EP0421925B1 - Reinforcing cage - Google Patents

Abstract

The cage serves to provide a connection between the reinforcements of a floor slab (P) and a wall (W). It consists of a multiplicity of alternately long transverse bars (1) bent in an L-shape and short transverse bars (2) bent in a U-shape. Each leg (11) of each L-shaped transverse bar (1) and each leg (21) of each transverse bar (2) bent in a U-shape lie in a common plane (E1). The reinforcing cage has at least one region which is capable of bending in its longitudinal direction and in which all transverse bars (1 and 2) are joined to one another only by longitudinal bars (3-6) lying in a first plane (E1). If the reinforcing cage is laid and the bendable region correspondingly curved, the extensions of the free legs (10) point towards the centre of the bending curve. <IMAGE>

Description

In the professional world, reinforcement nets are not only understood to be flat structures, but more generally three-dimensional structures formed from such networks by means of bends. For the sake of clarity, however, the term reinforcement cage is also used. Conventionally, such a reinforcement cage is often formed on the building site at the place of installation and tied with special wires. This is extremely labor-intensive, but has the advantage that the reinforcement cage can be easily adapted to the particular building-specific circumstances. In the multitude of different uses of reinforcement baskets, prefabricated reinforcement baskets must therefore be carefully thought out so that they can be used in as many different ways as possible despite their specified shape and thus their use.

In architecture, people are increasingly trying again today build creatively. The creative elements in the construction industry also include round, respectively curved concrete walls. Because of the extraordinary time-consuming and cost-intensive manual work that was associated with this, however, people have usually rebelled against round components. Prefabricated reinforcement baskets for this application were previously unknown. The present invention provides a reinforcing cage for creating the connection between a floor slab and a round or arched wall standing vertically thereon.

Such a connection between a floor slab and a wall perpendicular to it is made in various ways today. One way is that the reinforcement bars of the flat net are pulled out beyond the angular area between the wall to be created and the transition to the floor slab and bent in the right place by 90 degrees. This inevitably requires a two-step process 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 is 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 cross bar. 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 binding to flat nets on the wall and / or floor slab. The main disadvantage of this solution is that the ironlayer takes up relatively little work. The reinforcement network described offers little help, in particular when creating a floor slab, which usually has an upper and a lower armouring. The use for connecting a floor slab to a curved or curved wall can hardly be achieved with such reinforcement baskets. If you bend the crossbar that connects the reinforcement bars bent at right angles, it twists. The legs of the reinforcement bars bent at right angles will then point in all directions. As a next step, you would have to straighten all the legs by hand. There is therefore no labor saving.

From EP-A-0'267'146 a reinforcing basket for creating a connection between the reinforcements of a floor slab and a wall is known, in which the basket consist of a number of long, parallel, equally spaced, right-angled transverse bars, the ends of which are each connected to one another by a longitudinal bar, such as from right-angled, short short bars arranged at least approximately centrally between these long transverse bars. 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 can be used in a variety of ways and is easily connectable to the flat nets in the floor slab as well as in the wall to be connected. The element is extremely rigid and is only suitable for connecting the floor slab to a straight wall.

The present invention has for its object to improve such a versatile element so that it is also suitable for creating the connection of a floor slab with a curved or curved wall running perpendicular to it.

This problem is solved by a prefabricated reinforcement cage with the features of patent claim 1. Further advantageous embodiments emerge from the dependent claims.

Figur 1

einen Querschnitt durch einen Armierungskorb im biegbaren Bereich;

Figur 2

einen Schweiss- und Biegeplan eines Armierungsnetzes zur Erstellung einer Ausführungsform des erfindungsgemässen Armierungskorbes;

Figur 3, 4 und 5

drei weitere Varianten von Schweiss- und Biegepläne entsprechend Figur 2;

Figur 6

einen Verlegungsplan eines Armierungskorbes der dem Schweissplan nach Figur 2 entspricht und

Figur 7

einen solchen Verlegungsplan der einem Armierungskorb entsprechend der Variante nach Figur 4 entspricht.

In the attached drawing, a preferred embodiment of the subject matter of the invention is shown per se and in use. It shows:

Figure 1

a cross section through a reinforcement cage in the bendable area;

Figure 2

a welding and bending plan of a reinforcement network to create an embodiment of the reinforcement cage according to the invention;

Figures 3, 4 and 5

three further variants of welding and bending plans according to Figure 2;

Figure 6

a laying plan of a reinforcement cage which corresponds to the welding plan according to Figure 2 and

Figure 7

such a laying plan which corresponds to a reinforcement cage corresponding to the variant according to FIG. 4.

1 shows the prefabricated reinforcement cage according to the invention in the position of use in the connection area between a floor slab and a wall. The floor cover plate P is flat as usual. The adjoining wall W, which is perpendicular to the floor slab, is curved. However, this is not evident in the sectional view. The flat reinforcement nets adjoining the element have been left out in order not to stress the drawing too much. The floor cover plate P usually has two layers of flat reinforcement nets arranged one above the other. Depending on the thickness of the wall, the wall W standing vertically thereon only has a correspondingly curved flat reinforcement network or, in the case of greater thickness, two reinforcement networks running parallel to one another, similar to the floor cover plate.

The reinforcement cage according to the invention essentially consists of two differently curved, differently long, but parallel to each other transverse bars and connecting longitudinal rods to each other. The long crossbar 1, which is closer to the cutting plane, is initially visible. It is bent in an L-shape and has a leg 10 which comes to rest in the floor cover plate P when the element is installed. The other, perpendicular to the leg 10 leg 11 is in the installed position of the element in the wall W. A shorter cross bar 2 is arranged in front of it in relation to the plane of the drawing. It is bent in a U-shape and lies with respect to the former long crossbar 1 in such a way that one leg 21 is directly aligned with the leg 11 of the long crossbar. The second free leg 22 running parallel to the first is clearly visible. The connecting piece between the two legs 21 and 22 lies in a plane E2 in alignment with the legs 10 of the long crossbar in the floor slab. A prefabricated reinforcement cage consists of a large number of long, L-shaped cross bars alternating with shorter, U-shaped cross bars 2. The legs 11 of the long cross bars and the legs 21 of the short cross bars lie in a common plane E1. All of the legs 11 and 21 lying in this plane E1 are connected to one another by at least two, in the example shown, however three longitudinal bars 3, 4, 5. The thigh 21 of the shorter cross bars 2 are shorter than the legs 11 of the long cross bars 1. This can be seen clearly from the welding and bending plans to be described below. Although two longitudinal bars 3 and 4 or 3 and 5 would already suffice for the formation of the reinforcement cage according to the invention, three longitudinal bars are preferably used, since this results in a greater torsional stiffness of the reinforcement cage. This can be further improved by welding a fourth longitudinal rod 6 to the free ends of the legs 11 of the long transverse rods 1, which lie in the plane E1. At the same time, this longitudinal bar 6 can be used for the additional connection to a flat reinforcement network in the wall W. All longitudinal bars 3-6 run parallel to each other. The lowermost longitudinal rod 3 is welded on to the lowest end of the legs 11 or 21 in the vicinity of the bend, if possible. This also transfers the strength to the free legs 10 of the L-shaped long crossbars and also to the legs 22 of the short crossbars 2. The two longitudinal bars 4 and 5, which are arranged somewhat further away from the bend, are approximately 5-20 cm perpendicularly above the legs 10 of the long crossbars welded on at a distance. Their arrangement is chosen so that both longitudinal bars are still in the area of the floor slab.

You can use it as an aid when installing the upper reinforcement in the floor slab during installation. However, the network of the upper reinforcement is fastened to the free legs 22 of the short cross bars 2 which are directed vertically upwards. Since these legs 21 are not connected to one another by longitudinal bars, the reinforcement nets can be introduced onto them from above.

Since all longitudinal connecting rods 3-6 lie in one plane, the reinforcement cage can be deformed out of plane E1 when laying in accordance with the desired curvature of the wall to be created. This desired deformation of the reinforcement cage can take place on the construction site itself or can already be carried out in the production plant.

The welding and bending plans shown in FIGS. 2, 3 and 4 illustrate what has been predicted. Here you can clearly see the long cross bars 1 and the alternately arranged short cross bars 2, which all run parallel to one another. The two bending lines m and b are drawn in dashed lines in the drawing, both of which run parallel to the longitudinal bars. The first bending line runs approximately in the middle of the length of the long cross bars 1 m around which all cross bars 1 and 2 are bent by 90 degrees. The second bending line b extends at a relatively short distance therefrom, by which only the short transverse bars 2 are bent upward again by 90 degrees. As a result, all the longitudinal bars 3, 4 and 5 and 6 come to the right of the bending line m into one plane, the plane E1 already described. This also applies to the legs 11 and 21 of the corresponding cross bars. The longer legs 22 of the short cross bars 2, on the other hand, lie in a parallel plane spaced apart from this, which is not further designated. The second halves of the long cross bars 1, however, come to lie in a plane E2 running perpendicular to plane E1. The welding and victory plan according to FIG. 2 serves to manufacture a reinforcing cage which has a non-bendable area A and a bendable area B. In the bendable area B, the legs 10 of the long cross bars 1 are not connected to one another. In the non-bendable area A, however, there is a stiffening longitudinal bar 7, which is welded to the ends of the legs 10, the L-shaped long cross bars 1. The legs 10 of the long crossbars 1 with the two longitudinal bars 3 and 7 thus form a warp-resistant network in the plane E2, while the legs 11 running perpendicularly thereto by means of the longitudinal bars 3-6 again form a warp-resistant network, which lies in level E1. In the embodiment according to FIG. 2, the reinforcement cage is divided in the longitudinal direction into two areas, one of which is relatively rigid and torsionally rigid, and the other half forms the bendable area. In contrast, FIG. 4 shows an embodiment in which the bendable region B forms an intermediate piece of the entire reinforcement cage. This area is followed by a relatively rigid, torsionally rigid area A 'or A''on both sides. The bendable areas according to these versions are particularly suitable for tight bending radii of at least 1m. The embodiment according to FIG. 5 differs only in that the bendable region extends below the entire network.

FIG. 3 shows a welding and bending plan of a reinforcement cage which can be bent over its entire length. However, it is less flexible. With such reinforcement baskets, bending radii up to a minimum of 2m can be formed. Its use is shown in FIG. 6, which shows a laying plan for such an element. The special thing about the reinforcement cage according to FIG. 3 is that each of the legs two L-shaped adjacent cross bars 10 are each interconnected by means of bar sections. This gives the entire reinforcement cage increased strength, but limits the bendability of the cage. Such a reinforcement cage is therefore only suitable for forming larger radii. This is particularly common in silo construction. In production, the procedure is such that first a longitudinal rod is welded on, which connects all the legs 10 to one another, and then the necessary cutouts are cut out, so that the rod sections 8 form.

The laying plan according to FIG. 7 shows the use of a reinforcement cage according to the welding. and the bending plan according to FIG. 3 has been produced.

Claims (4)

1. Prefabricated reinforcing cage for establishing a connection between the reinforcement of a floor-ceiling-slab (P) and a wall(W), said cage comprising lengthwise a plurality of long transverse rods (1) bent in L-form being arranged in alternating order with short transverse rods (2) bent in U-form in such a way that one leg (11) of each L-bent rod and one leg (21) of each U-bent rod is laying in a first common plane (E₁), caracterised in that the reinforcing cage comprises at least one area (B) in which the cage can be bent lengthwise, whereby in said area all transverse rods (1,2) are connected only by longitudinal rods (3-5), which lay in said first plane (E₁), in which both the legs (11) of the L-bent transverse rods as well as the legs (21) of the U-bent transverse rods are laying.
2. Reinforcing cage as claimed in claim 1, characterised in that it comprises an additional longitudinal rod (6) laying in said first plane (E₁) connecting only the free ends (11) of the long L-bent transverse rods (1) with each other.
3. Reinforcing cage as claimed in claim 2, characterised in that the reinforcing cage comprises at least one straight, comparative rigid area (A) in which the ends of the legs (10) of said L-bent transverse rods (1), which lay in a second plane (E₂) perpendicular to said first plane (E₁), are connected by an additional longitudinal rod (7) with each other.
4. Reinforcing cage as claimed in claim 2, characterised in that neighbouring legs (10) of two L-bent transverse rods (1), which lay in a second plane (E₂) perpendicular to said first plane are interconnected in pairs by sections of rods (8)

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