Hollow body for the production of a concrete ceiling

Abstract

A hollow body (1) for producing a concrete ceiling or concrete wall (10) comprises a first half-shell (2) and a second half-shell (3) which abut each other at a contact surface and enclose at least one closed cavity, wherein the first half-shell (2) is held to the second half-shell (3) by means of fasteners (4), wherein at least one sealing element (25, 35) made of a material that has a higher elasticity than the material of the first half-shell (2) and / or the second half-shell (3) is provided at the contact surface. This allows the at least one closed cavity between the first half-shell (2) and the second half-shell (3) to be reliably sealed during the pouring of concrete.

Description

[0001] The present invention relates to a hollow body for producing a concrete ceiling or concrete wall, comprising a first half-shell and a second half-shell which abut each other with a contact surface and surround at least one closed cavity, wherein the first half-shell is held on the second half-shell by means of fastening means.

[0002] EP 2 516 763 B1 discloses a half-shell element for producing a hollow body, which has locking elements for connecting it to another half-shell element. Such hollow bodies made of half-shell elements are suitable for producing concrete slabs or walls and reduce their weight. If the half-shell elements are not connected properly, water and / or concrete can penetrate the cavity when the hollow body is cast, thus negating or reducing the desired effect of reducing the weight of the concrete slab or wall. This problem occurs with all two- or multi-part hollow bodies, such as those described in WO 2005 / 080704 A1 for a method of producing concrete components.

[0003] It is therefore an object of the present invention to create a hollow body for the production of a concrete ceiling and / or a concrete wall which, when poured, offers absolute protection against the ingress of water or concrete.

[0004] This problem is solved with a hollow body for producing a concrete ceiling or concrete wall with the features of claim 1.

[0005] The hollow body according to the invention for producing a concrete ceiling or concrete wall comprises a first half-shell and a second half-shell which abut each other with a contact surface and enclose at least one closed cavity, wherein the first half-shell is held to the second half-shell by means of fasteners and at least one sealing element made of a material that has a higher elasticity than the material of the first half-shell and / or the second half-shell is provided at the contact surface. The at least one sealing element can be composed of one or more circumferential or frame-shaped sections. This allows for improved sealing of the at least one closed cavity via the at least one sealing element, thus reducing or preventing the ingress of water or concrete into the hollow body.This ensures that the weight reduction calculated during construction planning is actually achieved.

[0006] The at least one sealing element is preferably bonded to the first or second half-shell. The at least one sealing element can be bonded or welded to an edge or rim of the first or second half-shell. Optionally, the at least one sealing element can also be integrally formed with the first or second half-shell, for example, if it is manufactured using a two-component process such as two-component injection molding.

[0007] For optimized sealing, a first sealing element can be provided on the first half-shell and a second sealing element on the second half-shell, which abut each other at the contact surface. This allows the two sealing elements to form a common sealing plane at the contact surface. Optionally, the first and second half-shells can be identical in design, which simplifies manufacturing and assembly.

[0008] In a further embodiment, the at least one sealing element can be formed by a coating on the first half-shell and / or the second half-shell. For example, a sealing bead made of foamed material can be applied to an edge or rim of at least one of the two half-shells. Alternatively, the at least one sealing element can also be manufactured as a separate molded seal, which is then mechanically fixed to the first half-shell and / or the second half-shell, for example by means of snap-fit ​​devices, or by a material bond.

[0009] The at least one sealing element is preferably arranged circumferentially, in a frame-like or circular manner on the first and / or second half-shell. The at least one sealing element can be applied to a flange of the half-shell, and several circumferential sealing elements can also be provided, including an outer sealing element and an inner sealing element, particularly if the half-shell is annular or has several hollow chambers.

[0010] Preferably, the shape of the at least one sealing element follows the shape of the rim or edge of the at least one half-shell where it connects with a second half-shell to form a hollow body.

[0011] Each sealing element preferably has a height perpendicular to a sealing plane of between 0.01 mm and 10 mm, particularly 1 mm and 3 mm, to be sufficiently elastic or sealing. The at least one sealing element can have a width perpendicular to a longitudinal extent of between 1 mm and 10 mm, particularly 2 mm and 5 mm.

[0012] The at least one sealing element may, for example, comprise or be made of EPDM, TPU, TPE or a foamed polyurethane, or comprise other elastic or viscoelastic or sealing materials.

[0013] A concrete ceiling or concrete wall preferably comprises a plurality of such hollow bodies, which can be arranged between an upper reinforcement grid and a lower reinforcement grid.

[0014] The invention is explained in more detail below with reference to an exemplary embodiment and the accompanying drawings. These show: Fig. 1 an exploded view of a hollow body according to the invention; Fig. 2A and Fig. 2B two views of the hollow body in a mounted position; Fig. 3 a perspective view of several hollow bodies before the pouring of concrete, and Fig. 4 a sectional view through a concrete ceiling with the hollow bodies according to the invention.

[0015] A hollow body 1 comprises a first half-shell 2 and a second half-shell 3, which are manufactured, for example, from plastic using thermoforming or injection molding processes. The first half-shell 2 comprises four shell elements 20, which are connected to each other via connecting webs 21. This creates an inner opening 24 within the shell elements 20, which in plan view have the shape of a quarter circle and are surrounded by a rim 22. On the outside of the half-shell 2, an outer rim 23 is formed in the form of an outwardly projecting flange.

[0016] The second half-shell 3 also comprises four shell elements 30, which are connected to each other via connecting webs 31. The shell elements 30 with the connecting webs 31 surround an inner opening 34, around which an inner rim 32 is arranged. Furthermore, an outer rim 33 is provided on the half-shell 3, which, like the inner rim 32, is designed as a flange.

[0017] In the Fig. 2A and Fig. In 2B, the two half-shells 2 and 3 are connected to form a hollow body 1. The individual shell elements 20 and 30 each surround an inner cavity and can optionally be connected to each other via channels on the connecting webs 21 and 31.

[0018] The hemispheres 2 and 3 abut each other at contact surfaces in the area of ​​the inner edge 22 and 32 and the outer edge 23 and 33. As can be seen from the detailed view of the Fig. As can be seen in Figure 2B, a sealing element 25 made of an elastic or sealing material is located at the outer edge 23, and another sealing element 35 made of an elastic or sealing material is located at the outer edge 33. The sealing elements 25 and 35, together with sealing elements at the inner edge 22 and 32, form a sealing plane to prevent liquid from entering the inner cavity of the hollow body 1. The sealing elements 25 and 35 have a height h perpendicular to a sealing plane of between 0.01 mm and 10 mm, in particular 1 mm and 3 mm. The width b of the sealing elements is, for example, in the range of 1 mm to 10 mm, in particular 2 mm and 5 mm. The sealing elements 25 and 35 are made, for example, of EPDM / TPU / TPE or a foamed polyurethane or a similar sealing material.

[0019] The first half-shell 2 is fixed to the second half-shell 3 by means of fasteners 4 in the form of separate pins, each of which is inserted into an opening 26 on the edge 22 and holds the two half-shells 2 and 3 together by clamping or snapping. Optionally, integrally formed retaining elements such as locking tabs, lugs, pins or other locking mechanisms, including, for example, threaded solutions in the case of hemispherical half-shells, can also be used as fasteners (4) to fix the two half-shells 2 or 3 together.

[0020] In Fig. Figure 3 shows four hollow bodies 1 arranged on a lower reinforcement grid 6 and covered by an upper reinforcement grid 5. In this configuration, the hollow bodies 1 can be cast into a concrete slab.

[0021] Fig.Figure 4 shows a concrete ceiling or concrete wall 10 in which the hollow bodies 1 between the upper reinforcement grid 5 and the lower reinforcement grid 6 are cast into a concrete body 7.

[0022] In the illustrated embodiment, the hollow bodies 1 are each square in plan view and have an inner opening through which concrete can flow. It is, of course, also possible to modify the geometry of the hollow bodies 1 and make them round in plan view. Furthermore, the shape of a central opening can be varied, or the central opening in each hollow body 1 can be omitted entirely. Reference symbol list 1 hollow body 2 half-shells 3 half-shells 4 Fasteners 5 Reinforcing mesh 6 Reinforcing mesh 7 concrete structures 10 Concrete ceiling or concrete wall 20 shell elements 21 Connecting bridge 22 Rand 23 Rand 24-hour opening 25 sealing element 26 Opening 30 shell elements 31 Connecting bridge 32 Rand 33 Rand 34 Opening 35 Sealing element h height b width QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 2 516 763 B1

[0002] WO 2005 / 080704 A1

[0002]

Claims

Hollow body (1) for producing a concrete ceiling or concrete wall (10) with a first half-shell (2) and a second half-shell (3) which abut each other with a contact surface and surround at least one closed cavity, wherein the first half-shell (2) is held on the second half-shell (3) by means of fastening means (4), characterized in that at least one sealing element (25, 35) made of a material which has a higher elasticity than the material of the first half-shell (2) and / or the second half-shell (3) is provided on the contact surface. Hollow body according to claim 1, characterized in that the at least one sealing element (25, 35) is fixed to the first half-shell (2) or the second half-shell (3) in a materially bonded manner. Hollow body according to claim 1 or 2, characterized in that a first sealing element (25) is fixed to the first half-shell (2) and a second sealing element (35) is fixed to the second half-shell (3), the sealing elements being abutting each other at the contact surface. Hollow body according to one of the preceding claims, characterized in that the at least one sealing element (25, 35) is formed by a coating on the first half-shell (2) and / or the second half-shell (3). Hollow body according to one of claims 1 to 3, characterized in that the at least one sealing element (25, 35) is manufactured as a separate molded seal which is mechanically or materially fixed to the first half-shell (2) and / or the second half-shell (3). Hollow body according to one of the preceding claims, characterized in that the first half-shell (2) and the second half-shell (3) are of identical construction. Hollow body according to one of the preceding claims, characterized in that the at least one sealing element (25, 35) has a height (h) between 0.01 mm and 10 mm, in particular 1 mm and 3 mm, perpendicular to a sealing plane. Hollow body according to one of the preceding claims, characterized in that the at least one sealing element (25, 35) has a width (b) between 1 mm and 10 mm, in particular 2 mm and 5 mm, perpendicular to a longitudinal direction. Hollow body according to one of the preceding claims, characterized in that the at least one sealing element (25, 35) comprises EPDM, TPU, TPE, an elastomer, silicone or a foamed polyurethane material. Concrete ceiling or concrete wall (10) with at least one hollow body (1) according to one of the preceding claims, which is held between an upper reinforcement grid (5) and a lower reinforcement grid (6).

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