EP0060498A2 - Apparatus for connecting two abutting reinforcing bar ends by a sleeve - Google Patents

Abstract

A device for securing a sleeve on the abutting ends of two axially aligned reinforcing bars includes an upper device part, a lower device part aligned below the upper device part and a drawing die mounted on the lower device part. Cylinder-piston units interconnect the upper and lower device parts for moving the drawing die over the sleeve and coupling the reinforcing bars together. The cylinder-piston units are disposed in parallel relation to one another and to the axis of the drawing die. At least one cylinder-piston unit provides the drawing force and another provides a counteracting force. The cylinder-piston units are both located on the same side of the drawing device axis and are spaced at different distances from the drawing die axis.

Description

The invention relates to a device for connecting two butt-jointed reinforcement bars, preferably provided with surface profiles, by means of a sleeve, which causes a relative movement caused by a cylinder-piston unit which is arranged on an upper machine part parallel to the axis of the reinforcement bars and is supported relative to the sleeve a drawing nozzle arranged on a lower machine part is pressed onto the ends of the reinforcing bars by means of this drawing nozzle.

• Bewehrungsstäbe, nämlich Betonrippenstähle, besitzen Oberflächenprofilierungen in Form von Rippen, um den Verbund mit dem Beton, in den sie eingebettet sind, zu verbessern. Diese Oberflächenprofilierungen verbessern selbstverständlich auc_hden Scherverbund zwischen den Bewehrungsstäben und der Muffe, wenn sichergestellt ist, daß das Material der Muffe die Oberflächenprofilierungen der Bewehrungsstäbe satt umgibt. Mit den bekannten Vorrichtungen, mit denen der Verformungsdruck auf die Muffe immer nur in einer radialen Ebene aufgebracht wird, läßt sich dies aber nicht immer erreichen. Aus Gründen der Herstellung befinden sich bei warmgewalzten Bewehrungsstäben die Profilierungen auf zwei einander gegenüberliegenden Seiten. Insbesondere dann, wenn ein Stab schon einbetoniert ist, bevor der andere Stab angeschlossen werden soll, ist es nicht möglich, die Richtung der Druckanwendung beim Verformen der Muffe so auszurichten, daß die in unterschiedlichen Ebenen liegenden Rippen beider Stäbe einwandfrei erfaßt werden. Um dies zu erreichen, ist es zwar bekannt, eine Muffe in jedem Querschnitt in mehreren unterschiedlichen radialen Richtungen zu verformen; damit wird aber die doppelte Anzahl von Arbeitsvorgängen erforderlich.

So-called press joint joints are known to butt butt ends at the ends. In this case, a sleeve is pushed over the ends of the bars to be connected, which is deformed by the application of external forces acting radially to the axis of the reinforcing bars so that their inner surface comes into direct contact with the outer surface of the reinforcing bars. The sleeve is deformed either by rolling between corresponding rollers or by applying radial pressure using appropriate tools in one operation over the entire length of the sleeve or in several operations step by step over its length:

• Reinforcing bars, namely reinforcing ribs, have surface profiles in the form of ribs in order to improve the bond with the concrete in which they are embedded. Improve this surface profilings of course AUC _h the shear bond between the reinforcing bars and the sleeve, it is ensured that the material of the sleeve surrounding the surface profiles of the reinforcing bars fed. With the known devices with which the deformation pressure is always applied to the sleeve only in a radial plane, this cannot always be achieved. For production reasons, the profiles are located on two opposite sides of hot-rolled reinforcing bars. In particular, if a rod is already concreted before the other rod is to be connected, it is not possible to align the direction of the pressure application when deforming the sleeve so that the ribs of the two rods lying in different planes are correctly grasped. In order to achieve this, it is known to deform a sleeve in each cross section in several different radial directions; however, this requires twice the number of operations.

Finally, it is also known to deform a sleeve by pressing it through a drawing die, in which, similarly to the drawing of wires, it undergoes a reduction in diameter. In this case, a radial deformation pressure is applied to the sleeve on all sides, which due to this pressure on all sides also abuts the entire surface of the reinforcing bars.

Now it is necessary in construction to be able to make these connections of reinforcing bars not only at all, but above all on the construction site itself. For example, it is often necessary to connect reinforcement bars to the reinforcing bars that have already been concreted in from the concrete. A device for producing such press joints must not only be portable, but also be designed so that press joints can also be made when several reinforcing bars are arranged next to each other in the structurally required or prescribed minimum distances from each other.

A known device of the type mentioned above consists of two symmetrical parts which are attached to both sides of a reinforcing bar and which can be connected to one another in a tensile manner against radial pressure (DE-OS 24 37 199 and 27 15 190). On each of these device parts there are two hydraulic cylinder-piston units, by means of which, with the support of the upper machine part relative to the sleeve, the lower machine part is pulled over the sleeve with a drawing nozzle and this is brought to flow. In addition to the fact that this device is difficult and cumbersome to handle, due to its two-part design, it requires a lot of space on all sides outside the reinforcing bars to be connected, so that they cannot be arranged at the required minimum distances from one another.

The invention has for its object to provide a device of this type which is easy to handle and which allows such press joints to be carried out even when the reinforcing bars to be connected are arranged at close distances from each other.

According to the invention, this object is achieved in a device of the type specified above in that the cylinder-piston unit or cylinder-piston units causing the relative movement is arranged or arranged as a pull cylinder on one side eccentrically to the drawing nozzle and that the side of the cylinder-piston unit or the cylinder-piston units opposite the drawing nozzle, at least one further cylinder-piston unit is arranged as a counter-rotating cylinder, which can be acted upon with pressure medium in the opposite direction.

Two cylinder-piston units are expediently provided as the pull cylinder, which are arranged symmetrically on both sides of the plane of action of the resultant of the acting forces. The piston surfaces of the pull cylinder and counter-cylinder are advantageously inversely related to their distances from the axis of the drawing nozzle.

The upper machine housing can be provided with a fork-shaped bracket for support against the sleeve. A support sleeve, which can be connected to this in a force-fitting and form-fitting manner, is expediently provided on the console, which can consist of two shell-shaped parts surrounding the reinforcement bar, each of which has a flange-like widening at the upper end. The two parts of the support sleeve with the flange-like widenings can be pivotally connected to the console about axes running parallel to the axis of the drawing nozzle, wherein springs can be provided to hold the two parts of the support sleeve in the closed position.

The lower machine part expediently has a base plate which is connected to the pull cylinder or to the pull cylinders and to the counter-rotating cylinder and on which the drawing nozzle is arranged on the end face.

The base plate is expediently fork-shaped with a longitudinal slot, at the inner end of which the drawing nozzle is arranged. The drawing nozzle itself can be inserted into a recess in the base plate that widens the longitudinal slot. It expediently consists of at least two ring-shaped parts which complement one another to form a closed ring cross-section, preferably of two parts of different arc length, of which the shorter, inner part is fixed but detachable, e.g. by screws, connected to the base plate and the longer outer part can be inserted loosely into the recess in the base plate. The outer part expediently has a shoulder on the underside with which it is supported against corresponding abutments at the front ends of the base plate.

The drawing nozzle can also be formed on a two-part holding claw, the parts of which have recesses which correspond to one another and complement one another to form an overall cross section at one end to form the drawing nozzle intended for the deformation of the sleeve and are held at the other end in the lower machine part.

The outer surfaces of the parts of the holding claw are expediently tapered over part of their length and lie against correspondingly designed contact surfaces of the receptacle formed in the base plate.

The holding claw can be fixed in the working position in relation to the base plate. To fix the holding claw, a threaded bolt acting in the direction of insertion can be provided, which interacts with a corresponding hole in the holding claw.

The holding claw itself expediently has one through school formed stop to limit the depth of insertion relative to the base plate.

The recesses in the two parts of the holding claw to form the drawing nozzle can be lined with inserts made of wear-resistant material, which are expediently interchangeable.

The piston rod of the pull cylinder or the piston rods of the pull cylinder and the piston rod of the counter cylinder are expediently firmly connected to the base plate, e.g. screwed.

The pressure medium line is connected on the one hand to the part of the cylinder space of the pull cylinder or the pull cylinder located below the piston and on the other hand to the part of the cylinder space of the counter-flow cylinder located above the piston.

The cylinder spaces of the cylinder-piston units are expediently provided in a uniform cylinder housing which forms the upper machine part. However, they can also each be placed on a base plate and connected to this and to an upper cover plate, e.g. screwed, be. A stiffening plate is expediently arranged in the plane of action of the resultant force, which is firmly connected to both the base plate and the cover plate, e.g. welded or screwed.

A handle can be arranged on the upper machine part.

The basic idea of the invention is that the cylinder-piston units, which the relative movement between the lower machine part, which contains the drawing nozzle, and the upper part of the machine, which is supported on the sleeve, is no longer arranged symmetrically to the drawing nozzle or the axis of the reinforcing bars to be connected, but eccentrically on one side. In order to be able to absorb the high bending moments resulting from the eccentricity of the eccentricity, a so-called counter-rotating cylinder is provided, which is acted upon with pressure medium in the opposite direction to the tension cylinder and generates a bending moment acting in the opposite direction, which generates the tension cylinder arranged eccentrically to the force application resulting bending moment is compensated. In this way, it is possible to attach the device on one side to the reinforcing bars to be connected and to design the aggregates acting on the reinforcing bars or the sleeve to be connected as small or narrow as is absolutely necessary for the force application. These components can thus be attached to the device as a console, which, in terms of its width, easily fits into the spaces between two reinforcing bars.

• Fig. 1 einen Längsschnitt durch eine erste Ausführungsform einer Vorrichtung nach der Erfindung,
• Fig. 2 einen Querschnitt entlang der Linie II-II der Fig. 1,
• Fig. 2a einen entsprechenden Querschnitt durch eine andere Ausführungsform,
• Fig. 3 einen Querschnitt entlang der Linie III-III der Fig. 1, die
• Fig. 3a und 3b Detaildarstellungen verschiedener Ausbildungen der Ziehdüse,
• Fig. 4 eine Frontansicht entlang der Linie IV-IV in Fig. 1,
• Fig. 5 eine Untersicht des oberen Maschinenteils entlang der Linie V-V in Fig. 1,
• Fig. 6 eine Seitenansicht des unteren Bereiches des oberen Maschinenteils,
• Fig. 7 einen der Fig. 1 entsprechenden Längsschnitt durch das obere Maschinenteil einer anderen Ausführungsform einer Vorrichtung nach der Erfindung,
• Fig. 8 einen Querschnitt entlang der Linie VIII-VIII in Fig. 7,
• Fig. 9 einen Längsschnitt durch das untere Maschinen- . teil der Ausführungsform gemäß Fig. 2a,
• Fig. 10 einen Querschnitt entlang der Linie X-X in Fig. 9,
• Fig. 11 einen Längsschnitt durch eine weitere Ausführungsform einer Grundplatte für das untere Maschinenteil und
• Fig. 12 eine Draufsicht auf die Grundplatte nach Fig. 11.

The invention is explained below with reference to the embodiments shown in the drawing. Show it

• 1 shows a longitudinal section through a first embodiment of a device according to the invention,
• 2 shows a cross section along the line II-II of FIG. 1,
• 2a shows a corresponding cross section through another embodiment,
• Fig. 3 is a cross section along the line III-III of Fig. 1, the
• 3a and 3b detailed representations of different designs of the drawing nozzle,
• 4 shows a front view along the line IV-IV in FIG. 1,
• 5 is a bottom view of the upper machine part along the line VV in Fig. 1,
• 6 is a side view of the lower area of the upper machine part,
• 7 shows a longitudinal section corresponding to FIG. 1 through the upper machine part of another embodiment of a device according to the invention,
• 8 shows a cross section along the line VIII-VIII in FIG. 7,
• Fig. 9 shows a longitudinal section through the lower machine. part of the embodiment according to FIG. 2a,
• 10 shows a cross section along the line XX in FIG. 9,
• 11 shows a longitudinal section through a further embodiment of a base plate for the lower machine part and
• 12 is a plan view of the base plate of FIG. 11th

The device 1, as shown in FIGS. 1 to 4, essentially consists of an upper machine part 2 and a lower machine part 3, which are connected to one another by cylinder-piston units and can be moved relative to one another by means of these.

The upper machine part 2 comprises a one-piece cylinder housing 4, in which a cylinder space 5 for a pull cylinder 6 and a cylinder space 7 for a counter-rotating cylinder 8 are arranged through bores. A piston 9 with a piston rod 10 can be moved in the cylinder chamber 5; A piston rod 11 runs in the cylinder space 7.

A fork-shaped support bracket 12 is formed on the cylinder housing 4 (FIG. 2), with which the device 1 can be inserted, enclosing one of the reinforcing bars 13, 14 to be connected, into the spaces between - indicated by dashed lines - adjacent reinforcing bars. A sleeve 15 is pushed over the reinforcing bars 13, 14 and is to be brought into fixed connection with the reinforcing bars 13, 14 by means of the device 1 by radial deformation. The reinforcing bars 13, 14 are provided with surface profiles. These can be the crescent-shaped ribs known from conventional concrete rib steels; but they can also consist of hot-rolled ribs, which are arranged along a helix and form a thread.

A support sleeve 16 is operatively connected to the support bracket 12. The support sleeve 16 consists of a slim lower part 17, with which it is supported at the upper end of the sleeve 15, and a head 18 formed by a flange-like widening, with which it is fixed to the bracket 12 in a force-fitting and positive manner. The entire support sleeve 16 in turn consists of two shell. shaped parts 17 ', 18' and 17 ", 18" (Fig. 5) which are pivotally attached to the bracket 12 by bolts 19 in the direction of the arrows 20. The pivoting movement takes place against the action of flat springs 21, which are fixed laterally on the outside of the bracket 12 by means of pressure pieces 22 and screws 23.

The flange-like widenings 18 'and 18 "of the head of the support sleeve 16 have bevels 24 on the end face. By means of these bevels 24, the device with the bracket 12 can be pushed above a sleeve 15 over a reinforcing bar 13, the two shell-shaped parts of the support sleeve 16 open and close the rod 13 between them again, in the closed position the two parts of the support sleeve 16 can be locked by adjusting bolts 15 (FIG. 6) which are guided in bores 26 in the bracket 12 and in bores 27 in the penetrate flange-like extensions. 18 'or 18 ". A plate 28 is screwed onto the underside of the console 12 as a wearing part.

In FIG. 2a only a cross-section of a further embodiment of the device according to FIG. 1 is shown, in which instead of a pull cylinder 6 two pull cylinders 6a and 6b are arranged side by side and symmetrically to the longitudinal axis of the device. The two pull cylinders 6a and 6b correspond to cylinder spaces 5a and 5b; the counter-running cylinder 8a has a cylinder space 7a, as in the example in FIG. 2.

In the embodiment according to FIG. 1, the lower machine part 3 consists of a base plate 29 with blind holes 30, into which the piston rods 10 and 11 of the pull cylinder 6 and the counter-cylinder 8 are inserted and fastened by means of end screws 31. The base plate 29 is widened in its front area 32 (FIG. 3). The The front end 33 is fork-shaped through a longitudinal slot 34 and serves to receive the drawing nozzle 35.

The drawing nozzle 35 consists of two annular parts, namely a shorter, inner part 36a and a longer, outer part 36b, which are inserted into a recess 66 in the base plate 29. The through the inner, attached to the base plate 29, e.g. screwed part 36a to be closed opening in the outer part 36b must be large enough that the device can be pushed from the side onto the reinforcing bars to be connected. The outer part 36b is then inserted into the recess 66 (FIG. 3a). However, the drawing nozzle can also consist of two halves 37a, 37b, both of which are removable and can each be inserted when the device is attached (FIG. 3b).

A further exemplary embodiment for the design of the base plate is shown in FIGS. 11 and 12, of which FIG. 11 shows a longitudinal section through such a base plate and FIG. 12 shows a plan view.

The base plate 29 'also has a longitudinal slot 34' extending from its front end 33 'with a recess 66 into which the drawing nozzle 35 "is inserted. The drawing nozzle 35" has the shape of a circular ring and consists of a shorter inner part 36a' , for example is fixedly attached to the base plate 29 'by means of a screw, and from a correspondingly longer outer part 36b', which in turn is only loosely inserted into the recess 66.

Since the annular drawing nozzle 35 "is subjected to disproportionately large radial forces during the plastic deformation of a sleeve, which have to be absorbed by the fork-shaped base plate 29 ', the longer part 36b' The drawing nozzle has a shoulder 64 on its underside, which in the inserted state is supported against a corresponding shoulder 65 at the front end 33 'of the base plate 29' (FIG. 11). This ensures that the radial forces occurring in the drawing nozzle in the area of these shoulders 64 and 65 are only released as normal forces on the base plate 29 ', which act perpendicularly on the shoulders, so that the two arms of the drawing nozzle 29' do not spread apart, but instead can only be used in the longitudinal direction.

To produce a press socket joint with a device according to the invention, after assembling the reinforcing bars 13 and 14 and attaching the sleeve 15, the device 1 is brought into position. For this purpose, it is provided with a handle 38 (FIGS. 1 and 4). The device is positioned so that the bracket 12 is above the sleeve 15 in such a position that the two shell-shaped parts of the support sleeve 16 enclose the sleeve 15 and therefore cannot close. The device is held in this position in that the plate 28 (FIG. 6) lies on top of the sleeve 15. The sleeve 15 can be held in the intended position, for example, by looping wire wire around the reinforcing bar 14 immediately below the sleeve. In this position, sufficient space remains available in the area of the lower machine part 3 in order to be able to use the annular part 36 of the drawing nozzle 35. As soon as the drawing nozzle 35 is complete, the device 1 is raised slightly; as a result, the two shell-shaped parts of the support sleeve 16 come out of the area of the sleeve 15, close around the rod 13 and can now be placed on top of the sleeve 15 in the manner shown in FIG. 1.

Through a pressure medium line 39 is now pressure medium supplied in the direction of arrow 40 (FIG. 1), which acts on the pressure surface 41 of the piston rod 11 of the counter-rotating cylinder 8 via the cylinder space 7 and on the piston 9 of the pull cylinder 6 from below by introduction into the lower part of the cylinder space 5. In this way, in addition to the tensile force exerted on the pull cylinder 6, a pressure force is exerted on the counter-rotating cylinder 8.

The ratio of the pressure surface of the tension cylinder 6 to that of the counter-cylinder 8 must be as large as the ratio of the distance b of the axis of the tension cylinder 6 from the axis of the reinforcing bars 13, 14 or the drawing nozzle 35 to the distance a of the axis of the counter-cylinder to the axis of the reinforcing bars 13, 14. The bending moment triggered by the counter-rotating cylinder 8 compensates for the bending moment which arises when the pulling cylinder acts, so that the base plate 29 with the drawing nozzle is slowly and evenly pulled over the sleeve 15, which thereby plastically deformed.

In addition to the solid design of the cylinder housing 4, it is also possible to carry it out in a separate construction. Such an embodiment is shown in FIGS. 7 and 8. The upper machine part 2 'here comprises a pull cylinder _' 42 and a counter-rotating cylinder 43 as individual units which are connected by a base plate 44. At the upper ends, the cylinders 42 and 43 are combined and connected by a cover plate 45. The connections are each made by screws 46.

The mutual stiffening is provided by a stiffening plate 47, which is connected on the one hand to the cylinder 42 via a lug 48 and to the counter-rotating cylinder 43 via lateral wings 49. Otherwise, especially with regard to the lower machine part, this device is in formed in the same way as that which was described in connection with FIGS. 1 to 4.

FIGS. 9 and 10 show yet another embodiment for the lower machine part, which can be used in connection with a device according to FIG. 2a, which is equipped with two pull cylinders. The lower machine part 3 'here again consists of a base plate 50 which is fixedly connected to the piston rods 10 and 11, respectively. In the example, the base plate 50, the outer contour of which is adapted to that of the cylinder housing (FIG. 2a), is provided with blind holes 51, into which the piston rods 10 and 11 are inserted and screwed on the end face by nuts 52.

The base plate 50 has a receptacle 53 which is open from its end face and into which a holding claw 54 is inserted. The holding claw 54 consists of two narrow, elongated _' parts 54' and 54 ", which have recesses 55 at one, thicker end, which together form a circular cross section, into which the drawing nozzle 56 is inserted. The drawing nozzle 56 here consists of approximately two semicircular parts which are interchangeably used as wear parts in the two parts of the holding claw (Fig. 9).

The two parts 54 ′ and 54 ″ then run, forming wedge-shaped contact surfaces 57, into a narrower end 58, in which a bore 59 is made from the rear end face, into which a threaded bolt 60 can be screwed, which can be actuated via a knurled wheel 61 By means of this knurled wheel 61, the holding claw 54 can be drawn into the receptacle 53 until it finds a stop on the end face 63 of the base plate 50 with an upper and a lower shoulder 62. In this way, the insertion depth of the holding claw 54 is limited and a constant distance b between the tension cylinders 10 and 10 'and distance a between the counter-rotating cylinder 11 and the axis of the reinforcing bars 13 and 14 are always ensured.

Claims (27)

1.Device for connecting two butt-jointed reinforcing bars, preferably provided with surface profiles, by means of a sleeve which effects relative movement to one on one by means of a cylinder-piston unit which is arranged on an upper machine part parallel to the axis of the reinforcing bars and is supported with respect to the sleeve Lower machine part arranged drawing nozzle is pressed onto the ends of the reinforcing bars by means of this drawing nozzle, characterized in that the cylinder-piston unit or cylinder-piston units causing the relative movement as a pulling cylinder (6 or 6a, 6b) eccentrically to the one side Drawing nozzle (35) is or are arranged and that on the opposite side of the drawing nozzle (35) of the cylinder-piston unit or. the cylinder-piston units, at least one further cylinder-piston unit is arranged as a counter-rotating cylinder (8 or 8a), which can be pressurized in the opposite direction. 2. Device according to claim 1, characterized in that two cylinder-piston units are provided as the pull cylinder (6a, 6b), which are arranged symmetrically on both sides of the plane of action of the resultant of the acting forces. 3. Apparatus according to claim 1 or 2, characterized in that the piston surfaces of the pull cylinder (6 or 6a, 6b) and counter-cylinder (8 or 8a) in inverse proportion to their distances (b or a) from the axis of the drawing nozzle (35) stand. 4. Device according to one of claims 1 to 3, characterized characterized in that the upper machine housing (2) is provided with a fork-shaped bracket (12) for support against the sleeve (15). 5. The device according to claim 4, characterized in that on the bracket (15) with this non-positively and positively connectable support sleeve (16) is provided. 6. The device according to claim 5, characterized in that the support sleeve (16) consists of two shell-shaped parts surrounding the reinforcing bar (16 ', 16 "), each having a flange-like widening (18', 18") at the upper end. 7. The device according to claim 6, characterized in that the two parts (16 ', 16 ") of the support sleeve (16) with the flange-like widenings (18', 18") on the bracket (12) and parallel to the axis of the drawing nozzle ( 35) extending axes are pivotally connected. 8. The device according to claim 7, characterized in that springs (21) are provided to hold the two parts (16 ', 16 ") of the support sleeve (16) in the closed position. 9. Device according to one of claims 1 to 8, characterized in that the lower machine part (3) with the pull cylinder (6) or with the pull cylinders (6a, 6b) and the counter-cylinder (8 or 8a) connected base plate ( 29 or 29 '), on the end of which the drawing nozzle (35 or 35' or 35 ") is arranged. 10. The device according to claim 9, characterized in that the base plate (29, 29 ') fork-shaped with a Longitudinal slot (34, 34 ') is formed, at the inner end of which the drawing nozzle (35, 35', 35 ") is arranged. 11. The device according to claim 10, characterized in that the drawing nozzle (35, 35 ', 35 ") in a longitudinal slot (34, 34') widening recess (66) in the base plate (29, 29 ') is inserted. 12. The apparatus of claim 10 or 11, characterized in that the drawing nozzle (35, 35 ', 35 ") consists of at least two annular parts (36a, 36b or 36a', 36b 'or 37a, 37b), which are each other to form a closed ring cross-section. 13. The apparatus according to claim 12, characterized in that the drawing nozzle (35, 35 ") consists of two parts of different arc length, of which the shorter, inner part (36a, 36a ') fixed, but releasable, for example by screws, with the Base plate (29, 29 ') connected and the longer, outer part (36b, 36b') can be inserted loosely into the recess (66) in the base plate (29, 29 '). 14. The apparatus according to claim 13, characterized in that the outer part (36b ') on the underside has a shoulder (64) with which it is against corresponding abutments (65) at the front ends (33') of the base plate (29th ') supports (Fig. 11 and 12). 15. The apparatus according to claim 9, characterized in that the drawing nozzle (56) is formed on a two-part holding claw (54), the parts (54 ', 54 ") at one end corresponding and complementary to a total cross-section recesses (55) to form the intended for the deformation of the sleeve (15) th drawing nozzle (56) and are held with the other end (58) in the lower machine part (3 '). 16. The apparatus according to claim 15, characterized in that the outer surfaces of the parts (54, 54 ') of the holding claw (54) are tapered over part of their length and against correspondingly formed contact surfaces (57) in the base plate ( 50) the trained holder (53). 17. The apparatus according to claim 15 or 16, characterized in that the holding claw (54) in the working position relative to the base plate (50) can be fixed. 18. The apparatus according to claim 17, characterized in that for fixing the holding claw (54) is provided in the direction of insertion threaded bolt (60) which cooperates with a corresponding hole in the holding claw (54). 19. Device according to one of claims 9 to 18, characterized in that the holding claw (54) has a stop formed by shoulders (62) to limit the insertion depth relative to the base plate (50). 20. Device according to one of claims 9 to 19, characterized in that the recesses (55) in the parts (54 ', 54 ") of the holding claw (54) to form the drawing nozzle (56) are lined with inserts made of wear-resistant material. 21. The apparatus according to claim 20, characterized in that the inserts are interchangeable. 22. The device according to one of claims 1 to 21, characterized characterized in that the piston rod (10) of the pull cylinder (6) or the piston rods (10a, 10b) of the pull cylinder (6a, 6b) and the piston rod (11) of the counter-rotating cylinder (8 or 8a) with the base plate (29 or 50) are firmly connected, for example screwed. 23. Device according to one of claims 1 to 22, characterized in that the pressure medium line (39) on the one hand with the part of the cylinder space (5) of the pull cylinder (6) or the pull cylinder (6a, 6b) located below the piston (9). and on the other hand is connected to the part of the cylinder space (7) of the counter-rotating cylinder (8 or 8a) located above the piston. 24. Device according to one of claims 1 to 23, characterized in that the cylinder spaces (5 or 5a, 5b and 7 or 7a) of the cylinder-piston units in a unitary, the upper machine part (2) forming the cylinder housing (4th ) are provided. 25. Device according to one of claims 1 to 23, characterized in that the cylinder-piston units are each placed on a base plate (44) and connected to this and to an upper cover plate (45), e.g. screwed, are. 26. The apparatus according to claim 25, characterized in that a stiffening plate (47) is arranged in the plane of action of the resultant force and firmly connected to both the base plate (44) and the cover plate (45), e.g. welded or screwed. 27. The device according to one of claims 1 to 26, characterized in that a handle (38) is arranged on the upper machine part (2).

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