EP3662116A1

EP3662116A1 - Method for producing a ceiling element and ceiling formwork

Info

Publication number: EP3662116A1
Application number: EP18745964.9A
Authority: EP
Inventors: Christoph BARON
Original assignee: Doka GmbH
Current assignee: Doka GmbH
Priority date: 2017-08-02
Filing date: 2018-08-02
Publication date: 2020-06-10
Anticipated expiration: 2038-08-02
Also published as: ES2871017T3; US20200232213A1; EP3662116B1; US11149434B2; CA3068904C; WO2019025513A1; CA3068904A1; CN209040543U; EP3438365A1

Abstract

The invention relates to a ceiling formwork and a method for producing a ceiling element (2), comprising the following steps: - arranging two ceiling supports (3) on a floor (23), - connecting a first end region (4) of a ceiling formwork frame (5) to the two ceiling supports (3) such that the ceiling formwork frame (5) is arranged in an intermediate position inclined downward from the first end region (4) in the direction of a second end region (7), - connecting a lost ceiling plate (8) to the ceiling formwork frame (5) arranged in the intermediate position, - pivoting the second end region (4) of the ceiling formwork frame (5) up, together with the lost ceiling plate (8), - supporting the second end region (7) of the ceiling formwork frame (5) that has been pivoted up by at least one additional ceiling support (6) and - casting the ceiling element (2), together with the lost ceiling plate (8), on the ceiling formwork frame (5).

Description

METHOD FOR PRODUCING A CEILING ELEMENT AND CEILING PANEL

The invention relates to a method for producing a

Ceiling element.

Furthermore, the invention relates to a slab formwork for producing a ceiling element.

From WO 2016/177979 Al such a slab formwork for the production of ceiling or floor slabs is already known, in which a lost formwork panel is used. In this prior art, a number of ceiling props are first constructed on which longitudinal and transverse beams are supported. On this structure, the lost formwork panels are laid with which the Deckenbzw. Ground disc is poured. The lost formwork panels form a lower layer of the finished ceiling or floor panel. The use of lost formwork panels brings numerous

Advantages, such as the higher quality of the surface, the simplification of rework on the ceiling and the

count less effort when stripping. However, a disadvantage is the handling of the lost formwork panels in the prior art, which is associated with a certain security risk.

In the prior art also different frame structures for remote uses, not in lost formwork, are known.

EP 1 384 837 A1 discloses a frame construction which is disclosed in US Pat

Mounted supports can be suspended by stand and placed in an inclined intermediate position during construction.

FR 2 957 957 A1 discloses a frame construction with stanchions, a frame and shuttering panels. When building the frame is initially unilaterally at the uprights 55 and then flipped up.

EP 1 375 781 A1 likewise shows a frame construction consisting of an outer frame part and one opposite the outer one

Frame part swiveling inner frame part.

Accordingly, the object of the present invention is to alleviate or remedy at least individual disadvantages of the prior art. The invention is particularly aimed at a Specify a method and a slab formwork, with which or with which the use of lost ceiling panels is made simple and secure.

This object is achieved by a method according to claim 1 and a slab formwork according to claim 10. preferred

Embodiments are given in the dependent claims.

In the method according to the invention, at least the following steps are carried out:

Arranging two floor props on a floor,

- Connecting a first end portion of a slab formwork frame with the two floor props such that the

Ceiling formwork frame in one of the first end area in

Direction of a second end region inclined downwards

Intermediate position is arranged

- Connect a lost ceiling tile with the one in the

Intermediate position arranged ceiling formwork frame,

Pivoting up of the second end region of the

Slab formwork frame including lost ceiling slab,

- supporting the second end of the swung up

Ceiling formwork frame with at least one other

Ceiling support and

- Pouring the ceiling element together with lost ceiling slab on the slab formwork frame.

Advantageously, so the casting of the ceiling element from the ground can be prepared. The lost ceiling tile will be on the

Ceiling formwork frame arranged while the slab formwork frame is arranged in the intermediate position inclined from the first in the direction of the second end portion to the ground. In the intermediate position, the slab formwork frame is easily accessible from the ground to attach the lost ceiling slab to the slab formwork frame. In the intermediate position, the ceiling formwork frame is preferably at an angle of at least 10 degrees, in particular of at least 20 degrees, preferably of at least 30 degrees, to a horizontal plane through the connection points of the first end region of the

Ceiling formwork frame with the ceiling supports arranged. Only then is the second end region of the slab formwork framework, together with the lost ceiling slab disposed thereon, close to the ground pivoted above and finally supported by the at least one other ceiling support, so that the ceiling formwork frame with the lost ceiling plate in the (especially horizontal)

Operating position is arranged. This has the significant advantage that the construction of the slab formwork from the ground initially a closed work surface at the top of the lost ceiling slab is created, which must be entered only then by workers to further work on the lost

To perform ceiling slab, for example, to provide reinforcements or create lines. Accordingly, the occupational safety can be significantly increased. In contrast, the lost ceiling panels in the prior art had to be arranged on already located in horizontal position of use formwork beams. However, this presupposed that the workers had to go to the formwork beams to arrange the lost ceiling panels from above on the slab formwork elements. Meanwhile, however, some even large openings or gaps were present in the formwork structure, which the work safety

could affect. In addition, overhangs of the panels beyond the edge of the formwork structure often resulted

Danger potential for the workers. By the

Projections could also damage the plates themselves.

In contrast, the present method allows a safe and simple manufacture of ceiling elements with at least one lost, i. in the ceiling element remaining, ceiling tile. The ceiling element is made by supplying concrete to the lost ceiling slab. This is a ceiling element (or

according to a bottom element) obtained, which may advantageously have a finished bottom. Accordingly, any reworking can be reduced. Furthermore, the stripping for the preparation of the next casting process can be facilitated. The cleaning of the formwork can be simplified.

For the purposes of this disclosure, the location and

Directional indications, such as "top", "bottom", "horizontal", "vertical", to a horizontal state of use of the slab formwork frame for casting the ceiling element. Of course, the

Ceiling formwork frame but also inclined to the horizontal

be arranged to produce a sloping ceiling element. The lost ceiling plate is preferably a ... plate used. Preferably, the lost ceiling panel is made of a material of the group consisting of gypsum, wood, wood composite, plastic, steel, aluminum and / or a combination thereof. The lost ceiling panel may have reinforcements, such as glass fibers, or a reinforcement.

In a preferred application, the lost ceiling slab has markings on the upper side (i.e., on the side facing away from the floor) which preferably illustrate a piping plan for the ceiling element to prevent the installation of concrete prior to concreting

Lines, such as electrical wiring or piping, to facilitate the lost ceiling tile.

According to a preferred embodiment, the lost ceiling slab is inserted into a holder of the slab formwork frame for connection to the slab formwork frame. In this embodiment, the lost ceiling panel can be connected without tools in the intermediate position with the holder of the slab formwork frame. The holder preferably has a bearing surface for placing the lost ceiling plate. The support surface preferably has one each

Section along two transverse and two longitudinal sides of a rectangular in plan view ceiling formwork frame. It is particularly preferred if the support surface extends continuously along the two transverse and the two longitudinal sides of the slab formwork frame. Accordingly, a peripheral support for the lost ceiling plate is preferably provided. Advantageously, the lost ceiling panel is in the connected to the slab formwork frame

State not on the longitudinal and transverse sides of the

Ceiling formwork frame. Due to the lack of overhangs, the safety when installing and removing and the quality of the cast ceiling element is increased.

In addition, the holder preferably has a holding web which projects upwards from the supporting surface. Preferably, the retaining web each has a portion along the two transverse and two longitudinal sides of the slab formwork frame. It is particularly preferred if the holding web is continuous along the two transverse and the two

Long sides of the slab formwork frame extends. The wall thickness of the lost ceiling panel is substantially equal to the height (ie the vertical extent) of the retaining web, so that the top (ie the concrete facing side) of the lost ceiling plate i substantially flush with the top of the retaining web.

Preferably, the lost ceiling plate is arranged loosely in the holder of the ceiling formwork frame. Due to the dead weight of the lost ceiling plate, a secure arrangement on the

Ceiling formwork frame are guaranteed.

In order to facilitate the construction of the slab formwork in preparation for pouring or concreting the ceiling element, it is advantageous if the slab formwork frame is held independently in the intermediate position, wherein the second end of the

Ceiling formwork frame together with lost ceiling plate is spaced from the ground. This means that the slab formwork frame can be positioned in the intermediate position without manual support of the second end region (and without setting the second end region on the ground) before the slab form frame is pivoted upwards over its second end region into the use position. For this purpose, the slab formwork frame may have support sections or support receptacles on opposite longitudinal sides, in which sections inclined in the horizontal direction

In the intermediate position of the slab formwork frame corresponding pins or lugs are received on heads of the floor props or

are held.

In an alternative embodiment, especially at low

Room heights, the second end of the slab formwork frame can be placed in the intermediate position on the floor.

In order to accomplish the pivoting of the slab formwork frame including lost ceiling slab from the ground, it is advantageous if the second end of the slab formwork frame together

lost ceiling panel with a mounting rod from the

Intermediate position is swung up. The mounting bar may have an engagement member at a free end engageable with a transverse frame member at the second end portion to then engage the slab formwork frame with the aid of

Shift assembly rod upwards. To ensure safety when working on the lost ceiling plate before pouring, a Aushubsicherung between the ceiling supports and the slab formwork frame is preferably provided with which the slab formwork frame in the swung

Position of the slab formwork frame against lifting off the

Ceiling supports is secured. A corresponding Aushubsicherung can between the other floor props and the

Ceiling formwork frame be provided. The Aushubsicherung preferably has a retaining lug on the ceiling support (or alternatively on the slab formwork frame) and a retaining flange on

Ceiling formwork frame (or in the alternative version of the ceiling support), which when pivoting the

Ceiling formwork frame are engaged with each other so that a relative vertical movement between the retaining lug and the retaining flange is locked.

For load absorption during casting of the ceiling element, it is advantageous if the slab formwork frame has two longitudinal sides and two transverse sides, wherein at least one transverse rib extending essentially in the direction of the transverse sides is provided. Preferably, a plurality of spaced apart in the longitudinal direction of the slab formwork frame, in particular parallel to each other

Transverse ribs or cross member provided. Preferably, the

Ceiling formwork frame in the longitudinal direction (i.e., in the direction of

Long sides) elongated.

For the production of large-area ceiling elements, in a preferred embodiment, at least two slab formwork frames each with a lost ceiling slab in the swung-up

Position arranged side by side before the ceiling element is poured together with the lost ceiling panels on the slab formwork frame. Preferably, two adjacent longitudinal or transverse sides of two slab formwork frames can be supported on two common slab props.

In a particularly preferred embodiment, a gap between facing side surfaces of the lost

Ceiling panels filled after pouring the ceiling element with a filler. The gap is formed in particular as a negative mold adjacent holding webs of the ceiling formwork frame. By Backfilling the gap after concreting can be done in the

Substantially flat underside of the ceiling element can be achieved. It is particularly advantageous that the reworking of the

Ceiling element can be done very easily and quickly. In the production of ceiling elements with reusable

Shuttering, however, it is often required, supernatant

Grind concrete crawlers or concrete burrs (i.e., excess concrete material) in the area of adjacent formwork panels to produce a flat underside. In contrast, the gap in the method described above with much less effort with filling material, such as putty, are filled. When concreting a Betongrat or a concrete flag in the

Space between the lost ceiling tiles arises, so it can be hidden within the filling.

In a further preferred embodiment, prior to casting, a sealing tape is disposed along adjacent edge portions on the tops of the lost ceiling panels. The sealing tape

allows in particular to cover the gaps between the lost ceiling panels due to tolerances and the

To prevent fouling of the lower ceiling surface. Depending on the design, a gap between the lost ceiling slab and the slab formwork frame can also be closed. Furthermore, the pivoting of the frame can be facilitated.

Preferably, the slab formwork frame along its

Longitudinal sides and / or transverse sides an elevation, i. a curvature upwards, up. The elevation may be, for example, several millimeters to centimeters. As a result, the lost ceiling plate in the use position in a curved upward state, the plate preferably on bearing surfaces in

Ceiling formwork frame is arranged for the lost ceiling tile. This allows the formation of a slight curvature in the cast or resulting ceiling, which can be compensated statically caused subsidence of the finished ceiling in a simple manner without any action. This elevation allows a significant weight reduction in the dimensioning of the Ceiling formwork frame in relation to the flatness of the finished

Ceiling element.

After curing of the ceiling element of the slab formwork frame, the floor props or at least one more

Ceiling support removed or transferred to a tilted rest position. After that, the ceiling formwork frame in the

Intermediate position can be arranged. Then the

Ceiling formwork frames are detached and removed from the ceiling supports remaining in the support position.

The slab formwork for producing the ceiling element has at least

two ceiling supports for supporting a first end portion of a slab formwork frame such that the slab formwork frame in one from the first end portion toward a second

Endbereich downwardly inclined intermediate position can be arranged,

- Two more floor supports for supporting the second

End of the slab formwork frame in one

raised position of the slab formwork frame and

- a lost ceiling slab on the slab formwork frame. Of course, the slab formwork can depending on the application more slab formwork frames, props and lost

Have ceiling panels.

The invention will be described below with reference to preferred

Embodiments further explained.

Fig. 1 shows a view of a slab formwork with four

Ceiling formwork frame including lost ceiling tiles in their horizontal use or insertion position.

Fig. 2 shows one of the slab formwork frames in one

Intermediate position in the construction of the slab formwork of FIG. 1, wherein the first end portion of the slab formwork frame with two

Ceiling supports, while the second,

opposite end portion of the ceiling formwork frame is located near the ground.

FIG. 3 shows the slab formwork frame according to FIG

Insert the lost slab formwork. Fig. 4 shows the slab formwork frame according to FIG. 1 to 3 in the swung-up and supported on a total of four props use position.

Fig. 5 shows a variant embodiment in which the second end portion of the slab formwork frame in the raised position is initially supported only at one corner with the first of the two other ceiling support to first bring a neighboring ceiling slab frame in the same position and then the second of the two to use additional floor supports for supporting adjacent corner area of the slab formwork frame.

Fig. 6 shows a view of the slab formwork frame without lost ceiling slab.

Fig. 7 shows a view of the slab formwork frame with lost ceiling slab.

Fig. 8, 9 show side views of the slab formwork frame with lost ceiling slab.

FIG. 10 is a sectional view taken along the line X-X in FIG. 1; FIG.

Fig. 11 shows the ceiling element after the casting process, wherein a gap between two lost ceiling panels has been filled with filler.

Fig. 12 shows a view corresponding to Fig. 1 of an alternative embodiment of the slab formwork, in which the adjoining edge regions of the lost ceiling slabs are provided with sealing strips prior to casting.

FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 12. FIG.

FIG. 14 shows a section of the ceiling element which is obtained when using the slab formwork of FIGS. 12, 13.

Fig. 1 shows a slab formwork 1 for concreting a

Ceiling element 2 (see Fig. 12, 14). The slab formwork 1 has two ceiling supports 3 for supporting a first (longitudinal) end region 4 of a slab formwork frame 5 and two further floor supports 6 for supporting a second end region 7 of the Slab formwork frame 5 on. On the slab formwork frame 5 a lost ceiling slab 8 is arranged, which thus remains after concreting in the slab formwork element 2. Accordingly, the ceiling plate 8 is formed as a lost formwork.

In the illustrated embodiment, the slab formwork 1 on three more slab formwork frame 9, on which more lost ceiling panels 10 are arranged. The other slab formwork frame together with further lost ceiling panels 10 are supported on additional ceiling supports 11. Preference is given to the others

Ceiling formwork frame 9 corresponding to the slab formwork frame 5 and the other lost ceiling panels 10 formed according to the lost ceiling plate 8. The floor props 3, more

Ceiling supports 6 and additional ceiling supports 11 may also be identical.

The structure of the slab formwork 1 is apparent from FIGS. 2 to 5.

In the first step, the two floor props 3 are supported on a floor 12 (see Fig. 1), which, for example, by the

underlying projectile of a building to be erected using the slab formwork 1 is formed. Such ceiling supports 3 are well known in the art. In the shown

According to the embodiment, each ceiling support 3 has an upper ceiling support part 13 and a lower ceiling support part 14 which are vertically adjustable against each other by the height (i.e., the vertical extent) of the ceiling support 3 depending on the application

adjust. The ceiling support 3 has a locking device 15 for locking the upper ceiling support part 13 in different height positions relative to the lower ceiling support part 14. The locking device 15 may have a bracket 16, which can be inserted through corresponding, spaced apart in the vertical direction holding openings 17 of the upper ceiling support member 13. At the upper end of the ceiling support 3 is further a

Head portion 18 is provided, which is adapted for a detachable connection with the first end portion 4 of the slab formwork frame 5. In addition, a Aushubsicherung on the heads of the floor props 3, on which the slab formwork frame 5 is supported, be provided with which the slab formwork frame 5 in the pivoted position of the slab formwork frame 5 is secured against lifting from the ceiling supports 3.

As can be seen in particular from FIGS. 2 and 6, the

Ceiling formwork frame 5 in the embodiment shown in plan view rectangular with two opposite longitudinal sides 19 and two opposite transverse sides 20 formed. On the longitudinal sides 19 are longitudinal frame parts 21, provided on the transverse sides 20 transverse frame parts 22. In addition, the slab formwork frame 5 has a plurality of transverse ribs 23, which extend parallel to the transverse frame members 22 on the transverse sides 20 of the slab formwork frame 5.

After the arrangement of the floor props 3 in the vertical

Supporting position on the floor 12, the first end portion 4 of the slab formwork frame 5 is suspended in the head parts 18 of the floor props 3. In this case, the slab formwork frame 3 in a

arranged starting from the first end portion 4 to the second end portion 7 down towards inclined intermediate position. Depending on the design of the slab formwork frame 5 can be independently held in the intermediate position.

In the next step, cf. Fig. 3, the lost ceiling panel 8 is connected to the arranged in the intermediate position ceiling formwork frame 5. For this purpose, the lost ceiling plate 8 is inserted into a holder 25 of the ceiling formwork frame 5, which emerges in detail from Fig. 6, Fig. 10. The holder 25 has a support surface 26 for placing the lost ceiling plate 8 and a retaining web 27 for longitudinal and / or transverse side enclosure of the lost ceiling plate 8.

In the next step, the slab formwork frame 5 is swung together with the lost ceiling slab 8 by means of the mounting bar 24 in the horizontal position of use shown in FIG. The second end region 7 of the slab formwork frame 5 is supported by the two further floor props 6. For this purpose, the head parts 18 of the further floor props 6 are connected to the second end area 7 of the slab formwork frame 5.

In Fig. 5 is another intermediate position of the

Ceiling formwork frame 5 shown, which is preferably taken when at least two slab formwork frame 5 side by side be positioned (as shown in Fig. 1). In this embodiment, the second end portion 7 of the slab formwork frame 5 is first supported in the swung-up position only with the first of the two other floor props 6 and preferably secured by means of the mounting rod 24. Thereafter, the adjacent further ceiling formwork frame 9 is arranged in the raised position. Finally, the second of the further ceiling supports 6 is connected to the free corner regions of the slab formwork frame 5 and to the further slab formwork frame 9.

In this way, the slab formwork 1 is constructed as shown in Fig. 1. In the position of use is finally the

Ceiling element 2 including the lost ceiling plate 8 (and depending on the design of a number of other ceiling tiles 10) poured. The ceiling element 2 therefore has an upper-side concrete layer 28, on the underside of which the lost ceiling panel 8 (as well as any further ceiling panels 10, cf. FIG. 11) is arranged. In order to ensure a permanent bond between the lost ceiling slab 8 and the concrete layer 28, the ceiling slab 8 preferably has a material that bonds itself to the concrete of the concrete layer 8 in the liquid state. Alternatively, the

Ceiling panel 8 has a roughened top or pits or bumps, e.g. Have noses, forming surface structures, by means of which the ceiling plate 8 is held with the concrete layer 28 by positive engagement.

When concreting a gap 29 between each other

facing side surfaces 30 of the lost ceiling panels 8, 10 formed. After casting the ceiling element 2, the interspace 29 can be filled up with a filling compound 31 (see Fig. 11 and Fig. 14). It is advantageous that a Betongrat 32 in the joint area of adjacent slab formwork frames 5, 9 can be hidden within the filling material 31, so that a complex grinding of the concrete bead 32, as in a reusable formwork with multiple abutting shuttering panels, can be omitted.

In Figs. 12 to 14 an alternative embodiment is shown, wherein below only the differences from

Embodiment of Fig. 1 to 11 will be explained. In this embodiment, at least one sealing strip 33 is merely adjacent to one another before the casting of the ceiling element 2

Edge regions 34 on the topsides 35 of the lost ceiling panels 8, 10 are arranged. The sealing tape 33 therefore bridges the

Gap 29.

Claims

Claims:

1. A method for producing a ceiling element (2) with the following steps:

Arranging two floor props (3) on a floor (23),

Connecting a first end region (4) of a

Slab formwork frame (5) with the two floor supports (3) such that the slab formwork frame (5) is arranged in an intermediate position inclined downwards from the first end area (4) in the direction of a second end area (7),

- Connect a lost ceiling plate (8) with the in the

Intermediate position arranged ceiling formwork frame (5),

Pivoting up of the second end region (4) of the

Slab formwork frame (5) including lost ceiling slab (8),

- Supporting the second end portion (7) of the swung

Ceiling formwork frame (5) with at least one other

Ceiling support (6) and

- Casting the ceiling element (2) together with lost ceiling plate (8) on the slab formwork frame (5).

2. The method according to claim 1, characterized in that the lost ceiling plate (8) for connecting to the

Ceiling formwork frame (5) in a holder (25) of

Ceiling formwork frame (5) is inserted.

3. The method according to claim 1 or 2, characterized in that the slab formwork frame (25) is held independently in the intermediate position, wherein the second end region (7) of the

Ceiling formwork frame (5) together with lost ceiling plate (8) from the bottom (12) is spaced.

4. The method according to any one of claims 1 to 3, characterized

characterized in that the second end region (7) of the

Ceiling formwork frame together with lost ceiling plate (8) with an assembly rod (24) is pivoted from the intermediate position.

5. The method according to any one of claims 1 to 4, characterized

characterized in that a Aushubsicherung between the ceiling supports (3) and the slab formwork frame (5) is provided, with which the slab formwork frame (5) in the raised position of Ceiling formwork frame (5) is secured against lifting from the ceiling supports (3).

6. The method according to any one of claims 1 to 5, characterized

in that the slab formwork frame (6) has two longitudinal sides (19) and two transverse sides (20), wherein at least one transverse rib (23) extending essentially in the direction of the transverse sides is provided.

7. The method according to any one of claims 1 to 6, characterized

characterized in that at least two slab formwork frames (5, 9) each having a lost ceiling slab (8, 10) in the

pivoted position are arranged side by side before the ceiling element (2) together with the lost ceiling panels (8, 10) on the slab formwork frame (4, 9) is poured.

8. The method according to claim 7, characterized in that a gap (29) between mutually facing side surfaces (30) of the lost ceiling panels (8, 10) after casting the

Ceiling element (2) is filled with a filling compound (31).

9. The method according to claim 7 or 8, characterized in that prior to casting a sealing strip (33) along adjacent

Edge regions (34) on the tops (35) of the lost

Ceiling plates (8, 10) is arranged.

10. The method according to any one of claims 1 to 9, characterized

characterized in that after the curing of the ceiling element (2) of the slab formwork frame (5) is brought into the intermediate position.

11. The method according to any one of claims 6 to 10, characterized

in that the slab formwork frame (5) has an elevation along the longitudinal sides (19) and / or transverse sides (20).

12. slab formwork (1) for producing a ceiling element (2), comprising:

- Two ceiling supports (3) for supporting a first end portion (4) of a slab formwork frame (5) such that the

Slab formwork frame (5) can be arranged in an intermediate position inclined downwards from the first end region (4) in the direction of a second end region (7), - Two more ceiling supports (6) for supporting the second

End region (7) of the slab formwork frame (5) in a raised position of the slab formwork frame (5) and

- A lost ceiling plate (8) on the slab formwork frame (5).

13. slab formwork (1) according to claim 12, characterized in that the lost ceiling plate (8) for connection to the slab formwork frame (5) in the intermediate position in a holder (25) of the slab formwork frame (5) is inserted.

14. slab formwork (1) according to claim 13, characterized in that the holder (25) has a support surface (26) for placing the lost ceiling plate (8) and a holding web (27), wherein the holding web (27) of the support surface ( 26) protrudes upwards.

15. slab formwork (1) according to claim 14, characterized in that the holding web (27) each have a portion along the two transverse and two longitudinal sides of the slab formwork frame (5).

16. slab formwork (1) according to claim 15, characterized in that extending the retaining web (27) continuously along the two transverse and the two longitudinal sides of the slab formwork frame (5).

17. Ceiling formwork (1) according to any one of claims 14 to 16, characterized in that the wall thickness of the lost ceiling panel (8) substantially corresponds to the height of the retaining web (27), so that the top of the lost ceiling panel (8) is substantially flush with the top of the retaining web (27) closes.

18. slab formwork (1) according to one of claims 14 to 17, characterized in that the lost ceiling panel (8) is arranged loosely in the holder (27) of the slab formwork frame (5).