DE29922263U1 - Recess body for concrete ceilings - Google Patents

Description

The innovation relates to a recess body for concrete ceilings according to the preamble of patent claim 1.

When constructing concrete ceilings, it is necessary to create a continuous recess in order to create a passage for, for example, installation pipes, cables, tubes and integrated components or the like.

In order to create such a recess in a precast ceiling, it was first necessary to provide a corresponding recess in the precast slab at the location provided for this purpose and in the correct position.

This precast ceiling was then brought to the construction site and installed. After the precast ceiling has been installed, it is known to pour a layer of in-situ concrete, which is the concrete that is applied on site, into this precast ceiling in order to

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This makes it possible to achieve a total height of the finished ceiling of, for example, 200 mm, although the prefabricated ceiling only has a height of 50 mm.

In order to create this recess in the prefabricated ceiling, it was therefore necessary to place a corresponding formwork box on the recess in the prefabricated slab, whereby the formwork box was manufactured on site from wood.

Such a formwork box consisted of a self-contained, roughly cube-shaped body that was open at the bottom so that its lower, open side could be placed on the recess in the precast slab. The upper side (cover surface) of this body was missing, so a surrounding wooden frame was placed on top of this precast slab as formwork. The precast slab was then poured with the in-situ concrete layer, with the box, which was open at the top and bottom, keeping the recess free. This resulted in a continuous recess in the concrete slab after the in-situ concrete layer had hardened.

For accident prevention reasons, this continuous recess had to be closed off with a separate cover at least from above.

Furthermore, it was necessary to remove the wooden frame from the finished ceiling for structural reasons, as such wooden parts tend to decompose after a long time and would cause damage to the building. The wooden frame was therefore knocked out again at a relatively high cost.

The corresponding ducts and fittings could then be installed in the continuous recess, with installation pipes, for example, being led through this recess.

After the installations were completed, the recesses had to be closed again. To do this, it was necessary to add a bracing from below, i.e. a formwork panel was attached from below

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and from above, a corresponding filling concrete was poured into the recess in order to close this recess again.

It is obvious that this method of creating a continuous recess in a concrete ceiling required a very high amount of work.

According to another prior art, it is known to produce such a recess in such a way that a corresponding polystyrene foam body is placed on the precast slab, which is then poured with in-situ concrete to also form a recess. Here, too, there is the disadvantage that the foam body has to be knocked out relatively laboriously after the in-situ concrete ceiling has set, which results in a lot of waste and involves a lot of work. There is also the further disadvantage that after the installation parts have been inserted, the subsequent closing of this recess by pouring filler concrete is difficult, because here, too, a formwork panel has to be attached from below and the recess has to be filled with filler concrete from above against the formwork panel.

The innovation is therefore based on the task of creating a recess body which makes it possible to form a recess in a concrete ceiling of the type mentioned at the beginning in such a way that it can be manufactured much more easily and cost-effectively and that it enables much simpler subsequent processing steps.

To solve the problem posed, the innovation is characterized by the technical teaching of claim 1.

The essential feature of the innovation is that a recess body is present as a hollow body which is closed all around and which has at least one base surface and a removable or easily destructible cover surface (lid) opposite the base surface.

This technical teaching has the significant advantage that the recess body is now defined as a lost formwork body, which therefore remains in the layer of the ceiling that is cast with in-situ concrete, whereby it is important that this recess body has a base and an opposite, removable or easily destructible cover.

The arrangement of a base has the advantage that when the recess is closed again, i.e. when the installation parts have been led through, the laborious process of removing the filler can be dispensed with - because the filling concrete can be poured directly from above into the recess body with the cover removed, which means that it is no longer necessary to hold it in place from below with a formwork plate and to seal the filling concrete against leaking out.

This saves a significant amount of work.

The arrangement of a removable cover has the further advantage that the accident regulations are taken into account with this cover, because it is not necessary to cover such recesses on site with formwork panels and similar aids, but rather a form-fitting cover is provided for the recess body, which is removed when the installation parts are installed and which only serves to cover the recess as long as the recess body has not yet been filled with filling concrete.

Any hollow body can be used as a recess body, provided that it only has to meet the minimum requirements mentioned above, namely a surrounding side wall and a floor wall as well as an opposite, removable ceiling wall.

The recess body can be shaped in any shape. The recess body can be a cubic or rectangular hollow body, it can also be cylindrical, elliptical or have any other hollow shape, such as a tetrahedron or similar hollow bodies.

In a first embodiment of the innovation, it is provided that the recess body is a one-piece body in which the cover is not removable because the cover is connected to the side walls in one piece. If the cover has fulfilled its covering function and the installation parts that pass through the recess are now to be installed, the cover can be destroyed. It is therefore not absolutely necessary for the cover to be removable.

However, in a further embodiment of the innovation, it is provided that instead of a one-piece recess body, a two-piece recess body with a removable cover is provided.

In a third embodiment of the innovation, the recess body is designed in two parts in such a way that a lower box is provided which has a closed bottom surface, into which lower box an upper box engages slidably with its downwardly directed opening, whereby the upper box in turn has a cover surface which is closed relative to the bottom surface of the lower box. For this embodiment, too, the cover surface is either designed as a removable lid without the cover surface being firmly connected to the upper edge of the upper box and can only be destroyed by knocking it out.

Any material that is capable of remaining in a concrete ceiling as permanent formwork for many years can be considered as a material for such a recess body. It is therefore preferred if the recess body is made entirely of glass fiber concrete, normal concrete or another mineral material. It is also claimed that the recess body is made of plastic, metal or other non-rotting materials.

The design of the recess body with an upper box, which engages in a lower box adjustable, has the advantage that the height of the

The recess body can be adjusted to any position. The displacement between the upper and lower box is designed to be lockable, whereby a locking rail or other locking means can be used.

Instead of a locking rail, other means of securing the upper and lower boxes can be provided, such as the shape that allows

At the desired height, a screw or a split pin is driven through the side wall of the lower box, which penetrates the side wall of the upper box so that the displacement of the two boxes relative to each other is fixed.

Of course, the two boxes can also be glued, welded or otherwise locked together on site.

This makes it possible to produce the in-situ concrete slab or the element slab in variable slab thickness, whereby the upper edge of the recess body is always flush with the upper edge of the finished slab.

A further advantage of the height adjustability of the recess body is that when using such a recess body for precast concrete ceilings, the recess body is already inserted into the recess during the manufacture of the element ceiling (element plate in the factory) and already forms the recess in the element ceiling. So that the element ceiling can now be transported to the construction site with the recess body installed, it is preferable if the recess body is made as low as possible, so that the upper box can be pushed into the lower box so far that the upper edge of the upper box does not protrude beyond the lattice girder structure of the element ceiling, so that there is no risk of damage to the recess body during transport.

As soon as the precast slab has been installed on site, the upper box is pulled out of the lower box and placed at the required height of the

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later precast ceiling, so that the precast ceiling is then produced by pouring the in-situ concrete layer.

This is therefore a recess body for concrete ceilings to create a breakthrough in a concrete ceiling, whereby the recess body is positioned accordingly, fastened and then cast with the concrete ceiling, whereby the recess body is designed as a hollow body that is closed all around and has at least a base and a cover opposite the base, and at least its side walls remain permanently and firmly in the concrete ceiling. The base has one or more predetermined breakthrough points that can be broken through accordingly after the concrete ceiling has been completed. This creates passages through which the installation lines and the like can be led through. The rest of the base remains standing and forms the formwork part already described for closing the ceiling after the installation work by pouring concrete. The recess body therefore remains firmly arranged in the concrete ceiling. The cover of the recess body is so stable that it is at least tread-proof, thus ensuring that further work steps can be carried out through the ceiling without the risk of breaking through.

The subject matter of the present innovation arises not only from the subject matter of the individual claims, but also from the combination of the individual claims with one another.

All information and features disclosed in the documents, including the summary, in particular the spatial configuration shown in the drawings, are claimed as essential to the invention insofar as they are new compared to the prior art, individually or in combination.

The innovation is explained in more detail below using drawings that show only one way of implementing it. The drawings and their descriptions reveal further key features and advantages of the innovation.

Show it:

Figure 1: schematically shows a preferred embodiment of a recess body in a perspective side view,

Figure 2: Horizontal section through the recess body according to Figure 1,

Figure 3: Section along line III-III of Figure 2 through Fig. 1, 10

Figure 4: Installation of a recess body in an in-situ concrete ceiling, Figure 5: Installation of a recess body in a precast ceiling, Figure 6: Section through a cast recess in an in-situ concrete ceiling, Figure 7: another design of a recess body,

Figure 8: a third embodiment of a recess body. 20

Figure 1 generally shows a recess body 1 which consists of two boxes 2, 3 inserted into one another.

In this case, it is preferred if the lower box 2 is larger than the upper box 3, so that the upper box 3 is inserted into the lower box 2.

The lower box 2 consists entirely of circumferential side walls 8, which are preferably integrally connected to a closed base 7.

Of course, it is possible to create knock-out recesses in the floor, which are connected to the surrounding floor wall via predetermined breaking points. The rest of the floor remains as a load-bearing part.

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The upper box 3 in turn consists of a box-shaped hollow body which has circumferential side walls 5 which define a lower opening, which opening corresponds to the upwardly directed opening of the lower box.

On the inside of the side walls 5, locking rails 6 are arranged, which are supported on the bottom 7 of the lower box 2, as shown in the illustration in Fig. 3.

If the height 26 between the upper and lower boxes is to be changed, then, for example, the locking rail 6 is broken off at position 25 so that the fragment is removed and the locking rail 6 once again rests with its base on the floor 7.

Of course, other height fixing means between the upper and lower boxes 2, 3 are also possible.

The upper box 3 is covered by a lid 4, which is preferably detachably connected to the upper box 3 and which is completely removable.

It has already been pointed out in the general part that the cover 4 can also be firmly connected to the side walls 5.

Overall, the upper box 3 is adjustable in the direction of arrow 9 and is accommodated in the lower box 2.
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Figure 2 shows a plan view of the recess body 1 according to the invention with the cover 4 removed, whereby the base 7 with the predetermined breakthrough points 29 arranged therein is visible.

Figures 4 and 5 show two different installation examples for a recess body 1.

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In Figure 4, the recess body 1 is installed in an in-situ concrete ceiling 10, i.e. at the construction site, a complete layer of concrete is applied to a formwork (not shown here) so that the recess body 1 is completely cast into the in-situ concrete ceiling 10. It is important here that the height 26 of the recess body 1 is set so that the upper edge of the cover 4 is approximately flush with the upper edge of the in-situ concrete ceiling 10.

A similar representation is shown in Figure 5 in connection with an element ceiling 12. Here it can be seen that the recess body 1 is inserted into a recess 27 of a relatively thin element ceiling 12 and thus keeps the recess 27 free during the manufacture of the element ceiling 12.

The entire element ceiling 12 is now brought to the construction site with the lattice girder structure 28 and an in-situ concrete layer 13 is poured onto the element ceiling, whereby the lattice girder structure 28 is cast in.

It is now important that during the transport of the element ceiling 12 to the construction site, the upper box 3 is pushed into the lower box 2 so far that the cover lies approximately below the upper edge of the lattice girder structure, so that there is no risk of damage to the recess body 1 during transport.

As soon as the element ceiling 12 is assembled on the construction site and prepared ready for pouring, the recess body 1 can be adjusted in its height 26 to the required height by pulling the upper box 3 out of the lower box 2 and locking it at the required height 26. The in-situ concrete layer 13 is then applied, with the upper edge of the cover 4 again being approximately flush with the upper edge of the in-situ concrete layer 13.

Figure 6 shows the further processing, whereby the installation situation according to Figure 5 will no longer be discussed below, but only the installation situation according to Figure 4 will be explained. The installation situation according to Figure 5 applies analogously here.

After the recess has been made either according to Figure 4 or Figure 5, the cover 4 initially remains on the recess body and serves as an accident protection because the finished ceiling is thus easy to walk on and the recess is covered. 5

Figure 6 now shows the installation of two heat-insulated pipes 15, each surrounded by an insulating jacket 16. The floor 7 is then covered with

"corresponding recesses and the pipes 15 with their insulating jacket 16 are led through, whereby the recesses 17 can be slightly larger than the outer diameter of the insulating jacket 16.

The cover 4 was removed beforehand.

When the pipes 15 have now been guided through the recess, the recess can now easily be filled by pouring in filling concrete 14 from above, whereby the base 7 absorbs the filling concrete and prevents it from flowing out downwards.

This is a great advantage over the state of the art, because the state of the art had an open opening instead of a floor, which had to be closed by a separate formwork panel that was brought in from below. Attaching a formwork panel of this type was extremely difficult, especially in penetrations, because it had to surround parts that ran into the recess.

In addition, the formwork panel and its support had to be removed again. This is no longer necessary after the renovation and the floor 7 remains as permanent formwork in the recess.

Of course, the innovation is not limited to the installation of such pipes 15, but all other installations, fittings or even electrical parts can be installed in the manner shown.

Figure 7 shows another embodiment of a recess body 18, which is designed approximately as a can-shaped body and which has a cylindrical

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Lower box 19 which has a screw thread which corresponds to a screw thread in the upper box 20. In this way, the height 26 between the upper and lower boxes 19, 20 can also be adjusted.

Figure 8 shows as an embodiment a simple, one-piece or two-piece recess body, which essentially consists only of a pot-shaped recess body 23, the peripheral side walls of which are connected to a bottom wall and which has a fixed or removable cover 24.
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Furthermore, in the embodiment according to Figure 7, the cover 22 can be arranged either fixedly or removable.

Instead of the screw thread 21, locking knobs or locking marks can also be used.

In the embodiment according to Figure 8, it is assumed that the recess body 23 has a fixed height, so that depending on the ceiling thickness of the finished ceiling, recess bodies 23 of different heights must be used.

Drawing guide

I. Recess body 2. Bottom box

3. Upper box

4. Lid

5. Side wall

6. Locking rail 7. Floor

8. Side wall

9. Arrow direction

10. In-situ concrete ceiling

I1. Recess 12. Element ceiling

13. In-situ concrete layer

14. Filling concrete

15. Pipe

16. Insulating jacket 17. Recess

18. Recess body

19. Lower caste

20. Upper box

21. Screw thread 22. Cover

23. Recess body

24. Lid

25. Position

26. Height

27. Recess

28. Lattice girder structure

29. Predetermined breakthrough

Claims (15)

1. Recess body for concrete ceilings for creating an opening in a concrete ceiling, wherein the recess body is appropriately positioned, fastened and then cast with the concrete ceiling, characterized in that the recess body ( 1 ) is designed as a hollow body which is closed all around and which has at least one base ( 7 ) and a cover ( 4 , 22 , 24 ) opposite the base, and at least with its side walls ( 5 ) remains permanently and firmly in the concrete ceiling ( 12 , 13 ). 2. Recess body according to claim 1, characterized in that the bottom ( 7 ) of the recess body ( 1 ) also remains firmly in the concrete ceiling ( 12 , 13 ). 3. Recess body in concrete ceilings according to claim 1 or 2, characterized in that the floor ( 7 ) has one or more predetermined breakthrough points ( 29 ). 4. Recess body in concrete ceilings according to one of claims 1-3, characterized in that the base ( 7 ) of the recess body ( 1 ) is so stable that the recess body can be filled with concrete. 5. Recess body according to one of claims 1-4, characterized in that the cover ( 4 , 22 , 24 ) is removable or easily destructible. 6. Recess body in concrete ceilings according to one of claims 1-5, characterized in that the cover ( 4 , 22 , 24 ) of the recess body ( 1 ) is tread-resistant. 7. Recess body in concrete ceilings according to one of claims 1-6, characterized in that the recess body ( 1 ) consists of at least two parts which can be plugged into one another, a lower box ( 19 ) with a base ( 7 ) and an upper box ( 20 ) with a cover ( 4 , 22 , 24 ). 8. Recess body in concrete ceilings according to one of claims 1-7, characterized in that the upper box ( 20 ) with a cover ( 4 , 22 , 24 ) is adjustable in its distance from the lower box ( 19 ) with a base ( 7 ). 9. Recess body in concrete ceilings according to one of claims 1-8, characterized in that the distance between the lower box ( 19 ) and the upper box ( 20 ) is adjustable by means of a locking device ( 6 ). 10. Recess body in concrete ceilings according to one of claims 1-9, characterized in that the distance between the lower box ( 19 ) and the upper box ( 20 ) is adjustable by means of a screw device ( 21 ). 11. Recess body in concrete ceilings according to one of claims 1-10, characterized in that the recess body ( 1 ) can be pushed together to such an extent that its height does not protrude beyond the iron reinforcement of an element ceiling ( 12 ). 12. Recess body in concrete ceilings according to one of claims 1-11, characterized in that the recess body ( 1 ) is already firmly arranged in an element ceiling ( 12 ) onto which the in-situ concrete layer ( 13 ) is poured. 13. Recess body in concrete ceilings according to one of claims 1-12, characterized in that the recess body ( 1 ) consists of mineral materials. 14. Recess body in concrete ceilings according to one of claims 1-12, characterized in that the recess body ( 1 ) consists of concrete. 15. Recess body in concrete ceilings according to one of claims 1-12, characterized in that the recess body ( 1 ) consists of plastic.