DE102021124483A1 - Method for producing a concrete ceiling, ceiling system from concrete ceiling and existing ceiling, concrete ceiling, building - Google Patents

Abstract

The invention relates to a method (300) for producing a concrete ceiling (100) for a building (1000) with an existing ceiling (1040), the existing ceiling (1040) having at least one existing ceiling support (1042), comprising the step:
- Placing (310) at least one precast beam (120) in a wall support (1012) of a building wall (1010) of the building (1000), the precast beam (120) being at least partially arranged next to the existing ceiling beam (1042).
According to the invention, the following steps are provided in the method:
- Stationary arrangement (320) of at least one formwork panel (140) in relation to the at least one precast beam (120),
- Concreting (330) an in-situ concrete slab (160) onto a formwork surface (150) formed by the at least one precast girder (120) and/or the at least one formwork panel (140).

Description

In a first aspect, the invention relates to a method for producing a concrete ceiling for a building with an existing ceiling according to claim 1. The invention also relates in a second aspect to a ceiling system made of a concrete ceiling and an existing ceiling, in a third aspect to a concrete ceiling, and in a fourth aspect, a building.

In buildings with an existing ceiling, structural changes can mean that the existing ceiling no longer meets the structural requirements, particularly with regard to fire protection, statics, energy aspects and/or noise insulation. In such a case, the existing ceiling can be strengthened, for example by lashing steel girders. Such a use requires a not inconsiderable intervention in the existing ceiling and places additional demands on fire protection, for example a relatively complex provision of fire protection cladding.

In such a case, the existing ceiling can also be completely removed and replaced with a new ceiling. For this purpose, for example, solid reinforced concrete ceilings can be used, which are generally characterized by high stability. However, these result in a relatively high construction height and usually require extensive intervention in the existing building, in particular the removal or fundamental adjustment of the roof structure. A support in the floor below is also necessary during production.

Another advantageous approach - especially compared to upgrading or replacing the existing ceiling - is to retrofit a new ceiling, in addition to the existing ceiling.

One approach to producing a ceiling is what are known as hanging brick ceilings, in which so-called brick filling bodies are suspended between brick support belts to produce a ceiling. In principle, the brick girder flanges cannot be inserted between the existing ceiling beams, since the lower edge of the brick filler should be at the same height as the lower edge of the brick girder flanges when installed. The brick girder belts can therefore only be arranged above or instead of the existing ceiling. If it is arranged above the existing ceiling, the result is a significant increase in storey height. In addition, the brick fillers are prefabricated with predefined dimensions, so that the brick carrier belts must be laid in grid spacing. Creating a concrete ceiling in a building with an existing ceiling, in particular retrofitting a concrete ceiling in such a building, is subject to particular challenges. In addition to the above-mentioned structural advantages of a concrete ceiling, it is desirable to cause the least possible adjustments to the building with the new concrete ceiling and the least possible impairments to the use of the building during production.

DE606522C describes a fireproof ceiling that can be installed in an existing building with a wooden beam ceiling. The fireproof ceiling described there is formed by assembling shaped blocks and supporting beams and then filling in concrete over the supporting beams and between the shaped blocks formed, elongated cavities. In accordance with the purpose of the fireproof ceiling DE606522C is the protection of roof truss fires and collapses.

Despite these fundamentally advantageous approaches, methods for producing concrete ceilings in buildings with an existing ceiling are still in need of improvement, particularly with regard to the production costs and the stability of the concrete ceiling to be produced. Furthermore, this also applies to the fewest possible changes to the building caused by the production of the concrete ceiling and the least possible impairment of the use of the building during production.

It would therefore be desirable to improve methods for producing a concrete pavement and concrete pavements with regard to at least one of the problems mentioned. In particular, methods for producing a concrete ceiling and concrete ceilings are to be improved in terms of production costs and stability, as well as fire protection and soundproofing properties.

This is where the invention comes in, the object of which is to specify a method for producing a concrete surface and a concrete surface in an improved manner, in particular with regard to at least one of the problems mentioned.

The object relating to the method is solved by the invention with a method of claim 1. The invention is based on a method for producing a concrete slab for a building with an existing slab, the existing slab having at least one existing slab beam, having the step of placing at least one precast girder in a wall support of a building wall of the building, the precast girder being at least partially next to the Existing ceiling support is arranged.

According to the invention, the method provides: stationary arrangement of at least one formwork panel in relation to the at least one precast beam; Concreting an in-situ concrete slab onto a formwork surface formed by the at least one precast girder and/or the at least one formwork panel.

The invention is based on the consideration that producing a concrete ceiling in a building with an existing ceiling advantageously improves the stability and the fire protection and soundproofing properties of the building or the ceiling system consisting of the existing ceiling and concrete ceiling. By producing the concrete slab in such a way that the at least one precast girder is at least partially arranged next to the existing slab girder, a low construction height of the concrete slab is advantageously achieved, in particular in comparison to methods of the prior art such as the above-mentioned hanging brick slabs or solid reinforced concrete slabs. "Next to the existing floor girder" means that the at least one precast girder is fastened to the building wall in such a way that a vertical overlap occurs between the at least one precast girder and the existing slab girder, or in other words: that a precast girder underside facing away from the in-situ concrete slab below one facing the in-situ concrete slab Inventory carrier top of the existing ceiling support is arranged. "Below" means that the underside of the precast beam has a lower height in relation to a vertical direction than the top side of the stock beam. By arranging at least one formwork panel in a stationary manner in relation to the at least one precast girder, a formwork surface is formed which represents a horizontally continuous barrier and thus enables an in-situ concrete panel to be cast on it. After the curing of the in-situ concrete slab, a concrete T-beam ceiling is advantageously created. An in-situ concrete slab, which is supported by the prefabricated girder and is therefore independent of the existing ceiling, improves the sound and fire protection properties as well as the static properties.

An essential finding of the invention is based on the fact that by concreting an in-situ concrete slab on the formwork surface, a stable connection is produced between the at least one precast girder and the in-situ concrete slab. After the in-situ concrete slab has hardened, a reinforced concrete T-beam ceiling is created that has very good stability properties. At the same time, the arrangement of the at least one precast beam at least partially next to the existing ceiling beam achieves a vertical overlapping of the concrete ceiling with the existing ceiling, which advantageously results in a lower construction height. The concrete ceiling protrudes from above into the existing ceiling, so to speak.

The invention also includes the finding that the use of an in-situ concrete slab has significant advantages--in particular in comparison to the use of finished concrete surface modules for producing a ceiling as in the prior art. One of the advantages is the flexibility in arranging the precast beams. Since the prefabricated girders do not have to be arranged in a distance grid specified by any surface modules, their arrangement can be flexibly adapted to the existing distance between the existing ceiling girders. In particular, a precast girder can be arranged between two existing ceiling girders. The prefabricated girders can advantageously be used as prefabricated girders that are already load-bearing during construction for the production of the concrete ceiling, usually without a support or structural intervention in the floor below being necessary. The invention also includes the finding that the use of the in-situ concrete slab reduces the effort involved in producing the concrete ceiling. Compared to methods with concrete surface modules or similar surface modules, a relatively small opening in the roof of the building or an existing window is sufficient in a method according to the invention to transport the precast girders to their installation site and, for example, other materials such as components of the slab reinforcement and a concrete pump hose to produce the in-situ concrete slab. A high level of stability is also achieved by using the in-situ concrete slab, in particular in comparison to existing approaches based on several concrete surface modules.

With a continuously formed in-situ concrete slab, there are no material boundaries as with any concrete surface modules, which also improves the energetic, sound-insulating and fire protection properties. The statics of the building, especially with regard to the floor above the concrete ceiling, are also significantly improved. For example, support loads can be better transferred. There is also no need to fabricate any concrete surface modules, since the in-situ concrete slab can be flexibly adapted to the individual building using the formwork panels and, if necessary, other formwork elements.

Advantageous developments of the invention can be found in the dependent claims and specify advantageous options in detail, the concept explained above within the scope of the task benstellung as well as to realize other advantages.

The building wall includes all load-bearing, especially vertical, structures of the building, especially interior walls and exterior walls, as well as beams. The method can advantageously be used to retrofit the concrete ceiling in addition to the existing ceiling in the building. The terms "below" and "above" refer to a vertical direction. The underside of the precast girder faces away from the in-situ concrete slab. The underside of the stock carrier faces away from the in-situ concrete slab. The at least one formwork panel remains in its position in the concrete ceiling as permanent formwork, in particular after the in-situ concrete panel has hardened.

The wall support is preferably a masonry support. Placing the at least one precast girder in the wall support preferably includes placing a first front end section of the precast girder in a first masonry support and placing an opposite second front end section of the precast girder in a second masonry support. The first wall support is preferably arranged in a first part of the building wall and the second wall support is arranged in a second part of the building wall. The first wall support and the second wall support are advantageously arranged in a common horizontal support plane. The at least one precast beam is preferably placed from above onto the fastening position on at least two wall supports. "From above" refers to a vertical direction meaning from the floor above. The wall support preferably comprises a mortar bed to form a support surface for the precast beam. In other developments, one or more wall supports can include a soundproofing bearing, for example in the form of a soundproofing base. The wall support and the prefabricated beam are advantageously further decoupled by means of a sound insulation bearing.

The stationary arrangement of the at least one formwork panel preferably includes fastening the at least one formwork panel to the precast carrier or placing the at least one formwork panel on the precast carrier. The stationary arrangement particularly preferably includes placing the at least one formwork panel on a bearing fold or similar recess in the precast girder.

The method preferably provides that the at least one formwork panel is arranged and designed to close the space between two precast girders or between a precast girder and the building wall by forming a continuous formwork surface in a horizontal plane, in order to improve the concreting of an in-situ concrete slab make possible. The precast beams and the formwork panel preferably form a closed, horizontal plane in the form of the formwork surface as the lower boundary for the in-situ concrete panel.

The concreting of the in-situ concrete slab preferably includes, in particular complete, enclosing of a connecting section of a girder reinforcement of the prefabricated girder by the in-situ concrete slab. The concreting of the in-situ concrete slab is preferably carried out in such a way that a minimum thickness in accordance with DIN 4102, particularly preferably 100 mm, and at least a minimum center distance in accordance with DIN 4102 are maintained in the in-situ concrete slab.

As part of a preferred development, it is provided that the at least one precast girder is fastened to the building wall in such a way that a precast girder underside is arranged above an existing girder underside of the existing slab girder. The at least one precast girder is particularly preferably fastened to the building wall in such a way that the underside of the precast girder is arranged above a defective floor of the existing ceiling.

As part of a preferred development, it is provided that the at least one precast girder is fastened to the building wall and/or the at least one formwork panel is arranged stationary in relation to the at least one precast girder in such a way that the in-situ concrete slab and the formwork panel do not touch the at least one existing floor girder . The in-situ concrete slab is preferably designed as a continuous concrete slab that extends essentially completely over the existing ceiling. The supporting fold and the formwork panel are preferably designed in such a way that a horizontally flat formwork surface results. The existing ceiling support can be designed differently depending on the construction of the building. For example, the existing ceiling beam can be used as a wooden existing ceiling beam or steel existing ceiling beam or steel stone existing ceiling beam or reinforced concrete existing ceiling beam. A wooden existing ceiling support is designed in particular as a wooden beam.

Preferably, the method also has the step: taking measurements of the existing ceiling, in particular the position of the existing ceiling supports. Based on the measurements taken, the components of the concrete ceiling can be planned and prefabricated.

The method preferably also has the step: planning the position of the prefabricated girders, taking into account the existing position of the existing ceiling girders. The prefabricated girders are particularly preferably arranged in such a way that they run essentially centrally between the existing slab girders and parallel to them.

The method preferably further comprises the step: statically dimensioning the construction of the concrete cover. In particular, the static dimensioning includes determining a strength of the in-situ concrete slab, and a girder strength and a girder width of the prefabricated girder in order to meet the static requirements for the concrete cover. A beam spacing to be provided between the prefabricated beams is also determined, which is advantageously determined as a function of a beam spacing between the adjacent existing beams.

The method preferably also has the step: checking the existing ceiling supports or other components of the existing ceiling and/or the building, in particular for biotic damage. Such testing can preferably be carried out after the existing floor has been exposed - as part of the production of the concrete floor. By means of such a test, hidden damage, in particular biotic damage, can be detected and eliminated with relatively little effort--especially compared to a later point in time after the concrete cover has been completed. Depending on the testing, the affected existing ceiling supports or other components of the existing ceiling or of the building can advantageously be renovated if required.

The method preferably also has the step of: producing at least one wall support in the building wall with a support surface for supporting the precast beam, particularly preferably at least a first wall support with a first support surface and a second wall support with a second support surface, with the at least first and second support surface lie approximately in a common horizontal support plane.

The method preferably also has the step of installing a rail system with a hoist in the floor above the existing ceiling, particularly preferably in the attic. By means of such a rail system, which is temporarily introduced into the building during the manufacture of the concrete ceiling, the precast girders can advantageously be transported to their place of installation without any major physical exertion. The hoist can in particular include a block and tackle.

The method preferably also has the step of producing an opening in the building, preferably in a roof of the building. The components for producing the concrete cover, in particular the prefabricated girders, can advantageously be transported to their place of installation by means of an opening. In other developments of the method, it is also possible for an existing door or an existing window, in particular a skylight, to be used as an opening.

The method preferably also has the step: providing the at least one prefabricated carrier. The prefabricated beams are particularly preferably prefabricated, in particular in the form of reinforced concrete beams. The prefabricated beams can advantageously be prefabricated outside the building, for example in a concrete plant. A prefabricated beam is particularly preferably provided which fulfills at least one, particularly preferably all, minimum center distances according to DIN 4102.

The method preferably also has the step of distributing the prefabricated beams, in particular via the rail system and/or the hoist, to their respective installation position.

The method preferably also has the step of installing insulation, preferably cavity insulation, particularly preferably between the concrete ceiling and the existing ceiling. Insulation is preferably installed before the at least one formwork panel is fixed in place.

Preferably, the method also has the step: after placing the at least one precast girder in a wall support: fastening the at least one precast girder in or on the wall support, particularly preferably walling in the at least one precast girder in the wall support and/or in the building wall.

The method preferably also has the step of arranging a plate reinforcement on the formwork surface. The slab reinforcement is particularly preferably arranged before the in-situ concrete slab is cast in concrete. In preferred developments, the plate reinforcement is designed as a steel plate reinforcement. In other developments, the plate reinforcement is designed as a fiber plate reinforcement, preferably a glass fiber and/or carbon fiber plate reinforcement.

The method preferably also has the step of arranging formwork elements on the formwork surface to produce recesses in the in-situ concrete slab, in particular for cable routing. The arrangement is particularly preferred ning formwork elements before concreting the in-situ concrete slab.

The method preferably also has the step: curing of the in-situ concrete slab. The method preferably also has the step of applying a sealing membrane to the in-situ concrete slab. The method preferably also has the step of applying a floor structure to the in-situ concrete slab and/or to the sealing strip. The floor structure preferably includes impact sound insulation and/or a mineral screed and/or a floor covering.

The precast girder preferably has a rough joint and/or toothed joint and/or a similar surface structure on a precast girder upper side for an improved connection with the in-situ concrete slab.

The precast girder is preferably designed as a reinforced concrete beam. The precast girder and/or the reinforced concrete beam preferably has a girder reinforcement. The girder reinforcement is preferably designed as a steel girder reinforcement. In other developments, the carrier reinforcement is designed as a fiber carrier reinforcement, preferably a glass fiber and/or carbon fiber carrier reinforcement. The girder reinforcement is preferably arranged and designed in such a way that it has a connecting section which protrudes from a concrete segment of the precast girder, particularly preferably on a top side of the precast girder. Such a connecting section is advantageously designed to be connected to the in-situ concrete ceiling in a form-fitting manner. The precast girder preferably has at least one lifting anchor, which is particularly preferably embedded in concrete in the concrete segment of the precast girder. The in-situ concrete slab is preferably connectable or connected to the at least one precast girder in a form-fitting and/or material-fitting manner.

In other developments of the method or the concrete cover, the prefabricated girder can be designed differently, for example as a steel girder. A steel girder of this type can in particular be designed as a double-T steel girder with headed bolts on an upper chord, the headed bolt being designed to be connected to the in-situ concrete ceiling in a form-fitting manner.

The in-situ concrete slab is preferably produced by concreting on the formwork surface. The in-situ concrete slab is preferably a reinforced concrete ceiling. The in-situ concrete slab preferably has a slab reinforcement. The in-situ concrete slab is preferably connected to the at least one precast girder in a form-fitting and/or material-to-material manner. The slab reinforcement is preferably arranged on the inside in the in-situ concrete slab. The slab reinforcement preferably comprises steel rods, which are preferably arranged crosswise and/or approximately parallel to the formwork surface.

The at least one precast girder is preferably arranged in an intermediate girder zone between at least two existing slab girders. "Between two existing floor supports" means in particular "next to two adjacent existing floor supports".

The concrete ceiling is preferably arranged in such a way that it does not touch the at least one existing ceiling support, particularly preferably the entire existing ceiling. In particular, the at least one precast girder and the at least one formwork panel are spaced apart from the existing slab girder of the existing slab. Such a non-touching or such a spacing advantageously achieves a decoupling of the concrete ceiling from the existing ceiling. Significant advantages result from such a decoupling, in particular with regard to soundproofing and thermal insulation.

The at least one precast girder is preferably arranged essentially parallel to the at least one existing slab girder. The at least one precast girder is preferably arranged essentially centrally between two adjacent existing slab girders. The at least one precast girder is preferably arranged essentially horizontally, in particular on a horizontal support plane.

As part of a preferred development, it is provided that the at least one prefabricated beam and/or the at least one formwork panel does not touch the at least one existing floor beam. This means in particular that no prefabricated beams, no formwork panel and no in-situ concrete panel are in direct contact with an existing ceiling beam, in particular one that transmits structure-borne noise and/or heat.

The at least one precast part carrier preferably has a receiving feature, preferably a support fold, for receiving the at least one formwork panel in a form-fitting manner. A receiving feature is configured to receive and hold the formwork panel in place. The support fold is preferably designed as a recess with a rectangular cross-section that extends along a beam axis on the outside of the upper side of the precast girder. The at least one precast girder is preferably designed and fastened to the building wall in such a way that a storage surface of the support seam and/or the formwork panel a ceiling distance is arranged in the vertical direction above a stock support top.

The concrete ceiling preferably has a sealing strip arranged on the in-situ concrete slab. The concrete ceiling or the ceiling system preferably has insulation, particularly preferably cavity insulation. The insulation is preferably arranged between the concrete ceiling and the existing ceiling, particularly preferably flatly below the at least one formwork panel and/or below the at least one precast girder. Insulation advantageously reduces the transmission of sound and/or heat between the existing ceiling and the concrete ceiling.

An upper slab side of the in-situ concrete slab facing away from the at least one reinforced concrete girder is preferably arranged in the vertical direction in a range of 5 cm to 20 cm, preferably 12 to 15 cm, particularly preferably 13 cm from an existing girder top side of the existing slab girder facing the in-situ concrete slab.

The in-situ concrete slab preferably has a thickness in the vertical direction in a range from 5 cm to 20 cm, preferably from 7 to 13 cm, particularly preferably 10 cm.

The prefabricated beam preferably has a beam thickness in the vertical direction in a range from 10 cm to 25 cm, preferably from 15 to 20 cm, particularly preferably 18 cm. The prefabricated beam preferably has a beam width in a horizontal direction in a range from 8 cm to 30 cm, preferably from 12 cm to 18 cm, particularly preferably 15 cm.

The concrete cover preferably has an overall thickness in the vertical direction in a range from 20 cm to 40 cm, preferably from 25 cm to 35 cm, particularly preferably 30 cm.

A ceiling spacing between the existing ceiling support and the formwork panel in the vertical direction is preferably between 1 cm and 5 cm, preferably between 2 cm and 4 cm, particularly preferably 2 cm.

The slab reinforcement and/or the girder reinforcement is preferably made of reinforcing steel, particularly preferably of type B500. In other developments, the plate reinforcement and/or the carrier reinforcement is formed from fibers or fiber strands, in particular from carbon and/or glass fibers. The at least one precast beam is preferably a reinforced concrete beam. The at least one reinforced concrete beam is preferably made of type C30/37 or C35/45 concrete. In-situ concrete slab is preferably made of type C25/30 concrete. The type of concrete can be determined in particular according to static requirements. The precast girder and/or the in-situ concrete slab can also be made from other types of concrete, preferably from a concrete from a concrete strength class of C20/25 to C50/60.

The concrete ceiling preferably corresponds to fire resistance class F90A in accordance with DIN 4102. In the in-situ concrete slab with regard to the slab reinforcement and in the at least one precast girder with regard to the girder reinforcement, at least one minimum center distance, preferably all minimum center distances, in accordance with DIN 4102 are particularly preferably observed. A minimum thickness is preferably maintained in relation to the in-situ concrete slab. The thickness and/or the minimum thickness of the in-situ concrete slab is particularly preferably 100 mm. In particular, the concrete ceiling is designed to be fire-resistant. The minimum thicknesses, in particular a minimum value for the thickness of the in-situ concrete slab, and minimum center distances according to DIN 4102 are preferably observed. In particular, the minimum center distance describes a distance by which the reinforcement in the concrete must be offset inwards from the outside of the in-situ concrete slab or the precast girder and must therefore be at least removed. This ensures improved protection in the event of a fire.

The at least one existing ceiling support is preferably a wooden existing ceiling support and the existing ceiling is a wooden beam existing ceiling. The existing ceiling is preferably an upper existing ceiling between an upper full floor and an attic of the building.

The at least one existing floor support is preferably a steel block existing floor support and the existing floor is a steel block existing floor. The existing ceiling is preferably a lower existing ceiling between a basement and a lower full floor of the building.

The existing ceiling is preferably an intermediate existing ceiling between two full storeys of the building. The building is preferably an old building built before 1950. In particular, the building wall is or includes masonry.

The invention for solving the problem in a second aspect to a ceiling system for a building consisting of an existing ceiling and a concrete ceiling, wherein the existing ceiling has at least one existing ceiling beam, and the concrete ceiling has: at least one prefabricated beam that can be connected to a building wall of the building in a stationary manner or is connected, preferably placed on or in a wall support in the building wall or can be placed, the precast carrier little is arranged at least partially next to the existing floor girder, at least one formwork panel that is stationary in relation to the at least one precast girder, and an in-situ concrete slab, which is connected to the at least one precast girder and rests on an underside facing the existing slab by a through the at least one precast girder and/ or the formwork surface formed by at least one formwork panel is limited.

The invention for solving the problem in a third aspect relates to a concrete ceiling for a building with an existing ceiling, the existing ceiling having at least one existing ceiling support, the concrete ceiling having: at least one prefabricated support which can be connected in a stationary manner to a building wall of the building can be placed on or in a wall support in the building wall, with the precast girder being arranged at least partially next to the existing slab girder, at least one shuttering panel arranged stationary in relation to the at least one precast girder, and an in-situ concrete slab, which is connected to the at least one precast girder and rests on an underside facing the existing ceiling is delimited by a formwork surface formed by the at least one precast beam and/or the at least one formwork panel. The concrete cover is preferably produced using a method according to the first aspect of the invention.

The invention for solving the problem in a fourth aspect to a building comprising a concrete ceiling produced by a method according to the first aspect of the invention and/or a concrete ceiling according to the second aspect of the invention and/or a ceiling system according to the third aspect of the invention .

It is to be understood that the method according to the first aspect of the invention, the pavement system according to the second aspect of the invention, the concrete pavement according to the third aspect of the invention and the building according to the fourth aspect of the invention have the same and similar sub-aspects as specifically identified are laid down in the dependent claims. In this respect, for the development of one aspect of the invention, reference is also made to the developments of the other aspects of the invention. In particular, features of the concrete ceiling and/or the ceiling system are to be regarded as disclosed as process features for the process. Conversely, the results of process features or process steps are disclosed as device features for the concrete ceiling and/or the ceiling system.

Embodiments of the invention are now described below with reference to the drawing in comparison to the prior art, some of which is also shown. This is not necessarily intended to represent the embodiments to scale, rather the drawing is in schematic and/or slightly distorted form where it is useful for explanation. With regard to additions to the teachings that can be seen directly from the drawing, reference is made to the relevant state of the art. In this context, it must be taken into account that a wide variety of modifications and changes relating to the form and detail of an embodiment can be made without deviating from the general idea of the invention. The features of the invention disclosed in the description, in the drawing and in the claims can be essential both individually and in any combination for the further development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawing and/or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below, or limited to any subject matter which would be limited compared to the subject matter claimed in the claims. In the case of specified design ranges, values within the specified limits should also be disclosed as limit values and be usable and stressable as desired.

• 1 eine Querschnittsansicht einer bevorzugten Ausführungsform einer Betondecke gemäß dem Konzept der Erfindung in einem Deckensystem mit einer Bestandsdecke,
• 2 eine Seitenansicht der in 1 gezeigten bevorzugten Ausführungsform,
• 3 eine Detailansicht der in 1 gezeigten Ausführungsform zur Verdeutlichung einer Verbindung eines Fertigteilträgers mit der Ortbetondecke,
• 4 eine schematische Darstellung einer bevorzugten Ausführungsform des Verfahrens gemäß dem Konzept der Erfindung,
• 5 eine Querschnittsansicht einer weiteren bevorzugten Ausführungsform eines Deckensystems mit einer Betondecke gemäß dem Konzept der Erfindung,
• 6 eine schematische Ansicht eines Gebäudes mit zwei bevorzugten Einbaupositionen für eine Betondecke gemäß dem Konzept der Erfindung.

Further advantages, features and details of the invention result from the following description of the preferred embodiments and from the drawing; this shows in:

• 1 a cross-sectional view of a preferred embodiment of a concrete ceiling according to the concept of the invention in a ceiling system with an existing ceiling,
• 2 a side view of the in 1 preferred embodiment shown,
• 3 a detailed view of the in 1 shown embodiment to illustrate a connection of a precast girder with the in-situ concrete ceiling,
• 4 a schematic representation of a preferred embodiment of the method according to the concept of the invention,
• 5 a cross-sectional view of another preferred embodiment of a ceiling system with a concrete ceiling according to the concept of the invention,
• 6 a schematic view of a building with two preferred installation positions for a concrete pavement according to the concept of the invention.

1 Figure 12 shows a cross-sectional view of a preferred embodiment of a concrete pavement 100 made by a method according to the concept of the invention. Shown is a section of a ceiling system 600 with an existing ceiling 1040 and a concrete ceiling 100. The existing ceiling 1040 is an existing wooden beam ceiling 1056. Two prefabricated beams 120 are visible from the concrete ceiling 100, which are in a building wall that is not visible here and is outside the plane of the drawing 1010 are attached. The two prefabricated beams 120 are arranged at a beam spacing AT from one another. Three existing ceiling supports 1042 in the form of wooden existing ceiling supports 1043 are visible from the existing ceiling 1040 . The existing ceiling beams 1042 are spaced a joist spacing AB apart. The girder spacing AT can be determined in particular as a function of the girder spacing AB, preferably, as here, in such a way that a prefabricated girder 120 is arranged essentially centrally and parallel between two existing ceiling girders 1042. The prefabricated beams 120 are fastened in the building wall 1010 in such a way that they are each partially arranged next to the existing ceiling beam 1042 . "Partly" means in particular that there is a partial vertical overlap UV of precast girder 120 and existing floor girder 1042 and thus a precast girder underside 126 of the precast girder is arranged in a vertical direction V below an inventory girder top 1044 of the existing slab girder 1042; or in other words, that the prefabricated beam 120 projects from above partially between two existing ceiling beams 1042, namely in an intermediate beam zone 1048 formed between two existing ceiling beams 1042.

A formwork panel 140 is inserted between each two precast beams 120 . For this purpose, each precast girder 120 has a support fold 124 on each side facing a formwork panel 140 in the region of a precast girder top side 127 , which in each case forms a storage area for the formwork panel 140 . Formwork panel 140 is preferably formed of plywood, plastic, a composite material, or like suitable material. The formwork panel 140 preferably has a thickness in a range from 1 cm to 4 cm, preferably 2 cm as shown here. As shown here, the supporting fold 124 is preferably designed and arranged in such a way that after the formwork panel 140 has been inserted, a flat, continuous formwork surface 150 is produced. The prefabricated girders 120 are advantageously arranged and fastened in such a way that the stationary formwork panel 140, which is inserted here in the support rabbet 124, is arranged at a ceiling distance BA from the existing slab girder 1042. As shown here, a decoupling of the concrete ceiling 100 and the existing ceiling 1040 is advantageously possible as a result of the ceiling distance BA. This means in particular that between the concrete cover 100 on the one hand, i. H. the in-situ concrete slab 160, the formwork panels 140 and the prefabricated girder 120, and the existing ceiling girder 1042, on the other hand, there is no direct contact. Advantageously, the decoupling achieves better insulating properties, in particular with regard to sound insulation. Insulation 190, preferably cavity insulation 192 as shown here, can advantageously be arranged between the concrete ceiling 100 and the existing ceiling 1040. The cavity 196 between the concrete ceiling 100 and the existing ceiling support 1042 that is created by the ceiling distance BA is advantageously left open, that is to say it is not covered with cavity insulation 192 . Nevertheless, lining the cavity 196 with cavity insulation 192 is possible in other embodiments. The cavity insulation 192 is preferably designed in such a way that, despite contact with the concrete ceiling 100 and the existing ceiling 1040, it does not allow any significant sound transmission. Cavity insulation 192 preferably has mineral fibers. Due to the structure with the in-situ concrete slab 160 and the prefabricated girders 120 connected thereto, the concrete ceiling 100 is designed as a T-beam ceiling 102 .

The existing ceiling 1040 has false floors 1026, which are each attached between the existing ceiling beams 1042.

The existing ceiling 1040 has a fill 1022 between the existing ceiling supports 1042, here on the missing floors 1026. If necessary, this can be partially removed in order to allow the prefabricated beams 120 to be arranged. The inventory cover 1040 has an inventory sub-cover 1024 which is attached to the inventory support underside 1046 . Advantageously, the existing suspended ceiling 1024, and preferably also the defective floors 1026, as shown here, remain essentially unchanged during the production of the concrete ceiling 100 in the method according to the concept of the invention.

In 1 a sealing membrane 170 is shown schematically and in part above the in-situ concrete slab 160 on an upper slab side 166, which can preferably be applied to the hardened in-situ concrete slab 160 as protection against the weather and/or moisture. Furthermore, a floor structure 180 is shown in an analogous manner, which includes impact sound insulation 182, a mineral screed 184 and a floor covering 186.

By arranging formwork elements 148 on the formwork surface 150 before concreting the in-situ concrete slab 160, recesses 168 can be produced, as indicated here by dashed lines, which can be used, for example, as line guides 169.

In 2 the ceiling system 600 is shown partially in a side view. A prefabricated girder 120 of the concrete ceiling 100 is visible, which is fastened to an inner wall 1016 of the building wall 1010 at a first front end section 125.1. the prefabricated girder 120 is fastened to an opposite, second end section 125.2 on an outer wall 1018 of the building wall 1010. The first frontal end section 125.1 is fastened in a first wall support 1012.1 resting on a first bearing surface 1014.1. The second front end section 125.2 is fastened in a second wall support 1012.2, resting on a second bearing surface 1014.2. The bearing surface 1014 is preferably designed as a mortar bed on which the precast carrier 120 is placed. The mortar bed is preferably formed from concrete smoothing. In preferred embodiments, the wall supports 1012 are incorporated into the existing building wall 1010 as pockets or recesses. In particular, to form the wall support 1012, a pocket is chiseled into the existing building wall 1010, a mortar bed is prepared in the pocket to form a bearing surface 1014, and the prefabricated beam 120 is placed. The first and second wall supports 1012.1, 1012.2 are designed in such a way that the first and second support surfaces 1014.1, 1014.2 lie in a horizontal support plane HAE. All of the wall supports 1012 associated with the concrete cover 100 are particularly preferably designed in such a way that all of the support surfaces 1014 lie in the horizontal support plane HAE. The lateral end of the in-situ concrete slab 160 is visible on an inside of the outer wall 1018 . When producing the in-situ concrete slab 160, the building wall 1010, and in this case the outer wall 1018, forms the lateral boundary of the concrete mass. Advantageously, an edge insulating strip 172 can be introduced between the in-situ concrete slab 160 and the building wall 1010 , which in particular allows the in-situ concrete slab 160 to expand in relation to the building wall 1010 . The edge insulation strip 172 can in particular be formed as a mineral insulation strip or plastic strip or the like. The concrete cover preferably terminates surrounding the building wall 1010, that is to say it rests essentially continuously on the building wall 1010 along its horizontal circumference, optionally with an edge insulating strip 172 in between. In other embodiments, however, interruptions are possible, for example for a staircase or other openings or recesses. The precast girder 120 advantageously has a number of threaded sleeves 174 embedded in concrete, to which transport anchors (not shown here) can be temporarily attached in order to transport the precast girder 120 to its installation site. In particular, a crane and/or a hoist 1092, such as a block and tackle, can be used for this purpose. A length L of the prefabricated carrier 120 is dimensioned such that it can span a clear width LW and also rests sufficiently on the bearing surface 1014 . The clear width LW depends on the type of building and can, for example, assume values between 2 m and 12 m, in particular between 4 m and 8 m.

The precast girders 120 have a girder reinforcement 122, which is 1 and further in detail in 3 is visible in cross section. In the present case, the carrier reinforcement 122 is designed as a steel carrier reinforcement 136 . In other embodiments, the carrier reinforcement 122 can be designed differently, for example as a fiber carrier reinforcement 137 with carbon and/or glass fibers (not shown here). The girder reinforcement 122 of a precast girder 120 in the present case comprises six longitudinal rods 129 running parallel to a beam axis A and brackets 131 arranged perpendicularly to the longitudinal rods 129, two of which, namely an inner bracket 132 and an outer bracket 133, are visible in this view. The longitudinal rods 129 are attached to the brackets 131 at their respective contact points in a manner known to those skilled in the art, in particular welded, so that a self-supporting structure for forming the carrier reinforcement 122 is created. Four of the longitudinal bars 129 are arranged within a concrete segment 130 of the reinforced concrete girder 120, and two of the longitudinal bars 129 are arranged outside of the concrete segment 130, above the top side of the precast girder 127 or the formwork surface 150, in such a way that they run in the area of the in-situ concrete slab 160 and connect firmly to the in-situ concrete slab 160 after it has cured. The part of the girder reinforcement 122 lying outside the concrete segment 130 forms a connection section 122A. The portion of the beam reinforcement 122 lying within the concrete segment 130 forms a base portion 122B. The precast girder 120 is preferably prefabricated with the concrete segment 130 and the internal girder reinforcement 122 protruding on the top side 127 of the precast girder. The precast girder 120 has a girder width B in a horizontal direction H. The concrete segment 130 of the precast girder 120 has a girder thickness S in a vertical direction V. The in-situ concrete slab 160 has a thickness D in the vertical direction V. In particular, the girder strength S and the strength D result in the entire extension or height of the concrete cover 100 in the vertical direction V. On the precast girder upper side 127 there is advantageously a upper surface structure 198 is applied, here in the form of a rough joint, in order to improve the connection of the precast girder 120 to the in-situ concrete slab 160.

The in-situ concrete slab 160 has a slab reinforcement 164 . In the present case, the plate reinforcement 164 is formed as a steel plate reinforcement 165 with welded steel mesh with steel rods fastened to one another crosswise. Nevertheless, other steel plate reinforcements 165 are possible, for example with individual steel rods, preferably arranged crosswise to one another on the formwork surface 150, which are firmly connected to the concrete matrix in the in-situ concrete slab 160 when curing. Such steel rods can advantageously be transported through an opening in the building 1000, in particular into the floor above the concrete ceiling to be produced. In other embodiments, the plate reinforcement 164 can be designed differently, for example as a fiber plate reinforcement 167 with carbon and/or glass fibers (not shown here). Before the in-situ concrete slab 160 is cast in concrete, the slab reinforcement 164 is arranged on the formwork surface 150, preferably in such a way that the slab reinforcement 164 rests on the upper longitudinal bars 129, as shown here.

The carrier reinforcement 122 and the slab reinforcement 164 are advantageously arranged in the concrete in such a way that fire resistance class F90A according to DIN 4102 is met. In particular, minimum center distances AM are observed, which are specified in 1 are shown schematically. For details, refer to DIN 4102, with regard to the minimum center distances AM, in particular to DIN 4102-4:2016-05, Table 5.13, line 1.1 for the prefabricated beams (designated there as a or a _sd ) and to Table 5.13, line 2.1 or 2.2 for the supporting and field reinforcement of the in-situ concrete slab (denoted there as a ₀ or a ). Other possible conditions for meeting fire resistance class F90A are also advantageously met.

In particular, the thickness D of the in-situ concrete slab corresponds to a minimum thickness DM according to DIN 4102 and is preferably 100 mm according to DIN 4102-4:2016-05, table 5.12, line 3 (the minimum thickness is denoted by h there).

4 shows a preferred embodiment of a method according to the concept of the invention.

In a first step, measurements are taken 210 of the existing ceiling 1040, in particular the position of the existing ceiling supports 1042. The existing ceiling 1040 is preferably an upper existing ceiling 1050 between the upper full floor 1096 and attic 1060 of the building 1000, or a lower existing ceiling 1052 between a basement 1092 and a lower full floor 1094 of building 1000.

In a second step, the position of the prefabricated beams 120 is planned 220, taking into account the existing position of the existing ceiling beams 1042 and, if necessary, other boundary conditions such as concentrated loads from the roof construction, existing chimneys, etc.

In a third step, the construction of the concrete ceiling 100 is statically dimensioned 230, in particular with the precast girder 120, and the formwork and reinforcement plans are preferably created 232. The precast girders 120 are preferably dimensioned in such a way that intermediate supports for the precast girders are not required even during construction.

In a fourth step, the prefabricated beams 120 are produced 240 in the form of reinforced concrete beams 121, in particular outside the building 1000 in a concrete plant.

In a fifth step, the existing ceiling support 1042 or other components of the existing ceiling 1040 and/or the building 1000 are checked 250, in particular for biotic damage.

Depending on the inspection 250, if necessary, the existing ceiling supports 1042 or other components of the existing ceiling 1040 or the building 1000 are renovated 252.

In a sixth step, the wall supports 1012 are produced 260 in the building wall 1010, preferably with a support surface 1014 made of smooth concrete screed in the form of a mortar bed. The wall supports 1012 are preferably produced taking into account the height levelling, to ensure a horizontal alignment of the prefabricated girders 120 in a horizontal support plane HAE.

In a seventh step, if necessary, a rail system 1090 is installed 270 with a hoist 1092 in the floor above the existing ceiling 1040, in particular the attic 1060. The rail system 1090 is preferably that can have one or more parallel rails, horizontal and perpendicular to arranged to run along the existing floor girder 1042 in order to be able to move the prefabricated part girders 120, which are respectively attached to the hoist 1092 for the purpose of transport, to their position to be fastened between the respective existing floor girder 1042.

In an eighth step, if required, an opening 1072 is produced 280 in the building 1000, especially in the roof 1070, for lifting the precast beam 120 by a crane or similar transport device. Advantageously, the precast beams 120 can first be transported by a crane or similar transport device through an opening 1072 in the building 1000 to the floor above the existing ceiling 1040 before they are attached to the hoist 1092 from there.

In a ninth step, the precast girders 120 are provided 290, which were preferably produced outside the building, in particular in a concrete plant, and the precast girders are transported to the floor above the existing ceiling, in particular the attic, preferably by means of a crane or similar suitable means transport device. The at least one precast girder 120 and/or a concrete pump hose is preferably passed 292 through the opening 1072.

In a tenth step, the precast girders 120 are distributed 292 via the rail system 1090 and the hoist 1092 to their respective installation position next to the existing ceiling girder 1042, and in an eleventh step the precast girders 120 are placed 310 in two wall supports 1012 of the building wall 1010.

In a twelfth step, insulation 190 is installed 314, in particular cavity insulation 192. The provision of insulation 190 improves the insulation and separation of the concrete ceiling 100 from the existing ceiling 1040, which improves the building 1000, in particular with regard to soundproofing and thermal insulation. Cavity insulation 192 is preferably mineral insulation mats.

In a thirteenth step, the formwork panels 140 are arranged in a stationary manner in relation to the precast girders 120, preferably by placing each formwork panel 140 in a support fold 124 of two adjacent precast girders 120. In the case of the two outer precast girders 120, the formwork panel 140 is preferably placed on its one side is inserted into a supporting fold 124 of the outer prefabricated girder 120, and on its other side is fastened to the building wall 1010, preferably placed on this or placed on a pocket chiseled into the building wall 1010.

In a fourteenth step, a plate reinforcement 164 is arranged 324 in the form of reinforcing steel above the formwork surface 150 formed by the precast girders 120 and the formwork panels 140. The plate reinforcement 164 preferably comprises steel rods which are arranged crosswise on the formwork surface 150.

In a fifteenth step, an in-situ concrete slab 160 is cast in concrete 330 onto the formwork surface 150. Recesses 168 are optionally provided, which can be introduced into the in-situ concrete slab 160 by arranging special formwork elements 148. After the in-situ concrete slab 160 has hardened, these formwork elements 148 can be removed, and lines can be routed through the resulting recesses 168 or line guides 169 . Concreting 330 includes in particular curing 332 of the in-situ concrete slab 160.

After the in-situ concrete slab 160 has hardened, a sealing strip 170 is applied 340 if necessary in a sixteenth step. This is particularly advantageous if the floor above the existing ceiling 1040 or the concrete ceiling 100 does not offer any weather protection, for example due to a temporary removal of the roof 1070 an attic 1060. Such a sealing sheet 170 can be formed, for example, by bitumen or similar material known to those skilled in the art.

In a seventeenth step, the floor located above the concrete ceiling 100, in particular the top floor 1060, is renovated or rebuilt, preferably including applying 350 a floor structure 160 to the in-situ concrete slab 160. In this step, the roof structure can advantageously be renovated or rebuilt.

It should be understood that the here in 4 illustrated method represents a preferred embodiment of the method according to the concept of the invention. Nevertheless, it is possible within the scope of the invention to use individual, in particular the 4 dotted lines to omit or add steps, or where technically sensible and possible to change the order of individual steps.

5 shows another preferred embodiment of a ceiling system 600 with a concrete ceiling 100 according to the concept of the invention. The ceiling system 600 shown here differs from that in 1 shown ceiling system 600 to the effect that the existing ceiling 1040 is designed as a steel block existing ceiling 1058. Correspondingly, the existing ceiling beams 1042 are designed as steel brick existing ceiling beams 1045 in the form of double T-beams. The existing steel stone ceiling 1058 has a ceiling paneling 1027 arranged between the existing steel stone floor supports 1045, presently in the form of a brick ceiling. the steel stone Existing ceiling 1058 has a fill 1022, which is formed from slag sand and rests on the ceiling infill 1027. The existing steel block ceiling 1058, analogous to that in 1 shown embodiment, an existing suspended ceiling 1024. In other embodiments, the existing sub-ceiling 1024 may consist of or include a ceiling plaster.

6 shows to illustrate the concept of the invention a building 1000 with different existing ceilings 1040 and possible attachment locations of a concrete ceiling 100 to form a ceiling system 600. It should be understood that the building 1000 as an example of an old residential building is a preferred application for the method according to the concept of Invention is suitable. Nevertheless, the concept of the invention is not limited to this, but can rather be applied to any other type of building with an existing ceiling.

The building 1000 has a basement 1092, a lower full floor 1094, an upper full floor 1096 and an attic 1060 with a roof 1070, existing ceilings 1040 being present between each of the floors mentioned. The building 1000 has a building wall 1010, of which only the outer wall 1018 is shown here for a better overview. An upper existing ceiling 1050, ie the existing ceiling 1040 between the attic 1060 and the upper full floor 1096, is presently designed as a wooden beam existing ceiling 1056. The upper existing ceiling 1050 has a number of existing ceiling supports 1042 in the form of wooden existing ceiling supports 1043 . In the present case, a concrete ceiling 100 is built into the building 1000 on top of the existing ceiling 1040 in the form of the upper existing ceiling 1050 using a method 300 according to the concept of the invention. The concrete ceiling 100 has a number of prefabricated girders 120 which are arranged between the existing wooden ceiling girders 1043 and fastened in wall supports 1012 in the building wall 1010 . During the production of the concrete ceiling 100, the precast girders 120 can preferably be reached as reinforced concrete beams 121 through an opening 1072 in the roof 1070, in particular by a crane, and then via a rail system 1090 with a hoist 1092 to their respective installation location between the existing wooden ceiling girders 1043 be transported. An existing skylight can preferably be used as the opening 1072 . The rail system 1090 is preferably installed temporarily for the production of the concrete ceiling 100 in the floor above, here the attic 1060.

Alternatively or additionally, a concrete ceiling 100 can also be produced on a lower existing ceiling 1052 between the basement floor 1092 and the lower full floor 1094 using a method according to the concept of the invention. In the present case, the lower existing ceiling 1052 is designed as a steel brick existing ceiling 1058. The existing ceiling supports 1042 are consequently designed as existing steel stone ceiling supports 1045 . The production of the concrete ceiling 100 takes place analogously to the upper existing ceiling 1050. In particular, the precast girders 120 are transported through an opening 1072 in the building wall 1010 to their installation site between the steel block existing ceiling girders 1045. In particular, existing door or window openings can be used as the opening 1072 .

In addition to the lower existing ceiling 1052 and the upper existing ceiling 1050, a concrete ceiling 100 can also be arranged on any other existing ceiling 1040 of a building 1000, for example on an intermediate existing ceiling 1054 shown here.

reference list

100

concrete ceiling

120

precast beam

121

reinforced concrete beam

122

beam reinforcement

122A

Connection section of the precast beam

122B

Base section of the precast beam

123

recording feature

124

bearing fold

125.1

first end section

125.2

second end section

126

Precast beam underside

127

Precast beam top

129

longitudinal bar

130

concrete segment

131

hanger

132

inner strap

133

outer bracket

136

steel beam reinforcement

137

fiber beam reinforcement

140

formwork panel

148

formwork element

150

formwork surface

160

in-situ concrete slab

164

plate reinforcement

165

steel plate reinforcement

166

upper side of the plate

167

fiber slab reinforcement

168

recess

169

cable bushing

170

waterproofing membrane

172

edge insulation strips

180

floor construction

182

impact sound insulation

184

screed

186

floor covering

190

insulation

192

cavity insulation

196

cavity

198

surface texture

210

Taking measurements of the existing ceiling

220

Plan the position of the precast beams

230

Static dimensioning of the construction of the concrete floor

232

Creation of formwork and reinforcement plans

240

Manufacture of the prefabricated beams

250

Checking the existing ceiling supports

252

Renovation of the existing ceiling supports

260

Manufacture of the wall supports

270

Installing a rail system with a hoist

280

Creating an opening in the building

290

Provision of the prefabricated beams

292

Distributing the prefabricated beams to their respective installation position

300

Proceedings

310

Fastening the precast beams to the building wall

314

Installing insulation

320

stationary arrangement of the formwork panels

324

Placing a slab reinforcement on the formwork surface

330

Concreting the in-situ concrete slab

332

curing of the in-situ concrete slab

340

Application of a waterproofing membrane

350

Application of a floor structure

600

ceiling system

1000

Building

1010

building wall

1012

wall support

1012.1

first wall support

1012.2

second wall support

1014

bearing surface

1014.1

first bearing surface

1014.2

second bearing surface

1016

inner wall

1018

outer wall

1022

bulk

1024

Existing false ceiling

1026

false bottom

1028

ceiling infill

1040

existing ceiling

1042

Existing ceiling beam

1043

Existing wood ceiling support

1044

stock carrier top

1045

Steel stone floor beams

1046

Inventory carrier bottom

1048

bar intermediate zone

1050

upper inventory ceiling

1052

lower inventory ceiling

1054

Inter-stock ceiling

1056

Existing wooden beam ceiling

1058

steel brick floor

1060

attic

1070

Roof

1072

opening

1090

rail system

1092

basement

1094

lower mezzanine

1096

upper floor

A

beam axis

AWAY

bar spacing

AT THE

minimum wheelbase

AT

carrier spacing

B

Girder width of the precast girder in horizontal direction

B.A

ceiling clearance

D

thickness of the in-situ concrete slab

H

horizontal direction

HAE

horizontal support plane

L

Length of the precast beam

Lw

Clear expanse

S

Girder strength of the precast girder in the vertical direction

SU

Underside of the in-situ concrete slab

V

vertical direction

UV

vertical overlap

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 606522 C [0006]

Claims (9)

Method (300) for producing a concrete ceiling (100) for a building (1000) with an existing ceiling (1040), the existing ceiling (1040) having at least one existing ceiling support (1042), having the step: - placing (310) of at least one Precast girder (120) in a wall support (1012) of a building wall (1010) of the building (1000), the precast girder (120) being arranged at least partially next to the existing ceiling girder (1042), characterized by the steps: - Stationary arrangement (320) at least a formwork panel (140) in relation to the at least one precast girder (120), - concreting (330) an in-situ concrete slab (160) on a formwork surface (150 ). Method (300) according to claim 1 - the at least one precast girder (120) is fastened to the building wall (1010) in such a way that a precast girder underside (126) is arranged above an existing girder underside (1046) of the existing ceiling girder (1042). Method (300) according to claim 1 or 2 , wherein - the at least one precast girder (120) is fastened to the building wall (1100) and/or the at least one formwork panel (140) is arranged stationary in relation to the at least one precast girder (120) in such a way that the in-situ concrete slab (160) and the formwork panel (140) does not touch the at least one existing floor support (1042). Ceiling system (600) for a building (1000) consisting of an existing ceiling (1040) and a concrete ceiling (100), the existing ceiling (1040) having at least one existing ceiling beam (1042), and the concrete ceiling (100) having: - at least one prefabricated beam (120), which can be or is connected to a building wall (1010) of the building (1000) in a stationary manner, is preferably placed on or in a wall support (1012) in the building wall (1010), with the precast girder (120) being at least partially next to the existing floor girder (1042), characterized by - at least one formwork panel (140) arranged in a stationary manner in relation to the at least one precast girder (120), and - an in-situ concrete slab (160) which is connected to the at least one precast girder (120) in a resting manner and on an underside (SU) facing the existing ceiling (1040) by a structure formed by the at least one precast beam (120) and/or the at least one formwork panel (140). te formwork surface (150) is limited. Ceiling system (600) according to claim 4 , characterized in that - the at least one precast girder (120) has a concrete segment (130) and a girder reinforcement (122), the girder reinforcement (122) having a connecting section (122A) protruding from the concrete segment (130), wherein - the in-situ concrete slab (160) completely encloses the connecting section (122A). Ceiling system (600) according to claim 4 or 5 , characterized in that - the at least one precast girder (120) and/or the at least one formwork panel (140) do not touch the at least one existing slab girder (1042). Ceiling system (600) according to one of Claims 4 until 6 , characterized in that - the concrete cover (100) corresponds to fire resistance class F90A in accordance with DIN 4102, preferably in the in-situ concrete slab (160) and/or in the at least one precast girder (120) a minimum thickness (DM) and at least one minimum center distance (MA) in accordance with DIN 4102 are complied with. Concrete ceiling (100) for a building (1000) with an existing ceiling (1040), the existing ceiling (1040) having at least one existing ceiling beam (1042), the concrete ceiling (100) having: - at least one prefabricated beam (120) which has a The building wall (1010) of the building (1000) can be connected in a stationary manner, preferably can be placed on or in a wall support (1012) in the building wall ( 1010 ), with the precast girder (120) being arranged at least partially next to the existing ceiling girder (1042). by - at least one formwork panel (140) which is stationary in relation to the at least one precast beam (120), and - an in-situ concrete panel (160) which is connected to the at least one precast beam (120) and rests on one facing the existing ceiling (1040). Underside (SU) is delimited by a formwork surface (150) formed by the at least one precast girder (120) and/or the at least one formwork panel (140). Building (1000) having a concrete ceiling (100) produced by a method according to the Claims 1 until 3 and/or a ceiling system according to any one of Claims 4 until 7 and/or a concrete floor (100) according to claim 8 .

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