Ceiling formwork element

Abstract

Slab formwork element (2) for connection with a column head (4) of a formwork support (3), comprising: a frame (6) for a formwork panel (5), a locking element (10) on the frame (6) for engaging under a securing projection (11) on the support head (4) of the formwork support (3), characterized by the fact that the locking element (10) is connected to a spring element (12) so that the locking element (10) can be moved from a locking position to a release position against the spring force of the spring element (12).

Description

[0001] The invention relates to a ceiling formwork element for connection to a column head of a formwork support, comprising: a frame for a formwork panel, a locking element on the frame for engaging under a securing projection on the column head of the formwork prop.

[0002] Furthermore, the invention relates to a ceiling formwork comprising: a ceiling formwork element, and a formwork prop with a prop head.

[0003] Various designs of slab formwork are known in the prior art, in which slab formwork elements are supported on the heads of formwork props. By arranging them on the formwork props, the slab formwork element is secured horizontally. In such slab formwork, it is also known that the head of the formwork prop has an undercut, which engages with a corresponding locking device on the slab formwork element.

[0004] For example, DE 42 11 200 C2 shows a column head with hook strips into which a corresponding hook edge on a formwork panel element can be hooked.

[0005] This locking device secures the slab formwork element, once assembled, vertically to the column head of the formwork prop. This is referred to as anti-liftout protection, which ensures that the slab formwork element remains connected to the column head even when exposed to wind loads that may act on the slab formwork element from below. Since slab formwork elements are typically supported at their four corners by four formwork props, an intermediate situation can arise during the assembly of the slab formwork in which the slab formwork element rests on only three formwork heads. Even in this situation, the locking element ensures appropriate vertical positional stability.

[0006] However, the known anti-lift devices have significant disadvantages. If the device is integrated into the column head, it cannot be deactivated. This makes it impossible to remove a single slab formwork element from a bay of slab formwork elements or to install a single slab formwork element into a gap within such a bay of slab formwork elements. Generally, the slab formwork elements must be pivoted upwards into their intended position. Vertical installation or removal is not possible.

[0007] This problem can in principle be solved by using removable additional parts for excavation protection.

[0008] An example of this is shown in DE 4308607 A1, which addresses the problem that, with the prior art of DE 42 11 200 C2, when several formwork panel elements are arranged in their horizontal position, stripping can only begin at a specific point. DE 4308607 A1, in contrast, provides weight wings that pivot around a cylindrical pin, allowing the retaining edge of the formwork panel to be gripped. A disadvantage, however, is that the function of such weight or gravity wings can be impaired by dirt. Furthermore, this prior art is only designed for horizontal slab formwork, since the weight wings always pivot into the vertical position.

[0009] In general, the known designs pose a risk of misuse. Particularly serious consequences can occur if the anti-excavation device is not installed correctly or – in the case of removable anti-excavation devices – is forgotten altogether.

[0010] AT 409 648 Bis also discloses a different solution, in which a formwork support can be held to the column head with a snap spring. However, this design is susceptible to contamination and damage. Furthermore, it increases the complexity and weight of the column head.

[0011] Against this background, the present invention aims to alleviate or eliminate at least some of the disadvantages of the prior art. The object of the invention is preferably to create an excavation protection device for slab formwork that opens up more versatile application possibilities without neglecting safety aspects.

[0012] This object is achieved by a ceiling formwork element according to claim 1 and a ceiling formwork according to claim 16.

[0013] In the ceiling formwork element according to the invention, the locking element is connected to a spring element so that the locking element can be moved from a locking position to a release position against the spring force of the spring element.

[0014] The slab formwork according to the invention comprises a slab formwork element and a formwork prop with a prop head. The prop head has a locking projection, with the locking element engaging under the locking projection of the prop head in the locked position.

[0015] In the locked position, the locking element on the frame of the slab formwork element is designed to engage under the securing projection on the support head. This means that the locking element is arranged below the securing projection on the support head in such a way that the slab formwork element is blocked against vertically upward lifting. As in the prior art, the locking element in the locked position acts as a lift-out protection device, which prevents the slab formwork element from being lifted off the support head, in particular due to wind loads from below. According to the invention, the locking element can be elastically deflected against the spring force of the spring element in order to move the locking element from the locked position below the securing projection into the release position laterally next to the securing projection.Thus, the locking element can be deactivated by overcoming the spring force of the spring element, for example, to enable the slab formwork element to be lowered vertically onto the support head or raised vertically from the support head. Due to the elastic restoring forces of the spring element, the locking element returns to its original position when unloaded, which corresponds to the locked position when the slab formwork element is mounted on the formwork support. Thus, the locking element is preloaded towards the locked position by means of the spring element. This reduces incorrect operation. Furthermore, it prevents the locking element from inadvertently remaining in the release position. This advantageously expands the application possibilities of the slab formwork element without compromising safety.Furthermore, the design according to the invention is less susceptible to damage or contamination.

[0016] For the purposes of this disclosure, the location and direction specifications, such as "top," "bottom," "vertical," and "horizontal," refer to the intended use of the slab formwork, with the formwork prop positioned vertically on a horizontal base and the slab formwork element arranged horizontally in the concreting position. Of course, inclined slabs can also be constructed with the slab formwork, in which case the location and direction specifications must be transferred accordingly.

[0017] To achieve lateral mobility of the locking element between the locking and release positions, it is advantageous if the locking element can be pivoted from the locking to the release position about a preferably substantially horizontal pivot axis. This allows the locking element to be pivoted away from the locking position under the securing projection on the support head against the spring force, allowing, for example, the lifting of the slab formwork element. Furthermore, in the release position, the support can be removed or a slab formwork element can be inserted from above.

[0018] For a secure and stable connection to the securing projection on the prop head, it is advantageous if the locking element is provided on a lower edge area of ​​a longitudinal or transverse side part of the frame. By arranging the locking element on the lower edge area of ​​the side part, it can be ensured that the locking element is arranged below the securing projection of the prop head in the locked position, so that the intended anti-lifting protection, i.e. protection against the slab formwork element being accidentally lifted off the prop head of the formwork prop, is achieved. Depending on the design, the locking element can be located on a longitudinal or transverse side of the frame, whereby the longitudinal side refers to the longer side of the slab formwork element and the transverse side refers to the narrower side of the slab formwork element, which in conjunction with the formwork panel is preferably rectangular in plan view.

[0019] In a preferred embodiment, the blocking element, in the locked position, is preferably arranged substantially entirely beneath a retaining edge on the top side of the frame. The retaining edge supports an edge of the formwork panel on the underside and can protrude outward laterally beyond a longitudinal or transverse side part of the frame. Because the blocking element is covered on top by the retaining edge in the locked position, the blocking element is protected, in particular from falling objects and from contamination by concrete.

[0020] Preferably, the retaining edge has a drip edge on the outside of the underside, which further improves the protection of the blocking element.

[0021] Attaching the spring element to the inside of the frame's side panel provides protection against dirt, reducing functional impairment. This advantageously ensures the mobility of the locking element between the locked position (activated state) and the released position (deactivated state), even under the adverse conditions typical of construction sites.

[0022] With regard to a compact, lightweight and cost-effective design, a flat spring can be provided as the spring element, which is connected at one end to the frame and at the other end to the locking element. A spring plate, for example, can be provided as the flat spring. The flat spring is preferably connected to the frame via a fixed connection, in particular a riveted connection. Preferably, the flat spring is arranged essentially parallel to a side part of the frame when the locking element is in the locked position. This results in a particularly space-saving and protected arrangement. It is particularly advantageous if the flat spring does not protrude inwards beyond a lower edge of the frame when in the locked position.

[0023] In a further embodiment, a spring clip is provided as the spring element, which can be bent from a round wire, for example.

[0024] In a first preferred embodiment, the locking element protrudes outward from the side part of the frame in the locking position, in particular substantially in the longitudinal or transverse direction of the frame. Thus, in the locking position, the locking element protrudes laterally from the outer side of the frame, whereby the locking element is arranged below the securing projection on the support head in the locking position.

[0025] In order to protect the spring element inside the frame on the one hand and to enable the securing projection to engage underneath outside the frame on the other, the side part of the frame preferably has a through-opening through which the locking element projects outwards in the locked position. The through-opening preferably has the same cross-sectional geometry as the locking element. If, for example, a pin with a circular cross-section is provided as the locking element, a correspondingly circular through-opening can be provided on the side part of the frame. In the locked position, the locking element is preferably arranged in the through-opening on the side part with an essentially precise fit, but preferably with (slight) play.

[0026] Depending on the design, a pin, for example, can be provided as the locking element. The pin can have a circular cross-section. Furthermore, the pin can be tapered towards the front at the free end. However, the locking element can also have other shapes; for example, the locking element can be designed as a latch with a non-circular cross-section, in particular with a rectangular cross-section.

[0027] In a preferred embodiment, the locking element is fixedly connected to the spring element.

[0028] In a further preferred embodiment, the locking element and the spring element are connected to one another in that the locking element rests against the spring element, in particular at the lower end of the spring element. The locking element can be moved from the locking to the release position against the spring force of the spring element. This design is particularly advantageous if the side part of the frame has the above-described through-opening through which the locking element projects outwards in the locking position. The separate design of the locking and spring elements has the advantage that the spring force can be transmitted to the locking element without the locking element being tied to the movement of the spring element. The flat spring described above is preferably provided as the spring element, which is connected to the frame at one end and to the locking element at the other end, here via the contact on the contact surfaces.When moving from the locked to the release position, the flat spring pivots, allowing the locking element to be moved essentially linearly along the opening. Advantageously, the locking element does not have to pivot along with the spring element, as relative movement between the locking element and the spring element is enabled. With a fixed connection between the spring and locking elements, the problem could arise that the locking element could become wedged in the opening when pivoting along with the spring element. This problem can be reliably avoided by using the separate spring element in contact with the locking element. This advantage is particularly evident when the locking element is guided in the opening with little play. The transmission of spring force via the contact surfaces is also advantageous with regard to dirt that could accumulate at the opening.Finally, the installation and removal of the spring and locking elements is particularly easy if the spring and locking elements are designed as separate components that are brought into contact when assembled. In a preferred embodiment, the locking element has an upwardly directed hook, particularly at the free end. If the securing projection on the column head has a downwardly directed, in particular diagonally downwardly directed, hook element, the slab formwork element is even better protected against unintentional lifting from the column head in the locked position. In the concreting position of the slab formwork, the upwardly directed hook of the slab formwork element is arranged adjacent to the downwardly directed hook element of the column head in such a way that the hook of the slab formwork element hooks into the hook element of the column head, the locking element remains in the locked position and lifting is thus prevented if the slab formwork element is lifted, for example diagonally upwards, without first transferring the locking element to the release position.Only if the locking element is deactivated before the slab formwork element is lifted against the force of the spring element can the hook of the slab formwork element pass the hook element of the support head.

[0029] Preferably, the column head has two downward-facing hook elements on the underside of each securing projection. This allows the hooks to be secured to locking elements of two adjacent slab formwork elements.

[0030] In order to provide sufficient spring force for the transition between the locking and release positions, the locking element can be attached to the free end of the spring element.

[0031] In a further preferred embodiment, the locking element protrudes inward from the frame. In this embodiment, the locking element is located inside the frame in both the release and locking positions, thereby providing particularly reliable protection against dirt and damage.

[0032] For a secure connection to the support head, it is advantageous in this embodiment if the locking element projects essentially diagonally inwards from a corner area between two side parts of the frame.

[0033] In a structurally simple and reliable design, the locking element is formed in one piece with the spring element.

[0034] A flat piece can be provided for the one-piece construction of the locking and spring element. The locking element can be formed by the free end of the flat piece. To facilitate engagement with the securing projection, the free end of the flat piece can be angled, in particular around a bent or folded edge. The spring element can be formed by an elastically deformable central section of the flat piece.

[0035] Furthermore, the flat piece can have at least one fastening section for attachment to the inside of the frame. The fastening section can be connected to the central section via a connecting section to form the spring element, wherein the central section merges into the free end to form the locking element.

[0036] When fastening in the corner area between two abutting side parts of the frame, it is advantageous if the flat piece has two fastening sections arranged at an angle of preferably substantially 90° to one another, which are fastened to adjacent side parts of the frame arranged in particular at an angle of 90° to one another.

[0037] In order to achieve excavation protection in various areas of the slab formwork element, in particular at all four corners of the slab formwork element, preferably several, in particular four, locking elements are provided on the frame, in particular on the longitudinal and / or transverse sides of the frame and / or in the corner areas of the frame. The locking elements can be identical and designed according to one of the embodiments described above. Thus, the locking elements can each be connected to a spring element so that the locking elements can each be moved from the locked to the released position against the spring force of the spring element. Depending on the design, two locking elements can be located at opposite ends of the longitudinal or transverse side of the frame in order to engage under the securing projections of two formwork supports arranged at a distance from one another.It is particularly preferred if two locking elements are located at opposite ends on both longitudinal or transverse sides of the frame, in order to engage under the securing projections of four formwork supports arranged at a distance from one another. These design variants can also be combined. For example, two locking elements can be provided at opposite ends on opposite longitudinal and transverse sides of the frame. In this variant, a total of eight locking elements are provided.

[0038] To create a formwork surface, i.e., a surface in contact with the concrete, the frame can be connected to the formwork panel at the top. In one design, the formwork panel is firmly connected to the frame. This creates a so-called frame formwork, which is used as a single component (which cannot be dismantled as intended). In an alternative design, the formwork panel is reversibly and detachably connected to the frame. In this design, the slab formwork element can therefore be disassembled into the frame and the formwork panel.

[0039] Preferably, the at least one securing projection on the support head is connected in one piece, ie non-detachably, to a base plate of the support head.

[0040] In a preferred embodiment, the securing projection on the support head has a run-up slope on the upper side for actuating the locking element when the slab formwork element is lowered vertically in a horizontal position onto the support head.

[0041] In a first embodiment of the prop head, the securing projection is directed outward relative to a longitudinal axis of the formwork prop. In this case, the locking element can protrude outward from the side part of the frame in the locked position, in particular substantially in the longitudinal or transverse direction of the frame.

[0042] In a second variant of the support head, the locking projection is directed inward. In this variant, the locking element can protrude inward from the frame, i.e., toward the center of the frame.

[0043] In order to be able to mount multiple slab formwork elements on the column head, the column head preferably has several, in particular four, securing projections for connecting to several, in particular four, slab formwork elements. Preferably, exactly four securing projections are provided on the column head, each of which can be connected to at least one locking element on the frame of the slab formwork element.

[0044] The process for constructing a slab formwork involves at least the following steps: Provision of a formwork support with a support head, Providing a ceiling formwork element in one of the previously described embodiments, and Connecting the slab formwork element to the column head of the formwork support, whereby the locking element is arranged on the frame of the slab formwork element below the securing projection on the column head of the formwork support, so that the slab formwork element is secured against lifting off the formwork support.

[0045] In a first embodiment of the method, the slab formwork element is pivoted upwards over a longitudinal or transverse side of the frame to arrange the locking element in the locking position, wherein the locking element preferably does not come into contact with the securing projection on the column head.

[0046] In a second embodiment of the method, the slab formwork element is lowered substantially vertically onto the column head to arrange the locking element in the locking position, wherein the locking element is deflected into the release position against the spring force of the spring element upon impact with the securing projection and is transferred into the locking position by the spring force upon further lowering.

[0047] In the method for dismantling a ceiling formwork, in which a ceiling formwork element is connected to a formwork support in one of the previously described embodiments, at least the following steps are carried out: Transferring the locking element of the slab formwork element from the locking position to the release position, and Lifting the slab formwork element essentially in a vertical direction from the formwork support.

[0048] The invention is further explained with reference to embodiments shown in the drawings. Fig. 1 to 3 each show an embodiment variant of a ceiling formwork according to the invention, in which several ceiling formwork elements are supported on formwork supports. Fig. 4 and Fig. 5 show detailed views of a ceiling formwork element according to the invention in an assembled state and secured against lifting out by a spring-loaded locking element on the column head. Fig. 6 to 8 show a variant in which the slab formwork element is pivoted upwards by a shorter transverse side into the mounted position on the column head. Fig. 9 to 11 show a further design variant in which the slab formwork element is pivoted upwards around one longitudinal side into the mounted position on the column head. Fig. 12 to 14 show a further design variant in which the slab formwork element is lowered vertically onto the column head. Fig. 15 to 17 show various embodiments of the slab formwork element, which differ in the number and arrangement of the locking elements for excavation protection. Fig. 18 and Fig. 19 show views of a further embodiment of the ceiling formwork element, in which the locking element is arranged inside the frame. Fig. 20 shows a section along the line XX-XX in Fig. 21. Fig. 21 shows a plan view of the slab formwork element according to Fig. 18 to 20. Fig. 22 and Fig. 23 show a further embodiment in which the locking element has a hook at the free end for securing to the support head. Fig. 24 to Fig. 26 show a further embodiment in which the locking element is separate from the spring element, wherein the locking element rests on the spring element in such a way that the locking element can be moved against the spring force of the spring element.

[0049] Fig. 1 to 3 show different design variants of a slab formwork 1, with which a slab or floor element can be concreted. Depending on the dimensions of the slab or floor element, the slab formwork 1 has several, here for example six, slab formwork elements 2, which are supported on telescopic, i.e. length-adjustable, slab or formwork supports 3. The formwork supports 3 are located vertically on a horizontal surface. At the upper end, the formwork supports 3 each have a support head 4, to which one to four slab formwork elements 2 can be reversibly and detachably attached at the corners. The slab formwork elements 2 each have a (single-part or multi-part) formwork panel 5, which is rectangular with longer long sides and shorter transverse or narrow sides. The upper sides of the formwork panels form a flat formwork surface which comes into contact with the concrete during concreting.The slab formwork element 2 also has a formwork frame, hereinafter referred to as frame 6, which supports the formwork panel 5. The frame 6 has four side parts 7, namely two longitudinal side parts 7A on the long sides of the slab formwork element 2 and two transverse side parts 7B on the transverse or narrow sides of the slab formwork element 2. In the embodiment shown, the side parts 7 are arranged perpendicular to the main plane of the slab formwork element 2, defined by the formwork skin of the formwork panel 5.

[0050] In the version of the Fig. 1, the ceiling formwork element 2 is designed as a frame formwork element, in which a single formwork panel 5 is connected to the frame 6. Depending on the design, the formwork panel can be permanently connected to the frame 6, i.e., not intended to be dismantled, or reversibly detachable. In addition, longitudinal and / or transverse stiffeners can be provided between the longitudinal 7A and / or transverse side parts 7B of the frame 6.

[0051] In the version of the Fig. 2, two formwork elements 9, each including formwork panel 5, are reversibly and detachably connected to the surrounding frame 6, in particular in an assembly position inclined to the horizontal.

[0052] In the version of the Fig. 3, the frame 6 is first arranged in the horizontal concreting position and then with the (in Fig. 3 not shown) formwork panel 5.

[0053] All design variants of the slab formwork element 2 have in common that at least one locking element 10 is arranged on the frame 6, which, when the slab formwork element 2 is mounted on the formwork supports 3, engages under one of the four securing projections 11 provided on the support heads 4 of the formwork support 3. The securing projection 11 thus forms an undercut for the locking element 10. Furthermore, holding parts 4A, here holding pins, are provided on the support heads 4, onto which the slab formwork element 2 is placed. The holding pins 4A serve both for horizontal securing and as a pivot point for a previously described type of assembly. This secures the slab formwork element 2 against lifting out, which could be caused in particular by wind forces that can load the slab formwork element 2 from below.

[0054] In the embodiments shown, the locking element 10 is connected to a spring element 12 in such a way that the locking element 10 can be moved against the spring force of the spring element 12 from a locking position engaging under the securing projection 11 into a release position arranged laterally next to the securing projection 11, here a temporary assembly position.

[0055] In the embodiment shown, the excavation protection or locking element 10 is mounted on the frame 6 so as to be pivotable about a horizontal pivot axis in the main plane of the slab formwork element 2, i.e., in the mounted state on the support head 4. The locking element 10 is provided on a lower edge region of one of the longitudinal 7A or transverse side parts 7B of the frame 6 such that the locking element 10 is arranged below the securing projection 11 during assembly of the slab formwork element 2 on the support head 4.

[0056] Advantageously, the blocking element 10 is arranged essentially completely under a retaining edge 6A on the upper side of the frame 6 in the locked position. Thus, in the locked position, the blocking element 10 is covered on top by the retaining edge 6A, which surrounds the formwork panel 5 at the edge and protrudes laterally outward beyond the side part 7. This protects the blocking element 10, in particular from falling objects and contamination from, for example, concrete.

[0057] Preferably, the holding edge 6A has a drip edge on the underside, which further improves the protection of the blocking element 10.

[0058] The frame 6 also has a lower edge 6B, in particular on the longitudinal and transverse sides, which secures the ceiling formwork element 2 in conjunction with the holding part 4A in the horizontal direction against displacement away from the securing projection 11 and thus the locking element 10 remains in the locking position.

[0059] In the Fig. 4 to 17 show a first embodiment in which the spring element 12 is fastened to the inside of the respective side part 7 of the frame 6, but the locking element 10 protrudes outwards from the outside of the side part 7 of the frame 6 in the locked position, i.e. away from the center of the slab formwork element 2. For this purpose, the side part 7 of the frame 6 has a passage opening 13 through which the locking element 10 protrudes outwards in the locked position. In the embodiment shown, a flat spring, in particular a metal plate, is provided as the spring element 12, which is connected at one end to the frame 6 and at the other end to the locking element 10. A pin is provided as the locking element 10, which is attached to the free, lower end of the spring element 12, here in the form of a flat spring.

[0060] Fig. 4 and Fig. 5 show the assembled state of the slab formwork element 2 on the support head 4 of the formwork prop 3. The locking element 10 projects, with a vertical distance, in a direction parallel to the main plane of the slab formwork element 2 under the securing projection 11, which in this embodiment variant is arranged with respect to the longitudinal axis 3A of the formwork prop 3 (cf. Fig. 4) is directed radially outwards. If vertical forces, especially wind loads, act on the slab formwork element from below, see arrow 14 in Fig. 5, the locking element 10 abuts against the underside of the securing projection 11, thereby preventing the slab formwork element 2 from being lifted off the support head 4 in this area.

[0061] In the Fig. 6 to 8 show a first variant of the method for erecting the slab formwork 1. In this variant, the slab formwork element 2 is pivoted upwards into the horizontal position via a transverse side, i.e. one of the shorter sides, of the frame 6, see arrow 15. The locking element 10 is arranged in the locked position below the securing projection 11. If, during pivoting upwards, the locking element 10 comes into contact with the securing projection 11 on the support head 4, the locking element 10 is pressed in by the flexible arrangement on the slab formwork element 2. When the slab formwork element has been fully pivoted upwards, the locking element 10 is automatically returned to the locked position behind the securing projection 11 by the connected spring element 12.

[0062] In the Fig. Figures 9 to 11 show a second variant of the method for erecting the slab formwork 1. In this variant, the slab formwork element 2 is pivoted upwards over a longitudinal side, i.e., one of the longer sides, of the frame 6 into the horizontal position, see arrow 16. The locking element 10 is arranged under the locking projection 11 in the locking position without touching the locking projection.

[0063] In the Fig. Figures 12 to 14 show a third variant of the method for erecting the slab formwork 1. In this variant, the slab formwork element 2 is lowered vertically, see double arrow 17, from above onto the support head 4. The securing projection 11 on the support head 4 has a ramp 18 on its upper side. When the locking element 10 encounters the ramp 18, the locking element 11 is pressed inward against the action of the spring element 12, thereby enabling further lowering of the slab formwork element 2 until the locking element 11 snaps under the securing projection 11 due to the restoring forces of the spring element 12.

[0064] As from Fig. As can be seen from Figures 15 to 17, several locking elements 10, each in conjunction with a spring element 12, can be provided on the frame 6. These locking elements 10 with the spring elements 12 can be identical to the embodiment described above.

[0065] In the variant of the Fig. 15, two locking elements 10 are provided on each transverse side of the ceiling formwork element 2, which protrude from the transverse side parts 7B of the frame 6 in the longitudinal direction of the ceiling formwork element 2, relative to the locking position.

[0066] In the variant of the Fig. 16, two locking elements 10 are provided on each long side of the ceiling formwork element 2, which protrude from the long side parts 7A of the frame 6 in the transverse direction of the ceiling formwork element 2, relative to the locking position.

[0067] In the variant of the Fig. 17, two locking elements 10 are provided on each longitudinal and transverse side of the ceiling formwork element 2, which protrude in the longitudinal or transverse direction of the ceiling formwork element 2, relative to the locking position, from the longitudinal 7A or transverse side parts 7B of the frame 6.

[0068] In the Fig. 18 to 21 show a further embodiment of the slab formwork 1. In this embodiment, the locking element 10 and the spring element 12 are arranged within the interior of the frame 6 framed by the side parts 7. The locking element 10 projects inward with respect to the side parts 7 of the frame 6. In the embodiment shown, the locking element 10 projects essentially diagonally inward, towards the center of the slab formwork element 2, from a corner region 8 formed between two side parts 7 of the frame 6. The support head 4 has a correspondingly designed securing projection 11, which in this embodiment is directed inward, towards the longitudinal axis 3A of the formwork support 3. In the assembled concreting position, the locking element 10 is again arranged below the securing projection 11 on the support head 4.

[0069] In this embodiment, the locking element 10 can be formed integrally with the spring element 12. For this purpose, a flat piece 19 can be provided, wherein a free end section 19A of the flat piece 19 forms the locking element 10 and a central section 19B forms the spring element 12. In the embodiment shown, the central section 19B of the flat piece 19 is connected via a connecting section 19C to two fastening sections 19D, which are attached to the inner sides of the two adjacent side parts 7 of the frame 6.

[0070] In the Fig. 22 and Fig. Figure 23 shows a variant in which the locking element 10 is designed as a latch with a square cross-section. At its free end, the locking element 10 has an upwardly directed hook 20. Accordingly, the support head 4 has two diagonally downwardly directed hook elements 21 on the undersides of the securing projections 11, which prevent the slab formwork element 2 from being inadvertently lifted from the support head 4 in the concreting position with the locking element 10 in the locked position.

[0071] Fig. 24 to Fig. 26 show a modification of the embodiment according to Fig. 4 and Fig. 5. In contrast to the embodiment of the Fig. 4 and Fig. 5, the locking element 10 is according to Fig. 24 to Fig.26 separate from the spring element 12. The locking element 10 and the spring element 12 are connected to one another in that the locking element 10 rests against the spring element 12, here at the lower end of the spring element 12. In the embodiment shown, a peg-shaped section of the locking element 10 protrudes outwards through the through-opening 13 in the locked position. The locking element 10 has a contact element inside the frame, here a contact plate 10A, which prevents the locking element 10 from falling out of the through-opening 13. In the embodiment shown, a flat spring is provided as the spring element 12, which rests against the contact plate of the locking element 10, so that the locking element 10 is pressed outwards towards the locked position. QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] DE 42 11 200 C2 [0004, 0008] DE 4308607 A1

[0008] AT 409 648

[0010]

Claims

[1] Ceiling formwork element (2) for connection to a column head (4) of a formwork support (3), comprising: a frame (6) for a formwork panel (5), a locking element (10) on the frame (6) for engaging under a securing projection (11) on the support head (4) of the formwork support (3), characterized by , that the locking element (10) is connected to a spring element (12) so that the locking element (10) can be transferred from a locking position into a release position against the spring force of the spring element (12). [2] Ceiling formwork element (2) according to claim 1, characterized by that the locking element (10) can be pivoted from the locking position into the release position about a preferably substantially horizontal pivot axis. [3] Ceiling formwork element (2) according to claim 1 or 2, characterized bythat the locking element (10) is provided on a lower edge region of a longitudinal or transverse side part (7; 7A, 7B) of the frame (6). [4] Ceiling formwork element (2) according to one of claims 1 to 3, characterized by in that the blocking element (10) projects outwards from the side part (7) of the frame (6) in the blocking position, in particular substantially in the longitudinal or transverse direction of the frame (6), wherein the side part (7) of the frame (6) preferably has a passage opening (13) through which the blocking element (10) projects outwards in the blocking position. [5] Ceiling formwork element (2) according to one of claims 1 to 3, characterized by that the locking element (10) projects inwards from the frame (6), wherein preferably the locking element (10) projects substantially diagonally inwards from a corner region (8) between two side parts (7; 7A, 7B) of the frame (6). [6] Ceiling formwork element (2) according to one of claims 1 to 5, characterized bythat the locking element (10) is formed in one piece with the spring element (12). [7] Ceiling formwork element (2) according to one of claims 1 to 6, characterized by that several locking elements (10) are provided on the frame (6), in particular on the longitudinal and / or transverse sides of the frame (6) and / or on the corner regions (8) of the frame (6). [8] Ceiling formwork element (2) according to one of claims 1 to 5 or 7, characterized by that the locking element (10) and the spring element (12) are connected to one another in that the locking element (10) rests on the spring element (12), in particular on the lower end of the spring element (12). [9] Ceiling formwork (1), comprising: a ceiling formwork element (2) according to one of claims 1 to 8, and a formwork support (3) with a support head (4) which has a securing projection (11), wherein the locking element (10) engages under the securing projection (11) of the support head (4) in the locking position. [10] Ceiling formwork (1) according to claim 9, characterized by that the securing projection (11) on the support head (4) has a run-up slope (18) on the upper side for actuating the locking element (10) when the ceiling formwork element (2) is lowered vertically in a horizontal position onto the support head (4). [11] Ceiling formwork (1) according to claim 9 or 10, characterized by that the support head (4) has several, in particular four, securing projections (11) for connection to several, in particular four, ceiling formwork elements (2).

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