EP3825485B1 - Formwork element and formwork system - Google Patents

Description

Technical area

The present invention relates to a formwork element and a formwork system for concrete construction.

State of the art

Concrete structures such as floor/ceiling slabs are often concreted in several sections. Reasons for this include, for example, mixing new concrete or a work break between pouring the individual sections. This creates construction joints that must be sealed against moisture. The shuttering elements used for this are usually made of steel and have larger dimensions, which leads to a high weight and corresponding difficulties when used on the construction site.

From the EP 0 513 740 B1 is a permanent formwork consisting of formwork parts, which are constructed from interconnected transverse and longitudinal bars and a metal panel in between, and a flat water barrier made of sheet metal material that is firmly connected to the formwork parts.

From the DE 20 2008 003 246 U1 A lost formwork is known in which two formwork parts are firmly connected to one another with the aid of a connecting device, leaving a gap. The gap between the two formwork parts is intended to accommodate a flat water barrier.

The DE 20 2009 005 173 U1 also describes a permanent formwork for concrete construction with two formwork parts and a sheet material strip designed as a flat water barrier. The two formwork parts are aligned with one another in a plane, with the sheet material strip being arranged between the two formwork parts and perpendicular to the plane of the formwork parts. The strip of sheet material protrudes beyond the level of the formwork parts on both sides. The sheet material strip has fastening elements on its two surfaces for fastening the formwork parts, the formwork parts being non-positively clamped in the fastening elements to the sheet material strip.

From the DE 10 2007 051 490 A1 a formwork system for producing a plate-shaped concrete structural part with a construction joint in in-situ concrete construction is known. A formwork element used as part of such a formwork system consists of a strip-shaped, water-impermeable sealing element and plate elements arranged in receiving elements on opposite surfaces of the sealing element. The plate elements define the joint plane, while the sealing element runs transversely to the joint plane. Such a formwork element can be used according to EN 10 2007 051 490 A1 Can be used together with a wall connection element for construction joint connections at the transition from floor panels to wall panels. For this purpose, the wall connection element has a strip-shaped support angled at 90°, the first leg of which forms a vertically arranged water barrier and the second leg of which forms a horizontally arranged water barrier.

Often the floor/ceiling slabs to be concrete do not extend over their entire extent in one plane, but instead jump in a vertical direction. In these cases, the floor/ceiling plate has two flat sections, which generally run parallel to one another, but are arranged offset from one another in the vertical direction. The formwork of the area in which the height offset of the floor/ceiling slab takes place and the sealing of this area against water is currently carried out with a lot of work using formwork parts that were improvised and fastened to one another at the construction site.

There is therefore a need for a formwork system through which vertically projecting floor/ceiling panels can be easily boarded in the area of the projecting and equipped with a seal against water.

Presentation of the invention

The invention, as characterized in the claims, is based on the object of providing a formwork system through which vertically projecting floor/ceiling panels can be boarded in a simple manner in the area of the projection and equipped with a seal against water.

This object is achieved according to the invention by the formwork element according to claim 1 and the formwork system according to claim 12. Further advantageous details, aspects and refinements of the present invention emerge from the dependent claims, the description, the examples and the drawings.

The formwork element according to the invention for concrete construction comprises a lower formwork part, an upper formwork part, a slotted formwork part, a horizontal sheet metal strip designed as a flat water barrier and a vertical sheet material strip designed as a flat water barrier. The lower formwork part, the upper formwork part and the slotted formwork part are arranged in a common plane, with the horizontal strip of sheet material being arranged between the formwork parts in such a way that it is aligned essentially perpendicular to the plane of the formwork parts and thereby forms a first surface of the horizontal strip of sheet material upper formwork part and the slotted formwork part and a second surface of the horizontal sheet metal strip faces the lower formwork part and the horizontal sheet material strip protrudes on both sides beyond the plane of the formwork parts.

The upper formwork part and the slotted formwork part are fixedly connected to the first surface of the horizontal sheet material strip and the lower formwork part is fixedly connected to the second surface of the horizontal sheet material strip. The vertical sheet material strip is arranged between the upper formwork part and the slotted formwork part in such a way that it is aligned essentially perpendicular to the plane of the formwork parts and a first surface of the vertical sheet material strip faces the upper formwork part and a second surface of the vertical sheet metal strip faces the slotted formwork part is facing and the vertical strip of sheet material protrudes on both sides beyond the plane of the formwork parts. The upper formwork part is firmly connected to the first surface of the vertical sheet metal strip and the slotted formwork part is firmly connected to the second surface of the vertical sheet material strip in the vertical direction via a portion of its extent extending from the first surface of the horizontal sheet material strip, the horizontal Sheet material strips and the vertical sheet material strips are arranged perpendicular to one another and are firmly connected to one another.

A slot-like recess is provided between the second surface of the vertical sheet material strip and the slotted formwork part, the slot-like recess extending from the edge of the slotted formwork part facing away from the first surface of the horizontal sheet metal strip over at least 3% of the vertical extent of the slotted formwork part.

The particular advantages of the formwork element according to the invention for concrete construction come into play when two of these formwork elements are combined in a formwork system for concrete construction. Such a formwork system for concrete construction comprises at least a first formwork element according to the present invention and at least a second formwork element according to the present invention, wherein the first formwork element and the second formwork element are arranged relative to one another in such a way that the vertical sheet material strip of the first formwork element fits into the slot-like recess of the second formwork element engages and the vertical sheet metal strip of the second formwork element engages in the slot-like recess of the first formwork element. In this arrangement, the second surface of the vertical sheet metal strip of the first formwork element is then in contact with the second surface of the vertical sheet metal strip of the second formwork element.

Such a formwork system made up of two formwork elements according to the invention creates the possibility of boarding a vertically projecting floor/ceiling slab in the area of the projection in a very simple manner to be equipped with a seal against water. The formwork is carried out using two prefabricated standard elements delivered to the construction site, which only have to be inserted into one another in the manner described in order to create a formwork that forms a vertically projecting floor/ceiling slab and equips it with a water barrier.

By varying the dimensions of the vertical sheet material strips and the various formwork parts, the formwork system can be adapted to every conceivable installation situation. Both the horizontal extent of the floor/ceiling plate and the height of the vertical offset can be easily reproduced. The prefabricated formwork elements simply need to be manufactured according to the known dimensions of the floor/ceiling slab.

It is known to those skilled in the art that the formwork parts of a formwork element arranged on the two sides of a water barrier are usually arranged in a common plane. An offset of the formwork parts arranged on different sides, for example of a joint plate, relative to one another does not bring any technical advantages, but the water barrier would have to be dimensioned correspondingly wider so that it protrudes beyond the formwork parts on both sides by the required amount. If, within the scope of this text, it is pointed out in the general description and in the exemplary embodiments that the lower formwork part, the upper formwork part and the slotted formwork part are arranged in a common plane, this is due to the technical requirements mentioned. An insignificant offset of the formwork parts of a formwork element relative to one another is of course covered by the present invention.

The height T of the slotted formwork part can vary over a wide range. Starting from an extension of a few 10 cm for concreting smaller steps up to an extension of 3 m or 5 m for concreting entire building levels. The slot-like recess, which, as explained in more detail below, defines the overlapping area of two sheet metal strips designed as a water barrier, should extend in the vertical direction over at least 100 mm. In the case of formwork parts with a height T of several meters, it is therefore completely sufficient if the slot-like recess, as defined according to the invention, extends over at least 3% of the vertical extent of the slotted formwork part.

The formwork parts are preferably welded to the sheet metal strips. Since the formwork elements and the formwork system formed from these formwork elements must have sufficient stability in order to be able to be installed on the construction site without any problems and in order to be able to withstand the concrete pressure after the in-situ concrete has been poured into the formwork, formwork parts and strips of sheet material must be firmly and permanently connected to one another. Welding the individual parts is particularly suitable for ensuring a stable connection.

It is particularly useful if the formwork parts comprise a grid mat comprising transverse and longitudinal bars and a perforated metal sheet welded between the transverse and longitudinal bars of the grid mat. The perforated metal sheet is particularly preferably an expanded metal sheet or a perforated sheet metal.

The cross bars of the metal grid are preferably welded to the longitudinal bars of the metal grid at their intersection points. The transverse and longitudinal bars of the metal grid are also welded to the perforated metal sheet. The openings are advantageously chosen to be large enough, on the one hand, to ensure that the concrete slurry passing through ensures a durable and stable connection of the concrete of the two adjacent concreting sections, but on the other hand not so large that the concrete of the first concreting section can flow through the openings.

Depending on the type of use of the formwork elements, the thickness of the transverse and longitudinal bars of the metal grid and the distance between the transverse and longitudinal bars can be optimized. The higher the expected concrete pressure on the formwork element, the thicker the individual bars must be dimensioned or the smaller the distance between them and the transverse and longitudinal bars of the metal grid must be used.

According to a particularly preferred embodiment of the present invention, at least one strip of sheet metal material is provided with a sealing coating at least partially, preferably over the entire surface, on its first and/or second surface. The at least partial, preferably full-surface coating provides a particularly good seal against water. Another advantage is particularly associated with the coating of the vertical strips of sheet metal material. As already described, a formwork system according to the present invention has at least a first and at least a second of the formwork elements described above. The first formwork element and the second formwork element are arranged relative to one another in such a way that the vertical sheet metal strip of the first formwork element engages in the slot-like recess of the second formwork element and the vertical sheet metal strip of the second formwork element engages in the slot-like recess of the first formwork element. The second surface is then in this arrangement of the vertical sheet material strip of the first formwork element comes into contact with the second surface of the vertical sheet metal strip of the second formwork element. If the two vertical sheet metal strips are at least partially, preferably over the entire surface, equipped with a sealing coating which always has a certain stickiness, the two vertical sheet material strips are firmly connected to one another after their surfaces have been brought into contact, namely firmly glued to one another. This gives the entire formwork system additional stability during construction. In addition, the formwork system has additional protection against surrounding water when vertical sheet material strips are glued together.

The sealing coating can in principle be applied to the sheet metal strip in any manner known to those skilled in the art. Preferably, the sealing coating has an adhesive layer for attachment to the sheet metal strip. Before application to the strip of sheet material, the adhesive layer of the coating is usually covered with a strip of paper. For attachment, the paper strip can then simply be removed from the coating and the adhesive layer can be pressed onto the sheet material strip. A durable connection is easily created between the coating and the sheet metal strip.

The coatings described in more detail below are generally materials that can be melted at higher temperatures without decomposition. Spraying the liquid coating material onto the sheet material strip can therefore be used as a further preferred way of applying the coating to the sheet metal strip. The coating material is sprayed onto the sheet metal strip using a spray nozzle, where it cools and produces a solid sealing coating.

Regardless of how the coating is applied to the strip of sheet metal material, the coating is provided with a protective coating until it is used as part of a water barrier. The materials used as a sealing coating always give the coating a sticky surface that bonds well to the poured concrete in a known manner. To protect these sticky surfaces, a layer of paper or plastic film is typically used, which is then peeled away from the coating before the concrete is poured.

As usual and known to those skilled in the art, when the formwork elements according to the invention and the formwork system according to the invention are used in water-exposed concrete parts, the sealing coating ensures that the joint is sealed against water. It is particularly advantageous if the surfaces of the coatings blend well with the Connect concrete on both sides of the joint. According to a particularly preferred embodiment of the present invention, the coating therefore has a sticky surface that permanently bonds to the adjacent concrete. If the expected shrinkage of the concrete occurs during hardening, the sealing coating on both sides of the formwork is pulled along by the concrete, increasing the thickness of the coating. In this way, the sealing coating ensures that the joint is securely sealed against water.

In principle, any type of coating that has the properties mentioned can be used as a sealing coating in the context of the present invention. Coatings that essentially consist of butyl rubber, bentonite, bitumen rubber, a hot-melt adhesive or a swellable plastic are particularly suitable. “Swellable plastic” refers to all common thermoplastic elastomers containing a swellable material. Swellable plastics can be purchased on the market in film form or in the form of tapes.

Butyl rubber is polyisobutylene that is modified with resins and fillers (e.g. calcium carbonate). Bitumen rubber is a petroleum-derived product whose exact composition varies. Bentonite is a swellable mixture of various clay minerals. The main component is montmorillonite (60 - 80%), accompanying minerals are quartz, mica, feldspar, pyrite and calcite.

The thickness of the coating is chosen so that, on the one hand, the coating remains attached to the hardening concrete even when the concrete shrinks, but on the other hand, no unnecessary coating material is applied to the lost formwork. The sealing coating preferably has a thickness between 0.1 mm and 5 mm, particularly preferably between 0.15 mm and 3 mm, in particular a thickness between 0.2 mm and 2 mm and particularly preferably a thickness between 0.5 mm and 1. 5 mm up. A thickness of the sealing coating of around 1 mm proves to be particularly advantageous.

The coating materials mentioned in the coating thicknesses mentioned can increase their volume by at least 50% and up to 100% under tensile load. This ensures good sealing of the joint even in the event of significant concrete shrinkage.

According to a preferred embodiment of the present invention, the slot-like recess extends from the first surface of the horizontal Sheet material strip facing away from the edge of the slotted formwork part over at least 10% of the vertical extent of the slotted formwork part, particularly preferably over at least 25%, particularly preferably over at least 50%, very particularly preferably over at least 70% and in particular over at least 90% of the vertical extent of the slotted formwork part .

Particularly preferably, the slot-like recess extends, starting from the edge of the slotted formwork part facing away from the first surface of the horizontal sheet metal strip, over a maximum of 95% of the vertical extent of the slotted formwork part, particularly preferably over a maximum of 80%, particularly preferably over a maximum of 50%, very particularly preferably over maximum 30% of the vertical extent of the slotted formwork part.

It should be explicitly mentioned that the present invention also includes all sensible combinations of the mentioned minimum and maximum values of the extent of the slot-like recess. Particularly preferably, the slot-like recess extends, starting from the edge of the slotted formwork part facing away from the first surface of the horizontal sheet metal strip, for example over at least 10% and over a maximum of 95% of the vertical extent of the slotted formwork part or over at least 25% and a maximum of 80% of the vertical Expansion of the slotted formwork part or over at least 70% and a maximum of 95% of the vertical extent of the slotted formwork part. As I said, all combinations of the mentioned minimum and maximum values of the extent of the slot-like recess that make sense to the person skilled in the art are covered by the present invention.

By dimensioning the slot-like recess, it must be ensured, on the one hand, that the vertical sheet material strip of the first formwork element can engage sufficiently far into the slot-like recess of the second formwork element and that the vertical sheet metal strip of the second formwork element can engage sufficiently far into the slot-like recess of the first formwork element. A sufficient overlap of the two vertical strips of sheet metal material ensured in this way is necessary in order to ensure a secure seal of the vertical section of the floor/ceiling plate in the area of its offset. On the other hand, the slot-like recess should not extend completely to the horizontal strip of sheet metal material, since attachment of the vertical strip of sheet material to the slotted formwork part would then not be possible. However, particularly with regard to the stability of the entire formwork part, it has proven to be advantageous if this fastening area of the vertical sheet metal strip and the slotted formwork part extends as far as possible.

The dimensioning of the slot-like recess therefore represents a compromise between the stability of the formwork element and the quality of the seal against pressing water.

Preferably, a slot-like recess is provided between the first surface of the horizontal strip of sheet metal material and the slotted formwork part, the slot-like recess extending from the edge of the slotted formwork part facing away from the second surface of the vertical strip of sheet metal material over a maximum of 50% of the horizontal extent of the slotted formwork part. Through such a slot-like recess, further standardized formwork elements can be connected in a particularly simple and advantageous manner, as a result of which the formwork of the base/cover plate can be continued uninterruptedly and continuously over its entire extent.

Also preferably, a slot-like recess is provided between the first surface of the horizontal sheet metal strip and the upper formwork part, the slot-like recess extending from the edge of the upper formwork part facing away from the first surface of the vertical sheet material strip over a maximum of 50% of the horizontal extent of the upper formwork part. This embodiment ensures the continuation of the formwork of the base/cover plate as already described above, also in a second direction, depending on the specific installation situation.

It is obvious to the person skilled in the art that the two embodiments mentioned with a slot-like recess extending from an edge of the upper formwork part facing away from a surface of the vertical sheet material strip enable a connection of standardized formwork elements both for the shuttering of the formwork in the vertical direction relative to the offset at a lower level located section of the floor/ceiling slab as well as for the formwork of the section of the floor/ceiling slab located at a higher level in the vertical direction relative to the offset. The part of the floor/ceiling slab to be shuttered is determined solely by whether the respective formwork element is used as the first or second formwork element of a formwork system according to the invention.

According to a preferred embodiment, the formwork system for concrete construction according to the present invention not only has at least a first formwork element according to the present invention and at least one second formwork element formwork element according to the present invention, but at least one connecting formwork element is additionally provided, wherein the connection formwork element is a lower Connection formwork part, an upper connection formwork part and a horizontal one designed as a flat water barrier Has strips of sheet metal material. The lower connection formwork part and the upper connection formwork part are arranged in a common plane, with the horizontal sheet material strip being arranged between the connection formwork parts in such a way that it is aligned essentially perpendicular to the plane of the connection formwork parts and a first surface of the horizontal sheet metal material strip faces the upper connection formwork part and a second surface of the horizontal sheet material strip faces the lower connection formwork part and the horizontal sheet material strip protrudes on both sides beyond the plane of the connection formwork parts. The upper connection formwork part is firmly connected to the first surface of the horizontal sheet metal strip and the lower connection formwork part is firmly connected to the second surface of the horizontal sheet material strip.

At least one slot-like recess is provided between the first surface of the horizontal sheet metal material strip and the upper connection formwork part, the slot-like recess extending from a vertically oriented edge of the upper connection formwork part over a maximum of 10% of the horizontal extent of the upper connection formwork part. The at least one first formwork element has a slot-like recess between the first surface of the horizontal sheet metal strip and the slotted formwork part or the upper formwork part, the slot-like recess extending from the edge of the slotted formwork part or the upper formwork part facing away from a surface of the vertical sheet material strip over a maximum 50% of the horizontal extent of the slotted formwork part of the upper formwork part extends. The first formwork element and the connection formwork element are arranged relative to one another in such a way that the horizontal sheet metal strip of the first formwork element engages in the slot-like recess of the connection formwork element and the horizontal sheet metal strip of the connection formwork element engages in the slot-like recess of the first formwork element, with a surface of the horizontal sheet metal strip of the first formwork element is in contact with a surface of the horizontal sheet metal strip of the second formwork element.

By using one or more additional connecting formwork elements, the formwork system can be enlarged in a very simple manner by connecting standardized formwork elements both for the formwork of the section of the floor/ceiling slab that is at a lower level in the vertical direction relative to the offset as well as for the formwork of the possible in the vertical direction relative to the offset at a higher level in the section of the floor/ceiling slab.

With regard to the stability of the formwork elements, it is particularly expedient if the individual formwork parts have a transverse or longitudinal bar of the grid mat, which is preferably used as part of the formwork parts, in the area of their boundary edges.

Brief description of the drawings

Fig. 1

eine perspektivische Ansicht eines erfindungsgemäßen Schalungselements;

Fig. 2

eine perspektivische Ansicht eines erfindungsgemäßen Schalungssystems, das sich aus zwei Schalungselementen gemäß Fig. 1 zusammensetzt;

Fig. 3

eine seitliche Ansicht einer weiteren Ausführungsform eines erfindungsgemäßen Schalungselements;

Fig. 4

eine seitliche Ansicht eines Anschlussschalungselements;

Fig. 5

eine seitliche Ansicht der Ausführungsform gemäß Figur 3 und eines Anschlussschalungselements gemäß Figur 4;

Fig. 6

eine seitliche Ansicht einer Kombination von zwei in der Figur 5 dargestellten Schalungssystemen.

The invention will be explained in more detail below using exemplary embodiments in connection with the drawings. However, it is expressly pointed out that the invention should not be limited to the examples given. Show it

Fig. 1

a perspective view of a formwork element according to the invention;

Fig. 2

a perspective view of a formwork system according to the invention, which consists of two formwork elements Fig. 1 composed;

Fig. 3

a side view of a further embodiment of a formwork element according to the invention;

Fig. 4

a side view of a connection formwork element;

Fig. 5

a side view of the embodiment according to Figure 3 and a connection formwork element according to Figure 4 ;

Fig. 6

a side view of a combination of two in the Figure 5 formwork systems shown.

Ways of carrying out the invention

Figure 1 shows a formwork element S for concrete construction comprising a lower formwork part 1, an upper formwork part 2, a slotted formwork part 3, a horizontal sheet metal strip 4 designed as a flat water barrier and a vertical sheet metal strip 5 designed as a flat water barrier.

The formwork parts 1, 2, 3 consist of a grid mat comprising transverse and longitudinal bars and each of an expanded metal sheet welded between the transverse and longitudinal bars of the grid mat.

The lower formwork part 1, the upper formwork part 2 and the slotted formwork part 3 are arranged in a common plane, the horizontal sheet material strip 4 being arranged between the formwork parts 1, 2, 3 in such a way that it is essentially perpendicular to the plane of the formwork parts 1, 2, 3 is aligned and a first surface 4a of the horizontal sheet material strip faces the upper formwork part 2 and the slotted formwork part 3 and a second surface 4b of the horizontal sheet metal strip faces the lower formwork part 1.

The horizontal sheet metal strip 4 projects beyond the level of the formwork parts 1, 2, 3 on both sides. The upper formwork part 2 and the slotted formwork part 3 are welded to the first surface 4a of the horizontal sheet material strip, and the lower formwork part 1 is welded to the second surface 4b of the horizontal sheet material strip.

The vertical sheet metal strip 5 is arranged between the upper formwork part 2 and the slotted formwork part 3 in such a way that it is aligned essentially perpendicular to the plane of the formwork parts 1, 2, 3 and a first surface 5a of the vertical sheet material strip faces the upper formwork part 2 and a second surface 5b of the vertical sheet material strip faces the slotted formwork part 3.

The vertical sheet metal strip 5 projects beyond the plane of the formwork parts 1, 2, 3 on both sides. The upper formwork part 2 is welded to the first surface 5a of the vertical sheet metal strip and the slotted formwork part 3 is connected to the second surface 5b of the vertical via a partial area TV of its extension T in the vertical direction, starting from the first surface 4a of the horizontal sheet material strip 4 Sheet material strip 5 welded. The horizontal sheet metal strip 4 and the vertical sheet metal strip 5 are arranged perpendicular to one another and are firmly welded together.

A slot-like recess 6 is provided between the second surface 5b of the vertical sheet material strip 5 and the slotted formwork part 3, the slot-like recess 6 extending from the edge R of the slotted formwork part 3 facing away from the first surface 4a of the horizontal sheet material strip 4 over around 80% of the vertical extent T of the slotted formwork part 3 extends.

Figure 2 shows a formwork system for concrete construction, which is constructed from two of the formwork elements described above. The formwork system comprises a first formwork element S1 and a second formwork element S2, the first Formwork element S1 and the second formwork element S2 are arranged relative to one another in such a way that the vertical sheet material strip 51 of the first formwork element S1 engages in the slot-like recess S62 of the second formwork element S2 and the vertical sheet material strip 52 of the second formwork element S2 engages in the slot-like recess S61 of the first formwork element S1 . The second surface 51b of the vertical sheet material strip 51 of the first formwork element S1 is in contact with the second surface 52b of the vertical sheet metal strip 52 of the second formwork element S2.

That in the Figure 2 The formwork system shown is constructed from two identical formwork elements as described above. The dimensions of all formwork parts and sheet material strips are the same for both formwork elements S1, S2. The formwork is done using two standard elements delivered to the construction site prefabricated, which are then simply inserted into one another to form a formwork that forms a vertically projecting floor/ceiling slab and equips it with a water barrier. By varying the dimensions of the vertical sheet material strips 51, 52 and the various formwork parts of the two formwork elements S1, S2, the formwork system can be adapted to any conceivable installation situation. Both the horizontal extent of the floor/ceiling plate and the height of the vertical offset can be easily reproduced. The prefabricated formwork elements S1, S2 simply need to be manufactured according to the previously known dimensions of the floor/ceiling slab.

Both the in Figure 1 formwork element shown as well as that in Figure 2 The formwork system shown is fully equipped with a sealing coating (not shown) made of butyl rubber on the surfaces of its sheet metal strips. Since the two vertical sheet metal strips 51, 52 are also provided over the entire surface with a sealing coating which has a certain stickiness, the two vertical sheet metal strips 51, 52 are firmly glued to one another after their surfaces have been brought into contact. This gives the entire formwork system additional stability during construction. In addition, the formwork system has additional protection against surrounding water when vertical sheet metal strips 51, 52 are glued together.

Figure 3 shows a side view of a further embodiment of a formwork element S1A according to the invention. A slot-like recess 61 is provided between the first surface 4a of the horizontal sheet metal strip 4 and the slotted formwork part 3, the slot-like recess 61 extending from that of the second surface 5b of the vertical sheet metal strip 5 edge Rb of the slotted formwork part 3 facing away extends over around 25% of the horizontal extent TG of the slotted formwork part 3.

In addition, a slot-like recess 62 is provided between the first surface 4a of the horizontal sheet metal strip 4 and the upper formwork part 2, the slot-like recess 62 extending from the edge Ra of the upper formwork part 2 facing away from the first surface 5a of the vertical sheet metal strip 5 over approximately 25%. the horizontal extent TO of the upper formwork part 2 extends.

Through the slot-like recesses 61, 62, further standardized formwork elements can be connected in a particularly simple and advantageous manner, whereby the formwork of the base/cover plate can be continued over its entire extent without interruption and continuously in both directions, depending on the specific installation situation.

Such a standardized formwork element, with the help of which the formwork of the base/cover slab can be continued, is in the Figure 4 shown. The connecting formwork element S3 has a lower connecting formwork part S31, an upper connecting formwork part S32 and a horizontal sheet metal strip S34 designed as a flat water barrier.

The connecting formwork parts S31, S32 consist of a grid mat comprising transverse and longitudinal bars and an expanded metal sheet welded between the transverse and longitudinal bars of the grid mat.

The lower connection formwork part S31 and the upper connection formwork part S32 are arranged in a common plane. The horizontal sheet metal strip S34 is arranged between the connecting formwork parts S31, S32 in such a way that it is aligned essentially perpendicular to the plane of the connecting formwork parts S31, S32 and a first surface S34a of the horizontal sheet metal strip faces the upper connecting formwork part S32 and a second surface S34b of the horizontal sheet metal strip faces the lower connecting formwork part S31. The horizontal sheet metal strip S34 protrudes on both sides beyond the level of the connecting formwork parts S31, S32.

The upper connection formwork part S32 is welded to the first surface S34a of the horizontal sheet material strip and the lower connection formwork part S31 is welded to the second surface S34b of the horizontal sheet material strip.

Two slot-like recesses S36, S37 are provided between the first surface S34a of the horizontal sheet metal material strip and the upper connection formwork part S32, the slot-like recess S36 extending from a vertically oriented edge S3R of the upper connection formwork part S32 over around 15% of the horizontal extent S3T of the upper connection formwork part S32 extends, and the slot-like recess S37 extends, starting from a vertically oriented edge S3A of the upper connection formwork part S32, over around 15% of the horizontal extent S3T of the upper connection formwork part S32.

As in Figure 5 can be shown in the Figure 3 formwork element S1A shown and that in Figure 4 shown connection formwork element S3 are moved towards each other in the direction of the two arrows so that the horizontal sheet metal strip 4 of the formwork element S1A engages in the slot-like recess S36 of the connection formwork element S3 and the horizontal sheet metal strip S34 of the connection formwork element S3 engages in the slot-like recess 61 of the formwork element S1A.

As a result, a surface of the horizontal sheet metal strip 4 of the formwork element S1A comes into contact with a surface of the horizontal sheet metal strip S34 of the connecting formwork element S3. Since the sheet material strips are in turn provided with a corresponding coating, the formwork element S1A and the connecting formwork element S3 are firmly glued together. This gives the entire formwork system additional stability. In addition, the formwork system has additional protection against surrounding water when horizontal sheet material strips 4, S34 are glued together.

By using several additional connecting formwork elements S3, the formwork system can be enlarged in a very simple manner by connecting standardized formwork elements both for formwork of the section of the floor/ceiling slab that is at a lower level in the vertical direction relative to the offset as well as for formwork of the possible in the vertical direction relative to the offset of the section of the floor/ceiling slab located at a higher level. As in Figure 6 shown, the formwork system can be continued both at the lower level of the formwork element S1A and at the level of the formwork element S2A, which is higher in the vertical direction relative to the offset, by connecting connecting formwork elements S3 in the horizontal direction.

Reference symbol list

1

lower formwork part

2

upper formwork part

3

slotted formwork part

4

horizontal strip of sheet material

4a, 4b

first and second surfaces of the horizontal sheet metal strip 4

5

vertical strip of sheet material

5a, 5b

first and second surfaces of the vertical sheet metal strip 5

51

vertical strip of sheet material

51b

second surface of the vertical sheet metal strip 51

52

vertical strip of sheet material

52b

second surface of the vertical sheet metal strip 52

6, 61, 62

slot-like recess

S36, S37

slot-like recess

S61, S62

slot-like recess

S, S1A, S2A

formwork element

S1

first formwork element

S2

second formwork element

S3

Connection formwork element

S31

lower connection formwork part

S32

upper connection formwork part

S34

horizontal strip of sheet material

S34a

the first surface of the horizontal sheet material strip S34 facing the upper connecting formwork part

S34b

the second surface of the horizontal sheet material strip S34 facing the lower connecting formwork part

T

Expansion of the slotted formwork part in the vertical direction

TG

horizontal extent of the slotted formwork part

TV

Partial area of the expansion of the slotted formwork part in the vertical direction

TO

horizontal expansion of the upper formwork part

R

the edge of the slotted formwork part facing away from the first surface of the horizontal sheet metal strip

Ra

the edge of the upper formwork part facing away from the first surface of the vertical strip of sheet metal material

S3R, S3A

vertically oriented edge of the upper connecting formwork part

Claims (13)

1. Formwork element (S) for concrete construction, comprising a lower formwork part (1), an upper formwork part (2), a slotted formwork part (3), a horizontal sheet metal material strip (4) designed as a flat water barrier, and a vertical sheet metal material strip (5) designed as a flat water barrier,

   wherein the lower formwork part (1), the upper formwork part (2) and the slotted formwork part (3) are arranged in a common plane,

   wherein the horizontal sheet metal material strip (4) is arranged between the formwork parts (1, 2, 3) in such a way as to be aligned essentially perpendicular to the plane of the formwork parts (1, 2, 3), wherein a first surface (4a) of the horizontal sheet metal material strip faces the upper formwork part (2) and the slotted formwork part (3), and a second surface (4b) of the horizontal sheet metal material strip faces the lower formwork part (1), and the horizontal sheet metal material strip (4) protrudes over the plane of the formwork parts (1, 2, 3) on both sides,

   wherein the upper formwork part (2) and the slotted formwork part (3) are firmly connected with the first surface (4a) of the horizontal sheet metal material strip, and the lower formwork part (1) is firmly connected with the second surface (4b) of the horizontal sheet metal material strip,

   wherein the vertical sheet metal material strip (5) is arranged between the upper formwork part (2) and the slotted framework part (3) in such a way as to be essentially perpendicularly aligned to the plane of the formwork parts (1, 2, 3), wherein a first surface (5a) of the vertical sheet metal material strip faces the upper formwork part (2) and a second surface (5b) of the vertical sheet metal material strip faces the slotted formwork part (3), and the vertical sheet metal material strip (5) protrudes over the plane of the formwork parts (1, 2, 3) on both sides,

   wherein the upper formwork part (2) is firmly connected with the first surface (5a) of the vertical sheet metal material strip, and the slotted formwork part (3) is rigidly connected with the second surface (5b) of the vertical sheet metal material strip (5) by way of a partial area (TV) of its expansion (T) that extends in a vertical direction proceeding from the first surface (4a) of the horizontal sheet metal material strip (4),

   wherein the horizontal sheet metal material strip (4) and the vertical sheet metal material strip (5) are arranged perpendicular to each other, and are firmly connected with each other,

   wherein a slot-like recess (6) is provided between the second surface (5b) of the vertical sheet metal material strip (5) and the slotted formwork part (3), wherein the slot-like recess (6) proceeds from the edge (R) of the slotted formwork part (3) facing away from the first surface (4a) of the horizontal sheet material strip (4) to extend over at least 3% of the vertical expansion (T) of the slotted formwork part (3).
2. Formwork element (S) according to claim 1, characterized in that the formwork parts (1, 2, 3) are welded to the sheet metal material strips (4, 5).
3. Formwork element (S) according to one of claims 1 and 2, characterized in that the formwork parts (1, 2, 3) each comprise a respective grid mat having transverse and longitudinal bars and a respective openwork metal sheet welded between the transverse and longitudinal bars of the grid mat.
4. Formwork element (S) according to claim 3, characterized in that the openwork metal sheet is an expanded metal or a perforated sheet.
5. Formwork element (S) according to one of claims 1 to 4, characterized in that the first and/or second surface of at least one sheet metal material strip (4, 5) is provided at least partially, preferably completely, with a sealing coating.
6. Formwork element (S) according to one of claims 1 to 5, characterized in that the sealing coating comprises an adhesive layer to be fastened to the sheet metal material strip (4, 5).
7. Formwork element (S) according to one of claims 1 to 6, characterized in that the sealing coating consists of butyl-rubber, bentonite, bitumen-rubber, a hot-melt adhesive, or a mixture of these materials.
8. Formwork element (S) according to one of claims 1 to 7, characterized in that the sealing coating comprises a thickness of between 0.1 mm and 5 mm, preferably a thickness of between 0.15 mm and 3 mm, especially preferably a thickness of between 0.2 mm and 2 mm, particularly preferably a thickness of between 0.5 mm and 1.5 mm, and very especially preferably a thickness of roughly 1 mm.
9. Formwork element (S) according to one of claims 1 to 8, characterized in that the slot-like recess (6) proceeds from the edge (R) of the slotted formwork part (3) facing away from the first surface (4a) of the horizontal sheet metal material strip (4) to extend over at least 10% of the vertical expansion (T) of the slotted formwork part (3), preferably over at least 25%, especially preferably over at least 50%.
10. Formwork element (S1A) according to one of claims 1 to 9, characterized in that a slot-like recess (61) is provided between the first surface (4a) of the horizontal sheet metal material strip (4) and the slotted formwork part (3), wherein the slot-like recess (61) proceeds from the edge (Rb) of the slotted formwork part (3) facing away from the second surface (5b) of the vertical sheet metal material strip (5) to extend over at most 50% of the horizontal expansion (TG) of the slotted formwork part (3).
11. Formwork element (S1A) according to one of claims 1 to 10, characterized in that a slot-like recess (62) is provided between the first surface (4a) of the horizontal sheet metal material strip (4) and the upper formwork part (2), wherein the slot-like recess (62) proceeds from the edge (Ra) of the upper formwork part (2) facing away from the first surface (5a) of the vertical sheet metal material strip (5) to extend over at most 50% of the horizontal expansion (TO) of the upper formwork part (2).
12. Formwork system for concrete construction comprising at least a first formwork element (S1) according to one of claims 1 to 11 and at least a second formwork element (S2) according to one of claims 1 to 11,
    characterized in that

    the first formwork element (S1) and the second formwork element (S2) are arranged relative to each other in such a way that the vertical sheet metal material strip (51) of the first formwork element (S1) engages into the slot-like recess (62) of the second formwork element (S2), and the vertical sheet metal material strip (52) of the second formwork element (S2) engages into the slot-like recess (61) of the first formwork element (S1),

    wherein the second surface (51b) of the vertical sheet metal material strip (51) of the first formwork element (S1) is in contact with the second surface (52B) of the vertical sheet metal material strip (52) of the second formwork element (S2).
13. Formwork system according to claim 12, characterized in that at least one connecting formwork element (S3) is provided, wherein the connecting formwork element (S3) comprises a lower connecting formwork part (S31), an upper connecting formwork part (S32), and a horizontal sheet metal material strip (S34) designed as a flat water barrier,

    wherein the lower connecting formwork part (S31) and the upper connecting formwork part (S32) are arranged in a common plane,

    wherein the horizontal sheet metal material strip (S34) is arranged between the connecting formwork parts (S31, S32) in such a way that it is essentially perpendicularly aligned to the plane of the connecting formwork parts (S31, S32), wherein a first surface (S34a) of the horizontal sheet metal material strip faces the upper connecting formwork part (S32) and a second surface (S34b) of the horizontal sheet metal material strip faces the lower connecting formwork part (S31), and the horizontal sheet metal material strip (S34) protrudes over the plane of the connecting formwork parts (S31, S32) on both sides,

    wherein the upper connecting formwork part (S32) is firmly connected with the first surface (S34a) of the horizontal sheet metal material strip, and the lower connecting formwork part (S31) is firmly connected with the second surface (S34b) of the horizontal sheet metal material strip,

    wherein at least one slot-like recess (S36) is provided between the first surface (S34a) of the horizontal sheet metal material strip and the upper connecting formwork part (S32), wherein the slot-like recess (S36) proceeds from a vertically oriented edge (S3R) of the upper connecting formwork part (S32) to extend over at most 10% of the horizontal expansion (S3T) of the upper connecting formwork part (S32),

    wherein the at least one first formwork element (S1A) comprises a slot-like recess (61, 62) between the first surface (4a) of the horizontal sheet metal material strip (4) and the slotted formwork part (3) or the upper formwork part (2), wherein the slot-like recess (61, 62) proceeds from the edge (Ra, Rb) of the slotted formwork part (3) or the upper formwork part (2) facing away from a surface (5a, 5b) of the vertical sheet metal material strip (5) to extend over at most 50% of the horizontal expansion (TG, TO) of the slotted formwork part (3) or the upper formwork part (2),

    wherein the first formwork element (S1A) and the connecting formwork element (S3) are arranged relative to each other in such a way that the horizontal sheet metal material strip (4) of the first formwork element (S1A) engages into the slot-like recess (S36) of the connecting formwork element (S3), and the horizontal sheet metal material strip (S34) of the connecting formwork element (S3) engages into the slot-like recess (61) of the first formwork element (S1A),

    wherein a surface of the horizontal sheet metal material strip (4) of the first formwork element (S1A) is in contact with a surface of the horizontal sheet metal material strip (S34) of the connecting formwork element (S3).

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