Device and method for producing and sealing a cable feedthrough directly under a ceiling

Abstract

The invention relates to device (1) for producing and sealing a cable feedthrough directly under a ceiling (2), in particular in a drywall panel, comprising: - a feedthrough box (3) to be secured to the ceiling (2), comprising two open end faces (4) lying opposite each other and lateral walls (5) which extend therebetween and which are open towards the ceiling (2) and are to be closed by the ceiling (2) such that when the box (3) is installed on the ceiling (2), the lateral walls (5) together with the ceiling (2) form an axial passage channel (6), which is peripherally closed , for feeding through cables (7); and - one or more support frame elements (8), wherein each support frame element (8) is molded or secured onto the outer face of the lateral walls (5) of the box (3) and extends radially outwards such that the support frame element forms a substantially flat support surface (10) for supporting a wall panel (9), for example a gypsum plaster board, when producing or closing a vertical wall, in particular a drywall panel, around the box (3).

Description

[0001] DESCRIPTION

[0002] Device and method for producing and sealing a cable duct directly under a room ceiling

[0003] The invention relates to a device and a corresponding method for producing and sealing a cable duct, for example, for cables or pipes. The cable duct is intended to extend through a vertical wall to be constructed or sealed, in particular a drywall, and run directly beneath a ceiling, for example, in a building. In particular, this can involve a fire-protection-compliant sealing of the cable duct, specifically against smoke gases and / or heat transfer.

[0004] Fire barriers, i.e. the restoration of the fire resistance of a building element such as a wall or ceiling after its opening and the installation of pipes and electrical lines, are usually created in drywall walls in one of the following two different ways:

[0005] In the first variant, the drywall is already present from the start. The opening is subsequently cut into the wall, for example using a hole saw. Then, for example, a prefabricated fire-resistant cable box, such as those known in various designs for sealing off pipe or cable penetrations through a building wall, is installed. However, the cables can also be installed first, and the opening can then be closed again, for example with fire-resistant plugs made of an intumescent PU foam (polyurethane), or simply with a mineral wool seal. In a second variant, a recess is created in the drywall during the construction of the drywall. This procedure is typically chosen when larger openings need to be created.Here, for example, a large opening is created at the same time as the construction of the wall's stud frame, for example by inserting suitable drywall profiles (also called changes).

[0006] In addition, there are also an increasing number of prefabricated cable boxes available that can be cast into a concrete ceiling, for example. Furthermore, several types of simple fire-rated cable boxes are known that are screwed directly under the ceiling to route cables below the ceiling. The disadvantage of these cable boxes, however, is that despite the use of a prefabricated element, many sometimes complicated steps are still necessary, such as: applying a seal between the ceiling and the cable entry box; attaching a base plate; installing the cables; closing the box; installing the drywall elements (studs + plasterboard); sealing the wall to the cable entry box; and sealing the cables inside the box.

[0007] These and other devices for the fire-protection-compliant production and / or sealing of cable penetrations are also known, for example, from EP 3736928 A1, DE 9310405 U1, US 7193153 B2, WO 06045985 A1, EP 2350512 B1, WO 14160353 A1, WO 12009211 A2, EP 2467914 B1 or WO 16058026 A1.

[0008] It is an object of the present invention to provide an alternative or improved device and a corresponding method for producing and sealing a cable penetration, in particular for fire protection partitioning, with which in particular assembly can be simplified for the user and / or functionality can be improved, for example with regard to the tightness and / or robustness of the device. This object is achieved by a device according to claim 1 and by an associated method for producing and sealing a cable penetration and a cable penetration produced thereby according to the independent claims. Further embodiments are specified in the dependent claims. All features and effects described herein for the device also apply accordingly to the method and the cable penetration, and vice versa.

[0009] The cable penetration can, in particular, concern electrical cables, but also pipes or other types of cables that are to be routed, for example, through a fire compartment. With the device presented below, the cable penetration can be created, for example, in a wall yet to be constructed, especially a drywall wall, but in principle also in a wall opening that is to be sealed. The wall can, for example, be a vertical wall in a building. In particular, this can involve a fire-protection-compliant seal for the cable penetration, especially against smoke gases and / or heat transfer.

[0010] According to a first aspect, a device is provided for producing and sealing a cable duct directly under a room ceiling, in particular a concrete ceiling.

[0011] For this purpose, the device comprises a feed-through box (short: box) to be fastened to the ceiling with two opposite open end faces and side walls extending between them (i.e. in the direction of a longitudinal axis of the box, i.e. axially). The box or its side walls are open towards the ceiling and are closed by the ceiling during installation. When the box is mounted on the ceiling, its side walls together with the ceiling form an axial passageway that is closed in the circumferential direction for the passage of cables. Furthermore, the device comprises one or more support frame elements (also called mounting frames herein) for supporting, aligning and / or fastening one or more wall panels, from which a vertical wall, in particular a drywall, is to be erected, on and around the box.For this purpose, each support frame element is formed on the outside of the side walls of the box or is otherwise fixed or movable and extends radially outwards in such a way that it forms a substantially flat support surface for supporting a wall panel, for example a plasterboard, when creating or closing the wall around the box.

[0012] With such a prefabricated device, the problems and objectives mentioned above can be solved. In particular, the use of this device and the associated method, due to the design and mutual arrangement of the box and the support frame elements described herein, allows for a simplification of many of the necessary steps in the manufacture and sealing of a cable penetration compared to the aforementioned prior art. Furthermore, this device is characterized by the fact that it contains significantly fewer components compared to the aforementioned prior art, while offering comparable or even better functionality and robustness.

[0013] With this device, the cable duct can be installed together with the construction of a drywall. By routing the cables, in particular cables, directly below the ceiling, heat transfer through the cables, for example to the side facing away from the fire in the event of a fire, can be considerably reduced because a (large) portion of this heat can be dissipated directly to the concrete ceiling, for example. In particular, the connection of the cable duct to the drywall can be designed, as described in more detail below, in such a way that any ceiling movement of, for example, + / - 0.5" resulting from static loads is possible without additional measures. The box can in particular be designed as a one-piece, i.e. self-contained, part. For example, it can be manufactured in one piece by molding or other manufacturing processes.

[0014] According to one embodiment, the support frame element or at least one of the plurality of support frame elements is also formed integrally with the box. This can result in a particularly robust and / or easy-to-manufacture device. However, in this embodiment, the support frame element or at least one of the plurality of support frame elements can also be permanently and immovably fixed to the box in another way, for example, molded, welded, screwed, or glued, to achieve a similar functionality.

[0015] Alternatively or additionally, at least one of the plurality of support frame elements on the box can be axially displaceable, for example in the manner of a rail. This allows the position of the wall panel to be varied or adapted in the direction along the box. In this embodiment, the device is flexibly adaptable, in particular to wall thicknesses that deviate from the standard. Optionally, for example, interlocking, complementary axial rail elements can be formed on the outside of the box and on the inside of the support frame element. The displaceable support frame element can, for example, be completely removable from the box or be permanently - but movably - connected to the box, for example by limiting its axial displaceability on the box on both end faces by mechanical stops.

[0016] In terms of its radial cross-section, the box can be U-shaped, for example largely rectangular on the inside and / or outside. Other cross-sectional shapes, in particular rounded geometries, are also possible. A rectangular geometry can not only be particularly simple to manufacture and / or handle, but can also be particularly well-suited, for example, to the positioning and support / alignment of the wall panels on the box and on the support frame elements. It can also be particularly space-saving and advantageous for attaching as many of the cables to be fed through as possible and over as large an area as possible directly to the ceiling, in order to enable the most effective heat transfer from warm cables to the cool ceiling.

[0017] In a specific design, each support frame element completely surrounds the side walls of the box in radial cross-section. In other words, in this design, each support frame element forms a continuous support surface around the box (when mounted to the ceiling) for supporting a wall panel during the construction or sealing of the wall. This can simplify and improve both the construction of the wall and the sealing of the cable entry to the wall.

[0018] According to one embodiment, the device further comprises at least one elastically deformable sealing closure element, which is designed and dimensioned for insertion into the passage channel (repeated several times if necessary, with removal in between) on at least one of the end faces of the box and for tightly closing the passage channel, whether before or after the cables are laid. For this purpose, the elastically compressible closure element can, for example, be made at least partially from an elastically deformable foam and have a cross-section that is approximately the same as or slightly larger than the inner radial cross-section of the box in order to tightly close the box together with the cables laid therein. The closure element can, in particular, serve to create an airtight seal between the feed-through box and the cables. It can, for example, be made from canned foam or flexible foam.

[0019] The device, in particular the box and / or the support frame elements, can be made, for example, of a highly cross-linked rigid foam, in particular polyurethane (PU). This PU foam can be filled, in a conventional manner, with typical fire protection additives, such as expandable graphite, ammonium polyphosphate, and the like, particularly for fire protection applications.

[0020] The box and / or its support frame elements can also be made of metal and / or other organic or inorganic materials with application-specific desired properties with regard to porosity, weight, and / or strength, among other things (for example, as described below). For example, gypsum or other cement-based materials are suitable for this purpose. However, it is also possible for such a shell, i.e., the device or its box, to be made of a ceramic material, for example, clay. Curing can then be achieved, for example, by a firing process.

[0021] A device whose box and support frame elements are made of non-intumescent (i.e., non-expanding under heat) materials can be used directly for penetrations designed, for example, solely to seal against sound and air or other gases and odors, and which do not require fire resistance. No special material class is mandatory for sealing the pipe in such applications.

[0022] However, if such a device (especially one made of inorganic materials) is used for fire protection penetrations, care must be taken when sealing the pipes to ensure that the desired fire resistance duration can be achieved. For pipe sealing with fire protection functions, intumescent (i.e., foams that expand under the influence of heat) or mineral wool can be used, for example, in combination with a fire protection sealant of a known type.

[0023] When using an intumescent base material for the box, the opening in the center (i.e., the passageway) can be closed in the event of a fire by the heat-induced expansion of the base material. The remaining sealing, such as at least one of the closure elements described above, can then largely serve to seal off smoke gases, so that even a normally flammable foam material is sufficient for this purpose.

[0024] With regard to further material properties for the base material of the box, a material with a low pore content and thus a material volume density of, for example, between 0.3 and 1, or up to 2.7 for inorganic materials, is particularly preferred. In a highly cross-linked polyurethane (PU), this is achieved, for example, by slightly foaming the material. With inorganic materials, the use of hollow spheres is one option for creating pores of a desired size. Of course, this desired porosity can also be achieved by incorporating air or gas during production.

[0025] This porosity can be particularly helpful when attaching the box or support frame elements to the ceiling and / or a drywall profile using screws. Alternatively, screw fastening would require pre-drilled holes in the box or support frame elements, which is not necessary when using a suitable porous base material.

[0026] According to one embodiment, the box and / or each support frame element, apart from any linings (e.g., fire protection and / or other protective layers), is therefore made of a porous base material. In this embodiment, the porous base material can be, in particular, an inorganic material with a volume density of at most about 3, in particular between about 0.3 and about 2.7, or an organic material with a volume density of at most about 2, in particular between about 0.3 and about 1. The aforementioned porosity of the base material or the aforementioned volume density can be created, in particular, by hollow spheres evenly distributed in the material. As already mentioned, the device can, in particular, meet predetermined fire protection requirements. For this purpose, for example, at least one of its components can comprise or consist of fire protection additives, intumescent and / or fire-resistant materials.Alternatively or additionally, at least one specially designed intumescent element can be arranged and configured in the passage channel and / or on at least one support frame element to seal the passage channel and / or the cable penetration against the wall in the event of a fire to prevent fire from spreading. This can be implemented, for example, in the form of at least partial internal and / or external lining of the side walls of the box and / or the support frame elements with intumescent strips or bands.

[0027] With regard to fire protection, various variants are possible for the material selection of the at least one elastically deformable closure element mentioned here, depending on the sealing effect to be achieved and the materials used in the box. For example, if the box is made of an intumescent material, the required fire resistance can be largely achieved through this effect. The choice of material for the closure element is then diverse. If, on the other hand, the box is made solely from inorganic materials, the required fire resistance period can be achieved by selecting the sealing material of the closure element. Suitable materials for this could include, for example, an intumescent foam or mineral wool with a fire-resistant coating.

[0028] For the arrangement of the closure elements in the passage duct, an installation depth of approximately 10-50 mm for one closure element on each end of the box (i.e. sealing the passage duct on both sides) has proven particularly suitable, particularly with regard to fire protection. As far as the choice of material for the support frame elements (also referred to herein as mounting frames) is concerned, such a frame can be manufactured most cost-effectively from metal. However, metal itself has only very poor insulating properties. In this case, the necessary insulating effect can be ensured, for example, by a thin intumescent strip that is glued to the mounting frame. In the event of a fire, a gap between the box and the respective wall panel (plasterboard) can be completely closed by this intumescent layer.For the insulating effect of such an intumescent layer, it can be ensured, for example, that the required maximum temperature on the side facing away from the fire, for example a maximum of +180°C, can also be maintained in this area of ​​the room.

[0029] For a removable or movable support frame element, it is also possible to use a (particularly U-shaped) sheet metal frame coated with an intumescent material only on the inside, i.e., facing the box, and / or on its support surface. Alternatively, a U-shaped sheet metal frame without a coating and only with an intumescent foam piece for the room-side closure to the box and / or the respective wall panel is also possible.

[0030] In particular, the device can further comprise at least one wall-creating ceiling profile element (herein also referred to as drywall profile, ceiling profile, drywall ceiling profile, or metal profile of the (drywall) stud frame), which is designed for installation under the ceiling and for fastening to the respective support frame element to expand its support surface for a wall panel, for example a plasterboard, when creating or closing the vertical wall around the box. Such a wall-creating ceiling profile element can in particular be made of metal. It can, for example, be designed to fit precisely onto one or more support frame elements of the device. On the other hand, the device described herein can be provided without such ceiling profile elements and used with standard ceiling profile elements, for which the support frame elements of the device are in turn designed and dimensioned to suit.

[0031] According to a further aspect, a method for producing and sealing a cable penetration directly beneath a room ceiling using the device presented herein is provided. The method may, in particular, comprise the following steps:

[0032] The penetration box is attached to the ceiling so that the side walls of the box, together with the ceiling, form a circumferentially closed axial passageway for passing cables through a vertical wall to be erected below the ceiling. If necessary, this can be followed by aligning and attaching at least one of the aforementioned wall-forming ceiling profile elements to the one or more support frame elements to expand the support surface formed by the respective support frame element for supporting a wall panel in the direction along the ceiling.

[0033] Before, after, or at any time subsequently, one or more cables can be installed in the passageway formed by the box. The cables can be secured to the ceiling in such a way that they have the greatest possible contact with the ceiling. This can particularly help dissipate heat from the cables to the ceiling, thus cooling the cables in the event of a fire.

[0034] If the device comprises one or more of the closure elements mentioned herein, the passage channel formed by the box, including any cables laid therein, can be sealed from at least one end face with a respective closure element. For this purpose, the closure element, which is specially designed and dimensioned for this purpose, is simply inserted into the passage channel, for example, as described in more detail above. A vertical wall can be created around the box, before or after, by placing and aligning at least one wall panel, in particular a plasterboard, with its wall panel surface directly on the support surface of the respective support frame element and, if appropriate, also on the at least one wall-creating ceiling profile element attached to it.The steps of laying the pipes and sealing the passageway with closure elements can in principle be carried out before or after any other step of the process in any order and in particular also after the creation of the wall or can be repeated several times subsequently.

[0035] According to one embodiment, during the construction of the wall, the respective wall panel is placed and aligned on the associated support frame element such that a predetermined, in particular vertical, distance remains between the box and an edge of the wall panel facing the box, which distance is measured along the support frame element. This allows for appropriate mobility of the box relative to the wall panel, for example, in the case of static loads on the ceiling, without the need for any additional measures. As mentioned above, the mobility can be, for example, + / - 0.5".

[0036] According to a further aspect, a cable entry is provided that is manufactured directly beneath a room ceiling in an adjoining vertical wall using a method presented herein. As mentioned, a predetermined, particularly vertical, distance, measured along the support frame element, can remain between the box and the edge of the respective wall panel facing the box, allowing a freedom of movement of the wall panel of, for example, approximately + / - 0.5".

[0037] The above aspects, embodiments, and specific configurations of the invention are explained in more detail below with reference to the exemplary embodiments illustrated in the drawings. The drawings are schematic. They may, but do not have to, be to scale. They show:

[0038] Figure 1 is a perspective view of a device according to an embodiment of the invention for producing and sealing a cable feedthrough, with two support frame elements formed in one piece with a feedthrough box;

[0039] Figure 2 shows, in the same perspective view, the device of Figure 1 with a wall-generating ceiling profile element attached to the support frame elements;

[0040] Figure 3 is a further perspective view of the device of Figure 2 in its ceiling-mounted state and with cables laid;

[0041] Figure 4 shows an enlarged section of Figure 3 with a view of the fastening of the ceiling profile element to the support frame elements;

[0042] Figure 5 is a further perspective view of the device of Figure 3 with a passage channel sealed by a closure element;

[0043] Figure 6 shows a radial cross-section of a device according to an embodiment of the invention with an intumescent material layer as the inner lining of the box; and

[0044] Figure ? a perspective view of a cable bushing which was manufactured and sealed using a method according to an embodiment of the invention.

[0045] All of the various embodiments, variants, and specific design features of the device for producing and sealing a cable feedthrough, the associated method, and the cable feedthrough produced thereby according to the above aspects of the invention mentioned above in the description and in the subsequent claims can be implemented in the examples shown in Figures 1 to 7. They will therefore not all be repeated again below. The same applies accordingly to the definitions of terms and effects already given above with regard to individual features shown in Figures 1-7. To avoid repetition, reference is made to the more detailed description of the invention above and in the claims.

[0046] Figure 1 shows a perspective view of a device 1 according to an embodiment of the invention for producing and sealing a cable duct directly under a room ceiling 2 (cf. Fig. 3-7) in a wall to be constructed later (cf. Fig. 7), in this example a drywall.

[0047] For this purpose, the device 1 comprises a feedthrough box 3 (box 3) to be fastened to the ceiling 2, having two opposing open end faces 4 and side walls 5 extending therebetween in the direction of the box's longitudinal axis A. The box 3 is open toward the ceiling 2 and is closed by the ceiling 2 during installation. When the box 3 is mounted on the ceiling 2 (see Fig. 3-7), its side walls 5, together with the ceiling 2, form a circumferentially closed axial passage 6 for the passage of cables 7.

[0048] Furthermore, the device 1 in this example comprises two support frame elements 8 (also called mounting frames herein) for supporting, aligning and / or fastening one or more wall panels 9 (in this example, plasterboard, see Fig. 7), from which the drywall is to be constructed, to the box 3 and around the box 3. For this purpose, in this example, each support frame element 8 is formed on the outside of the side walls 5 of the box 3 and extends radially outwards such that it forms a substantially flat support surface 10 for supporting the wall panel 9 around the box 3.

[0049] In this example, both support frame elements 8 are formed as one piece and are thus immovable with the feedthrough box 3. Alternatively or additionally, a support frame element 8 can be axially displaceable on the box 3 (not shown) in order to be able to vary or adjust the position of the wall plate 9 in the direction along the box 3.

[0050] In this example, both the box 3 and both support frame elements 8 are U-shaped in radial cross-section and, purely by way of example, rectangular on the inside and / or outside. The base material for their manufacture can be, for example, porous material of the type described in detail above.

[0051] Figure 2 shows, in the same perspective view as Fig. 1, the device 1 with a wall-forming ceiling profile element 11 (also referred to herein as a drywall profile, ceiling profile, drywall ceiling profile, or metal profile of the (drywall) stud frame) attached to the support frame elements 8. In this example, the ceiling profile element 11 is a strip-shaped metal element that can be precisely fitted onto the two support frame elements 8, thereby aligning and pre-fixing them. It can then be attached to the support frame elements 8, for example, using drywall screws 12 (see Fig. 4).

[0052] Fig. 3 shows a further perspective view of the device 1 of Fig. 2 in its mounted state on the ceiling 2 and with laid lines 7, in this example some cables. Fig. 4 shows an enlarged section of Fig. 3 with a view of the fastening of the ceiling profile element 11 to the support frame elements 8 by screws 12. The arrangement of the lines 7 (here cables) shown in the figures without any gap, i.e. directly beneath the ceiling 2, has proven very advantageous in a representative fire test that the lines 7 can dissipate heat on the side facing away from the fire directly into the "cold" concrete ceiling 2.

[0053] Fig. 5 shows a further perspective view of the device 1 of Fig. 3, wherein its passage channel 6 has been sealed (i.e., tightly closed) with an elastically deformable closure element 14. In this example, the closure element 14 is a foam element dimensioned to seal the passage channel and is elastically compressible. As illustrated in Fig. 5, the closure element 14's elasticity allows for easy conformation to the lines 7 in order to adequately seal the box 3 when the number of lines 7 varies (and in particular, even when the number of lines 7 is zero).

[0054] Fig. 6 shows a radial cross-section of a device 1 according to an embodiment of the invention, which may in particular be the device of Figs. 1-5. In this example, the box 3 is sealed by a closure element 14 and additionally lined on the inside with an intumescent material layer / layer 15, so that the intumescent layer 15 can additionally seal the cable duct in the event of a fire by expanding into the passage duct 6. This variant can be used, for example, if the box 3 itself is manufactured from inorganic materials. Otherwise, as mentioned above, the base material of the box 3 and / or the support frame elements 8 can also contain or consist of intumescent material, so that no additional lining or coating is necessary to meet fire protection requirements.

[0055] Fig. 7 shows a perspective view of a finished cable duct that was manufactured and sealed using a method according to an embodiment of the invention. The cable duct shown was manufactured using a device 1 according to Figs. 1-6 as described further above and in the claims. The above-mentioned mounting plates 9 (for example plasterboard) lie flat on the mounting frame (i.e. on the support surfaces 10 of the support frame elements 8, which are hidden in Fig. 7), so that a sliding connection is created. Furthermore, in this example, the mounting plates 9 are installed at a predetermined vertical distance D from the box 3 so that when the ceiling 2 is subjected to a static load, it can bend unhindered. This can enable, for example, a mobility of + / - 0.5" without additional measures.As already mentioned, the device and method presented here for producing and sealing a cable duct can, in particular, enable rapid installation, whereby no additional sealants are required. The installation of the duct and, if necessary, also the cables, is possible at a very early stage of the wall's construction. The installation of the cables and the duct is also possible in an unfinished wall. A sliding connection of the device to the plasterboard wall enables movement without additional measures between the ceiling and the drywall. The cable duct can be produced cost-effectively, while meeting all necessary leak-tightness and, if necessary, fire protection requirements. The fire protection function can already be integrated into the U-shaped duct box. The airtight seal can also be achieved using standard materials, such as construction foam.Alternatively or additionally, the fire protection function can also be shifted to the sealing closure elements. The box 3 and / or its support frame elements 8 can, in particular, be designed to be thermally resistant to temperatures exceeding 1000°C.

Claims

PATENT CLAIMS 1. Device (1) for producing and sealing a cable duct directly under a room ceiling (2), in particular in a drywall, comprising: - a lead-through box (3) to be fastened to the ceiling (2) with two opposite open end faces (4) and side walls (5) extending therebetween, which are open towards the ceiling (2) and can be closed by the ceiling (2), so that the side walls (5) form, together with the ceiling (2), an axial passage channel (6) closed in the circumferential direction for the passage of cables (7) when the box (3) is mounted on the ceiling (2); and - one or more support frame elements (8), each support frame element (8) being formed or fastened to the outside of the side walls (5) of the box (3) and extending radially outwards such that it forms a substantially flat support surface (10) for supporting a wall panel (9), for example a plasterboard panel, when creating or closing a vertical wall, in particular a drywall, around the box (3).

2. Device (1 ) according to claim 1, wherein - the box (3) is made in one piece.

3. Device (1) according to claim 1 or 2, wherein - the support frame element (8) or at least one of the plurality of support frame elements (8) is formed integrally, in particular in one piece, with the box (3) or is otherwise permanently and immovably fixed to it.

4. Device (1) according to claim 1 or 2, wherein - the support frame element (8) or at least one of the plurality of support frame elements (8) is axially displaceable on the box.

5. Device (1) according to one of the preceding claims, wherein - the box (3) has a U-shaped, in particular inside and / or outside substantially rectangular, radial cross-section.

6. Device (1) according to one of the preceding claims, wherein - each support frame element (8) completely surrounds the side walls (5) of the box (3) in radial cross-section.

7. Device (1) according to one of the preceding claims, further comprising: at least one elastically deformable sealing closure element (14) which is designed and dimensioned for repeated insertion into the passage channel (6) on at least one of the end faces (4) of the box (3), optionally after the laying of the lines (7), and for tightly closing the passage channel (6), optionally with the lines (7) laid therein.

8. Device (1) according to one of the preceding claims, wherein - the box (3) and / or each support frame element (8) is made of a porous base material apart from any linings.

9. Device (1 ) according to claim 8, wherein the porous base material - an inorganic material having a volume density of at most about 3, preferably between about 0.3 and about 2.7; or - is an organic material having a volume density of at most about 2, preferably between about 0.3 and about 1.

10. Device (1 ) according to claim 8 or 9, wherein - the porosity of the base material and preferably also the said volume density is produced by hollow spheres that are substantially uniformly distributed in the material.

11. Device (1) according to one of the preceding claims, which meets predetermined fire protection requirements in that at least one of its components comprises or consists of fire protection additives, intumescent and / or fire-resistant materials; and / or - at least one intumescent element is arranged in the passage channel (6) and / or on at least one of the support frame elements (8) and is designed to seal the passage channel (6) and / or the wall opening against the spread of fire in the event of a fire.

12. Device (1) according to one of the preceding claims, further comprising: - at least one wall-creating ceiling profile element (11) which is designed, in particular made of metal, to be mounted under the ceiling (2) and to be fastened to the respective support frame element (8) in order to extend its support surface (10) for a wall panel (9), for example a plasterboard, when creating or closing the vertical wall around the box (3).

13. A method for producing and sealing a cable duct directly under a room ceiling (2) using a device (1) according to one of the preceding claims, comprising the steps: - fixing the feed-through box (3) to the ceiling (2) so that the side walls (5) of the box (3) together with the ceiling (2) form a circumferentially closed axial passage channel (6) for passing cables (7) through a vertical wall to be erected under the ceiling (2); - if necessary, aligning and attaching at least one wall-creating ceiling profile element (11) to the one or more Support frame elements (8) to expand the support surface (10) formed by the respective support frame element (8) for supporting a wall panel (9); - if necessary, laying one or more lines (7) in the passage channel (6) and preferably fixing the one or more lines (7) to the ceiling (2) in such a way that the line(s) (7) has / have the greatest possible contact with the ceiling (2); - if necessary, sealing the passage channel (6), together with any lines (7) laid therein, from at least one end face (4) with a respective closure element (14); - Creating a vertical wall, in particular a drywall, around the box (3) by placing and aligning at least one wall panel (9), in particular a plasterboard panel, with its wall panel surface directly on the support surface (10) of the respective support frame element (8) and optionally also on the at least one wall-creating ceiling profile element (11) attached thereto.

14. The method according to claim 13, wherein - when creating the wall, the respective wall panel (9) is placed and aligned on the associated support frame element (8) in such a way that a predetermined, in particular vertical, distance (D), which is measured along the support frame element (8), remains between the box (3) and an edge of the wall panel (9) facing the box (3).

15. Cable duct, which was produced directly under a room ceiling (2) in an adjoining vertical wall, in particular a drywall, by a method according to claim 13 or 14, wherein - between the box (3) and the edge of the respective wall panel (9) of the wall facing the box (3), preferably a predetermined, in particular vertical, distance (D), which is measured along the support frame element (8), remains, which allows a freedom of movement of the wall panel (9) relative to the ceiling (2) of, for example, approximately + / - 0.5".

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