Use of a feedthrough for pouring into a base plate

Abstract

Use of a feedthrough (1) for casting into a base plate (30) and passing a conduit (53) through it, which carrying out (1) has a casing tube (2) and a base body (3) which is arranged at an upper end of the casing tube (2), wherein the base body (3) has a bottom part (3.1) and a side wall (3.2) and thus forms a cavity (8) at the upper end of the casing tube (2), wherein the passage (1) further comprises a cover element (7) which covers the cavity (8) formed by the base body (3) when pouring it into the base plate (30), wherein the outer tube (2) and the base body (3) are cast into the base plate (30), the base body (3) being cast flush with the top edge (23) of the base plate (30), wherein the cover element (7) is also cast flush into the base plate (30), namely, the top of the cover element (7) is flush with the top edge (23) of the base plate (30) after being cast into the base plate (30), and wherein, after the pouring of the base slab (30), a floor structure (31) is built on it, wherein a cavity (32) is kept free at the upper end of the casing pipe (2), and wherein, after the pouring of the base slab (30), the line (53) is laid through the casing pipe (2), wherein a pipe stub (52) of a mounting attachment (50) extends the casing pipe (2) upwards.

Description

[0001] The present invention relates to the use of a feedthrough for casting into a base plate and passing a conduit through it.

[0002] The penetration in question can be used as a building entry point to route the pipe through the foundation slab and into the building in the case of a building without a basement. The penetration is first positioned on the construction site and aligned, for example, using a string line. When the foundation slab is poured, it is cast into the slab, thus maintaining a clear passage for the pipe(s).

[0003] DE 10 2005 041 176 A1 relates to a floor penetration with a box constructed from stacked frame parts, which is cast into a base plate with an overhang.

[0004] DE 299 22 263 U1 discloses a recess body for precast concrete slabs which are thickened on site with a layer of cast-in-place concrete.

[0005] DE 71 05 105 U relates to a flush-mounted box, and DE 2 402 022 A describes a lip seal for connecting pipes.

[0006] The present invention is based on the technical problem of specifying a particularly advantageous implementation as the subject of such use.

[0007] This is achieved according to the invention with the features of claim 1. The feedthrough comprises a casing tube and a base body, which is arranged at the upper end of the casing tube. The base body, with a bottom section and a side wall, defines a cavity at the upper end of the casing tube. This assembly is then cast into the base plate in such a way that the side wall of the base body projects no more than 5 cm beyond the upper edge of the base plate, i.e., it lies flush with the upper edge.

[0008] Next, a floor structure is built on the foundation slab, typically a screed layer poured on top, often in conjunction with an insulation layer underneath (between the foundation slab and the screed) and / or a floor covering on top. When pouring the foundation slab, the height of the floor structure to be built on top is usually not yet known, so it is not simply possible to position the casing pipe at such a height during the pouring of the foundation slab that its upper end will be level with the finished floor structure. One approach is to provide the casing pipe, or a box positioned above it (which maintains a cavity at the end of the casing pipe), with such an excess that there will always be a protrusion above the finished floor level. This protrusion must then be trimmed or supported, which means extra work for the installer; however, failing to trim it can pose a safety risk (see below).

[0009] Against this background, the present approach is to cast the base body, which keeps the cavity above the casing pipe clear and thus accessible, into the floor slab without any overhang. The base body then does not protrude from the floor structure, so no shortening is necessary. During the construction of the floor structure, particularly when pouring the screed, the cavity above the casing pipe is kept clear separately, for example, with an integrated or attached formwork element (see below for details regarding various options). A pipe can then be laid through the casing pipe and into the floor slab. For this purpose, a mounting attachment with a pipe socket is attached to the casing pipe. This pipe socket extends the casing pipe upwards, specifically towards the top edge of the floor structure.Preferably, the mounting attachment has a flange plate from which the pipe stub extends downwards, see below for details.

[0010] Since the base unit (even without shortening) does not protrude from the floor structure, the mounting bracket can be positioned relatively close to or flush with the top edge of the floor structure. In the event of a fire at a building entry point, this can delay or prevent the passage of a fire to, for example, the gas line. With a mounting bracket positioned flush with the floor structure, the underlying casing pipe can be partially shielded from the building interior. In contrast, if a box protruding from the floor structure, which would require shortening (see above), were not properly shortened by an installer, the protruding side wall would quickly melt in the event of a fire, thus creating a "channel" to the gas line (e.g., in the case of plastic material, which would be advantageous due to the need for shortening).

[0011] Preferably, the base body has a comparatively low overall height, e.g., no more than 10 cm, 8 cm, 6 cm, 5 cm, or 4 cm, with possible (independent) lower limits of, for example, at least 1 cm or 2 cm. The height of the side wall is therefore preferably within a corresponding range.

[0012] Preferred embodiments are found in the dependent claims and the entire disclosure, whereby the description of the features does not always differentiate in detail between process, use, or device aspects; in any case, the disclosure is to be read implicitly with regard to all claim categories. For example, insofar as a use of the embodiment is described, this is always to be read as a disclosure of an embodiment designed for such use.

[0013] The advantages described can already be realized when only a single line passes through the penetration. This line could, for example, be a gas line. However, the described problem of "breakthrough" can also occur with other types of lines (e.g., electrical or data). For instance, due to a malfunction or damage, gas could leak into the outer casing of this line on the building's exterior side. Preferably, the penetration is designed to accommodate multiple lines, for which it ideally has several casings (see below for details). These can then be used for the individual lines (water, gas, electrical, data, etc.). Here, the described protective function can be particularly effective.

[0014] The mounting bracket preferably has a flange plate, i.e., an outwardly projecting flange, and particularly preferably a fully circumferential flange which, in the mounting position, has a lateral overlap with the surface of the floor structure (a vertical projection of the flange lies at least partially within the surface of the floor structure); preferably, the flange rests on the surface of the floor structure. The flange plate is preferably made of plastic, in particular fiber-reinforced plastic, such as glass fiber-reinforced polyamide. The mounting bracket can also serve as a pull-out restraint, i.e., hold the pipe axially in position (against a downward force or a force directed towards the outside of the building) if the pipe is subjected to tensile stress, for example, during subsequent excavation work with an excavator bucket (the excavator engages the pipe).

[0015] The flange plate preferably includes a through-opening through which the installed pipe extends into the building interior. The through-opening is flush with the pipe stub at the bottom. The pipe is then preferably sealed against the mounting bracket with a sealing element, for example, made of an elastomeric material. Ideally, this prevents any fluidic connection between the inside of the casing pipe and the building interior, thus preventing, for example, gas or leakage gas from entering the building. Generally, the casing pipe serves as an enclosure or conduit for the actual pipe, which is usually laid only after the foundation slab has been poured or the floor structure has been completed. The casing pipe forms, or is part of, a protective conduit system that extends from the building to, for example, a connection point (supply line) on the street side.

[0016] This protective conduit system is then laid, at least partially, and preferably entirely (up to the connection point), before the foundation slab is poured. By the time the slab is poured, the trench can ideally already be backfilled (including the area between the building and the connection point). The actual utility line, such as a pipe (gas, water, or district heating) or a cable (electricity or data), can then be installed subsequently, namely by being pushed through the protective conduit system from inside the building or from the connection point. The aforementioned seal between the pipe and the mounting fitting can then be installed.

[0017] The terms "top" and "bottom" refer to the vertical direction, i.e., the position in which the bushing is mounted. Terms such as "side" or "inside" and "outside" refer, unless explicitly stated otherwise, to directions perpendicular to and pointing away from the vertical axis of the bushing (these are horizontal). The side wall preferably extends completely around the entire cavity, thus enclosing it on all sides. Viewed vertically, it can be round, particularly circular, or angular (including with rounded corners). The outer casing tubes can be arranged horizontally in the vertical direction (e.g., at the corners of a square) or preferably in a row next to each other.

[0018] As an alternative to the present design, reference was initially made to a box protruding from the floor structure, which is subsequently shortened (which entails assembly work on the construction site). If such a box is constructed from several stacked box sections to simplify the shortening process, this results in increased manufacturing effort (a greater number of individual parts must be handled and assembled). In contrast, the present approach can therefore also represent a simplification.

[0019] The foundation slab is generally poured on the ground, typically on a layer of fill, especially a leveling layer. It is usually made of concrete and functionally forms the building's foundation. The floor structure is then built on top of this, for example, the screed is poured (possibly on an insulating layer as part of the floor structure), and a floor covering can then be applied.

[0020] According to the invention, the base body is cast flush with the top edge of the base plate. This can, for example, simplify the screeding or smoothing of the grout material, usually concrete. In this variant as well, the side wall can be used to attach a formwork element when constructing the floor; for example, a strip can be glued to the inner wall surface. Additionally or alternatively, a shaped element can be inserted into the base body that protrudes from the top edge of the base plate. The side wall can define the position of such a shaped element and prevent it from slipping.

[0021] The mounting attachment, whose pipe socket is attached to the outer casing pipe when the penetration is fully installed in the floor structure, can also be cast in place together with the base body. The pipe socket would then be inserted into the outer casing pipe, preferably to such an extent that a flange plate of the mounting attachment is positioned within the cavity of the base body, preferably completely enclosed within it. The latter can be advantageous because the base body, including the flange plate, can then be cast flush with the floor slab. After casting into the floor slab, before the floor structure is constructed, the mounting attachment is then extended upwards a short distance (regardless of whether it was previously installed flush with the floor or not). At this point, the height of the floor structure is usually known, and the mounting attachment can be adjusted to this height. Thus, for example, the underside of the flange plate can be positioned at this height or even slightly above it (e.g.,(by a maximum of 10 cm, 5 cm, 4 cm, 3 cm, 2 cm or 1 cm), in order to be moved downwards into the system after completion of the floor construction.

[0022] In an alternative preferred embodiment, the base body and the outer casing are cast into the base plate without the mounting attachment; the mounting attachment is then added subsequently. The base body and the outer casing form, or are part of, a structural component that is integrated during the casting of the base plate. The mounting attachment is then added only after the casting material of the base plate has hardened. The mounting attachment can be attached before the floor structure is built (i.e., the pipe stub can be inserted into the outer casing). A flange plate can be positioned at or above the level of the top edge of the finished floor structure; see also the notes and centimeter measurements in the preceding paragraph.In this procedure, the cavity above the casing pipe is kept clear of the pipe stub of the mounting attachment during the construction of the floor structure.

[0023] The mounting attachment can also be installed after the finished floor has been completed. For this purpose, the cavity above the casing pipe is kept clear, for example, by a formwork element mentioned above or a cover element discussed below. Generally, the pipe socket (of the mounting attachment) can also be pushed onto the casing pipe during the "installation" process; preferably, this "installation" is understood as an insertion (the inserted pipe socket can advantageously extend downwards beyond the base body of the casing pipe).

[0024] According to the invention, a cover element of the feedthrough covers the cavity formed by the base body from above when the base body is cast into the base plate. If the mounting attachment is also cast in, its flange plate can form this cover element.

[0025] According to the invention, the cover element is cast flush into the base plate, so that the upper surface of the cover element is flush with the upper edge of the base plate. Reference is made to the advantages mentioned above regarding the flush installation of the base body. In principle, the cover element can also be formed integrally with the base body; it could then, for example, be knocked out after casting, perhaps with a hammer. This could be facilitated by a predetermined breaking point.

[0026] In a preferred embodiment, however, the cover element is a multi-part cover element in relation to the base body (the base body and cover element are two separate parts). The cover element is then removed from the base body after the base plate has been cast, or sometimes only after the floor structure has been completed. Generally, the cover element can also be, for example, a lid placed on the base body.

[0027] In a preferred embodiment, the cover element is a shaped body arranged in the cavity of the base body. The cover element can fill the cavity to at least 50%, 60%, or 70%, for example; in any case, in an upper section, it preferably borders the side wall of the base body (its inner surface) all the way around. As mentioned, the cover element can also be the flange plate of the mounting attachment; however, a separate cover element may also be preferred (which is then completely removed from the feedthrough and thus does not remain on the fully assembled assembly).

[0028] A preferred embodiment features a separate cover element, according to which the cover element, arranged in the cavity of the base body, projects upwards beyond its side wall. The projecting section can then be used as formwork during the construction of the floor structure, thus keeping the cavity above the casing pipe free of, for example, the screed. After the floor structure is completed, the cover element is removed, and the mounting attachment can be installed.

[0029] The cover element arranged within the hollow body is preferably made of a foamed plastic material, e.g., expanded polystyrene or polypropylene. Extruded polypropylene may be of particular interest. These options apply to both flush installation with the top edge of the base plate and installation with an overhang. In particular, two cover elements can also be provided, with one of lesser height being cast flush into the base plate and then subsequently replaced by a taller cover element for the construction of the floor assembly.

[0030] In a preferred embodiment, the cover element located in the cavity sits on the upper end of the casing pipe. The cover element and the casing pipe are sealed against each other by a gasket. This can, for example, prevent the ingress of contaminants into the casing pipe during the construction phase (e.g., via rainwater that washes in contaminants from the surface of the floor element or floor structure) or also provide protection against seepage gases during the construction phase. The gasket is preferably located between an upper end face of the casing pipe and the cover element. It is preferably made of an elastomeric material.

[0031] The term "elastomer material" is generally a plastic with elastic properties. Its Shore hardness (Shore A) can be, for example, a maximum of 90 Shore, 80 Shore, 75 Shore, or 70 Shore, and (independently of this) a minimum of, for example, 20 Shore, 25 Shore, 30 Shore, 35 Shore, or 40 Shore. It can be, for example, a rubber material, preferably a synthetic rubber such as EPDM (ethylene propylene diene monomer, M group). However, it can also be, for example, a thermoplastic elastomer (TPE) or a silicone-based material, such as silicone rubber or silicone elastomer.

[0032] In principle, it is also conceivable that the seal is attached to or molded onto the cover part, and is therefore removed together with the cover part.

[0033] In a preferred embodiment, the seal remains on the outer casing pipe when the cover is removed from the base body. This variant applies to the subsequently attached mounting attachment, which is therefore only fitted to the penetration after the base slab has been poured and, if applicable, the floor structure has been installed. The seal, which previously sealed the cover and the outer casing pipe against each other, then seals the latter against the pipe socket of the mounting attachment. The same seal can thus advantageously be used twice.

[0034] In a preferred embodiment, the seal has a sealing lip that protrudes outwards (when the pipe fitting is pushed on) or, preferably, inwards (when the pipe fitting is inserted). In axial section, the sealing lip thus has a radial extent relative to the outer casing or the pipe fitting. When the pipe fitting is attached, i.e., when it is pushed on or, preferably, inserted, the sealing lip is folded downwards. In this folded state, the sealing lip lies between the pipe fitting and the outer casing, preferably between an outer wall surface of the pipe fitting and an inner wall surface of the outer casing (in the case of the preferably inserted pipe fitting). When the sealing lip is positioned between the outer casing and the pipe fitting, movement or deformation back to its original state is blocked by the pipes, so that the sealing lip, for example,Even in the event of a pressure event (overpressure) in the pipe system, it reliably remains in the inverted position between the pipes. The sealing lip is less likely to be forced out, for example, compared to a sealing ring (O-ring) positioned between the pipes. When the pipe fitting is attached, the free end of the sealing lip is pulled along by the end of the pipe fitting, after which a certain degree of self-locking occurs.

[0035] In a preferred embodiment, the seal has a sealing lip that, in the unloaded state, extends obliquely upwards towards its free end. Generally, the "unloaded state" refers to a situation in which the seal is positioned on the outer tube, but neither the pipe stub nor the cover is attached. The oblique upward extension of the sealing lip can be advantageous, for example, because it then reliably seals against the cover, which in turn presses the sealing lip downwards a short distance.

[0036] Preferably, this is the same sealing lip that is then also inserted between the outer casing and the pipe stub. The upward slant can also be advantageous with regard to the subsequent seal between the pipes, namely to further increase the "self-locking" effect described above when the lip is inverted downwards.

[0037] The term "oblique" can refer, for example, to an angle of at least 30°, 45°, 60°, or 70°, and (independently of these) not more than 85° or 80° (in each case, the smaller of two angles formed by the sealing lip with the pipe axis is considered). In other words, the sealing lip is not deflected too far from a perpendicular orientation to the pipe axis, for example, by no more than 40°, 30°, or 20° (with possible lower limits of at least 5° or 10°).

[0038] In general, the seal that remains on the outer casing (regardless of whether it has a sealing lip or not) can be molded onto the casing or assembled with it as a separately manufactured part. Molding can be done, for example, using a two-component injection molding process. If the two parts are assembled as previously manufactured separate components, the seal can preferably be held axially in a form-fit connection to the outer casing, for example, by having a section of the seal sit in a groove on the outer casing, preferably a groove in the outer wall surface of the outer casing.

[0039] In a preferred embodiment, a flange is provided on the base body of the penetration, which, after being cast into the base plate, lies flush with its upper edge. Before casting, the flange can thus be used, for example, to adjust the penetration to the correct height. The flange can protrude outwards from the base body by at least 2 cm, preferably at least 3 cm or 4 cm (possible upper limits could be, for example, a maximum of 30 cm, 20 cm, or 15 cm). Before the floor structure is built, a surface seal is preferably machined onto the flange, i.e., a surface seal on the base plate. This is preferably a vapor barrier, which, for example, is laid on the base plate in the form of a foil. This foil can then be attached to the flange, preferably by bonding.

[0040] A flange on the feedthrough, which lies flush with the top edge of the base plate after the feedthrough is cast into it, can also be of interest independently of the side wall projecting by a maximum of 5 cm as per the main claim and shall be disclosed accordingly. The flange can, for example, be arranged on a base body whose side wall protrudes further after casting into the base plate, in particular even beyond the subsequently constructed floor structure. The flange does not necessarily have to be arranged on a hollow base body; for example, a solid body made of foamed plastic material with a flange can also be provided, such as extruded polystyrene or polypropylene. In a particularly simple version, only a flange plate could be arranged on the casing pipe(s) (the pipe(s) could be inserted into this plate), with this arrangement then being cast in such a way that the flange or pipe(s) is flush with the casing pipe(s).the flange plate lies flush with the top edge of the base plate.

[0041] Preferably, the bushing generally has multiple outer casings, i.e., at least two, preferably at least three. Possible upper limits (independently of this) are, for example, a maximum of six or five outer casings; four outer casings are particularly preferred. Each section is then assigned its own outer casing, whereby the electrical / data sections can also be combined. In a preferred embodiment, the outer casings are assembled with the bushing's base body (see also above). The base body holds the outer casings in a relative position to each other; they can, in particular, be inserted into its base from below.

[0042] In a preferred embodiment, the bushing also features a retaining element located below the base body, which holds the outer tubes in a relative position. This can, for example, increase stability when adjusting the bushing before casting the base plate. A mounting device can then be attached to the retaining element and / or the base body, preferably to both. In principle, a retaining element made of metal is also conceivable, for example, bent sheet metal strips into which the outer tubes can be clipped. Preferably, however, the retaining element is made of a plastic material. Regardless of the material, it preferably has a plate shape (planar extension in the horizontal direction), with through-holes for the outer tubes. The outer tubes can be inserted into the plate, but the plate can also be divided and assembled around the outer tubes.

[0043] In a preferred embodiment, the retaining part is sealed against the casing pipes, for example with sealing rings pushed onto the casing pipes or a gasket molded onto the retaining part. The retaining part can then advantageously also serve as a water-stop flange.

[0044] In a preferred embodiment, the bushing with retaining element is adjusted so that the retaining element rests on a layer of fill before the foundation slab is poured. A surface seal is then preferably applied to the fill or leveling layer, i.e., below the subsequently poured foundation slab, and bonded to the retaining element. A plastic film is preferred as the surface seal, which is further preferably provided with a metal additive, such as aluminum. This arrangement can act as a radon seal (radon gas could be drawn from the ground through the building due to the chimney effect), with the bonding to the retaining element in the area around the casing pipes ensuring a reliable connection. Especially with a larger number of casing pipes, the retaining element significantly simplifies the bonding process. For this purpose, the retaining element is preferably designed as a plate, and particularly preferably has an outwardly projecting flange.

[0045] The penetration preferably includes a setup device for positioning and aligning it before grouting. This setup device can, for example, comprise a ground spike or stand that is placed in the excavated trench. The casing pipe and the grouting body are suspended from this, preferably via a further, height-adjustable stand section. Before grouting, the penetration is positioned at the desired height, using the top edge of the base slab as a reference. Before the base slab is poured, its thickness or height, and thus the position of its top edge, is generally known, unlike the thickness of the floor structure subsequently built upon it.

[0046] Also disclosed is a method for mounting a feedthrough, characterized by the features of use according to claim 1, preferably in combination with one or more of the dependent claims. Likewise, a method for manufacturing a base plate with a floor structure thereon, characterized by the features of use according to claim 1, preferably in combination with one or more of the dependent claims, is disclosed.

[0047] The invention will now be explained in more detail using an exemplary embodiment, whereby the individual features within the scope of the dependent claims may also be essential to the invention in other combinations, and no distinction will be made in detail between the different claim categories.

[0048] In detail, it shows Fig. 1 a feedthrough for pouring in an oblique view of; Fig. 2 the implementation according to Fig. 1 in a side view in an installation situation; Fig. 3. In schematic representation, the creation of the floor structure following the pouring of the base slab; Fig. 4 the basic body without cover part in an oblique view from above; Fig. 5 a subsequently attached mounting attachment from above with pipe socket in a side view; Fig. 6 A sealing element arranged at the upper end of a casing pipe in an axial section.

[0049] Fig. Figure 1 shows a feedthrough 1 in an oblique top view. The feedthrough 1 has four outer tubes 2 which are attached to a base body 3 from below. Seals 4 are arranged at the upper ends of the outer tubes 2, see Figure 1. Fig. 6 in detail. Furthermore, a multi-ribbed seal 5 is arranged on the outside of each of the casing tubes 2, below the base body 3; see also the side view according to Fig. 2.

[0050] The outer tubes 2 are held in their relative position not only by the base body 3, but also by a retaining element 6. The retaining element 6 is divided and assembled around the outer tubes 2. The passage 1 also has a cover element 7, in this case a multi-part cover element in relation to the base body. The cover element is in Fig. 1 is arranged outside the base body 3, but during casting it sits in a cavity 8 bounded by the base body 3. This cavity 8 is open at the top and is bounded by a bottom part 3.1 and a side wall 3.2 of the base body 3. The inserted cover part then rests on the seals 4, thus sealing the outer casing tubes 2 at the top. An upper surface of the cover part is then flush with an upper edge of the side wall 3.2.

[0051] Fig. Figure 2 shows the penetration 1 in an installed position. A trench 21 has been excavated in the ground 20. The foundation slab 30 will later be poured above this trench, and the building will be erected. The penetration 1 is positioned at a height using a mounting device 22, in this case a height-adjustable ground spike, such that the upper end of the base body 3 coincides with the top edge 23 of the subsequently poured foundation slab 30. A protective pipe 24 (one of which is shown in the sketch) is connected to each of the casing pipes 2. The protective pipes 24 run in the trench 21 to a connection point at the road.

[0052] After the trench 21 has been filled (and is therefore shown with dashed lines), a surface seal 25 is attached to the retaining part 6, which then rests on a fill 26 (the base plate 30 is poured on top of this).

[0053] Fig. Figure 3 schematically depicts the situation after the concrete base slab 30 has been poured. The base body 3 is flush with the top edge 23 of the base slab 30. A floor structure 31 (screed, etc.) is then constructed on top of it. To maintain a cavity 32 above the casing pipes 2, particularly during the pouring of the screed, a formwork element 35 is provided. In this case, the flush-cast cover piece is removed from the cavity 8 and replaced with a taller foam body (this forms the formwork element 35). Alternatively, a foam strip could be glued to the side wall 3.2, to the inner wall surface in the case of flush installation (or to the outer wall surface in the case of installation with an overhang). In another variant, not shown, the cover piece could already be designed with a corresponding height, thus also serving as the formwork element 35.When constructing the floor structure 31, the cavity 32 is kept clear; the casing pipes 2 are accessible from above after removing the formwork element 35.

[0054] Fig. Figure 4 shows the installation 1 from a slightly elevated angle, without formwork element 35 or cover part. The [unclear text] is then inserted from above. Fig. The mounting attachment 50 shown in Figure 5 is inserted. This attachment has a flange plate 51 to which downwardly extending pipe stubs 52 are arranged. Each pipe stub 52 is inserted into a respective casing pipe 2 and sealed against it with a gasket (not shown). The flange plate 51 rests on the upper edge 32 of the floor assembly 31. The actual pipe 53 can then be laid through each of the four pipe systems (consisting of casing pipe, pipe stubs, and protective pipe) and sealed against the mounting attachment 50.

[0055] Fig. Figure 6 shows a detailed view of the upper end of a casing pipe 2 in an axial section. This illustrates in particular the seal 4, which has an inwardly projecting sealing lip 4.1. Fig. Figure 6 shows the component in its unloaded state; neither the cover part is in place nor is a pipe fitting 52 inserted. In this unloaded state, the sealing lip 4.1 extends not only inwards but also slightly diagonally upwards. As a result, it can reliably seal against the cover part or the formwork element 35.

[0056] When the pipe fitting 52 of the mounting attachment 50 is inserted, the sealing lip 4.1 is folded downwards, and it then lies between the pipe fitting 52 and the outer casing 2. In this position, the pipes 2 and 52 block any movement of the sealing lip 4.1 back into its shape when unloaded, so that it seals reliably even with pressure fluctuations in the pipes 2 and 52.

Claims

[1] Use of a feedthrough (1) for casting into a base plate (30) and passing a conduit (53) through it, which carrying out (1) has a casing tube (2) and a base body (3) which is arranged at an upper end of the casing tube (2), wherein the base body (3) has a bottom part (3.1) and a side wall (3.2) and thus forms a cavity (8) at the upper end of the casing tube (2), wherein the passage (1) further comprises a cover element (7) which covers the cavity (8) formed by the base body (3) when pouring it into the base plate (30), wherein the outer tube (2) and the base body (3) are cast into the base plate (30), the base body (3) being cast flush with the top edge (23) of the base plate (30), wherein the cover element (7) is also cast flush into the base plate (30), namely, the top of the cover element (7) is flush with the top edge (23) of the base plate (30) after being cast into the base plate (30), and wherein, after the pouring of the base slab (30), a floor structure (31) is built on it, wherein a cavity (32) is kept free at the upper end of the casing pipe (2), and wherein, after the pouring of the base slab (30), the line (53) is laid through the casing pipe (2), wherein a pipe stub (52) of a mounting attachment (50) extends the casing pipe (2) upwards. [2] Use according to claim 1, wherein the mounting attachment (50) is only attached to the feedthrough (1) after the casing tube (2) and the base body (3) have been cast into the base plate (30), wherein the pipe stub (52) is then attached to the casing tube (2) from above. [3] Use according to claim 2, wherein the mounting attachment (50) is attached to the casing pipe (2) before the floor structure (31) is built. [4] Use according to claim 3, wherein a flange plate (51) of the mounting attachment (50) is arranged at the level of an upper edge of the floor structure (31) to be constructed before the floor structure (31) is constructed, [5] Use according to claim 3 or 4, wherein the cavity (32) at the upper end of the casing pipe (2), namely above the casing pipe (2), is kept free of the pipe nozzle (52) of the mounting attachment (50) when constructing the floor structure (31). [6] Use according to one of the preceding claims, wherein the cover element (7) is a multi-part cover part to the base body (3), which is removed from or taken out of the base body (3) after the base plate (30) has been cast. [7] Use according to claim 6, wherein the cover part is arranged in the cavity (8) of the base body (3) when the base body (3) is poured into the base plate (30). [8] Use according to claim 6 or 7, wherein the cover part is made of a foamed plastic material. [9] Use according to claim 7 or 8, wherein the cover part sits on the upper end of the casing tube (2), the cover part and the casing tube (2) being sealed against each other by a seal (4). [10] Use according to claims 2 and 9, wherein the seal (4) remains on the casing tube (2) when the cover part is removed from the base body (3) and seals against the pipe socket (52) after the mounting attachment (50) is placed on it. [11] Use according to claim 10, wherein the seal (4) has a sealing lip (4.1) that protrudes inwards or outwards in the unloaded state, which is turned downwards when the pipe fitting (52) is attached and lies between the pipe fitting (52) and the casing pipe (2). [12] Use according to claim 10 or 11, wherein the seal (4) has a sealing lip (4.1) that protrudes inwards or outwards in the unloaded state and extends obliquely upwards towards its free end in the unloaded state. [13] Use according to one of the preceding claims, wherein a flange is provided on the base body (3) which, after the base body (3) has been cast into the base plate (30), lies flush with its upper edge (23), wherein a surface seal (25) is machined onto the flange on the base plate (30) before the floor structure (31) is created. [14] Use according to one of the preceding claims, wherein the feedthrough (1) has a plurality of sheath tubes (2) arranged on the base body (3), wherein a retaining part (6) is additionally arranged below the base body (3) which holds the sheath tubes (2) in a relative position to each other. [15] Use according to claim 14, wherein the retaining part (6) is sealed to the casing tubes (2). [16] Use according to claim 14 or 15, wherein the retaining part (6) sits on a fill (26) on the ground (20) before the base plate (30) is poured, wherein a surface seal (25) is formed on the fill (26) against the retaining part (6) before the base plate (30) is poured.

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