Frame structure for a formwork panel

Abstract

A support structure for a formwork panel having a support structure and a formwork skin positioned on the front of the support structure and attached to the support structure, wherein the support structure has at least one edge girder on a pair of opposite edges and a plurality of transverse girders between these two edge girders which run transversely to these two edge girders, characterized in that at least some of the transverse girders are designed as a profile girder, comprising a flange at its first end arranged at the front of the support structure, a tubular hollow section at its second end away from the front of the support structure, and between them a preferably wall-like member connecting the first end and the second end.

Claims

1. A support structure for a formwork panel, comprising: a pair of oppositely arranged edge girders; and a plurality of transverse girders between the edge girders which run transversely to the edge girders, wherein at least some of the transverse girders are designed as a profile girder, comprising a flange at a first end arranged at a front of the support structure, a tubular hollow section having a substantially circular cross-section at a second end away from the front of the support structure, and a wall-like member, between the flange and the tubular hollow section, connecting the first end and the second end, wherein the at least one profile girder has a finger hole in the member or a plurality of finger holes over the length of the profile girder.

2. The support structure according to claim 1, wherein the at least one profile girder is an extruded profile made of aluminum.

3. The support structure according to claim 1, wherein the finger hole, or the finger holes, is or are elongated in the longitudinal extension direction of the profile girder and is or are delimited on the side adjacent to the hollow section by the hollow section for a large part of its or their length.

4. The support structure according to claim 1, wherein the at least one profile girder has a flange projecting on both sides of the member.

5. The support structure according to claim 1, wherein the flange has, at its projecting end, or its projecting ends, a projection which increases the thickness of the flange, with the projection projecting forward towards the front of the support structure and/or backward towards the rear of the support structure.

6. The support structure according to claim 1, wherein the member has a thickness in the range 0.8 to 2.5 mm or in the range 0.8 to 2.0 mm.

7. The support structure according to claim 1, wherein the member has a height in the range 50 to 110 mm.

8. The support structure according to claim 1, wherein the flange has a width in the range 15 to 40 mm.

9. The support structure according to claim 1, wherein the hollow section, measured outside and perpendicular to the central plane of the member, has a thickness in the range 15 to 30 mm.

10. The support structure according to claim 1, wherein the wall thickness of the hollow section is 0.95 to 1.2 times the wall thickness of the member.

11. The support structure according to claim 1, wherein the thickness of the flange, is 0.7 to 1.2 times the wall thickness of the member.

12. The support structure according to claim 1, further comprising: a pair of transverse edge girders, each extending transversely to the pair of oppositely arranged edge girders.

13. A formwork panel, comprising: the support structure according to claim 1; and a formwork skin attached to the support structure at the support structure front side.

14. The support structure of claim 1, wherein a wall thickness of the hollow section is 0.95 to 1.2 times a wall thickness of the wall-like member.

15. The support structure according to claim 6, wherein the thickness of the flange, excluding the projection, is 0.7 to 1.2 times the wall thickness of the member.

16. A support structure for a formwork panel, comprising: a pair of oppositely arranged edge girders; and a plurality of transverse girders between the edge girders which run transversely to the edge girders, wherein at least some of the transverse girders are designed as a profile girder, comprising a flange at a first end arranged at a front of the support structure, a tubular hollow section at a second end away from the front of the support structure, and a wall-like member, between the flange and the tubular hollow section, connecting the first end and the second end, wherein at least one of: the member has a thickness in the range 0.8 to 2.5 mm or in the range 0.8 to 2.0 mm, the member has a height in the range 50 to 110 mm, the flange has a width in the range 15 to 40 mm, the hollow section, measured outside and perpendicular to the central plane of the member, has a thickness in the range 15 to 30 mm, or the wall thickness of the hollow section is 0.95 to 1.2 times the wall thickness of the member.

17. A support structure for a formwork panel, comprising: a pair of oppositely arranged edge girders; and a plurality of transverse girders between the edge girders which run transversely to the edge girders, wherein at least some of the transverse girders are designed as a profile girder, comprising a flange at a first end arranged at a front of the support structure, a tubular hollow section having a substantially circular cross-section at a second end away from the front of the support structure, and a wall-like member, between the flange and the tubular hollow section, connecting the first end and the second end, wherein a wall thickness of the hollow section is 0.95 to 1.2 times a wall thickness of the wall-like member.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention and more specific embodiments of the invention are explained in more detail below on the basis of exemplary embodiments illustrated in the drawings. The figures show the following:

(2) FIG. 1 a support structure for a formwork panel, in a perspective representation and looking obliquely onto its rear side;

(3) FIG. 2 one of the transverse girders of the support structure of FIG. 1, in a perspective representation looking obliquely onto its front side;

(4) FIG. 3 the transverse girder of FIG. 2, in the cross-section or front view and on a larger scale;

(5) FIG. 4 a modified transverse girder cross-section.

DETAILED DESCRIPTION

(6) The support structure shown in FIG. 1 has two longitudinal edge girders 4, two transverse edge girders 6 and seven transverse girders 8 distributed over the length of the support structure 2 (which, when taking the transverse edge girders 6 into account, are “transverse intermediate girders”). The transverse girders 8 extend from one longitudinal edge girder 4 to the other longitudinal edge girder 4 in an orientation perpendicular to the longitudinal edge girders. The transverse girders 8 are each welded to the two longitudinal edge girders 4. The transverse edge girders 6 also extend from one longitudinal edge girder 4 to the other longitudinal edge girder 4 in a direction perpendicular to the longitudinal edge girders 4 and are welded to the longitudinal edge girders 4 at the four corners of the support structure 2.

(7) All of said girders 4, 6, 8 are made of aluminum.

(8) If a formwork skin is placed on the drawn support structure 2 on its front side (this is the side farther from the viewer of FIG. 1) and fastened to the support structure 2, the result is a frame formwork panel. The drawing of FIG. 1 then looks unchanged because the edge girders 4 and 6 each have an outer, forward-drawn edge so that these four edges cover the four corners of the plate-like formwork skin.

(9) The seven transverse girders 8 all have the same configuration as shown in FIG. 2. The transverse member 8 shown in FIG. 2 is a profiled girder having a flange 10 on the front, a tubular hollow section 12 on the rear and a wall-like member 14 in-between. The flange 10 projects on both sides of the member 14 and is symmetrical to the central plane of the member 14. In the two longitudinal end sections of the profile girder 8, the flange 10 and the front edge of the member 14 are removed a little so that the profile girder 8 fits well into the profile of the longitudinal edge girder 4.

(10) FIG. 3 shows the cross-section of the profile girder 8 on a larger scale. The profile girder 8 is symmetrical to its longitudinal center plane 16, which runs in the middle of the member 14 from the flange 10 to the hollow section 12. The profile girder 8 is an extruded part made of aluminum. The same applies to the longitudinal edge girders 4 and the transverse edge girders 6. The cross-section of the hollow section 12 is circular on the outside (with the exception of the transition to the member 14) and circular on the inside. The member 14 is a narrow rectangle in the cross-section. In the cross-section, the flange 16 is a narrow rectangle (which is perpendicular to the member 14), each having a projection 18 at the left end of the flange 10 in FIG. 3 and at the right end of the flange 10 in FIG. 3. The projections 18 increase the flange thickness there. In FIG. 3, the projections project downwards, i.e., towards the rear in relation to the overall support structure or towards the rear of the support structure 2. In the modification of the profile girder 8, as shown in FIG. 4, the two projections 18 project forward instead.

(11) The profile girder 8 has the following dimensions in the embodiment shown: Thickness of the member 14: 1.6 mm; Height of member 14 measured from the hollow section 12 to the flange 10: 73 mm; Width of the flange 10 in FIG. 3: 25 mm; Outer width of the hollow section 12 in FIG. 3: 20 mm; Wall thickness of the hollow section 12: 1.7 mm.

(12) It is emphasized that the front surfaces 20 of all flanges 10 of all transverse girders 8 are located in the same plane as the contact surfaces of the longitudinal edge girders 4 and the transverse edge girders 6 so that a formwork skin attached to the support structure 2 is supported evenly by all the girders 4, 6, 8.

(13) The formwork skin may be fastened, for example with rivets, which are fastened to the support structure 2 by the formwork skin and by the areas of the flanges 10 located between the two projections 18. The type of configuration of the projections 18 shown in FIG. 4 creates a wide groove 22 at the front of the flange 10. It is possible to apply an adhesive layer there to adhere the formwork skin to the transverse girders 8.

(14) FIGS. 1 and 2 show that each profile girder 8 has two finger holes 24 which are elongated in the longitudinal direction of the profile girder 8 and both have the same configuration. The circumferential line of the respective finger hole 24 is rectilinear for almost the entire length of the finger hole and closely adjacent to the line where the outer circumference of the hollow section 12 leads away from the member 14. The front of the circumferential line 26 is curved with a large radius so that the respective finger hole 24 is higher in the middle than at a distance from the center. At the ends of the respective finger hole 24, the rear, rectilinear part and the front, curved part of the contour line 26 substantially merge into one another with essentially circular-arc-shaped sections. Overall, the respective finger hole 24 is so large that a person handling the support structure 2 or the formwork panel produced therewith can comfortably pass one hand through the finger hole 24 and grasp the hollow section 12 with the thumb and fingers. The center of each finger hole 24 is spaced approximately 20% of the length of the profile girder 8 from the adjacent end of the profile girder 8.

(15) FIG. 1 shows that also the longitudinal edge girder 4 and the transverse edge girder 6 each have various holes 24. Some of the holes 24 are finger holes. Other holes 24 are provided for other purposes. The longitudinal edge girders 4 and the transverse edge girders 6 all have the same cross-sectional shape but differ from the cross-sectional shape of the transverse girders 8.