and supporting the second wedges (38); and a second actuator device (40) for moving the support plate (39) towards the first movable body (28). A pile driver (20) according to claim 4, wherein the second actuator device (40) includes several third hydraulic jacks (41) equidistantly spaced around the second hole (37) and each of which includes a cylinder integral with the first mobile body (28) and a piston having an end portion integral with the support plate (39). A pile driver (20) according to claim 5, wherein the cylinder of each of the third hydraulic jacks (41) extends upwardly from an upper annular surface of the first moving body (28). A pile driver (20) according to claim 5, wherein the first mobile body (28) includes an annular housing (42) housing the cylinders of the third hydraulic jacks (41). 8. A pile driver (20) according to any of claims 1 to 7 and includes a centering member (43) that is rigidly connected to the column (26) of the frame (23), above the upper limit position of the first moving body (28) and includes a third central hole (44) that tapers down . A pile driver (20) according to any one of claims 1 to 8 and including a second movable body (45) located below the first movable body (28) and supporting a third immobilizing device (46). A pile driver (20) according to claim 9, wherein the third immobilizing device (46) includes: a fourth through hole (47) formed through the second movable body (45) and tapering down; and several third wedges (48), each of which is sector-shaped and, during use, inserted into the fourth orifice (47). A pile driver (20) according to claim 9 or 10, wherein the second movable body (45) is mounted so as to slide freely along the column (26). 12. A pile driver (20) according to any of claims 1 to 11, wherein the second locking device (36) is mounted on the first moving body (28) to rotate with respect to the first moving body (28) about a vertical axis (24). A pile driver (20) according to claim 12, wherein the first mobile body (28) supports at least one gearmotor (49), which transmits to the second immobilizer device (36) the movement to rotate the second immobilizer device (36) about the vertical axis (24); the second immobilizer device (36) has a ring gear (50) which meshes with a pinion (51) that the gearmotor (49) rotates. A pile driver (20) according to any of claims 1 to 13 and including: at least two first movable bodies (28a and 28b) that are vertically offset from each other; at least two second locking devices (36a and 36b), each of which is connected to the respective first moving body (28a or 28b) and which, during use, is rigidly coupled with the shank (9) of the pile (3). ) that is going to sink; Y 52-520 at least two first hydraulic jacks (29a and 29b), each of which is connected to the frame (23) and to the first respective moving body (28a or 28b) to move the first mobile body (28a or 28b) along the column (26); where the first two movable bodies (28a and 28b) and the first two hydraulic jacks (29a and 29b) can be used to apply thrusts simultaneously to the shaft (9) of the pile (3) to be driven, so that provides a considerable impulse force; or the first two movable bodies (28a and 28b) and the first two hydraulic jacks (29a and 29b) can be used to alternately attack the shaft (9) of the pile (3) to be driven, so that provides a smaller and essentially uninterrupted impulse force. A pile driver (20) according to claim 14 and including two pairs of hydraulic first jacks (29a and 29b); the hydraulic jacks (29a and 29b) of each pair are connected to the frame (23) and to the first respective moving body (28a or 28b) to move the first mobile body (28a or 28b) along the column (26). 16. A pile driver (20) for driving piles 52-5S0 (3) of foundation, which includes: a frame (23), which in turn, includes a horizontal base (25), at least one column (26) extending upwardly from the base (25), and minus two first mobile bodies (28a and 28b) vertically displaced from each other; a first immobilizing device (30) placed in the base (25) and which, during use, rigidly couples with the connecting member (5) of an underlying foundation structure (1); at least two second locking devices (36a and 36b), each of which is connected to the respective first moving body (28a or 28b) and which, during use, are rigidly coupled with the shank (9) of the pile (3). ) that is going to sink; and at least two first hydraulic jacks (29a and 29b), each of which is connected to the frame (23) and to the respective first moving body (28a or 28b) to move the first moving body (28a or 28a). 28b) along the column (26); where the first two moving bodies (28a and 28b) and the first two hydraulic jacks (29a and 29b) can be used to apply thrusts simultaneously to the rod (9) of the pile (3) that 52-520 it is going to sink, so that they supply a considerable force of impulse; or the first two movable bodies (29a and 29b) can be used to alternately attack the shaft (9) of the pile (3) to be driven, so as to provide a lower and essentially uninterrupted impulse force. A pile driver (20) according to claim 16 and including two pairs of hydraulic first jacks (29a and 29b); the hydraulic jacks (29a and 29b) of each pair are connected to the frame (23) and to the respective first moving body (28a or 28b) to move to the first mobile body (28a or 28b) along the column (26). 52-520