EP0880626B1 - Formwork element - Google Patents

Abstract

Formwork element with a wall (10) of perforated metal characterized by an alternating series of parallel strips of expanded metal (12) and solid sheet metal (14) connected to one another as a single piece.

Description

The invention relates to a formwork element in the form of a quiver with a Openwork metal wall panel. Such formwork elements are used for lost concrete formwork used, for example as quiver formwork, such as is described in DE-U-94 06 373.

In the formwork elements described in the above-mentioned document the wall panel is formed by preferably profiled perforated plate.

On the other hand, it is known from EP-A-0 560 308, for example, the wall panel made of expanded metal. Expanded metal as such is less expensive than Perforated sheet and also has the advantage that better interlocking between the blackboard and the concrete is reached. The disadvantage, however, is that blackboards, which are made entirely of expanded metal and have only low inherent rigidity and therefore have to be additionally stiffened. Also through profiling the expanded metal panels can hardly achieve the required rigidity. For this reason, the expanded metal panels in the known formwork elements stiffened by welded metal round rods. However, this leads at a considerably higher production cost and thus at higher costs.

From WO-A-9105121 a steel / concrete composite structure is known, in which the Steel element is a profiled plate, which is made of alternating strips of solid sheet metal and expanded metal. The solid sheet strips are rib-like Stiffening profiles shaped that the plate in the direction transverse to the direction of travel the strips give a high degree of flexural rigidity.

The object of the invention is to provide a formwork element, in particular in the form of a quiver for quiver formwork, which is inexpensive to manufacture. results in good interlocking with the concrete and is still very stable.

This object is achieved with the features specified in claim 1.

With this solution, the wall panel of the formwork element is replaced by an alternating one Follow parallel, one-piece strips Expanded metal and solid sheet formed.

Expanded metal sheets are usually produced in one cycle working machine, which has a series of slots in it every working cycle Sheet metal punches and the material then stretches so that a row of stitches is formed becomes. The material is then transported on until the next cycle begins. The wall panel of the formwork element according to the invention can just create yourself, each time after a certain number of steps the material is transported further without punching and stretching, so that you get a solid sheet strip in the desired width. With that The panel made of expanded metal and solid sheet run as a result perpendicular to the direction of stretch of the expanded metal.

Form the strips of solid sheet that are worked into the wall panel in this way an integrated stiffening which increases the stability of the wall panel without additional stiffening elements having to be welded on. Ensure the strips of expanded metal between the solid sheet strips good interlocking with the concrete.

Even a wall panel profiled in the running direction of the strips can be used with a suitable one Select the profile in the direction perpendicular to the running direction. According to the wall panel has an approximately trapezoidal profile which the solid sheet strips are not or only weakly profiled and the base sides of the trapezoids form, while the expanded metal the oblique flanks of the Trapeze forms. If the blackboard is then bent perpendicular to the direction of the profile or is folded, the solid sheet strips only set one relative to the deformation little resistance. The inside with respect to the bending curvature Solid sheet strips are subjected to pressure when bending or edging and dodge outwards so that they are bent relatively sharply, while the outer solid sheet strips are bent more gently. The Expanded metal allows the balance between the different deformations the solid sheet strip. In this way, the blackboard can be added to the bend quiver according to the invention.

Since the wall material can be folded despite the profiling without The quiver points out that recesses must be provided on the bending lines high stability at the edges. It is therefore easily possible To bring quiver into a flat state for transportation purposes by diamond-shaped pressed together from two diagonally opposite corners becomes. At the construction site, the quiver is then loaded back into the ready-to-use Reshape condition. This process can even be repeated can be repeated without causing excessive material fatigue comes at the bend lines.

A special embodiment of the invention results from the subclaim.

The following are preferred exemplary embodiments with reference to the drawing explained in more detail.

Fig. 1

einen Ausschnitt aus einem Schalungselement in der Form einer flachen Wandtafel;

Fig. 2

eine perspektivische Ansicht eines Schalungselements in der Form eines Köchers;

Fig. 3 bis 5

Beispiele für unterschiedliche Profilierungen des Schalungselements; und

Fig. 6

einen Grundriß eines Köchers in einem flachgelegten Transportzustand.

Show it:

Fig. 1

a section of a formwork element in the form of a flat wall panel;

Fig. 2

a perspective view of a formwork element in the form of a quiver;

3 to 5

Examples of different profiles of the formwork element; and

Fig. 6

a floor plan of a quiver in a flat transport condition.

The formwork element shown in Figure 1 has the shape of a flat wall panel 10, which is made in one piece from a single-layer steel sheet, the one Has thickness of 1 mm, for example. The sheet is slotted in sections and stretched so that several parallel strips 12 are formed from solid sheet metal be, by the intermediate strips 14 of expanded metal with each other are connected. The direction of stretch of the expanded metal is perpendicular to Direction of the strips 12, 14.

In the example shown, the strips 12, 14 have approximately the same width. The Width ratio can be varied depending on the stability requirements. Preferably However, the expanded metal strips should each have a width of at least have three or four stitches.

Figure 2 shows a formwork element in the form of a quiver 16, the walls 18 made in one piece from a wall panel 10 of the type shown in FIG are. For this purpose, the wall panel 10 is first in the direction of the stripes 12, 14 profiled, as shown for example in Figure 3 or 4. The Solid sheet then forms two sets alternately and approximately strips 12, 12 'which lie in two offset planes and which form the combs and valleys of the profile form, while the strips 14 of expanded metal in the essentially form the profile flanks. The wall panel thus profiled is then bent at four bending lines 20 running perpendicular to the running direction of the profile, and the free ends are welded together so that one receives the quiver shown in Figure 2, which has the shape of a square or rectangular column.

The strips 12, which are further out with respect to the quiver, are gently rounded when bending at the bending lines 20. Through these curves the stability of the quiver against the external pressure of the concrete increased considerably. The strips 12 lying further inside become on the other hand, it is subjected to pressure at the bending zones and is put under Formation of relatively sharp bends 22 to the outside. The strips 12 'lie thus in the surface of the walls 18 with respect to the strips 12 inwards back, but are slightly curved outwards towards the bending lines 20, so that the kinks 22 substantially with the rounded areas the strip 12 are flush. This way, essentially straight continuous bending lines formed, which is a relatively slight deformation allow the material. The different deformations of the Strips 12 and 12 'are relative in the area of the bending lines easily stretchable and compressible expanded metal 14 balanced.

The profile of the wall panel 10 or the walls 18 of the quiver 16 can be varied Way can be varied. While in the example shown in Figure 3 the strips 12, 12 'are flat, it can be useful for reasons of stability be to easily profile these full metal strips. Figure 4 shows as an example a slightly rounded profile of the strips 12, 12 '. You can choose these strips also have a triangular or trapezoidal profile, so that they are also parts of the mainly formed by the expanded metal Form profile flanks.

Basically, it is also possible to reverse the profile so that the stripes 14 made of expanded metal forming the ridges and valleys, while the profile flanks be formed by solid sheet.

In the case of a quiver, the profile shown in FIG. 5 can also be used for the walls 18 be used. Here the strips are 14 parts of a continuous Expanded metal plate, onto which individual strips 12, 12 'made of solid sheet metal are welded are. The strips 12, 12 'can be profiled or non-profiled. In the example shown, they are alternately on opposite sides of the Expanded metal panel attached. However, you can also on the same side of the Expanded metal plate can be arranged. In the manufacture are preferred the strips of full metal are first laid flat on the flat expanded metal panel welded, and then the expanded metal and the solid sheet is profiled in one operation. The profile can then look similar Way as the profiles of Figures 3 and 4 bent to the quiver 16 become.

Because in this embodiment on the outside facing the concrete of the quiver a larger surface is formed by the expanded metal (If the solid sheet strips are arranged on the inside, even the entire one Surface), an even better interlocking with the concrete can be achieved.

Because of the great flexibility at the bending lines 20, it is also possible to press the quiver 16 into a diamond shape during transport, as shown in Figure 6. This allows the transport volume and significantly reduce transportation costs. The quiver can be used on site again easily deformed into the ready-to-use state according to FIG. 2 become.

There is also the possibility of a bottom, not shown, in the quiver 16 insert, likewise from a blackboard with a profile of the figures 3 to 5 shown type can be provided. The floor can face two Intervene in the profile of the walls 18 or on bend inwards bent at the lower ends of the walls 18. Due to the breakthroughs formed by the expanded metal Soil desirably permeable to water.

Claims (2)

1. A formwork element in the form of a sleeve (16) the walls (18) of which are made from perforated metal and have a peripheral profiling, characterized in that the walls have several peripheral strips (12, 12') in solid sheet, which are arranged parallel to each other at a distance and are connected with each other by strips (14) of expanded metal, and which form the peaks and troughs of the peripheral profile.
2. The formwork element of claim 1, characterized in that the walls (18) of the sleeve are formed in one piece, whereby bend lines (20) are formed, and in that the outer strips (12) of solid sheet are gently rounded at the bend lines (20) whilst the inner strips (12') of solid sheet are slightly flared outwards towards the bend lines (20) and form a sharp kink which is approximately flush with the gently rounded strips (12) so that the sleeve can be folded together at two diagonally opposite bend lines (20) in the shape of a diamond.

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