EP2650466B1 - Spannbacke und Spannvorrichtung, die eine solche Spannbacke umfasst - Google Patents

Spannbacke und Spannvorrichtung, die eine solche Spannbacke umfasst Download PDF

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Publication number
EP2650466B1
EP2650466B1 EP13163716.7A EP13163716A EP2650466B1 EP 2650466 B1 EP2650466 B1 EP 2650466B1 EP 13163716 A EP13163716 A EP 13163716A EP 2650466 B1 EP2650466 B1 EP 2650466B1
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EP
European Patent Office
Prior art keywords
clamping
plates
stack
jaw
plate
Prior art date
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EP13163716.7A
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English (en)
French (fr)
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EP2650466A3 (de
EP2650466A2 (de
Inventor
Michel COUDRY
François PHILIPPE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soletanche Freyssinet SA
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Soletanche Freyssinet SA
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Publication of EP2650466A2 publication Critical patent/EP2650466A2/de
Publication of EP2650466A3 publication Critical patent/EP2650466A3/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe

Definitions

  • the present invention relates to the field of clamping jaws.
  • a clamping jaw according to the present invention is particularly adapted to be integrated in a device for clamping rods or drill pipes of a drilling machine, to allow the connection of successive rods or tubes prior to their introduction into the ground, or ensure their separation once drilling is complete.
  • a drilling machine comprising a clamping jaw of the aforementioned type is described below with reference to the figure 1 .
  • the drilling machine 100 comprises a frame 112 on which is mounted, generally in an articulated manner, a drillpole 114. On the frame 112 are mounted other equipment such as the control panel 116 of the drilling machine 100.
  • the drilling mast 114 serves as a guide rail for a drilling tool not shown in the figure and which is rotated and translated by a rotation head 118 via drill rods 120.
  • drill rods 120 constituting a drill string 122.
  • the connection between two successive drill rods 120 is then often made by screwing between a threaded end of one of the rods, and a threaded end complementary to the second.
  • a clamping device 126 (hereinafter lower clamping device), also known as “guillotine”, whose function will stand out better from the description which follows.
  • the clamping device 126 usually comprises a plurality of clamping jaws each having an engagement zone for contacting a drill pipe 120 and arranged relative to each other to take said rod 120 in a vice.
  • An example of a known clamping device is described in the patent application FR 2 549 892 .
  • US 6,931,965 B1 describes a tool according to the preamble of claim 1.
  • AU 531402 B2 discloses a key comprising rotating toothed disks. When a first drill pipe has been introduced into the ground, it is necessary that it is immobilized so that a second rod can be screwed onto its upper end. In the opposite case, the rotation of the second rod would cause the first rod to rotate simultaneously inside the borehole, preventing good screwing between the two rods.
  • the clamping device 126 ensures this immobilization of the first drill pipe.
  • the first rod being held firmly in position, the second rod can easily be screwed to it by rotating the rotation head 118.
  • This process is repeated as many times as necessary to achieve the desired drilling depth.
  • the operation of the machine 100 is slightly different during the extraction of the drill string 122.
  • the rotation head 118 is, initially, raised along the mast 114, taking with it the end rod of the drill string 122.
  • the penultimate rod still largely sunk into the ground, has its upper end facing the lower clamping device 126. It can, thus, be held in position.
  • the torque applied by the rotating head to the end rod of the drill string 122 is not sufficient to initiate its unscrewing relative to the penultimate rod.
  • the end rod is unscrewed from the rotating head, if the tightening torque at the head is less than that existing with the penultimate rod.
  • this preliminary unscrewing is provided by means of a second clamping device 124 (hereinafter upper device), located above the first device 126, and superimposed thereto. It is commonly called “double guillotine" the assembly formed by the two clamping devices 124, 126.
  • the end rod driven by the rotating head 118, can then be easily unscrewed, then removed completely and stored.
  • the rotation head 118 descends along the mast 114, cooperates with the threaded end of the drill pipe still held by clamping, raises the latter so as to recover the position described above and then repeats the same process until all the rods 120 of the drill string 122 are extracted.
  • clamping jaws currently used in clamping devices of the aforementioned type are not entirely satisfactory, both in terms of manufacturing costs, and difficulties in assembly and disassembly, especially during maintenance operations.
  • clamping jaws usually comprise plates, a main face of which has peaks or ridges made by machining and intended to penetrate into the steel of the drill rods for clamping. These plates, which form the engagement zone of the jaws, are fixed on supports.
  • the engagement zones have a generally flat shape, which does not marry the shape of the drill rods and thus limits the contact surface and the clamping efficiency.
  • the steel must therefore be chosen from less hard steels, which require, in order to achieve a sufficient hardness, that is to say greater than that of the rods, a complementary treatment.
  • This treatment generally consists of a hardening intended to harden the core material then a cementation, intended to harden it on the surface.
  • a hardening intended to harden the core material then a cementation, intended to harden it on the surface.
  • An object of the invention is to provide a clamping jaw to meet this need.
  • a clamping jaw for a drill pipe comprising an engagement zone intended to come into contact with the drill pipe to be clamped, the jaw being characterized in that it comprises a stack of distinct plates presenting , each, a slice comprising at least one toothed portion at which the plate is indented, and in that said toothed portions are arranged so as to reconstitute said engagement zone of the jaw.
  • the shape of the engagement zone of the jaw results from the profile chosen for the toothed portions of the plates of the stack.
  • the jaw according to the invention can be made easily and low cost, with an engagement zone perfectly adapted to the dimensions of the element to be clamped.
  • the clamping jaw according to the invention has, at its engagement zone, a generally concave shape. Therefore, the jaw forms a cavity adapted to receive at least a portion of the rod to be clamped.
  • Such a configuration makes it possible to increase the effective area of the jaw co-operating with the rod to be clamped, and thus to improve clamping.
  • each toothed portion has a generally curved profile, in particular in an arc.
  • each toothed portion has a general V-shaped profile.
  • each toothed portion comprises two substantially rectilinear branches, extending in two directions forming between them an angle greater than 0 ° and less than 180 °, for example included between 120 ° and 140 °.
  • each plate of the stack is provided with a fixing device comprising at least one fixing hole, each fixing hole being aligned with a fixing hole of each of the other plates of the same stack, so that forming a passage housing passing through the stack from one side to the other and adapted to receive a retaining pin.
  • the clamping jaw further comprises a support having a first and a second wall spaced from each other, in particular parallel to each other, the stack of plates being housed between said walls.
  • the first and second wall of the support may be spaced apart by spacers delimiting between the plates a housing adapted to receive the stack of plates.
  • the first and second walls each comprise at least one fixing hole aligned with a passage housing formed by the stack of plates, and a retaining pin introduced into said passage housing passes right through the assembly. formed by the two walls and the stack of plates.
  • the support can be, for example, mechanically welded.
  • two adjacent plates of the stack have their tooth portions offset with respect to each other.
  • the engagement zone of the jaw thus comprises a field of peaks for effective clamping.
  • the plates of the stack are identical, and two adjacent plates of the stack are arranged upside down.
  • This assembly is extremely simple to perform. If, in addition, the middle of the toothed portion is eccentric with respect to the middle of the plate, then it is possible to very easily obtain the aforementioned configuration in which two adjacent plates of the stack have their tooth portions staggered. one compared to the other.
  • the fixing device of each plate has a symmetry with respect to a median plane of the plate which is orthogonal to the main faces of the plate, whereby two adjacent plates of the stack, arranged back to back, have their aligned fasteners.
  • the edges of the teeth of a toothed portion are shifted inwardly of the plate relative to portions of the wafer located on either side of said toothed portion.
  • the material, in particular the steel, constituting the plates has a Vickers hardness of between 120 and 140.
  • the plates are made of untreated steel.
  • the support in the same way, may be untreated steel.
  • the present invention also relates to a clamping device for clamping a drill pipe, the device comprising at least two clamping jaws as described above, and a device for moving said clamping jaws between a remote position. and a clamping position.
  • each jaw comprises a support for the stack of plates, said support comprising a first and a second wall spaced from one another, the stack of plates is adapted to be housed between said walls, and the support is slidably mounted in a housing of the clamping device, whereby the jaw can be moved to and away from the rod to be clamped.
  • the two clamping jaws move along axisymmetric trajectories.
  • the displacement device comprises for example a hydraulic actuating cylinder for each clamping jaw.
  • the invention finally relates to a drilling machine, comprising a machine body, a guide mast, a rotation head mounted movably along said guide mast, and a clamping device as described above.
  • the two clamping jaws move along paths that are symmetrical with respect to the axis of rotation of the rotation head.
  • the drilling machine further comprises a second clamping device, connected in series with the first, so that the two clamping devices can clamp a single drill string.
  • the drilling machine further comprises means adapted to rotate one of the clamping devices around the axis of rotation of the rotation head.
  • the figure 2 is a partial view of a drilling machine 10 according to the present invention.
  • the parts of the drilling machine 10 that are not visible in the figure or are not detailed below are identical to those shown in FIG. figure 1 and described in connection with this figure.
  • the rotation head 18 mounted to move in translation along the mast 14 and in rotation about an axis A parallel to the direction of the mast 14 (axis A which also corresponds to the axis of the drill string 22 when it is in place, as shown in dotted lines in the figure) and, at the lower end of the mast 14, two clamping devices 24, 26, aligned along the axis A of the drill string 22 and surmounted by a guide member consisting of two U-shaped pieces 90a, 90b with their apertures directed towards each other to form a substantially circular passage for the drill string.
  • the upper device means the clamping device 24 closest to the rotation head 18, and by lower device, the clamping device 26 furthest from it.
  • the lower device 26 is fixed in rotation with respect to the axis A of the drill string 22.
  • the upper device 24 is itself rotatable about the same axis A. In a manner known per se and not described further, the relative pivoting of the upper device 24 is provided by means of a hydraulic cylinder 28.
  • the clamping device 26 illustrated on the figure 3 comprises a housing 30 of generally U-shaped, defining between its branches 34a, 34b an interior space 36 for the passage of the rods 20.
  • the two branches 34a, 34b of the housing 30 extend orthogonally to the axis A drill string 22, as illustrated on the figure 2 .
  • the interior space 36 is delimited by a bar 38 forming a guide rail, connecting the distal ends of the two branches 34a, 34b of the housing 30.
  • a second guide rail 40 is provided opposite said bar 38, parallel thereto, at the central portion 32 of the housing 30.
  • Two jaws 50a, 50b which will be described in more detail with reference to the figure 4 , are guided between the two guide rails 38, 40 above. Their displacement between a remote position and a clamping position is provided by hydraulic cylinders 42a, 42b. The rods (not shown) of the cylinders 42a, 42b are not sufficiently strong, the housing 30 and the guide rails 38, 40 take up most of the shear forces during tightening.
  • the supply of hydraulic cylinders 42a, 42b is thus regulated so that the trajectories of the two jaws 50a, 50b are systematically symmetrical with respect to the axis A of the drill string 22.
  • the drill rods pass vertically through the interior spaces 36 delimited by the branches 34a, 34b of the housings and the guide bars 38.
  • each clamping jaw can then be attached to or integral with guides (eg flat irons) slidably mounted within grooves formed in the housing of the clamping device.
  • guides eg flat irons
  • a clamping jaw 50 according to the invention is illustrated in more detail on the figure 4 .
  • It comprises a support 52 comprising two parallel walls 54, 56 and several spacers 58 connected to these walls 54, 56 by mechano-welds and delimiting with them a housing 59.
  • the ends of the walls 54, 56 are adapted to slide along the guide rails 38, 40 provided on the housing 30 of the clamping device. More precisely, the ends of the walls 54, 56 form, with the spacers 58, two U-shaped sliders adapted to slide respectively along the rails 38, 40.
  • the housing 59 of the support 52 is intended to receive several plates 60 (here eight) stacked on each other to form a stack of plates 62.
  • the stack 62 is shown partially exploded.
  • the plates 60 can be made of raw, untreated steel.
  • Each plate 60 comprises two main faces 64, 66 and a slice 68 defining four main sides, of which, in the example, a first and a second small side 71, 72 opposite one another, and a third and a fourth big sides 73, 74 also opposed.
  • the plate 60 has, in the example, a substantially rectangular general section.
  • the plate On one of its sides 74 (here a large side), the plate has a toothed portion 76 made for example by laser cutting, perpendicular to its two main faces 64, 66.
  • the toothed portions 76 are arranged in the vicinity of each other and are all substantially superposed in the height direction of the stack 62. In this way, they reconstitute a zone of engagement of the clamping jaw 50 intended come into contact with the object to be clamped, in particular a drill pipe, the edges 78 teeth forming a plurality of pins adapted to penetrate into said drill pipe to hold it or rotate it without slipping.
  • each plate 60 is slightly indented at its toothed portion 76.
  • the ridges 78 of the teeth are shifted inwardly of the plate 60 relative to the outer portions 69a, 69b of the portion 68. located on either side of the toothed portion 76.
  • the engagement zone of the jaw has a concavity directed towards the outside of the stack of plates 62, which allows it to optimize the contact surface with the object to be clamped especially when it has a tubular shape.
  • FIGS. 4 and 5 in particular show the concavity of each plate of the stack at its toothed portion (and thus of the jaw at its engagement zone), in section in a plane perpendicular to the stacking direction, in other words in a parallel plane at the main plane of the plate.
  • the toothed portion 76 divides into two substantially rectilinear branches 77a, 77b, extend in two directions forming between them an angle W.
  • the angle W is chosen as a function of the diameter D of the object to be tightened.
  • the angle W may be chosen between 120 ° and 140 °, for rods with a diameter of between 30 and 400 mm.
  • the toothed portion of a plate may have a curved profile and preferably substantially semicircular, so as to adapt best to the diameter of the drill pipe to be clamped.
  • the curve connecting the edges of the teeth of a plate has a radius of curvature substantially identical to the radius of the drill pipe.
  • the walls 54, 56 of the support 52 are slightly indented at the location provided for the toothed portions 76 of the plates 60, so that said toothed portions 76 project out of the support 52.
  • the longitudinal direction x of a plate 60 is understood to mean a direction perpendicular to the sides 71, 72 of the plate 60 which are located on either side of that 74 comprising the toothed portion 76.
  • transverse direction y is meant a direction perpendicular to the side 74 comprising the toothed portion 76.
  • the median plane P of the plate 60 a plane passing through the middle of the plate 60 taken in its longitudinal direction x, and perpendicular to this longitudinal direction x.
  • each plate 60 comprises a fixing device 80 in the form of one or more fixing holes 81, opening on its two main faces 64, 66.
  • fixing holes 81 are configured so that at least one hole 81 of each plate 60 is opposite a fixing hole 81 of each of the other plates 60 once they are stacked. At least one passage housing 82 passing through the stack 62 from one side to the other is thus formed.
  • all the plates 60 of the stack are identical. It is thus easier to superpose the fixing holes 81 of the different plates 60 by matching their different sides 71, 72, 73, 74.
  • the housing 59 formed by the support 52 has dimensions such that once the stack 62 of plates 60 disposed inside, the toothed portions 76 being oriented towards the outside the housing 59, the other three sides 71, 72, 73 of each plate 60 cooperate with internal walls of the housing 59.
  • the support 52 has as many fixing holes 84 opening on each of its two walls 54, 56, that the plates comprise fixing holes 81.
  • each passage housing 82 formed by fixing holes 81 of the plates 60 is found facing a hole 84 of each wall 54, 56 of support 52.
  • a retaining pin 86 introduced into each passage housing 82 passes right through the assembly formed by the two walls 54, 56 and the stack of plates 62.
  • 86 is a bolt. Once the bolt has passed through each of the plates of the stack and through the two walls 54, 56, it can cooperate with a nut (not shown) to maintain the assembly.
  • the fixing holes 81 of the same plate 60 are symmetrical with respect to the median plane P.
  • each fixing hole 81 is aligned with a hole in each other plate 60 of the stack 62, even when the plates 60 are arranged upside down, as is the case in the figure.
  • the outer portions 69a, 69b of the wafer 68 of a plate 60, located right through its toothed portion 76, are not of the same length.
  • the toothed portion 76 is not centered on the middle of the plate 60 taken in its longitudinal direction x.
  • each plate 60 As the toothed portion 76 of each plate 60 is slightly eccentric, two adjacent plates 60 of the stack 62, arranged back to back, have their toothed portions 76 offset with respect to each other.
  • the peaks 88 of the engagement zone are therefore staggered, as illustrated in FIG. figure 4 .
  • This configuration is particularly suitable for use in the lower clamping device 26.
  • the figure 5 illustrates another embodiment in which two adjacent plates 60 are arranged, not head to tail, but in the same direction. In this case, the teeth of the two plates 60 are aligned, forming a series of striations 90 parallel to each other. This configuration is particularly suitable for use in the upper clamping device 24.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)

Claims (17)

  1. Spannbacke (50) für ein Bohrgestänge, umfassend einen Eingriffsbereich, der dazu bestimmt ist, mit dem zu spannenden Bohrgestänge (20) in Kontakt zu treten, wobei die Backe (50) dadurch gekennzeichnet ist, dass sie einen Stapel (62) aus getrennten Platten (60) umfasst, die jeweils eine Scheibe (68) mit mindestens einem Zahnabschnitt (76) aufweisen, in dessen Bereich die Platte (60) eingerückt ist, und dass die Zahnabschnitte (76) so angeordnet sind, dass sie den Eingriffsbereich der Backe (50) wiederherstellen.
  2. Spannbacke (50) gemäß Anspruch 1, wobei jede Platte (60) des Stapels (62) mit einer Befestigungsvorrichtung (80) versehen ist, die mindestens ein Befestigungsloch (81) aufweist, wobei jedes Befestigungsloch (81) mit einem Befestigungsloch (81) jeder der anderen Platten (60) desselben Stapels (62) ausgerichtet ist, sodass eine Durchgangsaufnahme (82) gebildet wird, die den Stapel (62) von einer Seite zur anderen durchquert und dazu ausgelegt ist, einen Haltestift (86) aufzunehmen.
  3. Spannbacke (50) gemäß Anspruch 1 oder 2, ferner umfassend einen Träger (52), der eine erste und eine zweite Wand (54, 56) mit Abstand voneinander aufweist, wobei der Stapel von Platten (62) dazu ausgelegt ist, zwischen den Wänden (54, 56) aufgenommen zu werden.
  4. Spannbacke gemäß Anspruch 3, wobei die erste und die zweite Wand (54, 56) des Trägers jeweils mindestens ein Befestigungsloch (84), das mit einer durch den Stapel von Platten (62) gebildeten Durchgangsaufnahme ausgerichtet ist, und einen Haltestift (86) umfassen, der in die Durchgangsaufnahme durch die von den beiden Wänden (54, 56) und dem Stapel von Platten (62) gebildete Anordnung hindurch von Seite zu Seite eingeführt wird.
  5. Spannbacke (50) gemäß einem der Ansprüche 1 bis 4, wobei zwei benachbarte Platten (60) des Stapels (62) ihre Zahnabschnitte (76) versetzt zueinander angeordnet haben.
  6. Spannbacke (50) gemäß einem der Ansprüche 1 bis 5, wobei die Platten (60) des Stapels (62) identisch sind und zwei benachbarte Platten (60) des Stapels (62) entgegengesetzt angeordnet sind.
  7. Spannbacke (50) gemäß einem der Ansprüche 1 bis 6, wobei die Befestigungsvorrichtung (80) jeder Platte (60) eine Symmetrie in Bezug auf eine Mittelebene (P) der Platte (60) aufweist, die senkrecht zu den Hauptflächen (64, 66) der Platte (60) verläuft, wodurch die Befestigungsvorrichtungen (80) zweier benachbarter Platten des Stapels (62), die entgegensetzt angeordnet sind, ausgerichtet werden.
  8. Spannbacke (50) gemäß einem der Ansprüche 1 bis 7, wobei die Kanten (78) der Zähne eines Zahnabschnitts (76) in Bezug auf Abschnitte (69a, 69b) der Scheibe (68), die sich auf beiden Seiten des Zahnabschnitts (76) befindet, in Richtung des Inneren der Platte (60) verschoben sind.
  9. Spannbacke (50) gemäß einem der Ansprüche 1 bis 8, wobei die Platten (60) aus unbehandeltem Stahl hergestellt sind.
  10. Spannbacke (50) gemäß einem der Ansprüche 1 bis 9, wobei das Material, insbesondere der Stahl, aus dem die Platten bestehen, eine Vickers-Härte zwischen 120 und 140 aufweist.
  11. Spannvorrichtung (24, 26) zum Spannen eines Bohrgestänges (20), wobei die Vorrichtung mindestens zwei Spannbacken (50) gemäß einem der Ansprüche 1 bis 10 und eine Verschiebevorrichtung (42a, 42b) für die Spannbacken (50) zwischen einer Spreizposition und einer Spannposition aufweist.
  12. Spannvorrichtung (24, 26) gemäß Anspruch 11, bei der sich die beiden Spannbacken auf axialsymmetrischen Bahnen bewegen.
  13. Spannvorrichtung (24, 26) gemäß Anspruch 11 oder 12, wobei die Verschiebevorrichtung (42a, 42b) einen hydraulischen Betätigungszylinder für jede Spannbacke (50) umfasst.
  14. Bohrmaschine (10), umfassend einen Maschinenkörper (12), einen Führungsmast (14), einen Rotationskopf (18), der entlang des Führungsmastes (14) beweglich gelagert ist, und eine Spannvorrichtung (24, 26) gemäß einem der Ansprüche 11 bis 13.
  15. Bohrmaschine (10) nach Anspruch 14, bei der sich die beiden Spannbacken symmetrisch zur Rotationsachse (A) des Rotationskopfes (18) bewegen.
  16. Bohrmaschine (10) gemäß Anspruch 14 oder 15, ferner umfassend eine zweite Spannvorrichtung (24, 26), die in Reihe mit der ersten angeordnet ist, sodass die beiden Spannvorrichtungen (24, 26) ein und denselben Bohrstrang spannen können.
  17. Bohrmaschine (10) gemäß Anspruch 16, ferner umfassend Mittel (28), die dazu ausgelegt sind, eine der Spannvorrichtungen (24, 26) um die Rotationsachse (A) des Rotationskopfes (18) zu drehen.
EP13163716.7A 2012-04-13 2013-04-15 Spannbacke und Spannvorrichtung, die eine solche Spannbacke umfasst Active EP2650466B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1253418A FR2989413B1 (fr) 2012-04-13 2012-04-13 Mors de serrage et dispositif de serrage comprenant un tel mors

Publications (3)

Publication Number Publication Date
EP2650466A2 EP2650466A2 (de) 2013-10-16
EP2650466A3 EP2650466A3 (de) 2017-04-26
EP2650466B1 true EP2650466B1 (de) 2018-06-06

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EP13163716.7A Active EP2650466B1 (de) 2012-04-13 2013-04-15 Spannbacke und Spannvorrichtung, die eine solche Spannbacke umfasst

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EP (1) EP2650466B1 (de)
FR (1) FR2989413B1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR422032A (fr) * 1910-07-04 1911-03-10 Adolf Vietor Disposition de surface de prise pour outils de serrage
GB394068A (en) * 1932-02-20 1933-06-22 Voucher Ltd Improvements in vices
AU531402B2 (en) * 1979-11-08 1983-08-25 Irwin, L.F. Ratchet pipe wrench
FR2549892B1 (fr) 1983-07-28 1985-10-18 Brissonneau & Lotz Machine pour appliquer un couple de vissage ou de devissage a des tiges, en particulier des tiges de forage
US6931965B1 (en) * 2003-08-18 2005-08-23 Robert P. Fanguy Portable pipe tong and method of use
NO327993B1 (no) * 2006-06-09 2009-11-02 Aker Mh As Tangkonstruksjon

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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EP2650466A3 (de) 2017-04-26
FR2989413B1 (fr) 2014-12-19
EP2650466A2 (de) 2013-10-16
FR2989413A1 (fr) 2013-10-18

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