EP0980936B1 - Reinforcing cage and its arrangement for the building of floors with hollow form units - Google Patents

Abstract

The round steel bent upper ring (20) and the lower ring (18) are fixed to one another coaxially and spaced apart by means of upright braces. The upper ring is reinforced by diagonal horizontal braces. In the reinforcement basket (10) a downwardly open, peripherally closed container (22) can be suspended, the ceiling wall (24) of which has ventilating holes (26). The container in the reinforcement basket is held at least approximately coaxially and the peripheral wall (28) of the container has at least approximately the same horizontal distances from the upright braces of the reinforcement basket. The basket is assembled from a number of U-stirrups (12) which cross one another in the yoke centre. They have teh same angle distances and their legs (14) represent the upright braces.

Description

The invention relates to a reinforcement cage for holding buoyancy-free hollow bodies for the production of reinforced concrete hollow panels and ceilings.

For hollow body ceilings, buoyancy-free hollow bodies have recently been used Unlike previous systems, there is no need to anchor against buoyancy but only to be placed on the formwork or the lower reinforcement layer need. The hollow bodies consist of cavities open at the bottom, e.g. out Expanded rib metal where the air can escape upwards.

The object of the invention is to provide a reinforcement cage for such buoyancy-free hollow bodies to create the arrangement of the hollow body in precisely defined positions both in the horizontal plane as well as the height allowed and a constant Ensures concrete coverage of the area and shear reinforcement.

This task is in the reinforcement cage of the type mentioned in the one out Round steel curved upper ring and a corresponding lower ring by standing Struts are attached to each other coaxially at a distance, solved in that in the Reinforcement cage is a container that is open at the bottom and closed at the bottom, whose top wall has ventilation holes, the container in the reinforcement cage is at least approximately coaxial and the peripheral wall of the container from the standing struts of the reinforcement cage at least approximately the same horizontal Distances.

Such a reinforcement cage without a container arranged in it is known from DE-U-8 813 325. This reinforcement cage is only as a spacer for reinforcement mesh of concrete ceilings used.

As an advantageous embodiment it is provided that the upper ring by means of horizontal Struts are braced diagonally.

The reinforcement cage is preferably composed of a number of U-brackets, that cross each other in the respective center of the yoke and have the same angular spacing and whose legs represent the standing struts.

A particularly important feature of the invention is that the Reinforcement cage has three U-brackets, the six legs of which in horizontal section Mark the corner points of a hexagon and the two rings are bent and hexagonal the corners are welded to the legs of the U-bracket.

The reinforcement cages are preferably designed as truncated pyramids, taper so easily from bottom to top, so that they can be stacked one inside the other. The same goes for for the cavity-forming containers, which in the simplest case have a circular contour and are correspondingly conical. In a preferred embodiment, the However, containers also in the form of hexagonal truncated pyramids. The Containers have at least on the peripheral wall, but preferably also on the top wall suspension means to attach them to the reinforcement cage and coaxial to be able to position. The suspension means preferably consist of flexible Tabs that have eyelets so that they can be firmly tied to the fastening basket with tied wire can. These tabs should therefore be flexible so that the containers fit tightly together to be able to stack. The tabs lay against the container walls. Instead of But tabs can also be provided only pairs of holes or individual holes To be able to attach fastening rings or wires to the container.

With the invention it is achieved that the cavity-forming container thanks to the Reinforcement cages can be positioned very precisely. The reinforcement cages serve at the same time as a spacer for the upper reinforcement layers. They are accessible. Shear reinforcement areas can be covered with full reinforcement and concrete realize without changing the cage height very simply that the Reinforcement cages can be used without hanging containers. The one with the reinforcement cages according to the invention and the suspended ceiling achieved has a honeycomb shape, which allows minimal wall thicknesses and with regard to the dent areas is optimally trained.

The tanks are attached to the reinforcement cages both horizontally and in height adapted, the container from the reinforcement cage preferably above and below is towered over. Preferably, the peripheral wall of the container runs equidistant from one of the Legs of the U-bracket stretched surface ring. This distance is about 2 cm, which is sufficient for a concrete cover.

In one embodiment, the lower hexagon ring is at the ends of the six Leg attached. This embodiment is suitable for putting on Reinforcement cage on the lower reinforcement layer. Using suitable spacers the reinforcement cages can be positioned exactly and wired to the lower ones Reinforcing layers of reinforcement. An alternative of the invention provides that the The stirrup legs protrude downwards over the lower ring. It becomes feet formed, which protrude through the lower reinforcement mats and on the Stand up slab formwork. In this embodiment there is an advantageous embodiment of the Invention in that bottom-side fixing plates are used, the three holes for Insert three legs of three adjacent reinforcement cages. The Insertion holes form the corners of an equilateral triangle. These fixing plates can be made of plastic or wood. The anchorage of the shear reinforcement is guaranteed by the horizontal ring reinforcement.

It is understood that different for the different ceilings or panel thicknesses Sizes are required for the reinforcement cages and therefore also for the suspended containers are. For example, a reinforcement cage is suitable for a 66 cm concrete slab lower ring has a diagonal of 70 cm and its upper ring has a diagonal of about 60 cm, with a height distance of the two rings of about 46 cm.

A particularly favorable mechanical manufacturing option results if the Reinforcement cage made from a number of uniformly pre-bent steel brackets is composed, preferably with a U-shaped part which at one end of the U-shaped Partially has a free leg, the axis of which is outside the plane of the U-shaped Partially arranged. The basket can thus be made from a single prefabricated Assemble reinforcement form.

In the embodiments described above, the basket and the hollow body are through Tabs and wires connected. The connection may be expensive and time-consuming. This is advantageously avoided if the reinforcement cage is central arranged connecting element for fastening the container. For example a special steel part is built that axially in the upper reinforcement is welded in. The container is then hung on the steel part. The number of Attachment points are thus drastically reduced.

The position of the body can be advantageously fixed when the reinforcement cage Has spacers for fixing the position of the container. A spacer can also be a Serve plate on the central connector.

The assembly time can be further advantageously reduced in an embodiment in which the Connecting element has a rear grip, which with a central opening of the Container can be brought into the locking position.

The connecting element consists, for example, of a triangular bottom-up shaped cutting edge, a spacer plate and a piece of reinforcing bar. spacer plate and the cutting edge are spaced so that there is space for the base thickness in between.

To assemble the container in the reinforcement cage, the cage is placed on the construction site Upside down. The container is now centered in the opening Cutting edge pressed. The plastic bottom of the container is now cut and penetrates up to the spacer. By turning the hollow body, the hollow body becomes permanently in fixed in its vertical and central position.

According to a particularly advantageous embodiment, the connecting element designed to be attachable. This shortens the assembly time even further.

To assemble the container in the reinforcement cage, the cage is placed on the construction site Upside down. The upper end of a plug-in connecting element is clip-shaped educated. With this end, the connecting element on the reinforcement cage is through simply attached to a yoke. A stop prevents the Connecting element. The rear grip of the fastener, which slips prevents the container, for example consists of two oppositely bent Tabs of a blank stamped in one piece from sheet metal. The connecting element can can thus be mass-produced inexpensively.

The container is now articulated. For the rigid fixation, three more are commercially available ring-shaped plastic spacers on three vertical reinforcement bars of the Reinforcement cage attached, between which the cavity former in a horizontal position is fixed.

The connection could also consist of a hole and screw with a nut and lock nut if necessary Washers or clip lock exist.

An advantageous arrangement of the baskets is described in claims 19 to 21.

With reference to the drawing, which shows exemplary embodiments of the invention, this will be closer described.

FIG. 1

eine dreidimensionale Ansicht eines neuen Bewehrungskorbes mit eingehängtem Behälter,

FIG. 2

eine Seitenansicht des eingebauten Bewehrungskorbes zwischen einer unteren und einer oberen Bewehrungslage einer Betondecke,

FIG. 3

eine Draufsicht auf den Bewehrungskorb gemäß Figuren 1 und 2,

FIG. 4

das mit den Bewehrungskörben gemäß Figuren 1 bis 3 erzielte Wabenbild einer Stahlbeton-Hohlkörperdecke,

FIG. 5

eine dreidimensionale Ansicht einer abgewandelten Ausführungsform eines Bewehrungskorbes,

FIG. 6

eine Seitenansicht des Bewehrungskorbes gemäß FIG. 5,

FIG. 7

eine Draufsicht auf den Bewehrungskorb gemäß Figuren 5 und 6,

FIG. 8

eine dreidimensionale Ansicht einer alternativen Form eines Bewehrungskorbes mit an einem Verbindungselement eingehängtem Behälter,

FIG. 9

eine dreidimensionale Ansicht eines Bewehrungskorbes und seiner Bestandteile,

FIG 10

eine detaillierte Ansicht des Verbindungselementes,

FIG 11

eine Draufsicht auf eine Wabenplatte,

FIG 12

eine alternative Ausführungsform des Verbindungselementes in Seitenansicht,

FIG 13

eine Draufsicht der Ausführungsform gemäß FIG .12 und

FIG 14

eine weitere Seitenansicht der Ausführungsform gemäß FIG. 12.

It shows:

FIG. 1

a three-dimensional view of a new reinforcement cage with a suspended container,

FIG. 2

a side view of the built-in reinforcement cage between a lower and an upper reinforcement layer of a concrete ceiling,

FIG. 3

2 shows a plan view of the reinforcement cage according to FIGS. 1 and 2,

FIG. 4

the honeycomb image of a reinforced concrete hollow body ceiling obtained with the reinforcement cages according to FIGS. 1 to 3,

FIG. 5

3 shows a three-dimensional view of a modified embodiment of a reinforcement cage,

FIG. 6

a side view of the reinforcement cage according to FIG. 5,

FIG. 7

5 shows a plan view of the reinforcement cage according to FIGS. 5 and 6,

FIG. 8th

3 shows a three-dimensional view of an alternative form of a reinforcement cage with a container suspended on a connecting element,

FIG. 9

a three-dimensional view of a reinforcement cage and its components,

FIG 10

a detailed view of the connecting element,

FIG 11

a plan view of a honeycomb panel,

FIG 12

an alternative embodiment of the connecting element in side view,

FIG. 13

a plan view of the embodiment of FIG. 12 and

FIG 14

another side view of the embodiment of FIG. 12th

A reinforcement cage 10 shown in Figure 1 consists of three U-brackets 12, which in the Angular distance of 60 ° to each other and their yokes in the each other Cross the axis of the reinforcement cage 10 and are welded there. The six legs 14 of the three U-brackets 12 together define a truncated pyramid-shaped surface ring with an even hexagon cross-section. The U-brackets are made of curved round steel and end in the embodiment according to FIGS. 1 to 3 at the bottom on a lower one Hexagon ring 18, where they are also welded at the corners of this ring. close Under the plane of the yokes 16 of the U-bracket 12 is another hexagon ring 20 also made of round steel and welded to the legs 14. The so made Reinforcement cage 10 is stable and walkable. The circumference of the upper ring 20 is somewhat less than that of the lower ring 18. Accordingly, the legs 14 are the Bracket 12 obliquely, so form the sides of a trapezoid. With a horizontal one Reinforcement cage 10, the legs 14 form an angle of approximately 10 ° with the vertical.

In the reinforcement cage 10, a container 22 is suspended, which is open at the bottom and its Cover wall 24 has a number of ventilation openings 26. The peripheral wall 28 of the Container 22 consists of six flat surfaces that are equidistant from those of the Bow legs 14 run across imaginary surfaces. The container 22 provides thus a truncated pyramid with a hexagonal cross section. The container circumference is something smaller than the circumference of the hexagon defined by the legs 14, the distance between the Container walls 28 of the legs 14 for sufficient concrete coverage of the Leg 14 is dimensioned and in the embodiment is 2 or 3 cm. The container 10 has on the top wall 24 and on the outer edges of the peripheral wall 28 Suspension tabs 30, by means of which the container 22 on the yokes 16 and Legs 14 of the reinforcement cage 10 fastened, in particular fastened with wire is.

The reinforcement cages 10 are sufficiently conical to be able to stack them one inside the other. The same applies to the containers 22, for which the hanging tabs 30 are flexible must be trained to ensure tight stacking.

The reinforcement cage 10 with the suspended, cavity-forming container 22 is accurate predetermined position placed on the lower reinforcement layer 32 and fastened. After completely covering the lower reinforcement layer 32 with the Reinforcement cages 10 becomes a walkable level through the reinforcement cages 10 created, on which the upper reinforcement 34 is arranged. The reinforcement cages 10 so carry the upper reinforcement 34 and put the spacers to the lower Reinforcement 32 represents. The yokes of the U-bracket of the reinforcement cages 10 are also on of the upper reinforcement 34.

In the area of high shear stresses, in particular in the support areas, are the same reinforcement cages 10, but without the suspended container 22nd used as shown in Figure 11.

FIG. FIG. 4 shows a plan view of an arrangement of the reinforcement cages 10 to be manufactured reinforced concrete ceiling. As can be seen from this figure, the Reinforcement cages 10 arranged in parallel rows 36, 38, the one row to another is offset by half a division. Three each of the hexagonal contoured Reinforcement cages 10 form an imaginary equilateral at three adjacent corners Triangle. The in FIG. 4, not shown, bound containers 22 limit with their Wall surfaces that arise after the concrete has been poured in, which means that Concrete ceiling receives a honeycomb structure.

As shown in FIG. 2 can be seen, the container 22 is lower than the reinforcement cage 10, the top wall 24 of the container 22 at a distance below the yokes 16 of the Reinforcement cage 10 is arranged. The upper reinforcement layer 34 thus receives one sufficient concrete coverage. The lower edge of the container 22 is also in the Distance above the lower ring 18, which rests on the lower reinforcement layer 32, so that sufficient concrete cover is ensured here too.

The execution according to FIG. 5 to 7 differs from the one described above Execution only in that the legs 14 of the U-bracket 12 of the reinforcement cage 10 are longer and protrude beyond the lower hexagon ring 18. This Leg extensions form feet 40 for the reinforcement cage 10 that are to be put on are determined on the slab formwork. Plastic caps can be used for exposed concrete ceilings can be used for the foot ends. The execution according to FIG. 5 allowed thanks to the protruding feet 40, however, an elegant positioning system that instead of individual Caps positioning plates, each having three holes, the corners of one form equilateral triangle. The three neighboring feet 40 out of three adjacent reinforcement cages 10 are then inserted into these holes and can therefore be positioned extremely precisely and therefore closer together be set to create thin honeycomb structures of the cavity ceiling. The length the feet 40 in the embodiment according to FIGS. 5 to 7 are preferably dimensioned in such a way that the lower ring 18 of the reinforcement cage 10 on the lower reinforcement layer 32nd rests or at most has a small height distance from it, so that a tight knot of the reinforcement cage 10 on the lower reinforcement 32 is possible.

Figure 8 shows a reinforcement cage to which a centrally attached connecting element 48 is attached. This connecting element is axially in the upper reinforcement stem 54 shrink wrapped. A container 22 can now easily be attached to this connecting element be hung up. On three of the six legs are commercially available at medium height Spacers 50 are attached, which fix the container in its position.

FIG. 9 shows a mechanical design of the reinforcement cage 10. It is shown that the reinforcement cage consists of six uniformly bent steel brackets 42 consists. The pre-bent steel bracket 42 consists of a U-shaped section 44 and an integrally formed leg 46, the axis of which is outside the imaginary plane of the U-shaped part 44 is arranged. The pre-bent steel brackets 42 are like this arranged that the ends of the integrally formed legs meet in a center where they are welded together to form a reinforcement stem 54. In addition, everyone is Corner points of a U-shaped part 44 with the corresponding corner points of the adjacent U-shaped section connected. The reinforcement cage 10 is therefore out six identical parts can be easily machined. The structure can also be in dissolve other substructures.

The connecting element 48 is shown in detail in FIG. A piece of rebar 56 is welded to the center of the reinforcement stem 54. At the bottom of the Reinforcement bars is a triangular shaped cutting edge 58 attached in a central Bring opening of the container 10 to be hung in the locking position. A spacer plate 52 is attached above the cutting edge. The distance between Cutting edge 58 and spacer plate 52 is selected so that the top wall 24 of the container 22nd there is space in between.

FIG. 11 shows a honeycomb panel consisting of reinforcement cages 10 and containers 22 is constructed. It can be clearly seen that in the areas of high shear stress, that is all around the pillars, reinforcement cages without using a container come.

Figure 12 shows a particularly advantageous, alternative embodiment of the connecting element 62. The rear grip 52 consists of two oppositely bent tabs of a blank cut from sheet metal. The top end 64 of the clip-on Connecting element 62 is formed in a clamp shape. With this end 64 it will Connecting element 62 on the reinforcement cage 10 by plugging it onto a yoke 16 attached. A stop 66, which is supported on a yoke 16 if necessary, prevents one Tilting of the connecting element 62.

FIGS. 13 and 14 show correct representations of this advantageous Embodiment of the connecting element 62. In Figure 13 is particularly the bracket-shaped design of the upper end 64 of the connecting element 62 detect. The position of the holder 66 and the rear grip are particularly good from FIG 52 can be seen.

LIST OF REFERENCE NUMBERS

10

reinforcing cage

12

U-bolts

14

leg

16

yokes

18

Hexagon ring (bottom)

20

Hexagon ring (top)

22

container

24

dirt wall

26

vent

28

peripheral wall

30

suspension brackets

32

lower reinforcement layer

34

upper reinforcement

40

feet

42

pre-bent steel

44

U-shaped part of 40

46

molded leg

48

connecting element

50

spacers

52

rear grip

54

reinforcement star

56

rebar

58

cutting edge

60

buttress

62

clip-on connector

64

bracket-shaped end

66

attack

68

sheet metal blank

Claims (21)

1. A reinforcing cage (10) for holding buoyancy-free hollow bodies for the production of reinforced concrete hollow body slabs and coverings, an upper ring (20), bent out of reinforcement steel, and a corresponding lower ring (18) being attached coaxially to one another at a distance using upright struts, a container (22), which is open on the bottom and closed around the circumference and whose ceiling wall (24) has ventilation holes (26), also being positioned in the reinforcing cage (10), and the container (22) being held at least approximately coaxially in the reinforcing cage (10) and the peripheral wall (28) of the container (22) having at least approximately the same horizontal distances from the upright struts of the reinforcement cage (10).
2. The reinforcement cage according to Claim 1, characterized in that the upper ring (20) is stiffened diagonally using horizontal struts.
3. The reinforcement cage according to Claim 1 or 2, characterized in that it is assembled from a number of U-bolts (12), which cross one another in the middles of the particular yokes and have equal angular intervals, and whose legs (14) represent the upright struts.
4. The reinforcement cage according to Claim 3, characterized in that it has three U-bolts (12), whose six legs (14) mark the corner points of a hexagon in horizontal section, and the two rings (18, 20) are each bent hexagonally and welded at the corners to the legs (14) of the U-bolts (12).
5. The reinforcement cage according to Claim 3 or 4, characterized in that the yokes (16) of the U-bolts (12) are welded to one another at their crossing points.
6. The reinforcement cage according to one of Claims 1 through 5, characterized in that the yokes (16) of the U-bolts (12) run at a distance above the plane spanned by the upper ring (20).
7. The reinforcement cage according to one of Claims 1 through 6, characterized in that the lower ring (18) is welded onto the free end of the legs (14) of the U-bolts (12).
8. The reinforcement cage according to one of Claims 1 through 7, characterized in that the bottom ring (18) is welded onto the legs (14) at a distance above a floor plane defined by the free ends of the legs (14) of the U-bolts (12).
9. The reinforcement cage according to one of Claims 1 through 8, characterized in that the upper ring (20) has a smaller circumference than the lower ring (18) and the legs (14) run diagonally at an angle in the range from 3° to 20° to the axis of the reinforcement cage (10) and multiple reinforcement cages are stackable one inside another.
10. The reinforcement cage according to one of Claims 1 through 9, characterized in that the container peripheral wall (28) runs equidistant to a flat ring spanned by the legs (14) of the U-bolts (12).
11. The reinforcement cage according to one of Claims 1 through 10, characterized in that the ceiling wall (24) of the container (22) is attachable at a distance below the yokes (16) of the U-bolts (12).
12. The reinforcement cage according to one of Claims 1 through 11, characterized in that the lower edge of the peripheral wall (28) of the container (22) lies above the floor plane defined by the free ends of the U-bolt legs (14).
13. The reinforcement cage according to one of Claims 1 through 12, characterized in that the container (22) is uniformly tapered from the open lower end toward the ceiling wall (24) and is stackable.
14. The reinforcement cage according to one of Claims 1 through 13, characterized in that the container (22) has suspension means (30) on the ceiling wall (24) and/or on the peripheral wall (28) for the coaxial attachment of the container (22) in the reinforcement cage (10).
15. The reinforcement cage according to one of Claims 1 through 14, characterized in that it is assembled from a number of uniformly curved steel bolts (42), preferably having a U-shaped part (44), which has a leg shaped on an end of the U-shaped part (44) whose axis is positioned outside the imaginary plane of the U-shaped part.
16. The reinforcement cage according to one of Claims 1 through 15, characterized in that it has a centrally positioned connection element (48), preferably a pluggable connection element (62), for attaching the container (22).
17. The reinforcement cage according to one of Claims 1 through 16, characterized in that it has spacers (50) for fixing the position of the container.
18. The reinforcement cage according to one of Claims 1 through 17, characterized in that the connection element (48) has a rear handle (52), which may be brought into a locking position with a central opening of the container (22).
19. An arrangement of reinforcement cages (10) according to one or more of Claims 4 through 18 on a lower reinforcement layer (32) or a floor formwork for reinforced concrete slabs or coverings, characterized in that the reinforcement cages (10) are placed in parallel rows (36, 38) in such a way that the foot points of three neighboring legs (14) of three neighboring reinforcement cages (10) form an equilateral triangle in horizontal section.
20. The arrangement according to Claim 19, characterized in that the side lengths of the triangle are in the range of one to four times the distance of each leg (14) from the associated container (22).
21. The arrangement according to Claim 19, characterized in that the feet (40) of each three neighboring legs (14) of three reinforcement cages (10) are inserted into holes of a shared positioning plate.

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