WO1999025941A1

WO1999025941A1 - Clamping element for pressing connecting pieces against a construction form for a concrete building component

Info

Publication number: WO1999025941A1
Application number: PCT/EP1998/007317
Authority: WO
Inventors: Thomas Notarfrancesco; Martin Reuber
Original assignee: Betomax Kunststoff- Und Metallwarenfabrik Gmbh & Co. Kg
Priority date: 1997-11-14
Filing date: 1998-11-16
Publication date: 1999-05-27
Also published as: DE29720149U1; DE19881633D2; WO1999025941A9

Abstract

The invention relates to a clamping element (10) for pressing connecting pieces (23) such as wall connecting elements (23A), anchoring or flexible hose connecting elements against a construction form (22) for a reinforced concrete building component that is to be produced. In order to avoid damage to the construction form, the inventive component comprises the following: at least one type of fixing means (11;11A,11B) for securing the clamping element to at least one reinforcing rod (21) of the building component that is to be produced; at least one first supporting body (12;12A,12B) to support the clamping element against at least one reinforcing rod of the building component that is to be produced; at least one second supporting body (13;13A,13B) to support the clamping element against the connecting piece (23,23A, ...) and at least one pressure spring or extension spring (14) to produce a pre-tension between the first and second supporting bodies, when mounted, between reinforcement and creation of the building component that is to be produced. The inventive device makes it easier to uncover the connecting piece after form stripping.

Description

"Small element for pressing connectors onto the formwork for a concrete component"

The invention relates to a clamping element for pressing connectors, such as wall connection, anchor or hose connection elements to the formwork for a concrete component.

When fastening reinforcement connections and other components, hereinafter referred to as connectors, there are currently only two options: first, to nail the connector to the formwork; this is the quickest and easiest way. Second, tie the connecting element to the reinforcement.

The first fastening option has the disadvantage of damage to the formwork. This problem does not exist with the second fastening option, but the reinforcement connection has no direct contact with the formwork, so that when

Filling the formwork Concrete gets between the connecting element and the formwork (rear run). After removing the formwork, the connecting element must therefore be exposed, which is associated with considerable effort. In some cases, it is even difficult to find the connecting elements, since they are covered with concrete, and it can only be guessed where the connecting element is. With anchor

CONFIRMATION COPY This problem is even more difficult due to the small dimensions.

The object of the invention is to avoid the problems described in the introduction and to provide a device which eliminates these disadvantages, i. H. that the device holds the connector in place without substantial damage to the formwork.

To solve this problem, a clamping element with the

Features of claim 1 proposed.

It was recognized that a combination of at least one fastening means (for fastening to the reinforcement), at least one first support body (for supporting the device according to the invention, ie the clamping element, on the reinforcement), at least one second support body (for supporting the invention) Device on the connecting piece to be fixed to the formwork) and a spring element, in other words, generally a spring-elastic means for producing a pretension (clamping tension) between the first and the second supporting body, which (spring element) in the installed state has a pressure force acting between the reinforcement and the formwork generated, easily holds the connector on the formwork inner surface and largely avoids backflow with concrete. The formwork therefore remains undamaged and the clamping element according to the invention can also be used successfully with formwork consisting of metal plates, so-called steel formwork.

Surprisingly, the thickness of the only relatively small concrete covering of the reinforcement, ie the small spacing gap available between the reinforcement and the formwork, is sufficient, apart from the actual connecting piece, also to accommodate a clamp according to the invention. to enable melementes. It has been recognized that the spring travel required to build up a sufficient clamping force only before the formwork is attached leads to the connection piece initially projecting further than the thickness of the intended concrete cover from the reinforcement. By attaching and the usual tensioning or supporting the formwork, a pressure force is generated between the connecting piece and the reinforcement, which leads to the compression spring being compressed or expanded until the connecting piece and the formwork gradually assume the desired distance and the desired position for the reinforcement.

A leaf spring proves to be particularly space-saving with regard to the available concrete cover; in particular it enables a one-piece design of the

Clamping element.

If the first support means at least one elongated rod, e.g. B. has at least one reinforcing bar section, this can be attached to the reinforcement in such a way, regardless of the spacing of the reinforcing bars of the reinforcement, in particular that the desired position of the connecting piece on the concrete surface to be produced can be maintained very precisely in the simplest way. This advantage is also achieved with fasteners with rows of holes or the like.

The position between the connector and the clamping element can be done in any way. In the case of connectors with anchor bolts, the clamping element is advantageously fastened to the anchor bolt.

The aforementioned components, as well as the components to be used according to the invention, which are claimed and described in the exemplary embodiment, are not subject to any size, shape, material selection or technical conception. NEN special exceptions, so that the selection criteria known in the respective area of application can be used without restriction.

Further details, features and advantages of the subject matter of the invention emerge from the subclaims and the following description of the associated drawings, in which — by way of example — preferred embodiments of the clamping element are shown. The drawings show

Fig. 1 to 36C show different embodiments of clamping elements according to the invention.

The clamping elements 10 can be made of plastic, sheet metal, spring steel, springs, spring steel pins or the like or

Combinations of this arise.

Each clamping element has a fastening means 11; ILA, 11B, such as clips, fastening clamps, connecting rods or wires or other fastening means. These allow the clamping element 10 to be connected to one or more reinforcing bars 21 of the reinforcement of the concrete component to be produced.

First support body 12; 12A, 12B of the clamping element 10 support it against at least one reinforcement from 21 of the concrete component to be produced. At least one second support body 13; 13A, 13B supports the clamping element 10 against the connecting piece 23, 23A, ... and presses it against the formwork 22 for the concrete component (see FIGS. 1, 7B,

7D, 11B and 36A). A spring element in the form of a compression or tension spring 14 is interposed between the first and second support bodies 12 and 13 and holds the first and second support bodies resiliently, at least in the installed state, under pressure (with respect to the formwork). The assembly is carried out so that the clamping device 10 is attached to the reinforcing bars 21 of the concrete component to be produced with the at least one fastening means 11, for. B. by hanging, tying, screwing, welding and the like. The clamping element 10 is supported by at least one support body 12 on the relevant, possibly a plurality of reinforcing bars. The connecting piece 23, 23A,... To be pressed onto the formwork can, if desired, be fastened or fastened to the clamping element. Examples of this can be found in figures and are explained further below.

When the formwork is attached, there is a contact pressure because the connecting piece between the inside of the formwork and the reinforcement is supported by the clamping element with increasing spring tension. The reinforcement bars are usually connected to each other in a tensile and / or pressure-resistant manner. In addition, spacers are usually provided so that the spring action of the clamping element is fully effective and is not lost in the reinforcement; however, if the reinforcement reacts resiliently, it can also be used to support the generation of contact pressure.

In detail:

From Fig. 1 it can be seen that a one-piece stamped and curved leaf spring can combine all necessary device components of the clamping element in one piece and in one piece.

Fig. 2 shows the same embodiment in a view from the direction of the formwork.

Fig. 3 shows, as in the embodiment of Fig. 1

Dovetail-shaped, springy or non-springy Fastening means 25 can be provided for the connecting piece 23. The available travel can be made particularly large by accommodating the connecting piece 23 in the zone determining the maximum travel. As a result, large spring deflections and a correspondingly soft spring can also be achieved in those cases in which the spring cannot dip between the reinforcement bars of the reinforcement and / or the concrete coverage is relatively small, as is shown by way of example in FIG. 28A.

FIG. 4 shows how the anchor bolt 24 of an anchor rail 23B can be inserted, in particular clicked, into a recess 26A of the clamping element 10. In Figures 4 to 6, the clamping element, which otherwise corresponds to the embodiment of FIG. 1, is only shown in part.

Fig. 5 shows the combination of a clamping element 10 with a hose connector 23C, as z. B. is applicable as a mouthpiece for connection with grouting hoses laid in concrete.

6 shows the fastening of a connecting element 23 with a clamping element 10 by means of a rivet 27.

FIG. 7A shows a clamping means 10 similar to the exemplary embodiment according to FIG. 1 with a trapezoidal (instead of a curved) compression spring configuration.

7B shows the same clamping element in the installed state. The double support on the reinforcement (see also Fig. 1) can also be seen here.

FIG. 7C shows an embodiment of the clamping element 10 which is modified twice compared to FIG. 7A. On the one hand, two instead of one fastening means ILA and 11B are provided in the form of bent metal tabs, so that the clamping element is attached Both ends can be hung in a reinforcing bar 21. On the other hand, the tab-shaped fastening means 11A, 11B are each provided in pairs while maintaining a distance D from one another, so that the fastening of the clamping element is also possible in those applications in which reinforcing rods 21A crossing the reinforcing rod holding the clamping element are provided in the region of the fastening point . In this respect see also the general illustration in FIG. 1. While in the embodiment according to FIGS. 1 to 7B the second support point of the first support body on which the further reinforcing bar 21B supporting the clamping element is displaceable, this is the case in the exemplary embodiments according to FIGS. 7C to 7F is not the case. As a result, the compression spring has a changed characteristic - namely, it is somewhat stiffer under otherwise identical conditions and must dip away from the formwork in the direction of the reinforcement if it is put under tension by attaching the formwork. This is shown in Figure 7D. From this figure it can also be seen that the compression spring in the tensioned state if necessary also in the

Reinforcement area.

The exemplary embodiments according to FIGS. 7E and 7F likewise show an application in which a screwable reinforcement connection with its reinforcement connection piece 23D has to be pressed onto a formwork. The associated reinforcing bar 23E thus extends away from the formwork, in particular at right angles. The reinforcing bar 23E can either penetrate a hole 26C in the clamping element 10, as shown in the exemplary embodiment according to FIG. 5, or into one

Recess 26A of the clamping element are used laterally, such as. B. shown in the embodiment of FIG. 4. A supplementary second spring element (spacing element 14B) is provided in the exemplary embodiment according to FIG. 7F. In both applications, one or the two spring elements plunge deep into the area of the Reinforcement element holding the clamping element, because reinforcement screw connections of the type shown can have a not inconsiderable overall length, which is in any case greater than the intended concrete cover B (FIG. 7D). The component shown in FIG. 7F and mentioned above as an additional spring element can also - possibly even exclusively - have the task of serving for a suitable consideration of the length of the reinforcement connection piece 23D, thus fulfilling the function of a spacer or length adjustment means. Like a comparison with that

7A / B shows, in the exemplary embodiments according to FIGS. 7E and 7F the spring element is arranged in a direction oriented away from the formwork 22.

The exemplary embodiments according to FIGS. 8 and 9 show that a plurality of spring elements can also be provided in a parallel arrangement, for example in order to press longer connecting pieces against the casing in a force-distributed manner (FIG. 8) or that the trapezoidal shape of the spring element, as was explained in connection with FIGS. 7A to 7F, can be inverted (Fig. 9).

The exemplary embodiments according to FIGS. 10 to 11B show that a clamping element according to the invention is also possible with a single first and second support element for support on the reinforcement and the connecting piece.

The exemplary embodiments according to FIGS. 12 to 16B show further variants of the possible designs of the spring element, which can also be made in a meandering shape from a spring sheet metal strip, as shown in the dashed variant of FIG. 12. In these exemplary embodiments, a first possibility of supporting the reinforcement is provided in the area of the fastening means 11. The elongated area adjoining this (in the drawing below) can be attached to Serve anywhere on a further reinforcement bar (Fig. 16A / B). 15 a so-called wall connection box 23A is clamped to the one-piece clamping element 10.

The exemplary embodiments according to FIGS. 17 to 19 represent further variants of a one-piece clamping element with a double possibility of supporting the reinforcement, in FIG. 17 the combination with a wall connection reinforcement, in FIG. 18 a spiral leaf spring and in FIG. 19 spring tongues 14C punched out and bent out of a sheet metal for one Many different pressure points are realized.

The exemplary embodiments according to FIGS. 20 to 22 basically show two-part clamping elements in which the fastening means each represents a separate component. The fastening means according to FIG. 20 is a pair of connecting wires 11C, according to FIG. 21 a clamp HD and according to FIG. 22 a fastening clip HE.

In the embodiments according to FIGS. 23A, 23B and 24, the clamping element is basically in three parts. A spiral spring is used as the compression spring. The second support body 13 (for the connecting piece) is fastened to one end of the spring (FIGS. 23A and 23B), eg. B. by welding (Fig.

23A). At the other end of the spring, the first support body 12 is arranged for at least one reinforcing bar together with fastening means. For this purpose, in the exemplary embodiment according to FIGS. 23A and 23B, a fastening clip HE welded to the second spring end is used, while according to the exemplary embodiment according to FIG. 24 a further form of a clamp HD is used. The embodiment according to FIG. 24 also contains the special feature that the spiral spring is surrounded by short telescopic pipe sections 28A, B. 23B also provides a guide 33A / B for the connecting element 23. In the embodiments according to FIGS. 25A to 26, there is the special feature in the combined fastening means with the first support body, which is designed as a simple stamped / bent part and which holds a coil spring by means of holding tabs 29 punched out and bent out of a sheet metal blank. In the exemplary embodiment according to FIG. 25A, the other end of the compression spring serves simultaneously as a second support body 13. A fastening clip HE welded onto the opposite rear side is provided as the fastening means. In contrast, the embodiment according to FIG. 26 is simplified in that, instead of a fastening clip, fastening tabs HF which are punched out and bent by approximately 180 ° are provided as fastening means.

The exemplary embodiments according to FIGS. 27A to 29B show conical coil springs as compression springs and two reinforcement bar sections arranged parallel to one another as first support bodies. Since the section lengths are freely selectable, they can be long enough to be attached to two reinforcement bars 21, 21B (FIG. 30) by tying them in each case. The position of the clamping element with respect to the reinforcement can therefore be done somewhat freely and entirely according to the needs of the positioning of the connecting element. The pairing of the first

Support body (rebar sections) enables the conical coil spring to be supported without tilting. In the embodiment according to FIGS. 27A / B, the free spring end (shown on the left in FIG. 27A) wraps around the foot 24A of an anchor bolt 24, which for anchoring is attached to an anchor rail 23B on the rear side thereof, e.g. B. is welded. The coil spring is welded to the two reinforcing bar sections 12D. This is also the case with the exemplary embodiment according to FIG. 28A. In the case of the two exemplary embodiments according to FIGS. 27A to 28D is the conical

Coil spring completely relaxed at first. First the attachment the formwork puts them under compressive stress. In contrast, the conical compression spring in the exemplary embodiment according to FIG. 29A / B is prestressed when the clamping element is assembled. For this purpose, the spiral spring is not welded to the reinforcing bar sections 12D, but is secured in position in a locking plate 30 which is welded to the two reinforcing bar sections by the head 24B of the anchor bolt 24 penetrating the spring engaging in the locking plate, which is because of the selected length dimensions only succeed if the spring is slightly preloaded. This ensures that the latter cannot be lost without welding the spring to the rebar sections. For the rest, from the exemplary embodiment according to FIGS. 28A to 28D it can be seen that for the captive fastening of the clamping element to the rear of the anchoring rail, a clamping foot (foot 24A) is provided which surrounds the anchor bolt in one-part (FIGS. 28B / C) or in a multi-part version (FIG. 28D) and the free one Spring end catches.

The embodiments according to FIGS. 30 and 34A to 36C show first supporting bodies in the form of reinforcing bar sections 12D which can be variably attached to the reinforcement. According to FIG. 30, the compression spring and the second support body are similar to those in FIG. 1. The two embodiments according to FIGS. 34A and 34B show the use of resilient flat strip strips instead of spiral compression springs for applications such as those shown in FIGS. 27A through 29B. FIG. 35 shows a clamping element as can be used for the embodiment according to FIGS. 34A and 34B:

A resilient flat strip is connected to two reinforcing bar sections by welding and is provided with three cutouts for attachment to an anchor bolt 24 of an anchor rail 23B, the central cutout 26A similar to the exemplary embodiment according to FIG. 4 and the two other cutouts as keyhole-shaped passages. Refractions 34 after bending the resilient ribbon strip allow hanging in the head 24B of the anchor bolt. In the two embodiments, the spring can therefore be held under prestress from the outset.

In the embodiment according to FIGS. 36A to 36C is a special form of the one already shown in FIGS. 27A / B shown clamping element (in which case the spiral compression spring is cylindrical). In the exemplary embodiment shown, the clamping element in turn serves to fasten a reinforcement (screw) connection piece, as already described in connection with the exemplary embodiments according to FIGS. 7E and 7F. A wedge 31 engaging in the spiral passages of the spring at a predeterminable point determines the length of the spring travel as a function of the length of the reinforcement connection piece and the concrete cover as well as the desired pressing force. In this embodiment, the spring is loaded under tension when installed.

Finally, the exemplary embodiments according to FIGS. 31 to 33 multi-part clamping elements, in which the spring has been omitted for the sake of clarity. So only the fastener with the first support body is shown. The support body 12 (in contrast to FIG. 29B) is designed as an elongated sheet metal strip and is provided with a cut-out (opening 32) into which the head 24B of an anchor bolt 24, as is shown in the exemplary embodiments according to FIGS. 27A, 28A and 29A are used. In the exemplary embodiment according to FIG. 31, the anchor bolt can be hooked into an opening 32 in different positions between two adjacent reinforcing bars and can thus be particularly well adapted to the positioning requirements. In the embodiment according to FIGS. 32A to 32C, the head 24B is clamped by elements projecting resiliently into the opening 32, while in the exemplary embodiment according to FIG. Movement is hooked into an opening 32 adapted to the shape of the head 24B.

Reference list

10 clamping element

11 Fasteners HA Fasteners HB Fasteners HC Connecting wires

HD clamp

HE fastening clip

HF mounting brackets

12 support body 12A support body 12B support body 12C rod

12D rebar sections

13 support body 13A support body 13B support body

14 compression or tension spring 14A leaf spring

14B spacer

14C spring tongues

21 rebar 21A / B rebar

22 formwork

23 connecting piece 23A wall connection element 23B anchor rail

23C hose connector

23D rebar connector

23E rebar

24 anchor bolts 24A feet

24B head

25 fasteners 26A recess 26B recording

26C hole

27 rivet

28A / B tubes

29 retaining tabs

20 locking plate

31 wedge

32 breakthrough

33A / B leadership

34 breakthroughs

B concrete cover

C distance

Claims

Expectations

1. clamping element (10) for pressing connectors (23), such as wall connection (23A), anchor or hose connection elements, to the formwork (22) for a reinforced concrete component to be produced, consisting of

at least one fastening means (11; HA, 11B) for fastening the clamping element (10) to at least one reinforcing bar (21) of the concrete component to be produced,

at least one first support body (12; 12A, 12B) for supporting the clamping element against at least one reinforcing bar of the concrete component to be produced,

at least one second support body (13; 13A, 13B) for supporting the clamping element (10) against the connecting piece (23, 23A, ...) and

- At least one compression or tension spring (14) for

Establishing a prestress between the first and the second support body in the installed state between the reinforcement and the formwork of the concrete component to be produced.

2nd Clamping element according to claim 1, characterized in that it consists of a bent leaf spring or spiral spring.

3. Clamping element according to claim 1 or 2, characterized in that the at least one first support body (12) consists of at least one elongated rod (12C), such as a reinforcing bar section (12D), for variable positioning of the clamping element on the reinforcement.

4. Clamping element according to one of claims 1 to 3, characterized in that the compression or tension spring (14) receives an anchor bolt of the connecting piece.

5. Clamping element according to one of claims 1 to 4, characterized in that it has a fastening means (25) for fastening it to the connecting piece or for fastening the connecting piece to the clamping element.

6. Clamping element according to one of claims 1 to 5, characterized in that a receptacle (26B) is provided for the connecting piece, which at least partially protrudes into the zone of the clamping element which determines the maximum spring travel.