EP0132254B1 - Reinforcing cage for the space reinforcement of concrete structures - Google Patents

Abstract

1. A reinforcing cage for three-dimensional reinforcements for reinforced concrete members, more particularly for reinforcements in cage form for reinforced concrete structural components in bar or rod form, such as columns, beams, drilled foundation piles or the like, which reinforcing cage is formed from stirrups (1) extending peripherally so as to be closed over the entire periphery and is adapted to be joined to a longitudinal reinforcement which is formed by rods (4) and together with which it forms the reinforcement, the stirrups (1) which form the reinforcing cage being interconnected by two longitudinally extending connecting rods (2) disposed on the outside of the stirrups, and being held in the mutual stirrup spacing provided for the three-dimensional reinforcement, the connecting rods (2) consisting more particularly of steel and being welded to the stirrups (1), characterised in that for the purpose of allowing easy stacking of at least three such reinforcing cages one inside the other in a transverse direction the longitudinally extending connecting rods (2) are situated in each case only at the two points of intersection of the stirrup contour and a straight line (8) passing through the centre of gravity (7) of the stirrup contour or in the immediate vicinity of these points of intersection at the outside of the stirrups (1), said straight line extending - in the case of a polygonal stirrup contour - at least through a corner zone of the stirrup contour or through the immediate vicinity of said corner zone, and, in the case of the longitudinally extending connecting rods (1) being disposed in the vicinity of the said points of intersection, said connecting rods are preferably disposed on both sides of the straight line (8).

Description

The invention relates to a reinforcement cage for spatial reinforcements of reinforced concrete bodies, in particular for cage-like reinforcements for rod-shaped concrete components, such as columns, beams, bored piles or the like. Which reinforcement cage is formed from brackets running in the circumferential direction over the full circumference and to be joined together with a longitudinal reinforcement formed by bars, with which they form the reinforcement, is provided, the stirrups forming the reinforcement cage being connected to one another by two longitudinal connecting rods arranged on the outside of the stirrups and being held in the mutual spacing of the stirrups provided in the spatial reinforcement, and in particular the connecting rods are made of steel and are welded to the brackets.

Spatial reinforcements, which consist of a longitudinal reinforcement formed by bars and a transverse reinforcement formed by brackets running transversely to the bars of this longitudinal reinforcement, are used extensively in construction. These are, in particular, spatial reinforcements for rod-shaped concrete components, such as columns, beams, bored piles or the like. The production of such reinforcements is generally carried out on the construction site, with the bars forming the longitudinal reinforcement and the stirrups forming the transverse reinforcement first being in the intended position Relative to each other and then connected to each other, which connection is usually made with binding wire, after which these reinforcements are installed. This causes the correct positioning of the brackets forming the transverse reinforcement relative to one another and to the bars forming the longitudinal reinforcement, which complicates the fact that, on the construction sites where the reinforcements are joined, there are generally no mechanically operating devices, with which a reduction in the work required for the mutual positioning could be achieved. On the other hand, the production of such spatial reinforcements in a machine-equipped production site remote from the construction site is practically out of the question, since the volume of such reinforcements is relatively large compared to the amount of material contained in such a reinforcement and the transport of such reinforcements over longer distances the large volume causes high costs.

Reinforcement cages are also known, which are provided for forming spatial reinforcements of beams or posts made of reinforced concrete and consist of brackets running along the circumference and longitudinal connecting rods arranged on the outside of these brackets. In order to form the spatial reinforcement of a beam or post, two or more such reinforcement cages are intended to be pushed into one another in one or more transverse direction (s) until the brackets are aligned with one another in order to obtain a reinforcement with greater load-bearing capacity, and this will be the case all longitudinal bars of such a reinforcement cage are arranged on the section of the frame circumference lying on one side of a reference straight line running through the geometric center of the transverse frame; Furthermore, a tapering shape of the bracket or an arrangement of the longitudinal connecting rods on spacers is provided for inserting the brackets of a reinforcement cage between the longitudinal connecting rods of another reinforcing cage. Such training complicates manufacturing significantly. A simple stacking of more than two reinforcement cages in a transverse direction, as is necessary for transport with a small transport volume, does not seem feasible in this known reinforcement cage.

It is an object of the present invention to provide a reinforcement cage of the type mentioned in the opening paragraph, which offers the possibility of easily, smoothly and easily stacking a number of such reinforcement cages in a transverse direction and thus economically transporting a large number of such reinforcement cages of one of those Construction site allows remote production site to construction site with little effort in transport volume. Simple manufacturing should also be possible, and the manufacturing tolerances that usually occur should not have a disadvantageous effect on easy stackability.

The reinforcement cage according to the invention of the type mentioned at the outset is characterized in that the longitudinal connecting rods - to enable easy stacking of at least three such reinforcement cages in a transverse direction - only at the two interfaces of the frame outline with a straight line passing through the center of gravity of the frame outline, or in the The immediate vicinity of these interfaces lies on the outside of the stirrups, with a polygonal stirrup outline leading this straight line at least through a corner area of the stirrup outline or through the immediate vicinity of this corner area, and if the longitudinal connecting rods are placed in the vicinity of the mentioned interfaces, these connecting rods are preferably arranged on both sides of the straight line.

The design according to the invention of a reinforcement cage of the type mentioned at the outset can very well meet the above-mentioned objective, and such reinforcement cages can be obtained at a production site remote from the construction site the devices for an economical and exact positioning and connection of the stirrups can be installed, manufactured in advance and transported a larger number of such reinforcement cages combined into a transport unit nested in a transverse direction to the construction site, so that the transport volume required for this transport by the packet-like combination of a number of reinforcement cages is relatively small. Due to the exact positioning of the brackets in relation to these reinforcement baskets, the assembly of such reinforcement baskets with the bars forming the longitudinal reinforcement at the construction site is considerably simplified and, at the same time, the accuracy of the structure of the reinforcements produced in this way and generally also the stability of the assembly of these reinforcements are improved .

The interfaces of the straight line passing through the center of gravity of the temple outline with the temple outline correspond to the points of contact of the temple outline with two mutually parallel straight lines which are applied to the outside of the temple outline and do not intersect the temple outline in the case of the practically important temple shapes.

With regard to the manufacture of the reinforcement cages and their handling, there are favorable conditions if the brackets are rectangular in shape and the longitudinal connecting rods are arranged on opposite sides of the rectangle at the beginning of the curvatures forming the corners of the brackets.

Another very simple embodiment of a reinforcement cage according to the invention, which is easy to manufacture and has very good stacking properties, is characterized in that the brackets are circular in shape and the longitudinal connecting rods only at the intersection points of the bracket outline with a straight line or in the immediate vicinity Are arranged near these intersections.

An advantageous further development of the reinforcement cage according to the invention provides that the brackets are formed by at least one helically bent rod, which successively embodies several brackets, with bending points and straight sections possibly also being provided in the course of the helical course. This development is particularly advantageous in terms of the manufacturing process and the cost of materials; in this embodiment, the separating work required to produce individual stirrups is eliminated, and the material expenditure required for individual stirrups to connect the two ends of the same is dispensed with, and, moreover, the operations required for joining the stirrup parts to the longitudinal connecting rods become processable individual bracket simplified, since the continuous spiral largely eliminates the need to align the bracket when processing individual brackets before assembly with the longitudinal connecting rods; due to the possibly provided in the course of the helical course of folding and straight portions of the coil, this can also in the manner of polygonally curved bracket, z. B. rectangular curved bow.

There are other materials for the longitudinal connecting rods in addition to steel, such as. As plastic, and techniques other than welding for connection to the bracket, such as. B. a connection using clamp connectors or sleeves, such a connection has the advantage that can be easily solved at any time if necessary, or a connection by gluing or soldering.

The reinforcement cages designed according to the invention can be produced in lengths which correspond to the length of the reinforcement to be produced in the respective application; but one can also provide reinforcements using several reinforcement cages which are successively joined together with the bars forming the longitudinal reinforcement of the reinforcement in question, if this, e.g. B. is considered advantageous for transport or organizational reasons; so you can z. B. Reinforcement cages in standard lengths and successively assemble several such reinforcement cages corresponding to the length of the reinforcements to be formed in the case in question with the bars forming the longitudinal reinforcement, with such a reinforcement cage each to form a certain predetermined overall length. The reinforcement must be shortened to a certain dimension to maintain the specified total length of the reinforcement cages joined together.

The invention will now be further explained with reference to examples which are shown schematically in the drawing.

• die Fig. 1 eine erste Ausführungsform eines erfindungsgemäßen Bewehrungskorbes in Schrägansicht, und
• die Fig. 2 und 3 zeigen diesen Bewehrungskorb in Seitenansicht und Stirnansicht ;
• Fig. 4 zeigt in Stirnansicht eine Armierung, die mit einem Bewehrungskorb nach den Fig. 1 bis 3 gebildet ist;
• Fig. 5 zeigt einen Stapel von nach den Fig. 1 bis 3 ausgebildeten Bewehrungskörben ;
• Fig. 6 zeigt in einem Ausschnitt einer Stirnansicht einen Stapel einer Variante zu der in den
• Fig. 1 bis 3 dargestellten Ausführungsform ; eine andere Ausführungsform eines erfindungsgemäßen Bewehrungskorbes ist in Fig. 7 in Stirnansicht dargestellt ;
• Fig. 8 zeigt, wieder in Stirnansicht, eine Ausführungsform eines Bewehrungskorbes, bei dem die Bügel einen kreisrunden Umriß aufweisen, und
  es zeigt Fig. 9 einen Stapel von Bewehrungskörben nach Fig. 8 ;
• die Fig. 10 und 11 zeigen eine Ausführungsform eines Bewehrungskorbes, bei der die Bügel durch einen wendelförmig gebogenen Stab gebildet sind, in Schrägansicht und in Seitenansicht;
• die Fig. 12 und 13 zeigen eine andere Ausführungsform eines Bewehrungskorbes, deren Bügel durch einen wendelförmigen Stab gebildet sind, in Schrägansicht und in Seitenansicht ;
• Fig. 14 zeigt in Stirnansicht einen Stapel von Bewehrungskörben, welche gemäß den Fig. 12 und 13 ausgebildet sind ;
• Fig. 15 zeigt einen Bewehrungskorb, dessen Bügel einen dreieckförmigen Umriß aufweisen, in Stirnansicht ;
• Fig. 16 zeigt das Bilden einer Armierung unter Aneinanderreihen mehrerer erfindungsgemäß ausgebildeter Bewehrungskörbe, die mit einer Längsbewehrung zusammengefügt werden.

In the drawing shows

• 1 shows a first embodiment of a reinforcement cage according to the invention in an oblique view, and
• Figures 2 and 3 show this reinforcement cage in side view and end view;
• Fig. 4 shows a front view of a reinforcement which is formed with a reinforcement cage according to Figures 1 to 3;
• FIG. 5 shows a stack of reinforcement cages designed according to FIGS. 1 to 3;
• FIG. 6 shows a section of an end view of a stack of a variant of the one in FIGS
• Figures 1 to 3 illustrated embodiment; another embodiment of a reinforcement cage according to the invention is shown in front view in FIG. 7;
• Fig. 8 shows, again in front view, an embodiment of a reinforcement cage in which the brackets have a circular outline, and
  FIG. 9 shows a stack of reinforcement cages according to FIG. 8;
• 10 and 11 show an embodiment of a reinforcement cage, in which the brackets are formed by a helically bent rod, in an oblique view and in a side view;
• 12 and 13 show another embodiment of a reinforcement cage, the brackets of which are formed by a helical rod, in an oblique view and in a side view;
• 14 shows a front view of a stack of reinforcement cages which are designed according to FIGS. 12 and 13;
• 15 shows a reinforcement cage, the brackets of which have a triangular outline, in front view;
• 16 shows the formation of a reinforcement by stringing together a plurality of reinforcement cages according to the invention, which are joined together with a longitudinal reinforcement.

The embodiment of a reinforcement cage shown in FIGS. 1 to 3 is formed from a number of brackets 1, which are connected to two longitudinal connecting rods 2. The brackets 1 extend in the circumferential direction over their full circumference and have a rectangular outline. The longitudinal connecting rods 2 are fixed to the brackets 1 and hold them in the mutual positions and spacings provided when using such a reinforcement cage to form a spatial reinforcement. To form a spatial reinforcement for reinforced concrete bodies, which reinforcement is particularly suitable for rod-shaped concrete components such as columns, Carrier, bored piles or the like comes into consideration, as shown in FIG. 4, a longitudinal reinforcement formed by rods 4 is arranged within the stirrups 1, whereby by connecting the rods 4 to the stirrups 1, the position of the longitudinal reinforcement provided in the reinforcement forming rods 4 is secured. This connection can e.g. B. be made with binding wire.

Due to the special position of the points at which the longitudinal connecting rods 2 are joined with the brackets 1, a number of such reinforcement cages can be pushed into one another in the transverse direction symbolized by arrows 5, forming a stack, as is shown in FIG. 5. In this way, the volume required for transport or storage of such reinforcement cages can be reduced significantly.

To enable this pushing into one another or stacking one into the other, the longitudinal connecting rods 2 are connected to the stirrups at those points on the contour of the stirrup which at the same time also touch the points of contact of two straight lines 6 which are parallel to one another and which are applied from the outside to the contour of the stirrups 1 and do not intersect the stirrup outline, form with the temple outline. These points of contact also correspond to the interfaces of a straight line 8 through the center of gravity 7 of the temple outline with the temple outline. If the longitudinal bars 2 are placed directly at the corner of the stirrups 1, as is provided in the variant according to FIG. 6, there is a particularly simple manipulation when pushing together a number of such reinforcement cages to form a stack when they push one another in the direction of the diagonal 11 the bracket should be done.

In the embodiment of a reinforcement cage shown in FIG. 7, the stirrups are realized by two rectangles forming a cross shape with one another. Even in the case of brackets shaped in this way, by suitably arranging the longitudinal connecting rods on the brackets, it is possible to achieve a stacking of several reinforcement cages formed with such brackets. For this purpose, the longitudinal connecting rods 2 are placed in the region of the contact points between two straight lines 6 which are parallel to one another and which are applied to the brackets 1 from the outside, with the outlines of these brackets; the course of the straight lines 6 which are parallel to one another is to be chosen such that they do not intersect the frame outlines at any point. The resulting points of contact also correspond to the interfaces of the straight line passing through the center of gravity 7 with the outline of the frame.

The embodiment of a reinforcement cage shown in front view in FIG. 8 is formed from circularly shaped brackets 1 and longitudinal connecting rods 2 which are attached to the outside of the brackets 1 at the geometric interfaces of the bracket with a straight line 15 in diameter. These interfaces also coincide with the points of contact of two straight lines 6 which are parallel to one another and which are applied from the outside to the frame outline and do not intersect the temple outline. This placement of the longitudinal connecting rods 2 on the brackets 1 of this reinforcement cage allows several such reinforcement cages to be pushed together in the transverse direction symbolized by the arrow 5 to form a densely packed stack, as is shown in FIG. 9.

In the embodiment of a reinforcement cage shown in FIGS. 10 and 11, the stirrups 1 are formed by successive zones of a helically bent rod 18, which successively embodies a plurality of stirrups 1. The individual zones of the rod 18, which embody the brackets 1, are held relative to one another by the longitudinal connecting rods 2, which are connected to the zones of the rod 18 forming the brackets 1. If desired, it is also possible to provide a plurality of rods 18 which are placed in an interlocking manner in the manner of multi-start threads. It is also possible to vary the pitch of the helix in sections in order to arrange the individual brackets 1 in different parts of the longitudinal extension of the reinforcement cage at different distances from one another.

The formation of the brackets of the reinforcement cage by a helically bent rod can also be varied in such a way that 18 folding points 20 are provided in the course of the helical course of such a rod, wherein the sections 21 extending between such folding points 20 can either be curved or even straight, as is the case with the embodiment according to FIGS. 12 and 13. This embodiment corresponds in terms of the shape of the brackets 1 formed by successive sections of the coiled rod 18 to a reinforcement cage with polygonally shaped brackets. With regard to the attachment of the longitudinal connecting rods 2 to the brackets 1 formed by successive sections of the coiled rod 18 and the properties resulting from the choice of the attachment points with regard to the pushing together and stacking of several such reinforcement baskets, practically the same conditions are present as already described above with reference to others Embodiments with polygonal brackets has been discussed. This can also be seen directly from FIG. 14, in which an interleaved stack of several reinforcement baskets, which are designed according to FIGS. 12 and 13, is shown in a front view.

In the embodiment of a reinforcement cage shown in a front view in FIG. 15, odd-numbered polygonal, namely triangular, brackets 1 are provided, and a longitudinal connecting rod 2a is arranged in the area of a bracket corner 22 and a second longitudinal connecting rod 2b on the triangular side 23 opposite this bracket corner 22 . Again, the criterion is met that the longitudinal connecting rods 2a, 2b are placed in the area of the contact points of the temple outline with parallel straight lines 6, which are applied to the outside of the temple outline and do not intersect the temple outline, and these contact points correspond to the Interfaces of a straight line 8 passing through the center of gravity 7 with the bow outline.

The formation of reinforcements using a plurality of reinforcement cages lined up in a row is shown schematically in FIG. 16. There are several reinforcement cages 25, 26 joined together with the longitudinal reinforcement of the reinforcement formed by bars 4. The reinforcement cages, which in turn, as discussed in connection with the preceding embodiments, are formed from brackets 1 and longitudinal connecting rods 2, can have standardized lengths 27, 28, these lengths both from the point of view of being as universal as possible and from the point of view of in the manufacturing given options and from the point of view of transport options can be chosen. From the point of view of universal usability, it can be mentioned that a suitable choice of the length of the reinforcement cages can be used to produce a wide range of reinforcement cages of different lengths with a view to the intended arrangement of several such reinforcement cages, and thus without custom-made reinforcement cages tailored to the dimensions of the reinforcement to be produced can get by, which can further reduce the overall manufacturing costs. In order to be able to coat a narrowly graduated scale of length dimensions of the spatial reinforcements to be produced, the prefabricated reinforcement cages can also be provided in different standard lengths 27, 28 and, if necessary, reinforcement cages 25, 26 which have different length dimensions for producing the spatial reinforcement to be formed in each case. bring them together as shown in Fig. 16. However, if required, reinforcement cages with standard lengths can be produced without difficulty by appropriately separating the longitudinal connecting rods, which then together with other reinforcement cages result in the required length. To form different distances between the brackets 1 of the reinforcement to be produced, a corresponding determination can be made in the manufacture of the reinforcement cages; there is also the possibility of influencing the size of the distances between the brackets 1 present in the reinforcement by appropriately selecting the distances 29 between the reinforcement cages 25, 26 lined up to form the spatial reinforcement.

Claims (6)

1. A reinforcing cage for three-dimensional reinforcements for reinforced concrete members, more particularly for reinforcements in cage formfor reinforced concrete structural components in bar or rod form, such as columns, beams, drilled foundation piles or the like, which reinforcing cage is formed from stirrups (1) extending peripherally so as to be closed over the entire periphery and is adapted to be joined to a longitudinal reinforcement which is formed by rods (4) and together with which it forms the reinforcement, the stirrups (1) which form the reinforcing cage being interconnected by two longitudinally extending connecting rods (2) disposed on the outside of the stirrups, and being held in the mutual stirrup spacing provided for the three-dimensional reinforcement, the connecting rods (2) consisting more particularly of steel and being welded to the stirrups (1), characterised in that for the purpose of allowing easy stacking of at least three such reinforcing cages one inside the other in a transverse direction the longitudinally extending connecting rods (2) are situated in each case only at the two points of intersection of the stirrup contour and a straight line (8) passing through the centre of gravity (7) of the stirrup contour or in the immediate vicinity of these points of intersection at the outside of the stirrups (1), said straight line extending - in the case of a polygonal stirrup contour - at least through a comer zone of the stirrup contour or through the immediate vicinity of said corner zone, and, in the case of the longitudinally extending connecting rods (1) being disposed in the vicinity of the said points of intersection, said connecting rods are preferably disposed on both sides of the straight line (8).

2. A reinforcing cage according to claim 1, characterised in that the stirrups (1) are of rectangular shape and the longitudinally extending connecting rods (2) are disposed on opposite sides of the rectangle at the start of the curvatures forming the corners of the stirrups.

3. A reinforcing cage according to claim 1, characterised in that the stirrups (1) are of circular shape and the longitudinally extending connecting rods (2) are disposed only at or in the immediate vicinity of the points of intersection of the stirrup contour and a diametric straight line.

4. A reinforcing cage according to claim 1, characterised in that the stirrups (1) are of polygonal shape with an odd number of sides, more particularly of triangular shape, and a longitudinally extending connecting rod (2a) is disposed in the zone of one stirrup corner (22) and another longitudinally extending connecting rod (2b) is disposed at a side (23) of the polygon situated opposite said stirrup corner.

5. A reinforcing cage according to any one of claims 1 to 4, characterised in that the stirrups (1) are formed by at least one rod (18) which is bent into the form of a helix and which embodies a plurality of stirrups successively, bend locations (20) and straight portions (21) being provided if required in the course of the helical configuration.

6. A reinforcing cage according to any one of claims 1 to 5, characterised in that the connecting rods are connected to the stirrups by clamp connectors.

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