EP2977526B1 - Fastening bracket for ceiling edge formwork - Google Patents

Description

The invention relates to a mounting bracket for Deckenrandabschalungen according to the preamble of claim 1.

Fixing brackets, also called Abschalwinkel, are used for attaching Abschalbrettern or lost formwork for attaching formwork, which remain after concreting the ceiling in the building. The mounting brackets are usually attached to the slab formwork with nails, then the shuttering is also attached with nails to the mounting brackets. The fixing brackets are embedded in the concrete mass for the ceiling and are then no longer visible.

The known Abschal- or mounting bracket are made of steel or plastic. Since the construction is purchased very cost-conscious and steel angles are more expensive than those made of plastic, therefore, various versions of plastic angles are known. These include a base leg, which in spaced to the Deckenabschalung comes to lie and at right angles to a bracket on which so-called nail loops, ie small spacers are formed, which ensure a distance between the board and the holding leg. Through the nail loops, the nails are passed, with which the board is attached to the spacer. Since plastic angles must also have a certain minimum rigidity in order to be able to absorb the forces of the liquid concrete mass without the shut-off plate tilting outwards, precautions must be taken to ensure high rigidity. On the one hand, it is possible to use plastic materials that meet these requirements. These are very expensive and therefore not accepted by the customers. Further, it is possible to increase the strength of the plastic angle in other ways, even if it consists of very inexpensive material. All these measures, with the exception of expensive plastic products, can not yet meet the requirements for strength (deflection). Such a solution is for example from the EP 1 672 141 A1 known. In this known font, as well as in the US 5,788,875 The horizontally lying base leg adjoins a rectangular tube. In the first case, no strut extending into the rectangular tube is designed as a reinforcement; in the second case, the Side wall of the existing plastic rectangular tube partially pulled into the base leg, which causes an increase in consumption of plastic and thus additional costs. In both writings, no stiffening elements resting laterally on the base and holding legs are disclosed. In addition, in both documents, the so-called needle loops are one above the other and are not offset laterally, so that liquid concrete can flow from top to bottom between the formwork and the holding leg down.

It is therefore an object of the present invention to provide a mounting bracket, the rigidity of which, despite the use of inexpensive plastic meets all strength requirements.
Another object of the present invention is to design the mounting bracket such that its rigidity can be adapted to the requirements of the respective ceiling construction. Another object is to make the mounting bracket easier by appropriate design measures, ie to be able to produce less plastic in order to reduce its manufacturing costs, without reducing the rigidity.

These objects are achieved by a mounting bracket with the features of the claim 1. Advantageous embodiments of the mounting bracket are described in the dependent claims.

Due to the novel design of the truss structure between the upper and lower cover plate of the base angle and the connection between the base angle and / or the bracket, the bending stiffness of the base leg and the entire angle can be significantly increased. With one or two additional reinforcing and stiffening elements, which can be laterally connected without tools to the mounting bracket or injected into the mounting bracket, the flexural rigidity can be significantly increased according to the craftsman's desire and adapted to the respective requirements. The stiffness then surpasses the values of more expensive full metal angles.

The novel design of the nail loops on the holding leg allows a saving of plastic and also favors very much the flow of liquid concrete between the formwork and the mounting bracket. Thus, this gap can be completely backfilled with concrete. As a result, the visible after stripping surface of the ceiling edge is not only visually, but also mechanically flawless and when loaded the angle, this acts the breaking of the Ceiling forehead between the angle and the surface.

Figur 1

einen Befestigungswinkel in perspektivischer Darstellung ohne Versteifungswinkel,

Figur 2

eine perspektivische Darstellung des Befestigungswinkels von der anderen Seite mit einer zusätzlichen Versteifungsplatte,

Figur 3

eine perspektivische Ansicht des Befestigungswinkels von unten und

Figur 4

eine perspektivische Darstellung des Befestigungswinkels ohne Versteifungsplatte, jedoch mit zwei Verlängerungsaufsätzen auf dem Halteschenkel,

Figur 5

einen Vertikalschnitt durch eine Wand, eine Deckenschalung und einem auf der Deckenschalung aufgenagelten Befestigungswinkel.

Reference to an illustrated embodiment, the invention is explained in detail. Show it:

FIG. 1

a mounting bracket in perspective view without stiffening angle,

FIG. 2

a perspective view of the mounting bracket from the other side with an additional stiffening plate,

FIG. 3

a perspective view of the mounting bracket from below and

FIG. 4

a perspective view of the mounting bracket without stiffening plate, but with two extension attachments on the support leg,

FIG. 5

a vertical section through a wall, a slab formwork and a nailed to the slab formwork angle bracket.

The in FIG. 1 designated by reference numeral 1 attachment or Abschalwinkel, short angle called 1, comprises a base leg 3 and a holding leg 5. The two legs 3, 5 are connected to each other such that the bearing surfaces 7 on the base leg in stand a right angle to the holding leg or to the end faces of the holding leg 5 attached nail loops 9.

The base leg 3 comprises a lower cover plate 11 and an upper cover plate 13. At the lower cover plate 11 feet 15 are formed, which form the support surface 7 on the formwork. Between the two in the example slightly conical cover plates 11 and 13, a framework is formed, which is formed by roof-like strut pairs 17 and 19 and optionally additional vertical support 21. The roof-like two pairs of struts 17, 19 are either ever parallel or at a very acute angle. The apex S of the upper strut pair 17 is connected to the upper cover plate 13; the lower edges of the upper strut pair 17 are connected to the lower cover plate 11. The apex of the lower strut pair 19 is spaced from the apex of the upper strut pair 17 and is connected to the vertical support 21.

Alternatively, the vertexes of both strut pairs 17, 19 meet at the upper cover plate 13 and are connected there directly to the cover plate 13. In the in FIG. 1 illustrated first embodiment, the two legs of the upper strut pair 17 meet with the upper cover plate 13 at a tubular node 55th

In a further embodiment of the invention, the one or more struts 17, 19, which of the upper cover plate 13th lead to the holding leg 5, also omitted or replaced by a differently constructed framework. There then remain one or two struts, which extend directly from the cover plate 13 or slightly spaced therefrom, for example tied to the vertical support 21, in the direction of the free end of the base leg 3.

The free end of the base leg 3 may have a taper 4, on which an extension element, which is not shown in the figures, can be placed. On the extension element 4, a foot 15 is also formed on the lower surface thereof.

One of the feet 15 is preferably below the apex of the pairs of struts 17, 19 or if only one extending to the free end of the base leg 3 strut is present below the upper connection to the upper cover plate thirteenth

The base leg 3 extends - in contrast to the known mounting brackets - back preferably to the outer surface 23 of the retaining leg 5, on which the nail loops 9 are formed. The connecting region between the base leg 3 and retaining leg 5 is carried out by again roof-like arranged first and second auxiliary struts 25 and 27, wherein the apex of which is connected to the inner surface 29 of the retaining leg 5. The whole front part of the base leg 3 is thus at Support or attachment point suspended on the slab formwork 57 (see FIG. FIG. 5 ).

In the truss on the base leg 3, for example, mushroom-shaped pins 31 are formed laterally, which are radially inwardly deformed by crosswise incisions. The pins 31 may be formed by cylindrical thickening of the pairs of struts 17 or another pair of struts and project beyond this. As an alternative to the pins 31, differently shaped locking elements may also occur.

The lower and the upper cover plate 11, 13 have, in an advantageous embodiment, a greater width b than the width of the at least one strut 17 and / or 19 of the truss. This measure makes it possible between the two cover plates 11, 13 play a stiffening plate or a stiffening angle 33 made of steel, preferably made of high-strength steel, plastic or other material, insert. At the stiffening angle 33 3 holes are provided according to the arrangement of the pins 31 on the base leg, passed through the pins or locking elements 31 and engage after complete pressing of the stiffening angle 33 to the struts 17, 19. This results in a substantial increase in the already existing high rigidity of the base leg 3. Analogously, the outer surface 23 and the inner surface 29 of the retaining leg 5 protrude beyond the side surfaces 35. The intervening space is when clipping one or two Stiffening angle 33 filled. There, too, the stiffening angle 33 is therefore held substantially free of play and is held insoluble by also existing pin 31. The latching means 31 are arranged offset on the two side surfaces and offset staggered in the stiffening angles in each case two holes. As a result, the angle 1 can be packed together side by side for transportation.

The nail loops 9, in the present example according to FIG. 5 five in number, are not as in the prior art in pairs and often also interconnected side by side, but each offset by half of the distances. This allows an unobstructed zig-zag flow of the liquid concrete between a formwork board, against which the nail loops 9 and the outer surface 23 of the holding leg 5. This results in a smooth pore-free concrete surface in the visible ceiling edge. In order to further favor the concrete flow, the tubular portions 37 of the nail loops 9, which are connected via triangular or trapezoidal tabs 39 on the outer surface 23 of the retaining leg 5, not perpendicular to the longitudinal extent of the retaining leg, but at an angle of for example 30 ° 45 ° inclined to it. The liquid concrete can therefore flow unhindered zigzag down. This further causes a better Einbetonieren the angle 1, a more homogeneous surface and thereby additionally prevents the breaking out of the ceiling forehead under load of the angle. 1

At the lower end of the outer surface 23, a fin 41 may be formed, the outer edge 43 is in the common plane of the end faces 45 of the nail loops 9. A perforation 47 extending at an angle to the underside of the base leg 3, which serves as a predetermined breaking line, makes it possible to detach a triangular corner piece 49 from the fin 41, e.g. cancel. This makes it possible to insert a triangular lath to produce a chamfer at the corresponding ceiling angle at the bottom of the finished ceiling.

The upper end of the retaining leg 5 has a smaller cross section over a portion, which allows the pushing on of an extension cap 53. This allows the installation of clamping Deckenrandabschalungs-systems, with which a formwork panel 67 can be held during the casting of the ceiling from the outside. It can also be put on a railing post.

In the FIG. 4 are on the retaining leg 5 two essays 53 attached, which also have nail loops 9, so that even in the extended region of the retaining leg. 5 the same distance between the holding leg 5 and a shuttering plate 67 is ensured.

In order to give the desired strength to one or at most two attachments 53 on the upper end of the holding leg 5, the stiffening angle 33 can be extended at the stiffening angle 33 of the holding leg 5 so that it projects into one or at most two attachments 53 and thus significantly increases their flexural strength.

In the schematic representation according to FIG. 5 is the mounting bracket 1 on the slab formwork 57, which is supported by a ceiling support 59, attached. The attachment via nails 61, which have been driven from above through the base leg 3 in the formwork 57. Like from the FIG. 5 It can be seen that often not all feet 15 are on the formwork 57, in particular not on the upper edge 63 of a wall 65, since the latter is usually not aligned with the surface of the formwork 57 or is not flat in a cast wall. The foot 15 under the retaining leg 5 and possibly also the adjacent base leg 3 therefore find no support. In dash-dotted lines a Deckenrand-Abschalplatte 67 is indicated to illustrate the situation.

From the schematic representation in FIG. 5 It is clear how the forces within the mounting bracket 1 run when the base leg 3 is not fully supported over its entire length. In particular, it will be seen that the horizontal forces on the ceiling edge peel plate 67, created by the pressure of the liquid concrete above the formwork 57, require the mounting angles to flex (clockwise). This stress is optimally absorbed by the inventive mounting bracket 1.

In the Figures 2 and 3 On the upper cover plate 13, for example, cylindrical projections 69 and on the lower cover plate 11 tubular projections 71 or a foot 15 with a bore 73 are formed. The projections 69 and the tubular projections 71 or holes 73, allow the stacking of the mounting bracket 1 for storage and transport, without the mounting bracket 1 must be placed in boxes or other containers. The mounting bracket 1 can be transported in a cost effective manner and with minimal waste held together by strapping.

Legend of the reference numbers

1

mounting brackets

3

base leg

4

rejuvenation element

5

holding leg

7

Support surface (n)

9

nail loop

11

lower cover plate

13

upper cover plate

15

feet

17

pursuit

19

pursuit

21

carrier

23

outer surface

25

assist struts

27

assist struts

29

palm

31

spigot

33

reinforcing angles

35

side surface

37

tubular sections

39

tabs

41

fin

43

outer edge

45

face

47

perforation

49

corner

51

upper end of 5

53

extension top

55

node

57

formwork

59

support

61

nail

63

top edge

65

wall

67

Ceiling edge Abschalplatte

69

head Start

71

tubular projection

73

drilling

Claims (14)

1. A fastening bracket (1) for ceiling edge formwork, comprising a base limb (3) for securing onto a ceiling formwork (57), a retaining limb (5) arranged at right angles to the latter for securing a ceiling edge formwork panel (67) as well as nail clamps (9) arranged on the retaining limb (5) for mounting the ceiling edge formwork panel (67) at a distance, wherein the base limb (3) has an upper and a lower cover plate (13, 11), between which a framework is formed and on the retaining limb (5) a plurality of nail clamps (9) are arranged, characterised in that
   the nail clamps (9) are arranged alternately on the left and right on the retaining limb (5) and their nail guiding bushes (37) are joined by triangular or trapezoidal tabs (39) to the outer surface (23) of the retaining limb (5), and in that the tabs (39) are arranged at an acute angle in longitudinal extension relative to the retaining limb (5) in order to direct the liquid concrete downwards in a zig-zag manner.
2. The fastening bracket (1) for ceiling edge formwork according to claim 1, characterised in that in the corner connecting area between the two limbs (3, 5) a fin (41) is formed which protrudes perpendicularly from the outer surface (23).
3. The fastening bracket (1) for ceiling edge formwork according to claim 2, characterised in that on the fin (41) an equilateral or non-equilateral triangular corner piece (49) is formed which can be broken off along a perforation line (47), so that after the corner piece (49) has been broken off the fin (41) has an angled edge for inserting a triangular strip.
4. The fastening bracket for ceiling edge formwork according to any one of the preceding claims, characterised in that the upper cover plate (13) and the lower cover plate (11) are joined together by means of at least one strut (17), such that the lower end of the strut (17) is connected in the region of the free end of the base limb (3) to the lower cover plate (11) and the upper end of the strut (17) in the middle of the base limb (3) is joined to the upper cover plate (13) directly or indirectly.
5. The fastening bracket according to claim 4, characterised in that the struts (17, 19) forming the framework are arranged between the two cover plates (11, 13) of the base limb (3) in the manner of a roof and/or lying above one another.
6. The fastening bracket according to any one of claims 4 or 5, characterised in that the upper ends of the struts (17, 19) are connected to a web (21) connecting the bottom and the top cover plate (11, 13) perpendicular to the bottom cover plate (11).
7. The fastening bracket according to any one of claims 4 to 6, characterised in that the struts or pairs of struts (17, 19) meet on a line or at a tubular node point (55).
8. The fastening bracket according to any one of claims 4 to 7, characterised in that one of the feet (15) supporting the base limb (3) is arranged below the upper end of the struts (17, 19).
9. The fastening bracket (1) for ceiling edge formwork according to any one of claims 4 to 8, characterised in that in the corner connecting area of the base limb (3) to the retaining limb (5) a first auxiliary strut (25) crossing the struts (17, 19) is formed.
10. The fastening bracket (1) for ceiling edge formwork according to any one of claims 4 or 5, characterised in that the framework extends over the base limb (3) below the retaining limb (5) and the bottom end of the retaining limb (5) is arranged at the level of the upper cover plate (13) and is connected to the latter and/or in that in addition to a first auxiliary strut (25) a second auxiliary strut (27) leads roof-like from the upper end of the first auxiliary strut (25) to the transition of the outer surface (23) of the retaining limb (5) with the lower side of the support limb (7).
11. The fastening bracket (1) for slab edge formwork according to any one of the preceding claims, characterised in that at least on the base limb (3) and/or on the holding leg (5) a reinforcing element (33) is arranged.
12. The fastening bracket (1) for slab edge formwork panels (67) according to claim 11, characterised in that the reinforcing element (33) on the base limb (3) is inserted between the areas of the two cover plates (11, 13) projecting laterally over the framework.
13. The fastening bracket (1) for ceiling edge formwork according to any one of claims 11 or 12, characterised in that the at least one reinforcing element (33) can be fitted without tools onto locking elements (31) on the fastening bracket (1) and is held in a non-detachable manner.
14. The fastening bracket according to claim 10, characterised in that the reinforcing element (33) comprises an L-shaped bracket made of steel, plastic or another material and/or in that the reinforcing element (33) is made of different plastic materials during the manufacture of the fastening bracket (1).

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