EP2439351B1 - Bottom plate formwork - Google Patents

Description

The present invention relates to a bottom plate formwork with bottom and edge panel elements made of a thermally insulating material, which are interconnected.

Due to the increasing demands on the thermal insulation of buildings, more and more buildings are being erected on a slab formwork made of a thermally insulating material. To be able to produce a concrete floor slab, the surface to be covered by the slab is laid out with slab elements onto which the concrete floor slab is poured. In order to insulate the front sides of the bottom plate against heat losses, edge-side panel elements are set up in addition to the bottom-side panel elements, which serve as a permanent formwork for the production of the bottom plate. A lateral formwork for the bottom plate is from the font DE 94 22 074 U1 known. The formwork panels are connected to each other via a tongue and groove connection. Further formwork elements are from the writings DE 298 02 915 U1 and DE 20 2009 017 284 U1 known.

In order to connect the bottom and edge panel elements together, it is customary to glue them. Since the adhesive bond alone is often not sufficient to keep the weight of the cast concrete of the bottom plate on the sides, the bottom-side panel elements are to be placed on the edge panel elements, provided with a precisely tailored cutout to cut into the cutout To adjust the edge panel elements, so that in addition to the adhesive connection still results in a positive force component to withstand the weight of the cast concrete. A corresponding bottom plate formwork with tongue and groove joints between the floor and side shuttering panels is in the Scriptures EP 2 080 837 A2 disclosed.

The milling of the recesses for the edge panel elements in the bottom panel elements is extremely expensive and time consuming. This work can not normally be done on the construction site, but must be done in a tool-fitting workshop. For milling, the building plan must be known, and the individual panel elements must be arranged in a plan as needed, then machined and numbered so that they can be assigned to their proper installation position at the construction site. This also makes the processing of the panel elements on the construction site complicated and time consuming. Subsequent corrections are difficult.

It is the object of the present invention to provide a bottom plate formwork, which has a sufficiently strong connection between the bottom and edge panel elements and can be easily produced on site.

The object is achieved for a generic floor slab formwork by the bottom-side panel elements with the edge panel elements and one corner forming marginal panel elements are screwed together via corner connector elements, the screw connections are sufficiently resilient to hold the filled for the production of the bottom plate sideways, so that the corner connector elements as the only component to absorb the pressure of the cast concrete and the edge panel elements in their formwork target position hold.

The inventive design, a kit is created in which it is sufficient for the production of a bottom plate formwork initially interpreted along the edge of the bottom plate to be produced, the bottom-side panel elements. Then, the edge-side panel elements can be placed on the bottom-side panel elements to then screw together the bottom side with the edge panel elements and forming a corner edge panel elements on the corner connector elements together. The fittings can be made quickly and easily. The screw connections are also sufficiently strong to hold the filled to produce the bottom plate concrete sideways. Depending on the height of the base plate to be produced and the associated thrust forces against the edge panel elements, the number of corner connector elements to be mounted per running meter can be varied as needed. After the production of the formwork edge of the interior of panel elements can be designed to complete the bottom plate formwork.

By producing the floor slab formwork on the construction site, the detailed preparation work away from the construction site can be omitted. The logistics and assembly on the construction site is considerably simplified. By eliminating the costly pre-planning, the floor slab formwork can be created much faster and cheaper. Any necessary adjustments to the dimensions of the processed panel elements can be made directly on site. Thus, it is also possible to react flexibly on the construction site if deviations of the plans from the actual conditions or wishes are found there.

For the production of floor slab formwork is much less waste, as can be dispensed with the usual milling and the resulting waste volumes. Anchored panel elements can often still be used as filling material at interfaces, so that there are hardly any residual quantities. After all, building materials dealers can dispense with expensive processing tools and limit themselves to stocking and delivering only the panel elements, corner connector elements and the required screws and, if necessary, insulating dowels.

According to one embodiment of the invention, the panel elements are made of an extruded polystyrene and the screw is made via screwed into the polystyrene and provided with an external thread insulation dowels. Such insulation dowels can transmit very high holding forces in the polystyrene material over appropriately sized external thread. Even with larger forces acting in this type of screwing is not to be feared that the dowels are overloaded and torn.

According to one embodiment of the invention, a corner connector element has at least two interconnected via a connecting plate support plates, which are each mounted on an associated panel member and which are at a right angle to each other, each support plate at least two holes for each carrying a screw and the holes having surrounded support surface. By such a corner connector element standardized connections can be made. Each platen is associated with a panel element with which the platen can be screwed. The simple placement of the support plates on the associated panel element no further processing or pretreatment of the panel elements are required. Due to the right angle, in which the support plates are related to each other, the lateral end faces of the bottom plate are given cleanly forcibly. This increases the quality of construction. By at least two holes per platen is also ensured that a panel element can not subsequently turn away or skew.

By the bearing surface surrounding the holes, a flat counterforce to the screw with the insulation dowel can be applied to the surface of the insulating material, although the heat-insulating material is punctually only slightly resilient. The support surface comes through the screw in the immediate vicinity of the insulation dowel to rest with the panel element. About the insulation dowel and the screwing of the insulation plug with the support surface holding forces are also transferred to the depth of the panel element, so that by the addition of the support surface and the associated insulation dowels transferred holding forces an overall unexpectedly high strength of the connection can be achieved. The connection of the two support plates via a connecting plate creates a single corner connector element, which receives the pressure of the cast concrete as a single component and holds the edge panel elements in their formwork target position. By reducing the connection of the panel elements on a single component assembly is simplified because only this one component must be kept in sufficient numbers and processed.

According to one embodiment of the invention, the support plates are at a right angle to the connecting plate. The right-angled design inevitably results in right-angled installation positions of the panel elements relative to one another, wherein the forces acting on the panel elements through the poured-in concrete are optimally transmitted via the connection panel.

According to one embodiment of the invention, the corner connector element is made of a plastic or a corrosion-protected metal. Since the corner connector elements are processed in the edge region of the bottom slab formwork, they are at risk of coming into contact with moisture penetrating from the side or from the ground. With unprotected metallic materials, this creates a risk of corrosion. The use of plastics or protected metallic materials such as galvanized iron or stainless steel safely eliminates the risk of corrosion. In addition, especially made of plastic corner connector elements are inexpensive to produce and easily portable due to their specific low weight in larger quantities.

According to one embodiment of the invention, the insulation dowels are pre-assembled ready for construction screwed into the panel elements. By pre-assembling the insulation dowels in the panel elements, the holes for the insulation dowels can be pre-drilled factory-efficiently and positioned so accurately that a millimeter precision plant the panel elements together, when the screws are screwed with the corner connector in the insulation dowels. On the construction site itself, the production of floor slab formwork is simplified because there are no holes drilled holes and insulation dowels must be screwed into the material of the panel elements. It is advantageous to provide the insulation dowels only along a long side of the panel elements along, since the panel elements must be connected only at one long side as a bottom-side panel elements with the edge panel elements. Adjustments in the dimensions of the panel elements can then be made on the side of the panel elements on which no insulation dowels are screwed. In the proposed pre-assembly of insulation dowels, it is only necessary in exceptional cases on site to provide individual panel elements with insulation dowels at special points. However, this is possible quickly and without much effort for the few residual points to be set individually, since the heat-insulating material of the panel elements can be easily processed.

It is expressly understood that the features of the embodiments described above can be combined with each other in any way, but also with each other in any way.

Further modifications and embodiments of the invention will become apparent from the following objective description and the drawings.

Fig. 1:

eine Ecke einer Bodenplattenschalung,

Fig. 2:

eine Detailansicht des Kreises II in Fig. 1.

The invention will now be described with reference to an embodiment. Show it:

Fig. 1:

a corner of a floor slab formwork,

Fig. 2:

a detailed view of the circle II in Fig. 1 ,

In Fig. 1 exemplified how a corner of a bottom plate formwork can be configured according to the invention. On the floor, a bottom-side panel element 4 is designed. On two sides we limited the bottom-side panel element 4 of edge panel elements 6. The edge-side panel elements 6 project beyond the surface of the bottom-side panel element 4 by the height dimension of the concrete floor slab to be cast. In the abutting region, the bottom-side panel element 4 is connected via Eckverbinderelemente 8 with the edge-side panel elements 6. The screwing of the corner connector elements 8 with the bottom side and in both edge panel elements is indicated by dots. It is understood that any number of further bottom-side panel elements 4 can be applied to the one shown bottom-side panel element 4, so as to interpret the underside of the base plate to be produced and to insulate against heat losses. It is also possible, the edge formwork for the base plate to be produced by further to the bottom-side panel elements 4 employees edge panel elements 6 produce. By the corner connector elements, the edge panel members 6 are held in a vertical position when liquid concrete is poured into the bottom plate formwork 2. The compressive forces exerted by the freshly poured concrete in the lateral direction on the edge-side panel elements 6 are transmitted via the corner connector elements 8 in the bottom-side panel elements 4.

In the exemplary embodiment, a total of three corner connector elements 8 are shown for the connection of the bottom panel element 4 with the two edge panel members 6, depending on the thickness of the base plate to be produced and the technical design of the corner connector elements 8 more or less corner connector elements 8 per running meter to be created formwork can be provided ,

In Fig. 2 is an enlarged view of the in Fig. 1 shown with the circle II connection area between the bottom-side panel element 4 and a marginal panel member 6 shown. In the enlarged view in Fig. 2 it can be seen that in the bottom-side panel element 4, a single insulation dowel 10 is indicated, which is already screwed into the bottom-side panel member 4. The further insulation dowels 10 are not shown, but in erfindungsmäß designed panel elements 4, 6 available. On the surface of the bottom-side panel member 4 and the edge-side panel member 6, a support plate 12 is placed in each case, each of which is part of the corner connector element 8. The support plates 12 each have two holes 14, screwed by a screw 16 in the located in the respective panel elements 4, 6 insulation dowels can be. The two support plates 12 are interconnected by a connecting plate 18, via which the holding forces between the two support plates 12 is transmitted. From the Fig. 2 It can be seen that both the support plates 12 are arranged in relation to the connecting plate 18 and the support plates 12 to each other at a right angle.

The invention is not limited to the embodiment. It is not difficult for the person skilled in the art, with the aid of the expertise available to him, to adapt the invention to a specific application which he considers suitable.

Claims (6)

1. Bottom plate formwork (2) comprising bottom and edge board elements (4, 6) that are made of a heat-insulating material and are interconnected, characterised in that the bottom board elements (4) are screwed to the edge board elements (6), and the edge boards elements (6) that form a corner are screwed to one another by means of corner connection elements (8), the screw joints having sufficient load-bearing capacity to laterally support the concrete poured in for producing the bottom slab, such that the corner connection elements (8), as the only component, absorb the pressure of the concrete poured in and support the edge board elements (4) in the desired formwork position thereof.
2. Bottom plate formwork (2) according to claim 1, characterised in that the board elements (4, 6) are made of an extruded polystyrene, and the screwed connection is established by means of insulation plugs (10) that are screwed into the polystyrene and provided with a male thread.
3. Bottom plate formwork (2) according to either claim 1 or claim 2, characterised in that a corner connection element (8) comprises at least two bearing plates (12) interconnected by means of a connection plate (18), which bearing plates can each be placed on an associated board element (4, 6) and are at right angles to one another, each bearing plate (12) comprising at least two holes (14), through each of which a screw (16) is intended to be guided, and a bearing surface surrounding the holes (14).
4. Bottom plate formwork (2) according to claim 3, characterised in that the bearing plates (12) are at right angles to the connection plate.
5. Bottom plate formwork (2) according to any of the preceding claims, characterised in that the corner connection element (8) is made of a plastics material or of a corrosionresistant metal.
6. Bottom plate formwork (2) according to any of the preceding claims 2 to 5, characterised in that the insulation plugs (10) are screwed into the board elements (4, 6) in a pre-assembled manner so as to be ready for use on a building site.

Images