FR2656561A1 - METHOD AND AUTOMATIC DEVICE FOR REALIZING A METAL REINFORCEMENT AND METAL REINFORCEMENT REALIZED BY THIS METHOD. - Google Patents

Abstract

The invention relates to a method for producing a metal reinforcement comprising corner strings (1) and optionally intermediate strings (2) linked together by transverse frames (4) formed by cross wires (3) and in which the cross wire (3) cut beforehand is folded by pressing on at least one corresponding corner string (1), the cross wire (3) is welded in the bending angle with said corner string, the remaining free part of the cross wire (3) is folded by pressing on at least one other corresponding corner string (1), the cross wire (3) is electrically welded in the bending angle, and the remaining free parts of the cross wire (3) to close the frame (4) of the reinforcement. The invention also relates to an automatic device for producing a metal frame and a metal frame produced according to this method.

Description

The present invention relates to a method and

  a device for producing a metal frame

  parallelepipedal or prismatic

  especially in reinforced concrete constructions.

  The present invention also relates to a

  metal frame made by this method.

  The reinforcements generally consist of bars forming longitudinal longitudinal threads and sometimes longitudinal intermediate threads interconnected by polygonal transverse frames formed by transverse son and welded to said strands. The methods for producing such frames, for example quadrangular, comprise independent operations of dressing, shearing of the longitudinal threads, welding of the transverse threads on the spun ribs to form a welded flat panel and also bending operations of the threads. crosses the panel to form the

frames of the frame.

  The transverse son are provided with a folded end forming a pin allowing the closure of the frames by the elasticity effect of the metal, the pin hanging on an end thread of the

sign.

  These processes have different disadvantages

  vantages. Indeed, the separation of the operations listed above and carried out on different independent workstations, leads to the existence of stocks of semi-finished products such as threads cut to length and panels These stocks are difficult to manage account- given the number of products due to the varieties of length and diameter of threads used Reserves of semi-finished products

  therefore occupy a large area.

  On the other hand, the frame frames are not rigidly closed and a bend at the end of the cross son, to form a pin or a hook closing the frame, causes a lack of mechanical rigidity perpendicular to the rope and difficulties of setting in place reinforcements on the loading areas, manipulations deforming frames of the frame by their weight during the booting. In addition, the welding operation precedes the folding operation, which can cause, during said bending, tearing of the welds between the

executives and ropes.

  The purpose of the present invention is to avoid, among other things, the various disadvantages enumerated above and to propose a method and an automatic device for producing reinforcements in particular.

  made of steel, for example parallelepipedal or prismatic

  ticks giving continuous reinforcement frames

  without any need for storage or storage of material other than the basic wire coils. The method according to the invention is characterized in that to make part of the frame and weld one of the frames on the threads: the coils of threads are unwound simultaneously to form the longitudinal threads and the transverse thread, the straighteners are straightened and the transverse threads, said straightened threads being guided in parallel by defining the volume and the angles of

  the frame and being moved together by successive steps

  sifs in a direction of travel and said straightened cross-wire being guided longitudinally and perpendicular to the direction of travel of the threads, the cross-thread is positioned and said cross-wire is cut to a length determined by the perimeter of the frame to be produced, bends the previously cut transverse thread by pressing on at least one corresponding angle thread, itself bearing against a fixed tool, the free portions of the cross thread winding on said wire and the folding plane of said wire of crossbar defining an angle less than 90 with the direction of travel of the ropes,

  the wires are electrically welded

  poured into the bending angle with said corresponding angle yarn, and then, in another bending of the transverse yarn, the free portion of said transverse yarn is bent by pressing on at least one other yarn of corresponding angle, said free portion previously bearing elastically on at least one squaring wedge to form a portion of the frame of the armature whose plane is perpendicular to the running direction of the threads and the folding plane of the remaining free parts of said cross-wire defining an angle less than 90 with the direction of travel of the threads, the transverse thread is electrically welded in the bending angle with said corresponding angle thread,

  and when the two free

  Transverse wire threads are joined, said remaining free portions are welded to close the frame of the frame, said remaining free portions being elastically supported on a squaring wedge in order to close the frame in a plane perpendicular to the direction.

of movement of the ropes.

  According to another characteristic, the two remaining free portions of the transverse wire forming the frame of the frame are welded to an intermediate rope. Preferably, the bending and / or welding operations are carried out simultaneously on several crosshead wires at different successive stations. The present invention also relates to a device for carrying out the method characterized in that it comprises, a frame, at least two reels of the longitudinal threads and at least one reel of the transverse thread, means for straightening the strands longitudinal and transverse thread, means for moving, guiding and positioning the threads parallel to a direction of travel, said strands defining the dimensions of the armature, means for moving, guiding, setting length, shearing and positioning of the transverse wire perpendicular to said strands, at least one folding station and electrical welding of the transverse wire, at least one electric welding station, and means for lengthening the reinforcement associated with a shear multi-cut

for said strings.

  According to other features, the bending and welding station comprises at least one fixed tool provided with a guide groove and holding the corresponding wire during the folding of the cross wire around said wire, at least one moving tool moving towards the fixed tool for causing the bending of the transverse wire and welding electrodes secured to said tools to weld the wire and the cross wire after bending

said transverse wire.

  said folding and welding station comprises at least one squaring wedge for positioning, during welding, the free portions of the transverse wire perpendicular to the direction of

scrolling of the ropes.

  the welding station comprises at least one squaring wedge for positioning, during welding, the remaining free portions of the transverse wire perpendicular to the direction of travel of the threads, the means for moving, guiding and positioning the threads and the bending stations and / or electric welding are movable parallel to the direction of travel of the ropes, at least one step corresponding to the distance between two

frames of the frame.

  The present invention also relates to

  a metal frame for example made of steel used

  in reinforced concrete constructions, carried out by

  the process according to the invention and having the characteristics

  following: the longitudinal threads are interconnected by rigid transverse frames closed and formed by a transverse wire, the remaining free parts of the cross wire are welded together, the remaining free parts of the wire of

  crossbeams are welded on a wire.

  The invention will be better understood by means of

  the description which will follow, given only to

  By way of example and with reference to the appended drawings, in which: FIG. 1 is a top view of the device according to the invention, FIG. 2 is a schematic perspective view showing the various embodiments of the reinforcement by the device according to the invention,

  Figs. 3 to 5 are perspective views.

  showing different examples of reinforcement

  performed by the device according to the invention.

  FIG. 1 shows the device according to the invention for producing a metal reinforcement, for example made of steel, quadrangular with six longitudinal threads, four of which form angle threads 1, the other two threads

  being intermediate stitches 2 (FIG. 3).

  The device comprises a frame 10 formed of a metal frame 11 This frame is provided with parallel horizontal guides formed of at least two cylindrical columns 12 placed between two

column supports 13.

  The device also comprises, with respect to the running direction S of the threads 1: a first guide means A for threads 1 and 2, a second guide means B for threads 1 and 2, a third guide means C for threads 1 and 2 , means D of displacement, of guiding,

  lengthening, shearing and positioning

  3, a first station E for bending and electrically welding the transverse wire 3, a second station F for folding and electrically welding the free portions of the cross-wire 3, a transverse wire 3 perpendicular to the wires 1 and 2. station G of electrical welding of the remaining free parts of the cross wire 3, and a means H of setting the length of the armature. The horizontal guide means A, B and C are formed by rectilinear tubes 14, 15 and 16, respectively, which are adjustable in spacing and define the sectional dimensions of the reinforcement and

  the number of threads I and 2 of the armature.

  The guide means B and C are slidably mounted on the columns 12 via

brackets respectively 17 and 18.

  The first folding and welding station E is secured, on the lower side of the frame, to the guide means C and slides on the columns 12 also via the supports.

18.

  The second folding and welding station F and the welding station G also slide on the columns 12 via supports

respectively 19 and 20.

  The horizontal displacement of the guide means B and C and the folding and / or welding stations E, F and G on the columns 12 makes it possible to

  modify and adjust according to the pace of

  1 and 2 spacing, the spacing frames 4 formed by the cross son 3 which is constituted by the frame. The means H of lengthening of the armature comprises, subject to the frame 10, but may be independent, a shear 21 which cuts the set of the ropes 1 and 2 of the quadrangular reinforcement, the triggering of said shears 21 being controlled by a program defining the length of the frame made. The means D for displacing the transverse wire 3 comprise a straightening system, not shown, of said transverse wire, a guide tube 22, and rollers, not shown, measuring the length of the transverse wire 3. said rollers, the length of the cross-wire 3 is defined by an electronic programming selection, then said cross-wire is cut by a shear 23 to the corresponding desired length

  substantially at the perimeter of a frame 4 of the frame.

  The soldering station E comprises, for example for each wire of lower angle 1, a fixed tool 24 provided with a groove 25 in which the thread of corresponding angle slides. This groove may consist of a shoulder in which the 1) so that, as will be seen later, the cross wire 3 can be wound around the corresponding wire 1 which then forms a wedge

folding.

  The two symmetrical fixed tools 24 determine a spacing corresponding to the length

  on one side of frame 4 of the frame.

  Each fixed tool 24 is secured to a movable tool 26. On the other hand, each fixed tool 24 is provided with a welding electrode, not shown, which when the mobile tool 26 presses the transverse wire against the corner wire. 1 corresponding performs electrical spot welding between the cross-wire 3 and the two lower angle threads 1, said welds being made after the folding operation. The folding and welding station F comprises, for example for each wire 1 of upper angle, a fixed tool 27 provided with a groove 28 in

  which slides the corresponding angle thread.

  This groove may also be constituted by a shoulder in which the corner thread 1 is supported so that the transverse thread 3 can be wound around the thread 1 which then forms a corner

folding.

  The two symmetrical fixed tools 27 also determine a spacing corresponding to the length of one side of the frame 4 of the armature. Each fixed tool 27 is associated with a movable tool 29. On the other hand, each fixed tool 27 is provided with a welding electrode, not shown, which when said movable tool presses the cross-wire 3 against the corresponding angle yarn 1, performs the electrical spot welding of the cross-wire 3 on the two upper corner yarns 1, said weld being realized

after the folding operation.

  This station F is also provided with squaring wedges 30 which position the bent wire 3 folded in the previous folding and welding station E. The welding station G comprises at least one electrode 31 for welding the remaining free portions of the cross-wire 3 and a squaring wedge 32 which positions said remaining free portions. Referring now to Figs 1 and 22,

  the method of producing the reinforcement will be described.

  In FIG. 2, the various sequences of realization

  this frame have been separated in order to

  facilitate the understanding of the description that will

  to follow. Wire for wire 1 and wire 2

  come from a station, not shown, to

  bobbins and straightening said yarns.

  The straightened yarns are held as a loop in a buffer pool, not

  shown, feeding the device.

  Strands 1 and 2 straightened are position-

  born in the horizontal guide means A, B and C

  and move in the device sequentially

  successive step, the step corresponding to the distance separating at least two frames 4 of the frame. The transverse thread 3 also comes from a station, not shown, unwinding a coil and straightening the thread.

  is positioned by the guide tube 22.

  When moving, the length of the thread

  3 is defined by an electronic selection

  said cross-wire is cut by the shear 23 to the corresponding desired length

  substantially at the perimeter of a frame 4 of the frame.

  After setting the length of the cross wire

  3, it is placed horizontally and symmetrically-

  1 1 to the intermediate threads 2, then folded under the action of the mobile tools 26 of the station E to form for example a lower horizontal side of the frame 4 (Fig 2) The transverse wire 3 is bent in a U-shape, the two substantially vertical wings 6 of the U being obtained, under the action of the moving tools 26, by folding the two free parts

transom wire 3.

  The two wings 6 of the U are obtained by the support of the transverse thread 3 on the corresponding lower corner threads 1, the cross thread 3 winding on said threads 1 during folding and the threads 1 being themselves in abutment against stationary tools 24 The plane formed by the wings 6 of the U defined, with the running direction S of the ropes 1

  and 2, an angle ci less than 90 (Fig 2).

  This characteristic is essential for the production of a frame 4 to be laterally positioned perpendicular to the

running 1 and 2.

  When the moving tools 26 press the transverse thread 3 against the lower angle threads 1, the electrodes secured to the said fixed tools 24 perform the spot welds between the transverse thread 3 and the lower angle threads 1, the welds being executed. after the folding operations. Then, the six strands 1 and 2 as well as the transverse wire 3 folded in U and welded to the two lower angle threads 1, are placed, after a shift of one step, in the second station F folding and welding. When they are positioned in this station F, the two flanges 6 of the transverse thread 3 forming an angle less than 90 with the direction of movement S, rest on the squaring wedges.

  which position the two wings 6 of the U perpendicular

stretching to the strings 1 and 2.

  The squaring wedges 30 move, by elasticity of the metal, the free parts of the cross-wire 3 to hold them in a position perpendicular to the strands 1 and 2 before the operation

bending and welding next.

  Under the action of the mobile tools 29 of the station F, the wings 6 of the U are then folded to form the frame 4 of the frame, the folding being obtained by supporting the cross-member wire 3 constituting the wings 6 of the U against the Angle ropes 1 upper

correpondants.

  The remaining free portions 7 of the transverse thread 3 are wound on the upper corner yarns 1 which form a bending wedge, the two upper corner yarns 1 being each resting on the tool

fixed 27 corresponding.

  The angle formed by said remaining free portions 7 of the transverse wire 3, at the exit of the station F, form an angle inférieur less than 90 with the

  S direction of travel of the strands 1 and 2 (Fig 2).

  After folding the flanges 6 of the U, the transverse wire 3 is electrically welded on the higher angle yarns 1 by the electrodes associated with stationary tools 27 of the station F. The part of the transverse wire 3 located between two welding points made successively on the two stations E and F form the lateral sides of the

frame 4.

  In order to close the frame 4 by welding the two remaining free parts 7, the threads 1 and 2 and the transverse thread 3 are moved at least one step in the direction of travel S on the welding station G. The two parts remaining free 7 forming an angle less than 90 with the direction of scroll S are supported, when positioning the frame 4 in the station G, on the squaring wedge 32 which places the remaining free portions 7 of the cross thread

  3 perpendicular to the strands 1 and 2.

  The remaining free portions 7 are electrically welded by the electrode 31 to close the frame 4 of the frame, the welding can be performed between the remaining free portions 7 of the cross-wire 3 and an upper intermediate thread 2, as in the embodiment of six strands, or between the two remaining free portions 7 of the cross-wire 3 in the embodiment for example of a

four-wire frame.

  In the exemplary embodiment of a six-wire reinforcement, the lower intermediate thread 2 is welded on the same welding station G as that used for welding the free parts 7 of the cross-wire 3, the welding being then performed between said lower intermediate thread and the lower side of the frame 4 of the armature by a welding electrode, not shown, for example placed below the welding electrode 31 of the station G. The current reinforcement element realization

  is carried by a gutter 33 (Fig 1).

  Preferably, the bending and / or welding operations are carried out simultaneously on a plurality of crosshead wires in different successive stations. FIGS. 3 to 5 represent various reinforcements that can be made by the device.

according to the invention.

  FIG. 3 represents a six-wire reinforcement comprising four corner yarns 1 and two intermediate yarns 2, the free portions of the transverse yarn 3 forming the frames 4 being welded between

  they and on one of the intermediary threads 2.

  FIG. 4 represents a four-wire frame with an angle of 1, the free portions of the transverse wire 3 forming the frames 4 being welded between

they.

  Finally, FIG.

three ropes 1.

  The process according to the invention provides in the embodiment and in the characteristics of

the frame of many advantages.

  First of all, the reinforcement is made of rigid closed frames and the bending before welding allows a large surface contact between transverse and stranded wires and thus an improvement of

the quality of the weld.

  Moreover, the removal of the pin causes, on the one hand, a saving of material in cross-wire and, on the other hand, greater safety in handling, the protruding pins being able to

  cause injury during handling.

  On the other hand, the method and the device according to the invention make it possible to obtain a rigid closed-frame reinforcement having an improved structural quality and allowing ease of handling, both of the reinforcement per unit and in the bale packaging. and loading on

means of transport.

Claims (9)

  1 Method for producing a parallelepipedal or prismatic metal reinforcement, in particular for reinforced concrete constructions, comprising rods forming angular threads (1)   longitudinal and possibly intermediate   longitudinal diaries (2) interconnected by transverse polygonal frames (4) formed by transverse threads (3), in which shearing and welding operations are carried out in particular for longitudinal threads (1, 2) and threads; cross-beam (3) and bending operations of the transverse son (3) to form the frames (4) of the armature, characterized in that to achieve part of the armature and weld one of the frames (4) on strings (1, 2):   at the same time thread spools are rolled out to form the longitudinal threads (1, 2) and the cross thread (3), the spines (1, 2) and the cross thread (3) are straightened, said spines (1, 2 ) straightened being guided in parallel by defining the volume and the angles of the armature and being moved together in successive steps in a running direction and said straightened cross-wire (3) being guided longitudinally and perpendicularly to the running direction of the threads ( 1, 2), the transverse thread (3) is positioned and said thread is cut to a length determined by the perimeter of the frame (4) to be produced,   the transverse wire (3) is folded beforehand   cut by pressing on at least one corner thread (1) corresponding itself bearing against a fixed tool (24, 27), the free portion (6) of the cross thread (3) winding on said thread (1) and the folding plane of said cross-wire (3) defining an angle less than 90 'with the running direction of the ropes (1, 2),   the bead wire (3) is electrically welded into the bending angle with the corresponding corner yarn (1), and then, when the bending wire (3) is folded again, the remaining free part is bent ( 7) of said transverse wire (3) by pressing on at least one other corresponding thread-angle (1), said free portion (7) of the cross-bar thread (3) coming to bear elastically on at least one wedge of squareness (30) to form a portion of the frame (4) of the armature whose plane is perpendicular to the running direction of the ropes (1, 2) and the folding plane of said remaining free portion (7) of the wire of traveres (3) defining an angle less than 90 with the direction of travel of the threads (1, 2), the transverse wire is electrically welded in the bending angle with said corresponding angle thread (1), and when the two remaining free parts (7) of the transverse wire (3) join, said free parts are welded to close the frame (4) of the ar mature, said free portions being supported on a squaring wedge (32) to close the frame (4) in a plane perpendicular to the direction of scrolling strings (1, 2).   The process according to claim 1, wherein   characterized in that the two contiguous free portions (7) of the transverse thread (3) forming the frame (4) of the reinforcement are welded to at least one intermediate thread (2).   Process according to claims 1 and 2,   characterized in that the folding and / or welding operations are carried out simultaneously on several cross-son (3) in different successive stations. 4 Automatic device for the implementation   process according to claims 1 to 3,   characterized in that it comprises a frame (10), at least two wire reels longitudinal (1, 2) -   and at least one traverse wire reel (3), straightening means (1, 2) and crosshead wires (3), moving, guiding and positioning means (A, B, C) threads (1, 2) parallel to a direction of travel, said threads (1, 2) defining the dimensions of the armature, means (D) for moving, guiding, setting in length, shearing and positioning transverse yarn (3) perpendicular to said yarns (1, 2), at least one station (E, F) for bending and electrically welding the transverse yarn (3), at least one electric welding station (G), and means (H) for lengthening the armature associated with a shear (21) with a cut   multiple for said strings (1, 2).   Device according to claim 4, characterized in that said station (E, F) for folding and welding comprises at least one fixed tool (24, 27) provided with a groove (25, 30) for guiding and holding the rope corresponding angle (1) when folding the transverse wire (3) around said wire, at least one moving tool (26, 29) moving towards the fixed tool (24, 27) to cause the folding of the wire crossbar (3) and welding electrodes secured to said tools (24, 26, 27, 29) for welding the wire (1) and the cross wire (3) after folding said cross-wire.   Device according to claims 4 and   5, characterized in that the folding and welding station (F) comprises at least one squaring wedge (30) for positioning, during welding, the free portions (6) of the transverse wire (3) perpendicularly   in the direction of travel of the ropes (1, 2).   7 Device according to claim 4, characterized in that the station (G) welding comprises at least one squaring wedge (32) for positioning, during welding, the free parts   (7) remaining perpendicular transverse wire (3)   in the direction of travel of the ropes (1, 2).   8 Device according to any one of   Claims 4 to 7, characterized in that the means   (B, C) for moving, guiding and positioning the ropes (1, 2) and folding stations (E, F, G)   and / or electrical welding are movable   parallel to the direction of travel of the ropes (1, 2) by at least one step corresponding to the distance separating two frames (4) of the frame.   9 Metal reinforcement, in particular for reinforced concrete constructions, characterized in that it is produced by the method according to the Claims 1 to 3.   Reinforcement according to claim 7, characterized in that it comprises longitudinal threads (1, 2) interconnected by rigid transverse frames (4) closed and formed by threads transom (3).   11 reinforcement according to claim 10, characterized in that the remaining free parts of the   transverse wire (3) are welded together.   Armature according to claim 10, characterized in that the remaining free parts of the   transverse wire (3) are welded to a wire (2).