DE9113086U1 - Storage device for reinforcing bars to be anchored in a concrete wall - Google Patents

Abstract

In the case of a wall connection box for supporting reinforcing bars (12) which are to be anchored in a concrete wall and are bent at an angle, a prefabricated base shell (10) in the form of a strip is provided. Said base shell has depressions in the plan-view surface (10C) which are intended for the subsequent reception of a leg (12A) of each reinforcing bar (12), the second leg (12C), bent with respect to said reinforcing bar, projecting out of the base shell. The depressions are configured as individual, channels (11) which are themselves angled-off and are intended for the lateral reception of the (first) leg (12A) bearing more or less closely thereon. In this way, the channels (11) also accommodate the bend portion (12B) adjoining the first leg (12A). <IMAGE>

Description

Betomax plastics and metal goods factory GmbH, 4040 Neuss

Storage device for reinforcing bars to be anchored in a concrete wall

The invention relates to a device (wall connection box) for insertion into a formwork for a concrete wall for storing reinforcing bars to be anchored in the concrete wall with the characterizing features of claim 1.

In generic wall connection boxes* as known from EP 026 803 Bl, two trough-shaped recesses are known for receiving the right and left bent legs of a plurality of bow-shaped reinforcing bars. In order to fix the bent (first) legs of the reinforcing bars in the two troughs of the base shell and thus also in relation to the base shell and to keep the angled (first) legs of the reinforcing bars completely away from the concrete of the wall in whose formwork the wall connection box is inserted, the two troughs are filled with an embedding compound. After the formwork of this concrete wall has been removed, the base shell, which is designed as a deep-drawn part, for example, is pulled out of the recess it has formed in the concrete wall. The still bent (first) legs of the reinforcement bars must then be freed from their embedding compound before they can be bent out of the wall surface. Since in the area of the wall between the already concreted (second) and the initially bent (first) leg of the reinforcement bars, there are correspondingly shaped wall grooves on their convex outer sides,

- 2 - also called retaining element for reinforcement connections -

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If the reinforcement elements in the side walls are adjacent to the recesses provided in the base shell, these bending sections are free of concrete at least on the convex outside after the base shell has been pulled off and the embedding compound has been removed, so that the reinforcement bars can be straightened without a swan-neck-shaped bend. These known wall connection boxes have the disadvantage that their production costs are similar to those of the other known wall connection boxes due to the use of the embedding compound and its hardening time, and that removing the embedding compound is not only complex, but also represents an environmental problem because the embedding compound breaks into small particles that can hardly be disposed of under the conditions prevailing on construction sites.

Based on this, the invention is based on the object of creating a generic wall connection box which, while retaining the advantages of the known wall connection boxes, is also less complex to manufacture and formwork.

This object is achieved according to the invention by a wall connection box with the features of claim 1.

Wall connection boxes according to the invention can be manufactured in a single operation both as a deep-drawn molded part made of more or less thick plastic film, and as a cast or injection-molded molded part, e.g. made of foamed plastic, in particular with a smooth, skin-like or coated top surface. It is only necessary to adjust the width of the individual angled channels and the position of the individual channels relative to one another to the material thickness and the bending shape as well as the desired arrangement.

the reinforcement bars. Since there are essentially only three or four common diameters for such reinforcement bars, as a rule only the distance between the individual reinforcement bars in the longitudinal direction of the strip-shaped base shell needs to be taken into account. When using stirrup-shaped reinforcement bars, i.e. when two reinforcement bars are connected to one another in a stirrup shape at the free ends of their second legs, i.e. when two reinforcement bars are bent from a single bar section, the stirrup widths, i.e. the lateral distances between the reinforcement bars connected to one another by the stirrup, i.e. approximately perpendicular to the longitudinal direction of the strip-shaped base shell, can be different. In order to avoid each individual stirrup width requiring a different manufacturing tool for the base shell, longitudinally divided base shells can be used, as is also known per se, the lateral distance between which is then determined by the respective stirrup width.

With the wall connection boxes according to the invention, it has been possible for the first time to manage without covering or embedding the initially bent (first) legs of the reinforcement bars, without this advantage being achieved by accepting significant disadvantages.

It has been shown that the provision of the angled grooves according to the invention for receiving the bent (first) legs and the bent sections of the reinforcing bars is sufficient to allow the reinforcing bars to be easily straightened, i.e. bent out of the manufactured concrete wall, after removing the only foreign body, namely the prefabricated base shell, without having to remove further foreign bodies, such as foam parts, or without the undesirable swan-neck-shaped bends forming in the reinforcing bars when straightening. It has been shown

namely, it has been shown that the rib remaining on the concrete wall after the base shell has been removed, formed by the individual reinforcement bar and the concrete adhering to it at least on the back, whose width and height are identical to the clear cross-sectional shape of the channels provided in the base shells, allows the reinforcement bars to be gripped behind with

the tool required to bend them is completely problem-free. The adjacent, not yet bent back reinforcing bars or the edges of the concrete wall formed by the side surfaces of the base shell act as abutments for the usually lever-like bending back tool, which can be a crowbar, for example. The concrete that inevitably penetrates above and, with correspondingly large tolerances, also to the side of the initially bent (first) legs into the grooves of the base shell when making a concrete wall has such small cross-sectional dimensions that the release of the initially bent (first) leg of each individual reinforcing bar requires comparatively small additional forces (in addition to the bending forces).

For the purposes of the invention, "angled gutters" mean that the main part of the gutter extends parallel to the surface of the base shell in order to accommodate the bent leg of each reinforcing bar. The gutter part angled from this gutter part connects to the first gutter part and leads out of the top view of the base shell in the same direction as the bent reinforcing bars in their bending section. This also protects the bending section on the side and on its convex outside from being run behind by the concrete of the concrete wall that was initially made.

If the channel depth is greater than the channel width, i.e. the cross-section of the reinforcement bars, this creates particularly favorable conditions for gripping the still bent (first) legs of the reinforcement bars when they are bent out using a bending tool.

In addition, the remaining rib-shaped concrete

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rich /interlocking surfaces for the component to be concreted later.

If the width of the angled channels in the base shell corresponds particularly precisely or even slightly under the cross-sectional dimension of the reinforcement bars, the reinforcement bars are already held sufficiently firmly to the base shell by appropriate surface pressure. However, it can be helpful to provide elements to hold the first legs in the individual channels. For this purpose, the channels can be provided with cross-sectional narrowing elements, such as cams or webs, on their upper edge, between which the first legs and bending sections of the reinforcement bars can be inserted into the cross-sectional dimensions behind them.

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other channel areas/. Additional small components such as clamps, clips or strips of flat material can also be used as holding elements. Such clamps can act like staples, or the base shell has openings on the edges of the channel through which the legs of U-shaped clamps, which hold the reinforcing bars inserted in the channels from above, can be inserted. On the back of the base shell, the leg ends of the clamps protruding there can be bent sideways. Small shaped bodies can be used as clips, which are pressed from above against the leg of the reinforcing bar lying in the channel and which cling to the sides of the channel walls. Instead of the

Instead of using individual clips of this kind, a strip-shaped material, such as a strip of material made of expanded metal, can also be used, the width of which corresponds to the width of the gutter with a certain excess, and which can be pressed into the gutter above the leg of the reinforcement bar inserted into the gutter in order to grip the gutter wall with its long edges.

Base shells according to the invention may have only a low torsional stability, since no embedding materials or similar additional stiffening components are provided. In order to ensure that the wall connection box can be inserted tightly into the formwork of the concrete wall that is to be concreted first, i.e. to prevent concrete from penetrating between the formwork and the wall connection box, an edge flange arranged at the height of the base shell's bottom surface or corresponding individual flange surfaces are preferably provided. These not only make it easier to attach the wall connection box to the formwork, but also to press the wall connection box onto the formwork by the pressure of the still liquid concrete directed onto the formwork wall. In the same way, recesses provided in the base shell (according to claim 5) work, which preferably reach down to the base shell's bottom surface and form as large a pressure surface as possible there.

The base shells according to the invention can be extremely thin-walled and therefore require little material. In order to achieve an evasive torsional rigidity or bending rigidity of the wall connection box provided with the reinforcement bars, stiffening strips (according to claim 6) are preferably provided, which are approximately parallel

to the longitudinal direction of the strip-shaped base shells. As a particularly advantageous embodiment of such stiffening strips, webs made of appropriately rigid material can be provided, which can be clamped into longitudinal grooves formed for this purpose in the base shell or can be secured there in some other way and are provided in particular in the edge zone (claim 7). As another alternative (according to claim 8), a strip-shaped back element can be provided, which can be inserted on both sides into longitudinal grooves provided in the bottom area of the base shell and can even be reused under certain circumstances. In order to avoid such stiffening strips having to be produced in a further work step, they can also be made from the material for the base shell and connected to it in one piece and folded over at a suitable point.

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to serve as the back (bottom) of the base shell. At the edge opposite the fold line, the back can be connected to the base shell, e.g. by staples.

Furthermore, it is not absolutely necessary for the channels formed in the base shell to have a closed bottom. They can also be open in their base and thus form slot-shaped openings in the base shell. Surprisingly, even in such a case, it is not harmful for the formwork removal and subsequent bending back of the reinforcing bars if fine components of the concrete, such as concrete milk etc., penetrate between the reinforcing bars placed in the channel and the side wall of the channel or slot.

The above-mentioned components, as well as those claimed and described in the embodiments, to be used according to the invention are subject to variations in their size, shape and

There are no special exceptions to the design, material selection and technical conception, so that the selection criteria known in the respective application area can be applied without restriction.

Further details, features and advantages of the subject matter of the invention emerge from the following description of the accompanying drawing, in which - by way of example - preferred embodiments of wall connection boxes according to the invention are shown. In the drawing:

Fig. 1 shows a wall connection box according to the invention (first embodiment) in plan view;

Fig. 2 shows essentially the same connection box in longitudinal side view (view A according to Fig. 1), partially broken open;

Fig. 3 shows a schematic cross-section of the same wall connection box (section along the line III-III according to Fig. 1);

Fig. 4 the same wall connection box in another schematic cross-sectional view (section along the line IV-IV according to Fig. 1);

Fig. 5 shows a wall connection box in an alternative embodiment in plan view;

Fig. 6 shows a schematic diagonal section of the same wall connection box along the line VI-VI according to Fig. 5);

Fig. 7 shows a first cross-sectional alternative of the same wall connection box (section along the line VII-VII according to Fig. 5);

Fig. 8 shows a second cross-sectional alternative of the same wall connection box (section along the line VIII-VIII according to Fig. 5);

Fig. 9 for the same wall connection box a first holding element ;

Fig. 10 for the same wall connection box a second holding element ;

Fig. 11 shows a third embodiment of a wall connection box according to the invention in plan view;

Fig. 12 a fourth embodiment of a wall connection box according to the invention in front view (without front wall);

Fig. 13 a fifth embodiment of a wall connection box according to the invention in front view (without front wall);

Fig. 14 different flange shapes of wall connection boxes according to the invention;

Fig. 15 of another wall connection box according to the invention a partially shown version with longitudinal edge reinforcement;

Fig. 16 shows three alternative embodiments of holding elements for wall connection boxes according to the invention.

- 10 -

The wall connection box shown in Fig. 1 to 4 has an elongated (strip-shaped) relatively flat base shell 10 with angled channels 11 open at the top, the elongated part HA of which extends approximately parallel to the surface and the angled part HB of which extends upwards from the base shell 10 in an arc on the elongated part HA. In order to be able to keep the base shell as flat as possible without the bending sections 12B of the reinforcement bars 12 bent into angles, which are to be subsequently inserted into the prefabricated base shells 10, being exposed to the migration of concrete on their convex side, the base shell 10 has elevations 1OB in these areas, into which the angled part HB of the channel 11 is incorporated.

The reinforcing bars 12, which are initially bent into angles and whose diameter and bending shape are adapted to the channels H, have a first leg 12A, which passes into the bending section 12B and which in turn passes into the second leg 12C, the first legs 12A being received in the elongated parts HA of the channels 11, while the second legs 12C protrude from the base shell 10.

The channels 11 are clearly deeper than the diameter of the reinforcing bars 12, so that after the formwork has been removed and the base shell 12 has been removed, a rib corresponding to the shape of the channels H remains within a strip-shaped wall depression left by the base shell, with the first legs 12A of the reinforcing bars 12 forming the uppermost rib part and the rib root being formed by concrete material.

-H-

In order to make the anchoring of the reinforcement bars 12 in the angled channels 11 even more secure, the channels 11 can be provided with constrictions on the opening side as holding elements 13, such as cams 13A, longitudinal webs 13B (Fig. 16), U-shaped clamps 13B (Fig. 10 and Fig. 16) or short clamping elements 13C (Fig. 9) or also elongated material strips 13D (Fig. 5 and Fig. 8) - as have otherwise been described in the introduction.

Flanges 14 at the level of the back plane (floor plane) of the base shells 10 press against the formwork 15 of the concrete wall under the hydrostatic pressure of the still liquid concrete - see arrows in Fig. 14. Additional, more or less large-area pressure depressions 16 can be provided at various points on the base shell 10. They also have a shape-reinforcing effect on the base shell 10 and can serve as additional abutments when levering out the first legs 12A from the channels HA.

In Fig. 1 to 4 it is shown in dash-dotted lines that the flange zones can be widened wherever there is corresponding space in the top view of the base shell 10 to the side of the channels 11.

As can also be seen in Fig. 3, when the first reinforcing bar legs cross each other, the grooves for the first legs that are higher up in the base shell 10 do not necessarily have to be as deep as the grooves for the first legs that are lower down. Rather, they can also be covered with strip-shaped, form-fitting covers 17, which are shown in dashed lines as an alternative in Fig. 3.

- 12 -

Fig. 5 shows a comparatively long base shell, the left part of which is at the top and the right part at the bottom of the picture, and which either serve to accommodate simply angled reinforcement bars (in contrast to the other embodiments in which reinforcement bars arranged next to each other are connected to form stirrups); these base shells can also serve as base shell longitudinal halves 1OA.

In Fig. 5 to 7, sheet metal strips are also shown which serve as handles 18 for formwork removal or as stiffening strips 19 and which are guided through slots 20 in the base shell 10.

In Fig. 7, the base shell 10 is shown as a molded part made of solid plastic material, while the embodiment according to Fig. 8 shows a film for the base shell 10 formed, for example, by deep drawing.

From Fig. 11 it can be seen that the legs of adjacent reinforcement bars initially located in the grooves 11 can also be connected to one another to form a stirrup shape.

From Fig. 12 it can be seen that a stiffening strip 19 can be designed as a flat material inserted into edge channels 21 or grooves.

Fig. 13 shows that a stiffening strip 19, which can also be used as a floor surface, can also be formed by folding over a lateral extension of the base shell 10. It can also be seen from Fig. 13 that the sole HC of the grooves 11 can also be open, i.e. the groove 11 can form a slot-shaped opening through the base shell 10.

- 13 -

Finally, it is clear from Fig. 15 that inserts close to the edge can also serve as stiffening strips 19 of the base shell 10.

- 14 -

List of reference symbols:

10 Base shell 1OA Base shell longitudinal half 1OB increase IOC Top view 11 gutter HA elongated part HB angled part HC sole 12 Reinforcing bar 12A first leg 12B Bending section 12C second leg 13 Holding element 13A cam 13B bracket 13C Clamping element 13 D Stripes 14 flange 15 formwork 16 Pressure recess 17 Cover strips 18 Handle 19 Stiffening strip 20 slot 21 gutter A Opinion

Claims (9)

Expectations: 1. Device (wall connection box) for insertion into a formwork (15) for a concrete wall for storing first and second legs (12A and 12C) to be anchored in the concrete wall and reinforcing bars (12) bent into angles (wall connection irons) having a bending section (12B) between them with a prefabricated base shell (10) in the form of a strip in plan view with recesses in the plan view surface (10C) for the subsequent accommodation of the first legs (12A) of the reinforcing bars (12) such that the second legs (12C) of the reinforcing bars (12) protrude from the base shell (10) stand out, characterized, that the recesses are designed as individual angled grooves (11) are shaped to accommodate laterally in a more or less tight manner a first leg (12A) and at least a first part of the bending section (12B) of the reinforcing bars (12) adjoining the leg and merging into the second leg. 2. Device according to claim 1, characterized in that the grooves (11) are deeper than the reinforcement bar thickness. 3. Device according to claim 1 or 2, characterized by holding elements (13) for holding the first legs (12A) in the grooves (11). 4. Device according to one of claims 1 to 3, characterized by flanges (14) at the level of the bottom surface of the base shell (10). 5. Device according to one of claims 1 to 4, characterized by pressure recesses (16) in the top view surface (C) of the base shell (10). 6. Device according to one of claims 1 to 5, characterized by stiffening strips (19) connected to the base shell (10). 7. Device according to claim 6, characterized in that the stiffening strips (19) are designed as webs. 8. Device according to claim 6 or 7, characterized in that the stiffening strips (19) are designed as the back of the base shell (10). 9. Device according to one of claims 1 to 8, characterized by a foldable back of the base shell (10).