EP0808960A1 - Prefabricated reinforcing cage - Google Patents

Abstract

The cage consists of one or more nets (N1), and joins the reinforcing material in a floor plate (P) to that in a wall (W) under pressure. Parallel cross-bars (1) at regular intervals are joined together at one end by a lengthwise one (4). Midway between adjacent cross-bars are additional ones (2) joined at one end to the lengthwise one. All the cross-bars are bent upwards through 90 degrees along a common line (B1), while only the additional ones are also bent along a second line (B2) into a U-shape. All the first and additional cross-bars (1,2) near the outside of the wall are joined together by an additional lengthwise one (5) parallel and close to the first one. A further lengthwise bar (3) is situated near the first bend line, so that all the lengthwise bars are roughly in a common plane. The first cross-bars can extend beyond the additional ones, their ends being joined together by a lengthwise stiffening bar.

Description

Traditionally, reinforcement baskets are often installed on the building site at the place of installation by the iron layer with binding baskets. This is extremely labor-intensive, but has the advantage that the armouring basket can be easily adapted to the respective, building-specific conditions. In the multitude of different applications of reinforcement baskets, prefabricated reinforcement baskets must be carefully thought out in order to be as versatile as possible in spite of their predetermined and thus restricting their use.

In architecture, people are increasingly trying to build creatively. The creative elements in the building industry also include round or curved concrete walls. However, because of the extraordinarily time-consuming and costly manual work involved, people have usually rebelled against round components. Prefabricated reinforcement baskets for these applications were hardly known.

Such a connection between a floor-ceiling plate and a wall running perpendicular thereto was made in different ways. One way was to pull the reinforcement bars of the flat net over the angular area between the wall to be created and the transition to the floor-ceiling slab and to bend it through 90 ° at the right place. This inevitably required a two-step procedure for casting concrete. Accordingly, the formwork can only be created step by step. The bending of the reinforcing bars is cumbersome and often inaccurate. The second method was to use pre-fabricated reinforcement baskets. Here reinforcement bars bent at right angles, which are connected to each other in the corner area with a longitudinal bar, can be used. Such reinforcement baskets are known from FR-A-2 422 782 or EP-A-0 136 283. The legs of the bars bent at right angles are connected by tying flat nets to the wall and / or floor-ceiling slab. The disadvantage of this solution can be seen in the fact that relatively little work is done for the iron layer. The reinforcement network described offers little help, in particular when creating a floor-to-ceiling slab, which usually has upper and lower reinforcement. It was hardly possible to connect a floor-to-ceiling slab to a curved or curved wall with such reinforcement baskets. If you bend the longitudinal bar, which connects the reinforcing bars bent at right angles to each other, it twists. The legs of the right angle bent reinforcing bars will then point in all directions. The next step was to align all of the legs by hand. A labor saving was therefore not achieved.

From EP-A-0 267 146 a reinforcing basket for creating a connection between the reinforcements of a floor-ceiling slab and a wall is also known, which consists of a number of long, parallel, equally spaced, right-angled crossbars, the leg ends of each through a longitudinal rod are connected to one another, and from short transverse rods which are bent at right angles and arranged at least approximately centrally between these long transverse rods. The one, short leg of the short crossbars runs in the plane of one of the legs of the long crossbar, while the longer leg of the short crossbar is arranged parallel to the other leg of the longer crossbar. Such an element is versatile and easy to connect to the flat nets in the floor-ceiling tiles and in the adjoining wall. The element is extremely torsion-resistant and is only suitable for connecting the floor-ceiling slab to a straight wall.

A further development of this is shown in EP-A-0 421 925 with the features of the preamble of patent claim 1. This prefabricated reinforcement cage is particularly suitable for the connection between a ceiling plate and one curved wall. However, especially in the most common areas of application, namely in the case of curved, pressure-loaded walls, such as occur, for example, in the entrances to underground car parks, the solution mentioned has only been partially accepted. With these solutions in particular, it was necessary to manufacture at least the long, L-shaped cross bars with a larger diameter in order to be able to achieve the required iron cross-section per linear meter. As a result, these were again custom-made products that are correspondingly expensive.

Furthermore, in these applications it is often desirable to pull the base plate beyond the area of the support wall so that a base plate is created on the outside. However, this could not be achieved with the known solution according to EP-A-0 421 925. The longitudinal bars required for the required strength did not allow a second net to be pushed through the first net which formed the reinforcement cage.

It is therefore the object of the present invention to change a prefabricated reinforcement cage of the type mentioned at the outset in such a way that it is particularly suitable for connecting the reinforcements of a base plate and a pressure-loaded wall.

This task is solved by a prefabricated reinforcement cage with the Features of claim 1.

If you attach the second longitudinal bar at least approximately at the level of the bent ends of the additional cross bars, you get a reinforcement basket that is particularly suitable for being connected to various other reinforcement nets for the upper armouring in the base plate, since this netting can then be used Insert the additional crossbars between the two parallel legs at the top and then tilt. In a configuration of the reinforcement cage according to the invention, a base plate can be realized which has a base plate base protruding towards the pressure side.

If the prefabricated reinforcement cage is designed with the features of claims 2 and 5, such a base plate can also be realized with a straight wall.

In order to be able to manufacture as many similar reinforcement baskets as possible in production, it is also possible to realize the reinforcement bars with the features of claim 2 and to change only those reinforcement baskets that are used with a curved wall profile so that the extended ends of the Crossbar connecting longitudinal rod between two crossbars is severed. Of course, such a reinforcement cage can also be used as just described combine with an additional reinforcement net to be able to manufacture a base plate base protruding towards the pressure side.

The prefabricated reinforcement cage according to the invention can advantageously be produced from cross and additional cross bars, all of which have the same diameter. This diameter is usually 7 mm. In certain cases, however, the reinforcement cage can also be made from cross bars with a diameter of preferably 7 mm and from additional cross bars with a diameter of preferably 7.5 mm. This again results in an increased iron cross-section per linear meter, although the production system does not have to be converted because the welding times in particular can be maintained.

Finally, it makes sense to choose the diameter of the longitudinal bars smaller than the diameter of the transverse or additional transverse bars. This facilitates the formal adaptation of the reinforcement cage to the curvature to be installed.

Figur 1 -

die Grundform eines Armierungsnetzes zur Erstellung des erfindungsgemässen Armierungskorbes und

Figur 2 -

dessen Anwendung zur Erstellung der Verbindung zwischen den Armierungen einer Bodenplatte und einer druckbelasteten Wand, wobei die Bodenplatte einen druckseitig vorstehenden Bodenplattensockel aufweist.

Figur 3 -

zeigt ein modifiziertes Armierungsnetz und

Figur 4 -

dessen Anwendung in einem entsprechenden Fall wie in Figur 2.

Figur 5 -

zeigt ein nochmals leicht geändertes Armierungsnetz, wie es zur Erstellung einer Verbindung zwischen den Armierungen einer Bodenplatte und einer gerade verlaufenden, druckbelasteten Wand zum Einsatz kommt, sowie

Figur 6 -

wiederum dessen Einsatz am Bauwerk.

Figur 7 -

zeigt den erfindungsgemässen Armierungskorb in einem Schnitt senkrecht zur Längsrichtung der Längsstäbe für sich allein.

Figur 8 -

zeigt zwei weitere Alternativen zur Formung des Armierungskorbes.

In the attached drawing, the preferred embodiments of the subject matter of the invention are shown and explained with reference to the following description. It shows:

Figure 1 -

the basic form of a reinforcement network for creating the reinforcement basket according to the invention and

Figure 2 -

its use to create the connection between the reinforcements of a floor slab and a pressure-loaded wall, the floor slab having a base plate base protruding on the pressure side.

Figure 3 -

shows a modified reinforcement network and

Figure 4 -

its application in a corresponding case as in FIG. 2.

Figure 5 -

shows another slightly modified reinforcement network, how it is used to create a connection between the reinforcements of a floor slab and a straight, pressure-loaded wall, and

Figure 6 -

again its use on the building.

Figure 7 -

shows the reinforcement cage according to the invention in a section perpendicular to the longitudinal direction of the longitudinal bars by itself.

Figure 8 -

shows two other alternatives for forming the reinforcement cage.

FIG. 1 shows the unbent network for creating the reinforcement cage according to the invention. It consists of a number of parallel crossbars 1 arranged at equal intervals and of equal length, additional crossbars 2 arranged centrally between two adjacent crossbars. 4.5 connected. A first longitudinal rod 4 connects the end ends of all the transverse rods 1 and all the additional transverse rods 2. An additional longitudinal rod 5 runs parallel to the first longitudinal rod 4 at a slight distance from it and in turn connects all the transverse rods 1 and all the additional transverse rods 2. Approximately in the middle with respect to the longitudinal extent of the transverse rods 1 and additional cross bars 2, a further longitudinal bar 3 is arranged, which in turn is welded together with all cross bars and all additional cross bars. The entire first reinforcement network N ₁ thus consists of n cross bars 1 and n-1 additional cross bars 2 and a total of three longitudinal bars 3, 4, 5.

This network N ₁ is formed by two bends in the reinforcement cage according to the invention. The first bend takes place along the bending line B ₁ , which approximately coincides with the central longitudinal bar 3. This bending line B ₁ preferably runs between the two longitudinal bars 3 and 5, but as close as possible to the longitudinal bar 3 arranged approximately centrally with respect to the length of the transverse bars. When bending around the first one Bending line B ₁ , all cross bars 1 and all additional cross bars 2 are bent around this bending line by 90 °. A second bending line B ₂ runs parallel to the first bending line B ₁ , the two bending lines correspondingly running the distance of the outer reinforcement and inner reinforcement of a wall W. In a second bend around the bending line B ₂ , only the additional transverse rods are bent again by 90 ° in the same direction. Consequently, in the finished reinforcement cage, the cross bars 1 are L-shaped and the additional cross bars 2 are U-shaped. The two outer longitudinal bars 4 and 5, which run relatively close to one another, thus run in the outer reinforcement of the wall W to be created. The third longitudinal bar 3 lies perpendicularly below the two longitudinal bars 4 and 5, but in the base plate P. In the side view, the finished bent thus forms Reinforcement basket about an F-shaped structure. It is essential that all longitudinal bars 3, 4, 5 are vertically one above the other in the finished reinforcement cage. These vertical bars arranged one above the other now define a plane, namely the plane of curvature K ₁ . The finished reinforcement cage according to the invention can now be laid in the plane of curvature K _1, curved inwards or outwards. Because, in addition, only a single longitudinal bar 3 is present in the floor-to-ceiling slab P to be created, and this is arranged at the level of the lower reinforcement to be installed in the floor-to-ceiling slab, the reinforcement cage according to the invention can be combined with a further reinforcement network N ₂ almost as desired . This freedom of combination is increased by attaching the additional longitudinal rod 5, which runs close to the terminally arranged longitudinal rod 4, in such a way that it is arranged approximately at the level of the ends of the additional transverse rods 2 bent upward when the reinforcement cage is bent. As a result, almost any additional reinforcement network N ₂ can be inserted into the reinforcement cage of the invention that has already been laid.

While maintaining the inventive concept and the advantages according to the invention, it is of course also possible to bend all cross bars 1 and additional cross bars 2 by a B ₃ or two further bending lines into a shape according to FIG. 8. Such a reinforcement cage makes it easier, in particular, to connect a subsequent flat network that can be easily attached.

Such a combination, also according to the invention, is shown in FIG. Here, the F-shaped reinforcement cage consisting of the cross bars 1, the additional cross bars 2 and the longitudinal bars 3, 4 and 5 is laid so that the parallel legs of the U-shaped bent cross bars 2 project vertically upwards and one for connecting networks to be laid outer and inner reinforcement in the wall W are provided. One leg of the L-shaped curved crossbars 1 runs at the level of the lower reinforcement to be installed in the floor-ceiling plate P. The reinforcement basket according to the invention is here with a second reinforcement basket, consisting of the reinforcement network N ₂ combined. This reinforcement network N ₂ consists of a plurality of U-shaped brackets with two parallel legs 11, 12 of equal length, which are connected to one another via a vertical connecting section 15. The upper legs 11 of the U-shaped bracket in the installed state are connected to one another via a longitudinal connecting rod 14, while the lower parallel legs 12 in the installed state are connected to one another with a connecting rod 13 running in the longitudinal direction. Both connecting rods 13, 14 are arranged exactly vertically one above the other and together define a second plane of curvature K ₂ . This plane of curvature K ₂ runs parallel and at a distance from the first plane of curvature K _{1 of} the reinforcement cage according to the invention. The reinforcing mesh N ₂ can thus be adapted to any curvature of the reinforcing cage. The reinforcement net N ₂ can easily penetrate the reinforcement basket in the area of the floor-ceiling slab. Consequently, the floor-ceiling plate P can now be formed with a base S projecting on the pressure-loaded side of the wall W. Such a design has so far not been possible with known prefabricated reinforcement baskets, regardless of whether the pressure-loaded wall W was straight or curved.

FIG. 3 shows a variant of the reinforcement cage according to FIGS. 1 and 2. In contrast to the previously described embodiment, the cross bars 1 and the additional cross bars 2 are no longer of the same length. The elongated cross bars 1 'protrude from the additional cross bars 2 by a certain distance. These protruding ends of the elongated cross bars 1 'are connected to one another by a longitudinal bar, the longitudinal bar being cut in each case between two parallel adjacent elongated cross bars 1'. Each elongated crossbar end is provided with a longitudinal bar section 6. These longitudinal rod sections 6 result in improved anchoring in the floor-ceiling plate P. They are also particularly suitable for attaching reinforcement mats for the lower reinforcement in the floor-ceiling plate. With this variant, too, the reinforcement cage according to the invention can be used both for curved and straight pressure-loaded walls. Reinforcement nets N ₂ can also be attached here, which are suitable for molding a base S projecting on the pressure side to the floor-ceiling plate P.

Ultimately, a third embodiment of the reinforcing cage according to the invention is shown in FIGS. 5 and 6, in which case elongated cross bars 1 'are used which project on one side over the additional cross bars 2. In the same way as in the embodiment according to FIGS. 3 and 4, the elongated ends of the elongated cross bars 1 'are in turn connected to one another by a longitudinal bar 7, the so-called stiffening iron. Since the longitudinal bar is not cut here, it has the function of a stiffening iron, which means that this reinforcement cage is only used to create straight ones walls under pressure. Here too, the reinforcement cage can be combined with a second reinforcement net N ₂ . In contrast to the previously described reinforcement nets N ₂ , this is not only provided with a connecting rod on the lower or on the upper parallel legs of the U-shaped network, but a large number of connecting rods 17 are provided. This makes it easier to connect corresponding flat networks of the same size. Thanks to the fact that the second additional longitudinal bar 5 is arranged approximately at the level of the ends of the shorter legs of the U-shaped additional transverse bars, this connecting network N _{2 can} be connected to the reinforcement cage according to the invention in such a way that one or more connecting bars 16 extend into the area between the two parallel legs of the U-shaped additional cross bars 2 come to rest. In this way, a base S on the pressurized side of the wall can also be attached to the floor-ceiling plate P above.

In a preferred embodiment of the reinforcement cages according to the invention, all cross bars and all additional cross bars will be dimensioned the same. You can preferably go down to a diameter of 7 mm. This allows a greater density of parallel irons compared to known networks. This allows a particularly efficient production compared to known networks, where one worked with crossbars when used in pressure-loaded walls, which considerably had a larger cross-section, namely about 12 to 14 mm. Compared to the solution according to the invention, this means a considerably longer welding time. The reinforcement ratio between the outer reinforcement and the inner reinforcement is also optimal in the solution according to the invention. In this way, with a reinforcement section of 870 mm length, a reinforcement cross-section of 552 mm ² / m on the outside and a specific reinforcement of 295 mm ² / linear meter on the inside reinforcement are achieved. If you want to increase the reinforcement on the outside again, you can also slightly increase the cross-bars 1 in cross-section to a diameter of 7.5 mm, without this causing welding problems. In principle, one is free to choose the diameter of the longitudinal bars 3, 4, 5. In order to achieve good workmanship, however, the diameter will be selected approximately in the range of the diameter of the cross bars or additional cross bars, or somewhat less. In particular, for reinforcement baskets according to the invention which are laid in a curved manner, the diameter of the longitudinal bars is selected to be thinner than the diameter of the transverse bars and additional transverse bars, preferably a diameter of approximately 5 mm. This choice is necessary in order to achieve sufficient strength and, on the other hand, usable flexibility in order to adapt the reinforcement cage to the curvature of the wall to be created.

Claims (10)

Prefabricated reinforcement basket made from at least one network (N ₁ ) to create a connection between the reinforcements of a base plate (P) and a pressure-loaded wall (W), consisting of a number of parallel bars (1,1 ') arranged in parallel at equal intervals are connected to one another at one end by an at least approximately terminally arranged longitudinal rod (4), and from approximately centrally between each two adjacent transverse rods (1, 1 ') parallel to these additional transverse rods (2), which are connected on one side to the longitudinal rod (4) are, and wherein all cross bars (1, 1 ') and additional cross bars (2) are bent upwards by 90 ° about a first common bending line (B ₁ ) and only the additional cross bars (2) are spaced parallel to the first bending line (B ₁ ) a second bending line (B ₂ ) are bent in a U-shape, characterized in that all the cross bars (1) and additive to be located on the outside of the pressure-loaded wall (W) transverse bars (2) are connected to one another in parallel relatively close to the terminally arranged longitudinal bar (4) by at least one second longitudinal bar (5) and a further longitudinal bar (3) is arranged in the area near the first bending line (B ₁ ), so that all longitudinal bars ( 3,4,5) lie at least approximately in one plane (K ₁ ). Prefabricated reinforcement cage according to claim 1, characterized in that the cross bars (1 ') are extended on one side over the length of the additional cross bars (2) and the extended ends are connected to one another by an additional longitudinal bar as stiffening bars (7). Prefabricated reinforcement cage according to claim 1, characterized in that the second longitudinal bar (5) extends at least approximately at the level of the bent ends of the additional transverse bars (2). Prefabricated reinforcement cage according to claim 1, characterized in that it serves to create a pressure-loaded, curved wall (W) with a base plate base (S) protruding towards the pressure side and is loosely connected to a second network (N ₂ ), the second network ( N ₂ ) consists of sheer U-shaped parallel rods, the parallel legs (11, 12) of which are each connected to a connecting rod (13, 14), the two connecting rods (13, 14) lying at least approximately vertically one above the other (K ₂ ) and thus have the same radius of curvature in the bent state. Prefabricated reinforcement cage according to claim 2, characterized in that it is used to create a pressure-loaded, straight wall (W) with a The base plate base (S) projecting from the pressure side is loosely connected to a second network (N ₂ ), the second network (N ₂ ) consisting of nothing but U-shaped brackets, the parallel legs of which are each connected to one another by a plurality of parallel connecting rods (16) . Prefabricated reinforcement cage according to claim 2, characterized in that the longitudinal rod connecting the elongated ends of the transverse rods (1 ') to each other is cut between two transverse rods (1') to form longitudinal rod sections (6). Prefabricated reinforcement cage according to claim 6, characterized in that it serves to create a pressure-loaded, curved wall (W) with a base plate base (S) protruding towards the pressure side and is loosely connected to a second network (N ₂ ), the second network ( N ₂ ) consists of sheer U-shaped parallel rods, the parallel legs (11, 12) of which are each connected to a connecting rod (13, 14), the two connecting rods (13, 14) lying at least approximately vertically one above the other (K ₂ ) and thus have the same radius of curvature in the bent state. Prefabricated reinforcement cage according to claim 1, characterized in that all cross (1) and additional cross bars (2) have the same diameter. Prefabricated reinforcement cage according to claim 1, characterized in that the cross bars (1) have a diameter of preferably 7 mm and the additional cross bars (2) have a diameter of preferably 8.5 mm. Prefabricated reinforcement cage according to claim 1, characterized in that the diameter of the longitudinal bars (3,4,5) is smaller than the diameter of the transverse or additional transverse bars (1,2).

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