WO2016174595A1 - Formwork panel or accessories for a formwork or formwork panel - Google Patents

Abstract

Formwork panel or accessory for a formwork or formwork panel, wherein a formwork panel comprises lateral faces and crosscut sides and wherein an accessory for a formwork or formwork panel mainly consists of a straight slat- shaped element with lateral faces that are wider than the side edges, which is provided with one or several deformable strips (9), wherein the intermediate distance (D) between the outermost edges of the strips (9) is larger than or equal to 75% of the width (B) of the formwork panel and wherein the height (H) of one or several of said deformable strips (9) is smaller than one third of that intermediate distance (D).

Description

Formwork panel or accessory for a formwork or formwork panel .

The present invention concerns a formwork panel or an accessory for a formwork or formwork panel.

A formwork is a temporarily provided mold or counter mold into which concrete is poured.

The mold is intended to keep the concrete and any reinforcement in place during the pouring and curing. Such a mold may consist of various materials such as wood, plastic or steel.

When the concrete has cured, the formwork is usually removed and, in the case of a modular formwork, re-used in a subsequent application. A formwork is usually built by carpenters and the reinforcement is provided by reinforcing steel braiders.

It is also possible that the formwork is not removed after use. This is called lost formwork. A modular formwork is a formwork built of separate formwork elements: formwork panels which are mutually positioned by means of tie rods, which are aligned by means of props and which are coupled to one another by means of formwork locks and clamps. Each formwork panel is usually made up of a framework, i.e. vertical and horizontal supports onto which a form plate made of wood, plastic or metal has been provided.

The frameworks of a modular formwork may consist of metal such as for example steel or aluminum, wood or plastic.

On the frameworks is mounted a plate. The quality of this plate determines the final result. The smoother the plate, the smoother the concrete wall. For this plate is traditionally used wood, metal or plastic. Wooden form plates have a relatively short life, metal plates are sturdy but heavy and subject to corrosion, and plastic plates can be used and handled for a very long time thanks to a reasonable weight, but just as the metal plates they are expensive. Modular formwork offers great time savings during the construction process and virtually unlimited use.

Before the introduction of the modular formwork, a formwork was built entirely customized and consisted of wooden support beams and a form plate.

A problem arising with formworks in general and with modular formworks in particular is the poor connection of the formwork panels to the base.

That poor connection is the cause of serious problems. One the one hand, a poor connection of a formwork panel to the base may result in loss of cement which may flow away with water along the openings. It is clear that all this results in an inferior concrete composition, particularly at the bottom of the shuttered wall portion.

This not only has aesthetic drawbacks, but it may also give rise to constructional problems, such as for example an imperfect water sealing with all its consequences.

If the openings merely result in bulging concrete parts at the bottom of the wall, which become only visible after the removal of the formwork panels, they may have to be removed, which is incredibly labor-intensive and may possibly damage the wall.

On the other hand, a bad connection of a formwork panel to the base may result in for example mud or other unwanted substances seeping into the space inside the formwork.

Indeed, when a formwork is prepared whereas the concrete is only poured at a later stage, it is clear that for example in case of heavy rain, sand may be carried into the space where concrete is to be poured at a later stage, with all the entailing negative consequences.

In order to avoid the above, the openings are often sealed with the aid of polyurethane foam. It is clear that the uncontrolled expansion on the invisible side may take undesired volumes with possibly even more serious consequences .

Formworks are known in which deformable elements, for example in the shape of a rubber or the like, are used to obtain a seal between a substrate and the formwork, for example from documents CN103938859, DE19745748A, GB2387616A, CN201395939Y, WO0208535A2. However, these known solutions are either all impractical in practice or have significant disadvantages.

A major disadvantage is for example that the formwork is not stably supported by the deformable elements.

Yet another disadvantage of these known solutions is that, during their application, the formwork is deformed as well and/or the deformable elements will deform in such a way that, after the concrete has cured, there is not obtained any flat finished concrete surface in the vicinity of the substrate on which the formwork was applied.

Yet another disadvantage of these known solutions consists in that the deformable elements can only be applied on a very flat and completely leveled base.

The present invention aims to remedy the above-mentioned disadvantages of the known formworks and possibly other disadvantages as well.

To this end, the invention concerns a formwork panel, wherein such a formwork panel comprises lateral faces and crosscut sides, wherein at least one of the crosscut sides is provided with one or several deformable strips, wherein the intermediate distance between the outermost edges of one or several of said deformable strips is larger than or equal to 75% of the width of the crosscut side of the formwork panel and wherein the height of one or several of said deformable strips is smaller than one third of said intermediate distance.

The formwork panel may be provided with at least one groove on at least one of its crosscut sides in which is provided or may be provided at least one deformable strip.

A formwork panel usually comprises a framework provided with a form plate on one side. The thickness of the formwork panel is in other words determined by the thickness of the framework and by the thickness of the form plate.

The outward facing walls of the outermost vertical and horizontal supports of the framework usually also form the crosscut sides of the formwork panel.

These supports may be plastic or metal profiles or for example also massive wooden beams.

The grooves may be provided in a variety of ways.

According to one of the preferred embodiments, the grooves are chambers provided in profiles, for example extruded aluminum profiles or profiles made of PVC or another material . The present invention also concerns an accessory for a formwork or formwork panel, wherein such an accessory for a formwork or formwork panel substantially consists of a straight slat-shaped element with lateral faces that are wider than the side edges, wherein at least one of the wider lateral faces is provided with one or several deformable strips, wherein the intermediate distance between the outermost edges of said one or several deformable strips is larger than or equal to 75% of the width B of the wider lateral face concerned of the straight slat-shaped element, and wherein the height H of one or several of said deformable strips is smaller than one third of said intermediate distance. Such an accessory for a formwork or formwork panel may be provided with at least one groove on one of its side walls, in which at least one deformable strip is provided or can be provided. A major advantage of the invention consists in that cement or concrete is prevented from flowing out of the inner space of the formwork and also that sand or any other polluting or unwanted substances are prevented from flowing in the inner space.

The advantage of the accessory for a formwork or formwork panel according to the invention with respect to the formwork panel according to the invention consists in that said technical effects may be obtained with existing formwork panels. A major advantage of a formwork panel and an accessory according to the invention consists in that, during use, a good, stable support is obtained underneath the formwork with the aid of one or several of said deformable strips.

On the one hand, this is due to the fact that one or several of said deformable strips offer support to the formwork panel over an intermediate distance which practically corresponds to the entire width or even to the entire width of the formwork panel concerned.

On the other hand, the height of one or several of said deformable strips is sufficiently low to prevent any annoying bulging thereof.

Thus, lopsided embodiments of concrete surfaces are avoided as well as any concrete mortar leaking along the deformable strips. In a preferred embodiment of a formwork panel or of an accessory for a formwork or formwork panel according to the invention, said one or several deformable strips is or are such that when using the formwork panel or the accessory in a formwork panel or a formwork, the deformable strips will deform such under the applied weight that at least on the side of the formwork or the formwork panel where concrete is poured, the nearest edge concerned of said one or several deformable strips will extend up to the edge of this side of the formwork or the formwork panel, so that a seamless or nearly seamless transition is obtained there between the respective deformable strip and the formwork or the formwork panel. Naturally, such an embodiment is advantageous in that a perfect finish is obtained on the base. The deformable strips may be adjusted depending on the application, for example by proceeding by trial and error or by calculating their deformation in advance or by determining it with the known techniques on the basis of the loads that are exerted on the respective deformable strip or strips.

In order to better explain the characteristics of the invention, the following preferred embodiment of a formwork and accessory for a formwork or formwork panel is represented by way of example only without being limitative in any way, with reference to the accompanying figures in which: figure 1 represents a framework of a formwork panel according to the invention;

figure 2 represents a section of the profiles indicated by arrows F2A and F2B in figure 1 ;

figure 3 shows a view in perspective of a part of the framework according to figure 1 with deformable strips provided in one of the profiles;

figure 4 shows a section of the profiles indicated by arrows F2A and F2B in figure 1, but in this case with applied deformable strips;

figure 5 is a view in perspective of an accessory for a formwork or formwork panel according to the invention; figures 6 to 8 represent an alternative for the section of figure 2, for the application of deformable strips respectively, after deformable strips have been provided and after the deformable strips have been deformed under the applied loads when using the formwork panel; and,

figures 9 to 11 represent, in an analogous manner as in figures 6 to 8, sections of an alternative embodiment of an accessory according to the invention.

Figure 1 represents a framework 1 of a formwork panel, which framework 1 is built in this case of two vertically represented supports 2A and 2B and three horizontally represented supports 3A, 3B and 3C.

It is clear that, irrespective of the size of the framework 1, more or less supports can be provided. The form plate, which is not represented for clarity's sake, is provided on one of the lateral faces of the framework 1.

The circumferential dimensions of the form plate substantially correspond to the circumferential dimensions of the framework 1.

The crosscut sides 4A-4D of the framework 1 together with the crosscut sides of the form plate form the crosscut sides of the formwork panel. Figure 2 represents a section of the profiles used for the support 2B represented on the right and standing upright in figure 1 and for the support 3A represented on the top and lying.

As the section illustrates, these supports 2B and 3A have an outer wall or casing 5 with a rectangular section, having two short sides 5A and 5B of 60 millimeters in this case and two long sides 5C and 5D of 120 millimeters in this case.

One of the long sides, in this case side 5D, is provided with two interruptions 6A and 6B, providing the profiles with two grooves 6' and 6' ' .

These interruptions 6A and 6B give access to the inner space 7 in the casing 5.

However, this inner space 7 is divided here in four subspaces 7A to 7D. Internal ribs 8 are provided to this end, i.e. one internal rib 8A parallel to the long sides 5C and 5D and at a distance of 20 millimeters from the long side 5D in this case, and two internal ribs 8b and 8C parallel to the short sides 5A and 5B, both at a distance of 30 millimeters from the nearest bordering short side 5A and 5B respectively.

All this results in that the interruptions 6A and 6B respectively give access to the inner subspace 7A and the inner subspace 7B. The above-described supports 2B and 3A with grooved profiles are built together in an appropriate manner with the other supports 2A, 3B and 3C, which are built in this case of conventional rectangular sockets.

All supports are made of aluminum in this case. Neither the specified dimensions, nor the choice of materials is restrictive . In each of the grooves 6' and 6' ' is provided a deformable strip 9, in this case in the shape of an extruded rubber strip 9 with, seen as a cross-section, an octagonal chamber 10 on the one hand and a rectangular element 11 connected to the latter on the other hand, which is provided with two fins 12A and 12B in this embodiment.

It is clear, however, that one or both fins 12 can be omitted and/or can be replaced by other widenings and/or that several widenings or fins can be provided.

All this is represented in figures 3 and 4.

Figure 3 shows a part of the framework 1 with deformable strips 9 applied in the support 2B represented horizontally in figure 3. Note that the framework 1 is oriented differently here compared to figure 1.

Figure 4 shows a section of the supports 2B and 3A with deformable strips 9 provided in the grooves 6' and 6' ' .

In order to fix it to the framework 1, the deformable strip 9 is partially introduced in the chamber 7A or 7B and extends partially beyond the wall 5, through the interruptions 6A and 6B .

The operation of such a formwork panel comprising a framework 1 as described is simple and as follows.

A formwork is built by means of one or several of such formwork panels, wherein at least one deformable strip 9, in this case the protruding parts of the extruded rubber strips 9 in the shape of the octagonal chamber 10, is or are placed on the base.

A formwork panel comprising a framework 1 as described can be placed on the base in two manners, namely upright or lying, in other words with the vertical supports 2B or with the horizontal support 3A resting on the base.

The possibly bordering formwork panels are connected to each other, a reinforcement may be provided in the space to be delimited and concrete is poured.

The concrete cannot seep away at the bottom, nor a watery cement solution, and neither can pollution end up in the delimited space via the outside.

Therefore, the rubber strips 9 fit up too close to the base, even if it is uneven.

Indeed, where the pressure is highest, the protruding part of the deformable strip 9, here in particular the octagonal chamber 10, is almost entirely compressed. It is clear that the pressure is highest where the base protrudes most upward.

The octagonal chamber is thereby very suitable since the deformation evolves substantially such that the standing lateral walls are laterally moved practically undeformed.

Also the bottom side remains directed downward substantially undeformed.

The deformation mainly occurs at the angular points which act as hinges as if it were.

Where the base is somewhat lower, the pressure on the deformable strip 9 will be lower and, consequently, the latter will be less deformed and thus reach lower, and thus prevent openings being formed between a formwork panel and the base. Even in those places, the standing side walls remain quasi undeformed and oriented upward.

Figure 5 shows an accessory 13 with a formwork or formwork panel .

The accessory 13 with a formwork or formwork panel mainly concerns a flat slat, made in this case as an extruded aluminum profile. The section of the profile as represented substantially corresponds to the section of the profiles used for the above-discussed supports 2B and 3A, with some major differences .

As is clear from the cross-section, this profile differs from the section represented in figure 2 and 4 in that two extra internal ribs 8D and 8E are provided.

The inner rib 8D is provided between the interruption 6A and the nearby short side 5A, whereas the inner rib 8E is provided between the interruption 6B and the nearby short side 5B .

The section also has a rectangular outer wall or casing 5 with two short sides 5A and 5B of 30 millimeters in this case and two long sides 5C and 5D of 120 millimeters as well .

In other words, the profile used for the accessory 13 for a formwork or formwork panel according to figure 5 has a smaller total height compared to the profile represented in figures 2 and 4.

Further, the two short sides 5A and 5B are provided with recesses 14, for example every 1 ½ meter.

The accessory 13 for a formwork or formwork panel is also provided with deformable strips 9.

The use of the accessory 13 for a formwork or formwork panel is simple and primarily intended to be used as an aid with existing formwork panels. Indeed, by first providing an accessory 13 for a formwork or formwork panel according to the invention on the base, and thereon an available conventional formwork panel, substantially the same result is obtained as when using a formwork panel according to the invention as described above and as represented in figures 1 to 4.

In order to prevent the accessory 13 for a formwork or formwork panel to be laterally moved, for example after the pouring of the concrete and the pressure exerted thereby, coupling means such as clamps, which are not represented, may be provided to connect the accessory 13 to the conventional formwork panel placed upon the latter. Optionally, the coupling means may be partly placed in the recesses 14 and partly co-operate with the formwork panel placed thereon.

Neither for a formwork panel, nor for an accessory 13 for a formwork or formwork panel according to the invention, the deformable strips 9 must be provided with an octagonal chamber 10.

The part that makes contact with the base can take many forms, such as for example round or oval or any polygonal shape .

Neither is it required that a part of the deformable strip 9 is provided in a groove 6' or 6' ' . Optionally, a deformable strip 9 may be connected to a profile in some other way, for example glued or screwed. It is also clear that neither the profiles of the framework 1 of a formwork panel on which deformable strips are provided, nor the profile which is used for the accessory for a formwork or formwork panel should be executed as described above.

The advantage of grooved profiles being provided, combined with a deformable strip 9 which is partly provided in the groove 6' or 6' ' and partly reaches beyond is that the deformable strip 9 can thus be easily removed, for example for cleaning or replacement.

All this results in that the elements according to the invention, i.e. a formwork panel or an accessory 13 for a formwork or formwork panel, can be used more than once and are particularly suitable for professional use on construction sites.

Figure 6 represents a section of a support 20 and a form plate 21 which together form a part of a formwork panel 22 according to the invention.

The support 20 this time consists of a hollow, extruded, longitudinal profile 22 with an outer casing 23 comprising a portion 24 with a predominantly rectangular section, formed of two short sides 25 and 26 and two long sides 27 and 28.

On the long side 28 which forms the side of the support 20 which is intended to be possibly placed on a base, the outer casing 23 is widened, wherein a lateral portion 29 is provided on the portion 24 with a rectangular section extending along the length of the profile 22.

The top side 30 of this lateral portion 29 is flat, with a width I equal to the width J of the form plate 21, and this flat portion 31 serves as a support for the form plate 21.

This shape of the support 20 is advantageous in that the form plate 22 is embedded in the latter so to say and is supported by it.

The support 20 is further provided, on the long side 28, with two grooves 32 and 33 having a T-shaped inner profile, extending in particular along both side edges 34 and 35 of the profile 22.

The T-shape is obtained by means of hook-shaped portions 36 directed towards each other and which are connected to each other via a bottom 37.

The lateral portion 29 hereby largely forms the groove 32, whereas the groove 33 is formed by portions of the opposite corner edge 38 of the profile 22.

Figure 7 illustrates how deformable strips 9, which further have a shape which is entirely equal to the shape of the deformable strips 9 from figure 4, can be provided in the grooves 32 and 33. is important to note that, according to the invention, intermediate distance D between the outermost edges 39 of the deformable strips 9 is larger than or equal to 75% of the width B of the respective crosscut side 40 of the formwork panel 22. According to the invention, the height H of the deformable strips 9 is smaller than one third of that intermediate distance D.

In a preferred embodiment of a formwork panel 22 according to the invention, the deformable strips 9 are such that, after their application to a formwork panel 22, they will only extend with a limited thickness F past the crosscut side 40 concerned. This thickness F preferably amounts to not more than 4 cm, for example, more preferably not more than 3 cm and most preferably not more than 2 cm.

All this contributes to a stable arrangement of the formwork panel 22 and prevents leaks.

Figure 7 represents the unloaded and thus non-deformed condition of the deformable strips 9, whereas figure 8 schematically represents what the deformable strips 9 preferably look like after being deformed according to the invention .

More specifically, everything is preferably such that when using the formwork panel 22 under the applied weight, the deformable strips 9 will deform in such a way that at least on the side of the formwork panel 22 where concrete is poured, i.e. in this case on the side 41 with form plate 21, the nearest edge 39 concerned of the deformable strip 9 concerned will extend up to the edge 34 of this side of the formwork panel 22, such that a seamless or practically seamless transition is obtained there between the deformable strip 9 concerned and the formwork panel 22.

In the case of figure 8, in the deformed condition, the intermediate distance D between the outermost edges 39 is enlarged to the width B of the formwork panel 22.

In practice, however, the deformation may deviate slightly from what is shown as an example in figure 8. Figures 9 to 11 show an accessory 42 to be applied with a formwork or formwork panel.

This accessory 42 mainly forms, as in the previous cases, a straight slat-shaped element with a substantially rectangular section 43 formed of lateral faces 44 and 45 which are wider than the side edges 46 and 47.

The accessory is one of the wider lateral faces 45 provided with two grooves 32 and 33 with a T-shaped inner section whose shape corresponds exactly to the grooves 32 and 33 from figures 6 to 8.

However, the accessory is not made hollow, although it is not excluded according to the invention, but it forms a full core 48. The accessory 42 with the full core 48 has no lateral portion 29 as in figures 6 to 8, since it is designed to be mounted under an existing formwork panel which is already composed of supports and a form plate.

Further, in an entirely analogous way as in figures 6 to 8, deformable strips 9 can be provided in the grooves 32 and 33. The intermediate distance D between the outermost edges 39 of these deformable strips 9 is in an analogous way larger than or equal to 75% of the width B of the wider lateral face 45 concerned of the straight slat-shaped element 42, and the height H of the deformable strips 9 is smaller than one third of said intermediate distance D.

On the wider lateral face 44, the accessory 42 is also provided with a groove 49 having a T-shaped section which serves to provide coupling means 50 in, having the shape of hammer head bolts 51, by turning them according to arrow K.

Naturally, this illustrates only one of the many ways to achieve such coupling means 50 for coupling the accessory 42 to a formwork panel.

In the preceding examples, each time two grooves 32 and 33 are applied with accompanying deformable strips 9. In other embodiments, however, more or less grooves or strips can be applied. For example, only one deformable strip 9 can be applied which is provided in one, two or several grooves, or several deformable strips 9 can be provided in separate grooves .

However, according to the invention it is important to restrict the thickness F over which such deformable strips 9 protrude from the formwork panel 22 or the accessory 42 as much as possible to prevent any lateral protuberance of the latter.

Further, the intermediate distance D between the outermost edges 39 on said one or several deformable strips 9 must be kept as large as possible, compared to the width B of the formwork panel 22 or accessory 42 concerned, and in the loaded, deformed condition, this intermediate distance D must be as close as possible to said width B.

It is clear that the profiles may be optionally made of plastic, for example by using extrusion techniques, and that one or several deformable strips can be provided by means of co-extrusion.

Thus is created a profile which, on the one hand, is mainly made of a less deformable material and which, on the other hand, is made of a relatively more deformable material, in particular to form one or several deformable strips . It is clear that the dimensions and proportions do not limit the scope of protection of the claims in any way. Further, it should be noted that the panels are intended to be provided with two rubbers at the bottom or sideways.

Once the concrete works are advanced so much that the rubbers are no longer required, for example in the case of concrete works at higher levels, these panels do not have to be sent back to the supplier, but the rubbers can be simply removed and one can simply continue to use the same panels .

The invention is by no means restricted to the embodiment of a formwork or accessory for a formwork or formwork panel according to the invention, described by way of example only and represented in the accompanying figures; on the contrary, such a formwork or accessory for a formwork or formwork panel according to the invention can be made in many different ways while still remaining within the scope of the invention.

Claims

Claims .

Formwork panel or accessory for a formwork or formwork panel, wherein a formwork panel comprises lateral faces and crosscut sides and wherein an accessory for a formwork or formwork panel mainly consists of a straight slat-shaped element with lateral faces which are wider than the side edges, characterized in that in the case of a formwork panel at least one of the crosscut sides is provided with one or several deformable strips (9), and in the case of an accessory for a formwork or formwork panel at least one of the wider lateral faces is provided with one or several deformable strips (9), wherein the intermediate distance (D) between the outermost edges of one or several of said deformable strips (9) is larger than or equal to 75% of the width

(B) of the crosscut side concerned of the formwork panel or of the wider lateral face concerned of the straight slat-shaped element, depending the case, and wherein the height (H) of one or several of said deformable strips

(9) is smaller than one third of said intermediate distance (D) . 2. Formwork panel (22) or accessory (42) for a formwork or formwork panel, characterized in that one or several of the deformable strips (9) is or are such that when using the formwork panel (22) or the accessory (42) in a formwork panel or a formwork under the applied load, the deformable strips (9) deform in such a way that at least on the side (41) of the formwork or the formwork panel where concrete is poured, the nearest edge (39) concerned of one or several of said deformable strips (9) will extend up to the edge (34) of this side (41) of the formwork or the formwork panel (22), such that a seamless or practically seamless transition between the deformable strip (9) concerned and the formwork or the formwork panel (22) is obtained.

Formwork panel according to claim 1, characterized in that at least one of the crosscut sides is provided with at least one groove or the like (6',6'') in which at least a first portion of a deformable strip (9) is or can be provided and wherein in that case a second portion of a deformable strip (9) will reach beyond the groove or the like (6',6'') and beyond the crosscut side .

Accessory for a formwork or formwork panel according to claim 1, characterized in that at least one of the wider lateral faces is provided with at least one groove (6',6'') in which at least a first portion of a deformable strip (9) is or can be provided and wherein in that case a second portion of a deformable strip (9) reaches beyond the groove or the like (6',6'') and beyond the wider lateral face.

Accessory for a formwork or formwork panel according to claim 1 or 4, characterized in that at least one of the side edges is provided with one or several recesses (14) whose dimensions and embodiment are suitable for providing coupling means therein.

6. Deformable strip which can be used in a formwork panel according to claim 1 or 2, or which can be used in an accessory for a formwork or formwork panel according to claim 1 or 3 or 4, characterized in that the deformable strip (9), seen in cross-section, comprises a deformable chamber on the one hand, and an element (11) connected to the latter on the other hand which is provided with one or several fins (12A, 12B) or widenings or the like. 7. Deformable strip according to claim 6, characterized in that the deformable strip is such that, after it has been applied to a formwork panel or to an aforesaid accessory, it will reach with a thickness (F) of preferably not more than 4 cm, more preferably not more than 3 cm and most preferably not more than 2 cm beyond the crosscut side (40) concerned of the wider lateral face (45), depending the case.

8. Deformable strip according to claim 5, characterized in that the deformable chamber concerns an octagonal chamber (10) .