FORMWORK ELEMENT AND FORMWORK CONSTRUCTION KIT

Abstract

A concrete formwork construction having a formwork element (1) whose frame (3) is produced from flat steel, whereas the struts (4) of the formwork element (1) are formed of sectional steel.

Claims

1. A formwork element (1), comprising: a formwork skin (2), a frame (3) supporting the formwork skin (2), and struts (4) arranged within the frame (3) that support the formwork skin (2), wherein the frame (3) is produced from unprofiled flat steel, and the struts (4) are produced from open sectional steel, an even number of the struts (4) are arranged within the frame (3), of which two outer ones of the struts (4a, 4b) each have at least one plug-through opening (5) for an anchor, at least one of the struts (4) has at least first and second plug-through openings (5), wherein a shortest distance between the first plug-through opening (6) and the frame (3) is shorter than a shortest distance between the second plug-through opening (7) and the frame (3), and the frame (3) has a side ratio of 3 to 5.

2. The formwork element (1) as claimed in claim 1, wherein at least one of: the sectional steel is open to the formwork skin (2), the sectional steel has a symmetrical profile, or the sectional steel has at least one longitudinal bead (14) on a head side (13) thereof.

3. The formwork element (1) as claimed in claim 1, wherein two or four of the struts (4) are arranged within the frame (3).

4. The formwork element (1) as claimed in claim 1, wherein struts (4) are at least one of oriented parallel to one another or spaced uniformly apart from one another.

5. The formwork element (1) as claimed in claim 1, wherein the frame (10) includes frame legs (8, 9), and the second plug-through opening (7) is equally spaced apart from two mutually adjoining ones of the frame legs (8, 9).

6. The formwork element (1) as claimed in claim 1, wherein the struts (4) are produced from a sectional steel having at least one of a trapezoid profile or a trapezoidal cross section.

7. The formwork element (1) as claimed in claim 1, wherein the frame (3) is projection-free on inner side thereof.

8. The formwork element (1) as claimed in claim 1, wherein the frame (3) has at least two different types of connection openings (18, 19).

9. The formwork element (1) as claimed in claim 1, wherein the struts (4) are formed identically to one another.

10. A formwork construction kit comprising at least two different types of formwork elements (1) as claimed in claim 1, wherein two intersecting lines (23, 24) of the plug-through openings (5, 6, 7) of a first type of the formwork elements (1) are matched in their positions to a line (25) of the plug-through openings (5, 6, 7) of a second type of the formwork elements (1).

11. The formwork construction kit as claimed in claim 10, further comprising a connection clamp (20) and a plug-through bolt (23) configured for selectively connecting the formwork element (1) to a further formwork element.

12.-14. (canceled)

15. The formwork element (1) as claimed in claim 8, wherein a clear width of the different types of the connection openings (18, 19) transversely to the formwork skin (2) is chosen to be corresponding.

16. The formwork element (1) as claimed in claim 8, wherein at least a first type of the connection openings (18) is an oblong hole and a second type of the connection openings (19) is a round hole.

17. A formwork construction kit comprising at least two different types of formwork elements (1) as claimed in claim 1, wherein at least one type of the formwork elements (1) includes at least one connection clamp (20), and holding projections (22) on clamp arms (21) of the connection clamp (20) are configured to fit with the connection openings (18, 19) in the frame (3) of the formwork elements (1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The invention will now be described in more detail on the basis of two exemplary embodiments, but is not limited to these exemplary embodiments. Further exemplary embodiments result through a combination of the features of individual claims or a plurality of claims with one another and/or in the combination of individual features or a plurality of features of the exemplary embodiment. In the figures, in part in highly schematic illustration:

[0043] FIG. 1 shows an isometric rear view of a formwork element within whose frame four struts are arranged in a uniformly distributed manner,

[0044] FIG. 2 shows an isometric front view of a formwork skin of the formwork element illustrated in FIG. 1,

[0045] FIG. 3 shows an isometric rear view of a further formwork element within whose frame two struts are arranged in a uniformly distributed manner,

[0046] FIG. 4 shows an isometric front view of a formwork skin of the formwork element illustrated in FIG. 3,

[0047] FIG. 5 shows an isometric rear view of a formwork arrangement which is assembled from the two formwork elements illustrated in FIGS. 1 to 4, wherein the formwork element which has four struts within its frame is arranged in a vertical position,

[0048] FIG. 6 shows an isometric rear view of a further formwork arrangement which is assembled from the two formwork elements illustrated in FIGS. 1 to 4, wherein the formwork element which has four struts within its frame is arranged in a horizontal position,

[0049] FIG. 7 shows a partly cut-away isometric rear view of one of the formwork elements illustrated in the previous figures,

[0050] FIG. 8 shows a detail view in a sectional illustration of two formwork elements which are held together with a connection clamp, and

[0051] FIG. 9 shows a basic diagram analogous to FIG. 8, wherein the formwork elements are held together with a plug-through bolt.

DETAILED DESCRIPTION

[0052] In the following description of various embodiments of the invention, elements which correspond in their function are given corresponding reference numbers even where their configuration or design possibly differs from one another.

[0053] All of the figures each show formwork elements designated overall by 1. Each of the formwork elements 1 has a formwork skin 2, a frame 3 bearing the latter, and struts 4 which are arranged within the frame 3 and support the formwork skin 2.

[0054] In all of the embodiments of formwork elements 1 which are shown in the figures, the frames 3 are each produced from flat steel. The struts 4 of the formwork elements 1 shown are for their part produced from open, symmetrical sectional steel. Thus, by virtue of their profiled cross section, the struts 4 of the formwork elements 1 obtain a higher stiffness, in relation to the material used for producing the struts 4, than those struts which are used in previous formwork elements and are produced from unprofiled flat steel. This higher stiffness of the struts 4 on the one hand favors a higher overall stiffness and hence also a higher loadability of the respective formwork element 1. On the other hand, through the use of struts 4 which are produced from steel profiles, the formwork element 1 has a particularly low overall weight in relation to its loadability and stability. This promotes the simplified handling of the formwork element 1.

[0055] The sectional steel of the struts 4 is open to the formwork skin 2 of the respective formwork element 1. In particular, the sectional illustration according to FIG. 7 further shows that the sectional steel used for the struts 4 is or has a hat profile. The struts 4 thus have support surfaces 16 by which they bear flat against the formwork skin 2. The formwork skin 2 is fastened by rivets 15 to the struts 4. The sectional steel of the struts 4 additionally has, on its head side 13, two longitudinal beads 14 which are oriented parallel to one another. A fastening element which is not shown in the figures, for example an anchor, can engage behind these longitudinal beads 13 and in this way be secured to the struts 4 in a rotationally fixed manner.

[0056] Each of the formwork elements 1 shown has an even number of struts 4 within its frame 3. At least two outer struts 4a and 4b of these struts 4 are each equipped with a plurality of plug-through openings 5, 6 and 7 for anchors which are not shown in the figures.

[0057] In the case of the formwork elements 1 shown in the figures, there is even provision that all of the struts 4 each have at least two plug-through openings 5, 6 and/or 7. Here, a shortest distance between a first plug-through opening 6 of the at least two plug-through openings 5 and the frame 3 of the respective formwork element 1 is shorter than a shortest distance between a second plug-through opening 7 of the at least two plug-through openings and the frame 3.

[0058] In the exemplary embodiment of a formwork element 1 that is shown in FIGS. 1 and 2, a total of four struts 4 are arranged within the frame 3. In the exemplary embodiment of a formwork element 1 that is shown in FIGS. 3 and 4, a total of two struts 4 are arranged within the frame 3.

[0059] All of the struts 4 are oriented parallel to one another and moreover spaced uniformly apart from one another within the respective frame 3. Here, the respective second plug-through opening 7 is identically spaced apart from two mutually adjoining frame legs 8 and 9 of the frame 3.

[0060] Particularly the sectional illustration of the formwork element 1 according to FIG. 7 illustrates that the struts 4 consist of trapezoid profiles. At least the formwork element 1 shown in FIGS. 1 and 2 has a frame 3 which has a side ratio of 3 to 5.

[0061] Each of the formwork elements 1 further has additional struts 10. These are arranged transversely, more precisely at right angles, to the struts 4 of the respective formwork element 1. Furthermore, a holding opening 11 is formed in each of these additional struts 10. The holding openings 11, which each of the formwork elements 1 has, simplify the handling of the formwork elements 1. The holding openings 11 allow the manual transport of the formwork element 1 by two persons.

[0062] There are additionally provided stiffening elements 12 between adjacent frame legs 8 and 9 of the frame 3 of the respective formwork element 1.

[0063] In particular, the inner plug-through openings 5, 6, 7 take the form of oblong holes, which can facilitate the insertion of anchor bars or concrete anchors.

[0064] FIG. 6 illustrates that the struts 4 of the square formwork element 1 arranged on the left-hand side are arranged in such a way that the plug-through openings 5, 6 formed therein are aligned with the second plug-through openings 7 in the struts 4 of the second, rectangular formwork element 1.

[0065] All of the figures which relate to a rectangular formwork element 1 illustrate that the struts 4 of these rectangular formwork elements 1 are oriented along a short side of a rectangular basic shape of the frame 3 of the respective formwork element 1.

[0066] FIGS. 5 and 6 also serve to illustrate a formwork construction kit which comprises at least two types of different formwork elements 1 of the above-described type. As FIGS. 5 and 6 show, the formwork construction kit allows a variable configuration of a formwork formed from the formwork elements 1.

[0067] FIG. 8 shows the connection of two formwork elements 1 by means of a connection clamp 20. For this purpose, the frame has connection openings 18, 19 punched therein in which holding projections 22 and clamp arms 21 of the connection clamp 20 engage. Here, the holding projections 22 are dimensioned and arranged on the clamp arms 21 in such a way that they engage—in a practically play-free manner at least along the clamp arms 21—in the connection openings 18, 19 in order to orient the formwork elements 1 relative to one another.

[0068] There are two types of connection openings 18, 19 formed here.

[0069] The connection openings 18 (cf. FIG. 7) of the first type are configured as oblong holes, with the result that play-free fixing occurs only transversely to the formwork skins 2, that is to say in the transverse direction or narrow direction of the oblong hole.

[0070] The connection openings 19 (cf. FIG. 7) of the second type are, by contrast, configured as round holes (with cutouts for wings 24 of plug-through bolts 23, as will be explained more precisely further below). The round holes have the effect that the formwork elements 1 are also oriented along the frame 3 close to the connection openings 19, since the plug-through bolts 23 or the holding projections 22 are completely fixed.

[0071] Overall, it can be seen that the frame 3, on its inner side 17, is formed without projections and from planar unprofiled flat steel.

[0072] The punched connection openings 18, 19 here form undercuts on which the connection clamp 20 can engage in order not to slide off.

[0073] FIG. 9 shows an alternative type of connection of two formwork elements 1. Here, a plug-through bolt 23, the diameter of which can be equal to the diameter of the holding projections 22, is plugged through one of the two connection openings 18, 19. Here, the wings 24 are dimensioned in such a way that they fit both through the cutouts 25 of the round hole and through the oblong hole. After being rotated through 90°, the plug-through bolts 23 are then fixed.

[0074] In order to ensure the freedom of play transversely to the formwork skin 2, a clear width of the different connection openings 18, 19 transversely to the formwork skin 2 corresponds.

[0075] By contrast, a space for placing the holding projections 22 in the connection opening 18, 19 in the case of the oblong hole, that is to say the connection opening 18, along the formwork skin 2 is larger than in the case of the round hole of the connection opening 19.

[0076] It can also be seen from the figures that the struts 4 are formed identically to one another within a formwork element 1.

[0077] A comparison of FIGS. 1 to 6 reveals that, in the formwork element 1 from FIG. 2, there are formed two intersecting lines of plug-through holes 5, 6, 7. Thus, the plug-through holes 7 form a vertical line and the plug-through holes 6 form two horizontal lines (with further plug-through holes) which each cross or intersect the vertical line.

[0078] The height of these lines above the edge by which the formwork element 1 is placed on a base or set-up surface is here chosen to be correspondingly equal and corresponds with a height of a corresponding line on the formwork element 1 according to FIG. 4. With two formwork elements placed next to one another, there thus results, independently of their spatial orientation, a horizontal line on which the anchor bars lie.

[0079] The invention is concerned with improvements in the technical field of concrete formwork construction. What is proposed as an improvement is, inter alia, the formwork element 1 whose frame 3 is produced from flat steel, whereas the struts 4 of the formwork element 1 consist of sectional steel.

LIST OF REFERENCE SIGNS

[0080] 1 Formwork element

[0081] 2 Formwork skin

[0082] 3 Frame

[0083] 4 Strut

[0084] 4a Outer strut

[0085] 4b Outer strut

[0086] 5 Plug-through opening

[0087] 6 First plug-through opening

[0088] 7 Second plug-through opening

[0089] 8 Frame leg

[0090] 9 Frame leg

[0091] 10 Additional strut

[0092] 11 Holding opening

[0093] 12 Stiffening element

[0094] 13 Head side

[0095] 14 Longitudinal bead

[0096] 15 Rivet

[0097] 16 Support surface

[0098] 17 Inner side

[0099] 18 Connection opening (first type)

[0100] 19 Connection opening (second type)

[0101] 20 Connection clamp

[0102] 21 Clamp arm

[0103] 22 Holding projection

[0104] 23 Plug-through bolt

[0105] 24 Wing