EP0744508B1 - Device for forming a shear reinforcement for flat slabs - Google Patents

Description

The invention relates to a device for forming a Shear reinforcement for flat slabs in the preamble of the claim 1 specified genus.

EP 0 495 334 A1 describes shear reinforcement for flat slabs described as several shear reinforcement elements at least approximately perpendicular to the ceiling surface and reinforcing bars extending inside the flat slab having. These rebars are on theirs upper and lower ends each with a conically thickened Head and attached in groups at their upper ends welded on a spacer. This spacer lies on a bending reinforcement and has parallel to Flat ceiling plane angled areas with a predetermined Minimum length, so that the almost vertical course of the reinforcement bars that passed through the bending reinforcement are not lost until the concrete has hardened goes. Due to the welded connection between Spacers and rebars can use these devices can only be installed as a unit in the formwork, so that the distances of the reinforcing bars to the mesh size be adapted to the grid-shaped bending reinforcement so that the reinforcing bars through the bending reinforcement can be threaded through from above. The must also Length of the reinforcement bars to the height of the bending reinforcement be coordinated within the formwork. With this Shear reinforcement can therefore not have different structural Requirements are met individually. It is also why a variety of different devices too manufacture and keep ready because the shear reinforcement elements, i.e. the reinforcement bars, depending on the ceiling construction and the demands on the load in different Distances to each other must be provided. As a result of But these distances are welded to everyone individual shear reinforcement.

DE 27 27 159 B2 is a shear reinforcement for on concrete columns superimposed flat ceilings made of steel or prestressed concrete described in which perpendicular to the flat ceiling plane reinforcing bars welded onto a flat steel are. The reinforcement bars can also be used with this version with the flat steel only as a prefabricated unit be used in the formwork of the flat slab, the lattice-shaped bending reinforcement subsequently under simultaneous Thread the reinforcing bars got to. This shear reinforcement also has the rest disadvantages described.

WO93 / 12305 describes a reinforcement anchor for the Shear reinforcement of reinforced concrete slabs or beams. This Reinforcement anchor has an elongated anchor shaft disc-shaped anchor heads at its ends. A rebar a reinforcement layer or reinforced concrete slab or the beam is supported by a resilient wire bracket that forms a reinforcement holder. An upper arm leg engages with a holding projection in a holding hole in the face of the anchor head. A side bracket leg of the reinforcement holder encompasses the on the Inner surface of the anchor head and the anchor shaft Rebar.

The resilient wire bracket can align the reinforcement anchor not ensure orthogonal to the ceiling level, because the wire bracket can be rotated around the reinforcement bar. in the the other is the rigidity of such a wire bracket not suitable, the direction of the reinforcement anchor exactly to specify.

DE 34 11 591 C1 is a shear reinforcement element for Reinforced concrete structures described. This shear reinforcement element has a plurality of reinforcing bar sections made of reinforcing steel, being arranged at both ends Anchors are provided. The rebar sections are attached to a flexible connecting element, to which it is essentially orthogonal to its Longitudinal extension. The connecting element in any case be so flexible that the rebar sections collapsible as well as in relation to their Order in zigzag, circular, rectangular or Like. Can be used.

However, such a flexible connecting element is not suitable the position of the shear reinforcement elements to be determined exactly, neither in their orthogonal alignment to the ceiling level with respect to their distance from each other, so additional measures are required to move the shear reinforcement elements during filling to prevent concrete.

DE-28 29 941 A1 is a reinforced concrete connection device described, by means of the finned steel pieces adjacent Building parts are interconnectable. This connection device comprises a support element, which if necessary can be designed as a U-profile. In the bottom of the U-profiles are coupling pieces that are used with the U-profile are to be connected non-positively. These coupling pieces serve to hammer head-like head parts of the concrete rib steel pieces record and thus a non-positive To create connection. Because the coupling pieces provided on both sides of the support element are on the other side of the support element also a concrete rib steel piece with a hammer head Headboard attached. The U-profile itself serves the creation of a defined cavity, which at Concreting should be left out.

The invention has for its object the device to form a shear reinforcement for flat slabs in the To develop the preamble of claim 1, that the connection of the shear reinforcement elements with the Holding element is possible at any time especially when inserted into the formwork, the Distance between two consecutive shear reinforcement elements according to the different requirements is selectable.

The object is achieved with the features of one of claims 1, 2 or 6.

The main advantages of the invention can be seen in that the connection of the reinforcement elements with the holding element easy to produce by positive locking and at least until the final determination of the distances between neighboring reinforcement elements is detachable. Thereby adaptation to individual requirements is possible. In particular, the device can be used on the construction site be completed by assembling the parts, whereby the reinforcement elements in the respective needs Way can be arranged. Another advantage is there in that also as a material for the holding elements Plastic can be used, thereby preventing corrosion Protective measures can be omitted.

The shear reinforcement elements are in known form essentially the shape of a bolt, one on at least one end of its shaft Head. Such a head doesn't just make a better one Transfer of forces between reinforcement and concrete, but also serves for attachment to the holding elements. Such one Holding element is a rail on which several shear reinforcement elements are attachable, and preferably made of stainless Material is made, so that the rail is also a protective cover can form for the reinforcement elements. According to Claim 6, the rail is designed as a C-profile, the lateral edges of the profile the head of the shear reinforcement element reach behind. For this it is advantageous that the head has a partially circular arc shape and flattened on two opposite sides is, the distance between the flats is smaller is the distance between the side edges of the C-profile. In this way, the head can be inserted into the rail be that its flattenings in the longitudinal direction of the Rail run, and by rotating the reinforcement element the positive connection is formed around its longitudinal axis made for example in the manner of a bayonet catch. Additional fasteners such as No screws or clamps are required.

According to claim 1 is the rail formed as a U-profile, wherein the head of the shear reinforcement element by means of inwards deformed wall parts of the U-profile is held. The concerned Wall parts are for ease of deformation through slits or notches in the lateral edges of the U-profile limited. The U-profile can also be designed according to claim 2 be that shaped portions in its bottom region are provided, which reach under the edge of the head. Here Depending on the design, it is possible to use the shear reinforcement elements with her head laterally between the molded ones To insert sections and the rail. It can however, a push-through also in another configuration of the bolt shaft by a molded between the Sections located opening take place so that the head lies on the shaped sections.

In addition to the possibility of the head of the shear reinforcement element pinching in the profile of the rail still the possibility of having the profile facing inwards To provide noses or arches, which are preferred have a regular arrangement. Through this Noses or arches are also insufficient Clamping force between the head and the profile is particularly important against longitudinal displacement of the head in the rail given. With an appropriate design, the bulges work or lugs as notches, the latching connection deliberate release of the shear reinforcement element from the Rail, for example to correct for the Carrying out positioning enables. For one Snap connection can be a recess on the front of the head be provided in the one on the base of the Profiled curvature grips. The distance between two successive curvatures in the longitudinal direction of the rail should correspond approximately to the diameter of the head, so that possibly a very dense sequence of Shear reinforcement elements are provided on a rail can. Another design for securing the head against displacement in the longitudinal direction of the rail in that recesses are provided in the lateral edges are in the projections formed on the head of the bolt to grab.

So that the rails are not only loose on the reinforcing bars the top bending reinforcement of the flat slab, but without additional fasteners with the bending reinforcement are connectable, it is particularly useful in the side To provide openings around the edges of the U-profile for example, be arranged at regular intervals through which the reinforcing bars of the bending reinforcement be passed through.

Fig. 1

einen Längsschnitt durch eine Schiene mit Schubbewehrungselementen,

Fig. 2

die Ansicht in Richtung des Pfeiles II in Fig. 1,

Fig. 3

einen Schnitt entlang der Linie III-III in Fig. 1,

Fig. 4 bis 6

eine Ausführungsvariante zu Fig. 1 bis 3,

Fig. 7 bis 9

eine weitere Ausführungsvariante zu Fig. 1 bis 3,

Fig. 10

eine Seitenansicht einer Schiene mit Schubbewehrungselementen,

Fig. 11

einen Schnitt entlang der Linie XI-XI in Fig. 10,

Fig. 12 und 13

eine Ausführungsvariante zu Fig. 10 und 11,

Fig. 14 und 15

eine weitere Ausführungsvariante zu Fig. 10 und 11.

Embodiments of the device according to the invention are explained below with reference to the drawing. The drawing shows:

Fig. 1

a longitudinal section through a rail with shear reinforcement elements,

Fig. 2

the view in the direction of arrow II in Fig. 1,

Fig. 3

2 shows a section along the line III-III in FIG. 1,

4 to 6

an embodiment of Fig. 1 to 3,

7 to 9

a further embodiment variant to FIGS. 1 to 3,

Fig. 10

a side view of a rail with shear reinforcement elements,

Fig. 11

10 shows a section along the line XI-XI in FIG. 10,

12 and 13

10 and 11,

14 and 15

a further embodiment variant to FIGS. 10 and 11.

1 to 3 is a holding element 1 in the form of a designed as a C-profile rail 10 with arranged thereon Shear reinforcement elements 2 shown. The holding element 1 can made of metallic materials or in a particularly preferred one Way made of plastic. The shear reinforcement elements 2 are designed as bolts 3 with a shaft on the End of a head 4 is formed. Preferably, the Bolt 3 has a head 4 at each of its ends, so that Shear reinforcement element 2 designed completely the same at both ends is. As can be seen from Fig. 3, embrace lateral edges 5 and 6 of the rail 10 the head 4 of the Thrust reinforcement element 2, so that the head 4 in the rail 10 is held.

As shown in particular in Fig. 1, are in the longitudinal direction the rail 10 in the profile shape curvatures 8 and 9 arranged, with the curvatures 8 the base of the profile and the bulges 9 to the side edges 5 and 6 are located. These bulges 8 serve for fixing the shear reinforcement elements 2 in the longitudinal direction the rail, for which purpose the head 4 of the bolt 3 corresponding depressions 11 and 12 are located so that the As soon as the bulges fit into the recesses the head 4 has the predetermined position in the rail 10 occupies. As is particularly clear from Fig. 2, are the heads 4 of the bolts 3 are essentially circular and with two opposing flats 7 provided, these flattenings 7 parallel to each other run.

The width B of the head 4 between the flats 7 is slightly smaller than the distance A between the side Edges 5 and 6 so that the head 4 from the open Side of the C-profile can be used in the rail 10. For this the head 4 with its flats 7 is aligned in such a way that the flats 7 in the longitudinal direction of the rail 10 run. As soon as the head 4 with its end face bears on the base of the rail 10, the bolt 3 rotated about its longitudinal axis so that the arcuate Portions of the head 4 orthogonal to the longitudinal direction of the Rail 10 are directed. In this position the Curvatures 9 in the depressions 11 at the edge of the head 4 and thus lock the shear reinforcement element 2 in the predetermined position on the holding element 1.

The embodiment described in FIGS. 4 to 6 corresponds essentially to that of FIG. 1 to 3 has already been described, so that for the same parts the reference numerals with the previously described embodiment to match. The arrangement is different the means for fixing the head 4 of the shear reinforcement elements 2, which in the embodiment of FIGS. 4 to 6 not on the side edges 5 and 6 of the rail 10 or are provided on the peripheral edge of the head 4, but in the form of arches 13 on the base of the rail 10 are trained. These arches 13 are located directly next to the circumference of the head 4, so that the shear reinforcement element - seen in the longitudinal direction of the rail 10 - of two arches 13 each and of course secured against displacement by the curvature 8 is. In this way, only the rail 10 is required Protrusions or curvatures 8, 13 are provided. On the perimeter the head 4 are no corresponding measures required.

The embodiment shown in FIGS. 7 to 9 shows a holding element 1, which consists of a bar 15, the Cross-section of a C-profile with side edges 17 and 18 includes. In the side edges 17 and 18 are regular Clearances transverse to the longitudinal direction of the rail 15 extending slots 16 arranged in the arranged on the head 4 Grip projections 14 and in this way Locking the shear reinforcement element 2 in the longitudinal direction cause the rail 15. In the material of the rail 15 it is preferably plastic, the material has sufficient elasticity to be able to temporary widening that is necessary to the protrusions 14 in the corresponding slots 16 in to go back to the original form. Even in the embodiment 7 to 9, the heads have 4 flats 7, so that the shear reinforcement elements 2 are attached the holding element 1 is possible in the same way as this has been described with reference to FIGS. 1 to 3.

10 and 11 show a holding element 1, which consists of a Rail 20 with a U-profile and thus perpendicular to Base of the rail 20 extending side edges 21 and 22 exists. The shear reinforcement elements 2 are with Provide heads 24, the end face of which is circular or square can be. For fastening the shear reinforcement elements 2 on the holding element 1, the heads 24 with their Bring the end face to the rail 20 and then Wall parts 23 of the lateral edges 21 and 22 deformed inward so that the head 24 is in firm contact hold on the base of the rail 20. To the Shear reinforcement elements 2 against displacement in the longitudinal direction to secure the rail 20 are on the base Arches 19 are provided, which are located directly next to the heads 24 are located and in this way determine their position exactly. The axial length of the wall part to be deformed slots or in the side edges Notches are provided. In the side edges 21 and 22 holes 25 are provided, for example for Implementation of reinforcing bars can serve.

The exemplary embodiment according to FIGS. 12 and 13 shows shear reinforcement elements 2 with heads 24, which on a rail 26th are attached with a U-profile. The width is the Rail less than the diameter of the head 24, and that open end of the U-profile is the shear reinforcement elements 2 turned away. Molded are formed in the bottom region of the rail 26 Sections 27 are provided, which are designed so that they reach behind the head 24 of the shear reinforcement element 2 and thus the head 24 against the bottom of the rail 26 to press. In lateral edges 28 and 29 of the rail 26 openings 25 are provided, which are also for receiving of reinforcing bars.

14 and 15 show an embodiment in which a rail 30 with a U-shaped profile in the bottom area downward curved portions 31 is provided between which openings 32 are formed. The middle range between the downwardly pronounced sections 31 is closed superscript sections 33 angled so that in a sufficiently large opening in the bottom region of the rail 30 for receiving the head 24 of the shear reinforcement element 2 results. The shear reinforcement element 2 is by the Opening 32 inserted from above until the head 24 on the bears pronounced sections 31, whereupon subsequently the superscript sections 33 to their original horizontal form can be traced back like this from the left part of FIG. 14 or the representation in Fig. 15 can be seen.

Claims (11)

1. Device for forming a shear reinforcement for flat slabs, with at least one elongated shear reinforcement member (2), which is to be positioned with its longitudinal axis at an angle to the plane of the slab, the shear reinforcement member (2) being essentially in the form of a bolt (3), which comprises a head (4, 24) at at least one end of its shaft and the shear reinforcement member (2) is to be connected in form-locking manner to a support member (1, 40) lying at right angles to its longitudinal axis, characterised in that the support member (1) is a bar (10, 15, 20, 30, 50), to which a plurality of shear reinforcement members (2) can be fastened and the bolt (3) and the support member (1; 40) can be fitted together, the bar (20) being constructed as a U-profile and the head (24) of the shear reinforcement member (2) being held by means of inwardly deformed wall parts of the side edges (21, 22) of the U-profile.
2. Device for forming a shear reinforcement for flat slabs, with at least one elongated shear reinforcement member (2), which is to be positioned with its longitudinal axis at an angle to the plane of the slab, the shear reinforcement member (2) having essentially the shape of a bolt (3), which comprises a head (4, 24) at at least one end of its shaft, and the shear reinforcement member (2) is to be connected in a form-locking manner to a support member (1, 40) lying at right angles to its longitudinal axis, characterised in that the support member (1) is a bar (10, 15, 20, 30, 50), to which a plurality of shear reinforcement members (2) can be fastened and the bolts (3) and the support member (1; 40) can be fitted together, the bar (26, 30) being constructed as a U-profile and shaped sections (27, 31) being provided in the base region of the U-profile, which sections engage below the edge of the head (24), in which case surfaces are provided in particular on the U-profile, against which the end face of the head (24) bears.
3. Device according to Claim 1, characterised in that the wall parts (23) provided for deformation are defined by slots or notches in the side edges (21, 22) of the U-profile.
4. Device according to Claim 2, characterised in that the surfaces for the abutment of the head (24) are formed by sections (33) at the U-profile of the bar (30) deformed after the assembly of the shear reinforcement member (2).
5. Device according to one of the preceding Claims, characterised in that openings (25), preferably at regular intervals, are provided in the side edges (21, 22, 28, 29) of the U-profile of the bar (20, 26).
6. Device for forming a shear reinforcement for flat slabs, with at least one elongated shear reinforcement member (2), which is to be positioned with its longitudinal axis at an angle to the plane of the slab, the shear reinforcement member (2) having essentially the shape of a bolt (3), which comprises a head (4, 24) at at least one end of its shaft, and the shear reinforcement member (2) is to be connected in a form-locking manner to a support member (1, 40) lying at right angles to its longitudinal axis, characterised in that the support member (1) is a bar (10, 15, 20, 30, 50), to which a plurality of shear reinforcement members (2) may be fastened and the bolts (3) and the support member (1; 40) can be fitted together and the bar (10, 15) is constructed as a C-profile, the side edges (5, 6, 127, 18) of the profile engaging behind the head (4) of the shear reinforcement member (2).
7. Device according to Claim 6, characterised in that the head (4) has a contour partly in the form of a circular arc and is provided on two opposite sides with flat portions (7), the width (B) between the flat portions (7) being less than the distance (A) between the side edges (5, 6; 17, 18) of the C-profile.
8. Device according to one of Claims 6 or 7, characterised in that provided in the side edges (17, 18) are recesses (16), in which engage projections (14) integrally formed on the head (4) of the bolt (3).
9. Device according to one of Claims 1 or 6, characterised in that the bar (10; 20) is provided with lugs or bulges (8, 9, 13, 19) directed into the profile, the lugs or bulges (8, 9, 13, 19) preferably having a regular arrangement.
10. Device according to Claim 9, characterised in that provided on the end face of the head (4) is a recess (12), in which a lug or bulge (8) located on the bottom surface of the profile of the bar (10) engages.
11. Device according to one of the preceding Claims, characterised in that the bar consists of non-corroding material, for example of synthetic material.

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