EP0065736A2 - Method and apparatus for making a reinforcing bundle - Google Patents

Abstract

1. Method for producing a reinforcing bundle comprising two parallel adjoining reinforcing rods, reinforcing wires (5-16) wound on reels being fed to a welding unit (4) by feed devices (19, 20), welded together at at least a number of points and severed to the desired length, characterized in that for the production of a reinforcing bundle for flexurally stressed ferroconcrete structural elements in which the lengths of the reinforcing rods are staggered in approximation of the bending moment curve in the ferroconcrete structural member, the reinforcing wires (5-16) are fed at time-intervals to the welding unit (4) by individually controllable feed devices (19, 20) at the same feed velocity, and that, when the last-fed reinforcing wire has been connected with a previously fed reinforcing wire by means of at least one weld joint, the feed of the reinforcing wires (5-16) is interrupted at time-intervals in reverse sequence, each reinforcing wire being severed immediately upon the interruption of its feed and each shorter-severed rod being fed forward over the weld joint by a non-severed reinforcing wire.

Description

The invention relates to a method for producing a reinforcement bundle, which consists of at least two mutually parallel reinforcement bars that touch each other over the entire length, and a device for carrying it out.

It is known to replace reinforcing bars with bundles of at least three equally long, thinner, contacting reinforcing bars (AT-PS 230 074), a connection of the bars being provided at least in some places. The division of the individual rod into welded bundles of rods of the same length has various advantages: surface enlargement, increased resistance to buckling, more favorable moment of inertia and resistance, limitation to a few diameters, and, when replacing rods with large diameters, also lower production costs, since these cost more than several Bars in the medium diameter range have considerable price surcharges. The latter advantage is particularly evident in reinforcement bars with high steel quality. The Reinforcing bars can have the same or different diameters, depending on the overall cross-section to be achieved or the bars available.

It is also known (NL-PS 67478) to produce reinforcement bundles of this type in line with the torque curve in which the ends of the bars are stepped in length. It is also known (DE-OS 25 18 133) to produce such a bundle of rods of the same length, which are shifted against each other.

• In üblichen automatischen Fertigungsanlagen für Gitterträger, Baustahlmatten, usw. werden alle zur Verarbeitung vorgesehenen, im allgemeinen auf Haspeln angeordneten Bewehrungsdrähte in die Fertigungsanlage eingeführt und auch verarbeitet. Die Fertigungsanlagen sind für eine, gegebenenfalls auch umstellbar für andere Ausführungen der zu erzeugenden Bewehrungselemente vorgesehen, wobei die Umstellung, bedingt durch Wechsel der Haspel, Veränderung der Drahtabstände, Schweißzeitabstände, usw. verhältnismäßig lange Stillstandszeiten der Fertigungsanlage bedingt.

None of the above-mentioned documents describes a manufacturing process for such reinforcement bundles from at least two, preferably three or four reinforcement bars, in an automatic production system, for which the following reasons are decisive:

• In conventional automatic production systems for lattice girders, structural steel mats, etc., all reinforcement wires intended for processing, generally arranged on reels, are introduced into the production system and also processed. The production plants are provided for one, possibly also convertible for other designs of the reinforcement elements to be produced, the conversion, due to changing the reel, changing the wire spacing, welding time spacing, etc., resulting in relatively long downtimes of the production plant.

The bundling of reinforcing bars is particularly favorable for the replacement of single bars of larger diameter, for example from a diameter of 18 mm, whereby the bundling of two, three or four bars brings particular advantages. Since the diameter graduation is generally 1 mm, for larger diameters 2 mm is, a large number of single bars of larger diameter must be replaced by reinforcement bundles.

However, the need for single bars of larger diameter is not so great that conventional manufacturing plants can be used rationally after a corresponding change, since both the too frequent changeover to produce the large number of different reinforcement bundles is uneconomical and the use of several manufacturing plants is deficient Utilization is uneconomical.

Therefore, as mentioned for example in DE-OS 25 18 133, straight rod pieces of the required lengths and diameters are bundled individually in order to save working time at least when they are being laid.

The invention has now set itself the task of creating a method which is suitable by means of a simple, rationally usable device for producing reinforcement bundles of any number of bars and any diameter, in preferred embodiments the diameter of the bars also within the bundle are different. and their lengths can be adapted to the course of the bending moment line. In particular, bundles of two, three or four bars of the same and different diameters and the same or different lengths should be able to be produced in a single automatic production system without significant downtimes, the overall system, in particular the number of reels, being economically justifiable on the reinforcement bundles moved about adjusted extent.

According to the invention, this object is achieved in that from a number of reinforcement wires wound on reels, which is at least one larger than the number of bars in the bundle of reinforcements to be produced, a number of reinforcement wires corresponding to the number of bars in the bundle is selected by feed devices, a welding device fed, welded together at least some places and cut to the desired length.

A device suitable for this purpose is characterized by a supply part with reinforcement wires wound on reels and with straightening devices assigned to them, by a selection unit, by a feed unit with controlled selectable feed devices, by an immediately adjoining cutting unit and by a welding unit, the number of reels being at least one is greater than the number of reinforcing bars of the bundle and the ends of all reinforcing wires constantly protrude into the selection unit in which the selected reinforcing wires can be grasped by the feed devices, each feed device preferably consisting of a drive roller and a pinch roller, each drive roller on its own , drivable drive shaft is arranged.

According to the proposal according to the invention, all reinforcement wires are therefore constantly available in the device, of which only those are selected and processed which are required for the reinforcement bundle to be produced. If, for example, two-bar reinforcement bundles are required, Two of four reinforcement wires inserted into the selection device can be gripped and welded together. The changeover to the production of three-bar bundles is therefore limited to the activation of an additional existing reinforcement wire, which is integrated into the processing process. In order to produce a four-bar bundle, the fourth reinforcing bar resting in the selection device is also included in the production.

A device with four reinforcement wires of the same thickness is therefore already able to produce three different types of bundles with bars of the same length in any length. If the reinforcement bundles are to be approximated to the torque curve, so that the lengths of the reinforcement bars are staggered, this can be achieved in that the selected reinforcement wires are fed from the individually controllable feed devices to the welding device at the same feed rate and the feed of the selected reinforcement wires is interrupted in reverse order in time, each reinforcement wire being cut off immediately after the interruption of its feed.

Compared to the aforementioned device, it is additionally provided for carrying out this method that the cutting unit has a number of cutting devices which corresponds to the maximum number of reinforcing bars of the reinforcement bundle and which can be actuated individually in a controlled manner.

The same device, supplemented by separately controllable cutting devices, is therefore capable of bundles of two, three or four bars of any length to generate, with the rod lengths adapted to the torque curve from bundle to bundle and therefore different.

Subsequently, it proves to be particularly advantageous if the reinforcement bars have different diameters in the individual bundle. For example, with only four reinforcement wires in successive diameters, three different two-bar bundles, two different three-bar bundles and one four-bar bundle, i.e. a total of six different types of bundles, each in any length adapted to the course of the moment, can be produced if only reinforcement wires with successive diameters Diameters can be combined. The method suitable for this purpose provides, according to the invention, that the reinforcement wires wound on reels are assigned to the feed devices according to increasing diameter, that from the row of reinforcement wires a group of adjacent reinforcement wires corresponding to the number of bars of the bundle is detected by the feed devices and fed to the welding device, whereby no significant design change of the device described above is required. If the diameters are combined as desired, six different two-bar, four three-bar and one four-bar, i.e. a total of eleven different bundles can be produced, each in any length. The resulting advantage is multiplied particularly when the number of reels is increased. If, for example, twelve reels are provided, the reinforcement wires are provided in the common mean diameters between five and sixteen millimeters, each with a difference of one millimeter, reinforcement bundles are produced, which can replace all the usual single rods, the extent of the stock part being less than the usual width of mesh welding machines.

In a first embodiment, the feed unit can have a number of feed devices corresponding to the total number of reinforcing wires, which can be used individually controlled. So only those are switched on, which should convey the desired reinforcement wires.

A further embodiment of a device provides that the feed unit has a number of feed devices corresponding to the maximum number of reinforcement bars of the reinforcement bundle, all drive rollers and all pinch rollers being combined to form a feed block. and both feed blocks can be displaced in two directions in a plane perpendicular to the working direction and groups of selected reinforcing wires, which project into the selection device next to one another in an ordered manner according to increasing diameter, can be assigned. In this embodiment, significantly fewer feed devices are required, which can be adjusted jointly between the individual feed positions. If, for example, the production of a maximum of four-bar bundles is planned, four feed devices are provided in the feed block, each of which in turn can preferably be driven individually in order to also be able to produce two- and three-bar bundles.

Instead of a single drive of the feed devices, it is also conceivable to have a common one Provide drive, but only the required feed devices attack the reinforcement wires and the others are kept open, for example. If the rollers of the feed devices are spring-mounted, the feed blocks can be moved parallel to one another, the different diameters of the reinforcement wires being compensated for by different compression of the springs.

In another embodiment it is provided that the ends of the reinforcement wires have two common tangential planes which enclose an angle and each feed block can be displaced parallel to a tangential plane. If the center plane of all reinforcement wires runs horizontally, the displacement paths of the feed blocks to the horizontal each include half the angle of the two tangential planes.

The invention will now be described in more detail below with reference to the figures in the accompanying drawings, without being limited thereto.

• Fig. 1 schematisch eine Draufsicht auf eine erfindungsgemäße Vorrichtung,
• Fig. 2 und 3 Schnitte nach der Linie II-II bzw. III-III der Fig. 1,
• Fig. 4 und 5 Stirnansichten erfindungsgemäßer Bewehrungsbündel,und
• Fig. 6 eine Endansicht eines Bewehrungsbündels.

Show it:

• 1 schematically shows a top view of a device according to the invention,
• 2 and 3 sections along the line II-II and III-III of Fig. 1,
• 4 and 5 end views of reinforcement bundles according to the invention, and
• Fig. 6 is an end view of a reinforcement bundle.

The device according to FIG. 1 is equipped with a storage part 1, in which twelve reels for reinforcing wires 5 to 16, each of which has a different diameter, are arranged in two rows. The reinforcement wires 5 to 16, for example, each have a different diameter by 1 mm, increasing from 5 mm, and correspond to the common reinforcement wires that can be wound on reels. Each reel is equipped with a conventional balancer arm, not shown or shown, and a spring-loaded brake that is released when the balancer arm is actuated. The reels for the reinforcement wires with a diameter from 12 mm, i.e. for the wires 12 - 16, are additionally equipped with a hydraulic driver. Before each reel, the reinforcement wire 5 to 16 is guided through a separate straightening device 18 to the selection unit 2, into which the ends of the reinforcement wires 5 to 16 protrude. The selection unit 2 is assigned a feed unit 3, which has a plurality of feed devices 19, 20, each consisting of a drive roller 19 and a pinch roller 20, each of which, individually controlled, can move one of the ends of the reinforcing wires 5 to 16 projecting into the selection unit (Fig. 2,3). Immediately after the feed unit 3 is a cutting unit 17, which consists of the maximum number of rods of the bundle corresponding, individually controlled scissors. The design of these scissors essentially corresponds to that used in the manufacture of lattice girders or structural steel mats, and is therefore not shown in more detail. The cutting unit 17 is followed by a welding unit 4 which combines the rods into bundles and ejects them at the end of the device. The direction of work corresponds to arrow A.

The number of reels and thus the reinforcement wires 5-16 in the illustrated embodiment is three times the maximum number of bars to be bundled. Generally it is at least one bigger. This means that more and more reinforcement wires 5 - 16 are available in the selection device 2 than are required for the production of a bundle.

The number and the diameter of the reinforcing wires 5 to 16 can therefore be selected with the aid of the feed devices 19, 20.

In the embodiment shown in FIG. 2, twelve reinforcement wires 5 to 16 are shown, the ends of which protrude into the selection unit 2. A feed device 19, 20 is assigned to each of these reinforcement wires, the drive shafts 21 of the drive rollers 19 being individually drivable. The reinforcing wires 5 to 16 are arranged in one plane with increasing diameter, starting from the left in the drawing. Since bars with adjacent diameters are usually bundled, for example to produce a bundle according to FIG. 4, the feed devices are set in motion, between which the reinforcement wires 7, 8, 9 are clamped. If the bundle of staggered bars according to FIG. 6 is to approach the course of the bending moment, the feed device assigned to the reinforcement wire 8 begins with the feed. After the calculated time intervals, the feed device assigned to the reinforcement wire 7 and finally the feed device assigned to the reinforcement wire 9 are set in motion, all feed devices 19, 20 running at the same speeds, in particular using the cycle method. The on this Reinforcement wires reaching the welding unit 4 are welded to one another at least in some places. According to the precalculated length, the advance of the reinforcement wire 9 is first stopped and at the same time cut off by a pair of scissors of the cutting unit 17 assigned to it. The feed of the wires 7 and 8 is continued, as is the welding. Subsequently, the feed of the wire 7 is stopped as soon as its pre-calculated length is reached and another pair of scissors assigned to it cuts it off. The feed of the wire 8 is continued up to the total length of the bundle, missing welds being carried out. Finally, the reinforcement wire 8 is also cut by a further, individually controlled pair of scissors and the finished bundle is ejected from the device.

The procedure for producing a bundle according to FIG. 5 is the same, except that a total of four reinforcement wires 7, 8, 9, 10 are processed. This version is also suitable for bundling non-adjacent reinforcement wires, since any feed device can be set in motion by the individual control.

The feed unit shown in FIG. 3 shows three feed devices 19, 20, which are combined in two feed blocks 22. This feed unit can be used for production systems in which only two- or three-bar bundles are to be produced, in which adjacent diameters are used. If the production of four-bar bundles according to FIG. 5 is also provided, each feed block 22 is equipped with four rollers, so that four feed devices 19, 20 can be used.

einschließt. Die Vorschubeinrichtungen 19,20 ergreifen daher jeweils eine Gruppe von benachbarten Bewehrungsdrähten 5 bis 16, wobei auf Grund der schrägen Führungsbahnen 23 keine eigene Anpassung an die unterschiedlichen Durchmesser der Bewehrungsdrähte erforderlich ist. Die Treibrollen 19 der Vorschubeinrichtungen sind wiederum einzeln antreibbar, sodaß innerhalb jeder Gruppe wieder beliebige Kombinationen von Bewehrungsdrähten möglich sind. Für die Änderung der Bündelzusammensetzung werden die Führungsbahnen 23 auseinanderbewegt, die Vorschubblöcke 22 an die gewünschte Stelle verschoben und die Führungsbahnen 23 wieder aneinander angenähert, worauf mit dem Vorschub der geänderten Gruppe von Bewehrungsdrähten in der zu Fig. 2 beschriebenen Weise begonnen werden kann.The reinforcement wires 5 to 16 are in turn arranged with increasing diameter in the selection unit 2, starting from the left, the common center plane running horizontally. The reinforcement wires 5 to 16 are aligned so that they have two common tangential planes, which enclose the angle plate with each other. Each feed block 22 is displaceable in the direction of arrow B on a guide track 23 which is height-adjustable in the direction of arrow C, each guide track 23 running parallel to a tangential plane and therefore the angle with the horizontal

includes. The feed devices 19, 20 therefore each grip a group of adjacent reinforcement wires 5 to 16, and because of the oblique guideways 23, no individual adaptation to the different diameters of the reinforcement wires is necessary. The drive rollers 19 of the feed devices can in turn be driven individually, so that any combination of reinforcement wires is again possible within each group. To change the bundle composition, the guideways 23 are moved apart, the feed blocks 22 are moved to the desired position and the guideways 23 are brought closer together again, whereupon the feed of the changed group of reinforcement wires can be started in the manner described for FIG. 2.

The method according to the invention enables, by means of a relatively simple device, the automatic production of reinforcement bundles in a large number of different combinations of bars, lengths and diameters without time-consuming changes the system are necessary. The system is advantageously controlled by means of electronic data processing, by means of which the reinforcement wires are automatically selected, the feed devices assigned to these selected wires are used, and the shears of the cutting unit assigned to the selected wires are used.

Above all, the preferred embodiment of the invention, in which only reinforcement wires with different diameters are used, provides a further advantage of great importance. In many countries, there are different provisions regarding the cross-sectional portion of the reinforcement bars that are continuous over the entire length when the torque is adjusted. It can also be provided over the entire length without any modification of the device by appropriate control of each of the reinforcement wires to be combined into a bundle. According to the example of FIG. 6, about a third of the total reinforcement runs up to the support, since the reinforcement wire 8 with the middle cross section is the longest. If a higher proportion is required, wire 9 becomes necessary; if a lower proportion is required, wire 7 is provided in its entire length and the others are shortened.

Claims (9)

1. A method for producing a reinforcement bundle, which consists of at least two mutually parallel reinforcement bars that touch each other over the entire length, characterized in that from a number of reel wires wound on reels (5 to 16), which is at least one larger than the number of bars in the reinforcement bundle to be produced, a number of reinforcement wires corresponding to the number of bars in the bundle is selected, which are detected by feed devices, fed to a welding device, welded to one another at at least some points and cut to the desired length. 2. The method according to claim 1 for the production of a reinforcement bundle for reinforced concrete components subjected to bending, in which the lengths of the reinforcing bars are staggered approximately the course of the bending moment line in the reinforced concrete component, characterized in that the selected reinforcement wires are shifted from the individually controllable feed devices to the welding device with the same time Feed speed are fed, and that the feed of the selected reinforcing wires is interrupted in reverse order in time, whereby each reinforcing wire is cut off immediately after the interruption of its feed. 3. The method according to claim 1 or 2, for producing a reinforcement bundle, the reinforcement bars have different diameters, thereby characterized in that the reinforcing wires (5 to 16) wound on reels are assigned to the feed devices in order of increasing diameter, that from the row of reinforcing wires a group of adjacent reinforcing wires corresponding to the number of bars of the bundle is detected by the feed device and fed to the welding device. 4. Apparatus for carrying out the method according to one of claims 1 to 3, characterized by a storage part (1) with reel wires wound on reels (5 to 16) and with these associated straightening devices (18), by a selection unit (2), by a Feed unit (3) with controlled selectable feed devices (19, 20), by _: an immediately adjacent cutting unit (17) and by a welding unit (4), the number of reels being at least one greater than the number of reinforcing bars of the bundle, and the ends of all reinforcement wires (5 to 16) continuously projecting into the selection unit (2) in which the selected reinforcement wires (5 to 16) can be grasped by the feed devices. 5. The device according to claim 4, characterized in that each feed device (19, 20) consists of a drive roller (19) and a pinch roller (20), each drive roller (19) being arranged on its own drivable drive shaft (21). 6. The device according to claim 5, characterized in that the feed unit (3) has one of the total number of reinforcing wires (5 to 16) corresponding number of feed devices (19, 20) which can be used individually controlled. 7. The device according to claim 4 or 5, characterized in that the feed unit (3) has a number of feed devices (19, 20) corresponding to the maximum number of reinforcement bars of the reinforcement bundle, all drive rollers (19) and all pinch rollers (20) each are combined to form a feed block (22), and both feed blocks (22) can be shifted in one plane perpendicular to the working direction (A) in two directions (B, C) and groups of selected reinforcement wires (5 to 16), which are sorted according to increasing diameter protrude side by side into the selection device (2), can be assigned. 8. The device according to claim 7, characterized in that the ends of the reinforcing wires (5 to 16) have two common tangential planes which enclose an angle (α) and each feed block (22) is displaceable parallel to a tangential plane. 9. The device according to claim 4, characterized in that the cutting unit (17) has a number of cutting devices corresponding to the maximum number of reinforcement bars of the reinforcement bundle, which can be actuated individually controlled.

Images