DE102010001042B4 - Drop head for a slab formwork system and slab formwork system - Google Patents

Abstract

Fall head (10, 142) for a slab formwork system with at least one lowerable support (12) for a slab formwork element (30, 112, 120 to 124), the support (12) from the vertical projection of the slab formwork element (30, 112, 120 to 124 ) can be pivoted out about a largely horizontal pivot axis (34) such that the slab formwork element (30, 112, 120 to 124) can be lowered past the at least one pivotable support (12), and the pivot axis (34) of the support (12) above the support (12) is arranged.

Description

TECHNICAL AREA

The invention relates to a drop head for a slab formwork system and a slab formwork system with such a drop head.

In the field of construction, it is customary, especially in the construction of concrete floors, to place on columns a grid of carriers on which turn formwork panels are placed to pour after delineation of the ceiling edges of the concrete floor. In this case, special heads for props are also known between which formwork beams or elements can be attached.

STATE OF THE ART

For example, the DE 33 16 557 C1 a slab formwork system with a drop head and a drop piece, which can perform a certain tilting movement.

From the DE 10 2004 004 883 A1 is a Deckenschalungspaneel in which a support means at the end of the panel is so adjustable in position that the maximum dimension between two such support means can be reduced, so that the panel for stripping between the stationary columns can be removed.

The DE 101 35 664 B4 relates to a support for slab formwork with a drop head, which is divided into two parts, wherein the two parts are mounted differently lowered on the support, and a part is rotatable about the support.

The US Pat. No. 1,888,738 shows a drop head for a slab formwork system with a lowerable support for a slab formwork element, which can be swung out of the vertical projection of the slab formwork element about a horizontal pivot axis, so that the slab formwork element can be lowered past the support over.

PRESENTATION OF THE INVENTION

The invention has for its object to provide a drop head and thus provided a slab formwork system through which the necessary in the context of switching on and off work safely, easily and efficiently can be performed.

The solution of this problem is on the one hand by the case head described in claim 1. Accordingly, this has at least one lowerable support for at least one slab formwork element which can be pivoted out of the vertical projection of the slab formwork element about a substantially horizontal axis, which is arranged above the support, that the slab formwork element can be lowered past the at least one pivotable support. In other words, the support or fall piece of the drop head according to the invention is pivotable such that a slab formwork element such. B. a Deckenschalungspaneel or a slab formwork carrier by a movement next to the support and along this can be lowered. The above-mentioned "vertical projection" is understood to mean that space which the ceiling formwork element in the position of use thus largely covers horizontally, in the vertical direction, that is, upwards and downwards.

From this space, the slab formwork element usually in the context of lowering, so the Ausschalens not emerge. The reason for this is that, in the context of the described Ausschalens Although described the slab formwork elements can be removed because the concrete is already cured to a certain extent at this time. However, the supports with the drop heads remain in such a way that the (not lowered) head plates of the supports support the concrete ceiling selectively until sufficient further curing. The possibility of removing the slab formwork elements is advantageous insofar as these elements can be brought early to another location, typically one to a floor higher ceiling. Here, these elements, which are subject to special stress and pollution due to the frequent and changing use, in the system according to the invention are not necessarily equipped with moving parts. Rather, these have only suitable bearings, which interact with the supports of the drop heads. The drop heads are provided with the described, pivotable supports whose swinging out, as described in more detail below, advantageously in a simple manner from the ground and in the context of removal of the slab formwork elements can be triggered. Since the supports can be swiveled out of the described vertical projection, the slab formwork elements can simply be lowered.

As mentioned, the drop head according to the invention has a (not lowerable) head plate, as well as a connection possibility to a prop. Furthermore, a support element is preferably provided, which has the lowerable support in a first position at a higher level, and in a second position, in which it has been displaced, for example by a hammer blow, on a second, lower level. When the supports have been lowered, the ceiling formwork elements supported thereby can be removed in the manner described.

The pivoting out of the described vertical projection is particularly simple in that a pivot axis of the support is arranged above the support. This means that the support can advantageously be initially pivoted upwards, for example by means of the undercut described below, by engagement with the ceiling formwork element, thereby disengaging from the ceiling formwork element. In the subsequent lowering movement, the support can be swung out of the vertical projection simultaneously.

Preferred developments are described in the further claims.

In particular for safety in the position of use, in particular in the case of strong winds, it offers advantages if at least one support has at least one undercut acting in the vertical direction. The undercut essentially provides a projection below which and on which a suitable section of a slab formwork element can be held, so that this, which is quite possible in strong winds, can not be lifted. As described in more detail below, the undercut can also be used to the fact that when lifting the slab formwork element at the beginning of Ausschalvorganges also the support is slightly raised. In the arrangement of the pivot axis of the support above the described undercut moves away from the edge of the slab formwork element and thus comes out of engagement. As a result, the slab formwork element can subsequently be lowered, while the support is swung out of the vertical projection of the slab formwork element, for example by the pressure which the slab formwork element exerts on lowering it.

In the first tests, the formation of the same on a largely vertically oriented pin has also proved favorable for the concrete design of the undercut.

In certain applications, it may also be advantageous if the drop head has at least one second support that can be lowered by a distance that differs from a lowering distance of the first support. For example, ceiling formwork panels can be placed at the corners of typically a plurality of first, further lowerable supports. In this case, however, the surfaces immediately adjacent to the top plate of the drop head (on at least two sides) are to be closed by separate formwork elements. For this purpose, so-called cover strips or "small panels" have proven to be low, which can be lowered at stripping by a shortened path. This reduces the risk of damage. In the currently known slab formwork systems, it is customary to use cover strips or small panels, for example made of plastic; each resting on the top plates of the drop heads. In other words, the top plates themselves do not form part of the formwork. If, however, what is desired for economic reasons, as many components of a slab formwork system should be removed as early as possible, and the concrete is supported only selectively or in strips until complete curing, the cover strips described initially remain in place. If the supports are to be removed later, this is not possible for two supports at the same time, in order to also remove the cover strip resting on these two supports. Thus, first a support is removed, and the cover strip is no longer supported at one end, while it remains trapped at the other end between the stationary support and the concrete. In this situation, a break often occurs due to the dead weight of the cover strip. In the preferred embodiment of the invention described above, the small panels or cover strips may be removed after lowering the drop heads together with any larger formwork panels. This offers on the one hand economic advantages, because even the small panels or cover strips are used earlier in other floors. Furthermore, there is no longer the risk of breaking the cover strips or small panels. Finally, the described, comparatively narrow formwork elements, which were previously referred to as small panels or cover strips, easily ausschalbar, since they can be removed laterally from the lowered drop heads parallel to the freshly created concrete ceiling.

The solution of the above object is further achieved by the slab formwork system described in claim 5, which has at least one drop head according to the invention. As further elements of the slab formwork system, one or more props and one or more slab formwork elements, in particular girders or panels, may be mentioned.

In an advantageous manner, the undercut provided on at least one support can cooperate with an undercut on at least one slab formwork element in such a way that the slab formwork element is secured on the one hand against undesired lifting and on the other hand Other when stripping of the undercut of the support can be disengaged, and finally can be removed past the pivoted bearing.

Preferably, the slab formwork system described herein further comprises at least one carrier described in more detail below. This preferably consists at least partially of metal, in particular steel, but may be any other suitable material, such as. As wood, aluminum or fiber reinforced plastic. In the case of steel beams, however, a particular challenge is to be able to continue to manipulate the carrier or a plurality of such carriers, which may be integrated into a formwork element. In other words, the carrier should save as much weight as possible while at the same time meeting the requirements imposed on the strength. This is achieved by one or more of the measures described below.

On the one hand, the carrier may be curved at least slightly in the direction of the concrete to be filled. This essentially means a certain "preload" in the direction of the load, which results in that the load can be absorbed particularly well. This is possible in particular without the risk of deflection against the curvature direction, which would lead to unwanted bulges or bulges at the bottom in the finished concrete pavement. The curvature described may be formed as a uniform curvature and may be on the order of a few millimeters, depending on the length of the carrier, for example, about 4 millimeters.

On the other hand, the slab formwork support can have openings whose size and / or shape and / or orientation and / or distribution changes over the length of the support such that the support is less weakened in a middle area than in at least one end area. In this regard, it should be noted that such a support is usually mounted at its ends, and in its course a uniform line load is applied. This results in a load in middle areas, which is greater than in end areas. This is taken into account thereby, at the same time the possibilities of weight saving are used, that the carrier is provided with openings which are either increasingly smaller and / or less in the central region. In this case, the openings over the entire carrier can have a substantially constant shape, for example circular, but become smaller towards the middle. Alternatively or additionally, it is conceivable that the shape and / or orientation of the openings in the direction of the center changed in such a way that a smaller weakening occurs here. For example, it is possible to move from an ellipse shape in the zones near the edge to a circular shape in the middle region, and / or elliptical openings can be aligned horizontally instead of vertically. By the described measures or a combination thereof can be saved in particular on a steel beam extensive weight, and at the same time can meet the strength requirements in an advantageous manner.

This applies equally to the measure according to which the carrier itself is designed in terms of its dimensions over the length such that it is less weakened in a central region than in at least one end region. This can be accomplished, for example, by the fact that the carrier, which in a sectional view gives the impression of an "edgewise" arrangement, is "higher" in the central area and thus more stable than in peripheral areas. This also makes it possible to ensure the strength over the entire length, in particular also in the middle region, and at the same time to save weight in particular at the edges.

With regard to the versatility of the slab formwork support, it has proven to be advantageous to design at least one opening such that at least one bracket can be suspended for supporting another, preferably a wooden formwork support. As a result, the compatibility with other slab formwork systems, which for example have wooden formwork beams, can be guaranteed. Furthermore, the described suspension for the particularly flexible embodiment of the edge region of the slab formwork system according to the invention is low. It should be noted that for the hanging of the described strap a regular arrangement, in other words a kind of grid, of possibly equal and / or uniform openings is conceivable. In particular, such an embodiment, optionally in combination with one or more of the features described above or below, as well as the use of at least one opening in a slab formwork carrier for hanging at least one bracket for receiving a further, preferably a timber formwork support as subject of the present application to watch. This applies equally to an attachable in an opening of a slab formwork bracket. This can be largely U-shaped with a bottom whose "width" (viewed from above) corresponds approximately to the width of a carrier (also viewed from above, measured perpendicular to the longitudinal extent of the carrier). On this floor, two legs can be mounted on different sides, so that they are in use largely vertically to different sides of the Formwork support extend. By mutually directed, but offset by the length of the bottom projections or hook the bracket can be hung, for example, in two adjacent openings of a formwork support and used for placing one or more wooden formwork beams. It has heretofore been known to provide laterally strip-like projections over substantially the entire length of the carrier in the case of formwork carriers, which have an elevation at their end, so that the described brackets can be suspended. The measure described above, to use openings in the support for hanging ironing, on the other hand offers the advantage that there is a much lower risk of contamination than in the described strip-shaped projections.

As mentioned, the slab formwork carrier alone develops its advantages, but it can be advantageously integrated into a formwork element, in particular panel, and such an element can have several of the described slab formwork supports, so that the advantages described in a special way for a Use shuttering element.

For the flexible use of the formwork support is moreover preferred that it is provided at least at one end with at least two directed in the same (usually vertical) direction supports, which are arranged at different vertical heights that the carrier on at least two different horizontal Levels can be placed on other elements of a slab formwork system. In this consideration, it is assumed that the formwork support is arranged substantially horizontally in use, but it is also conceivable that the use position of the formwork support is vertical, and thus that different positions are possible in the lateral direction. In this respect, the formwork support described herein is not necessarily always provided as a slab formwork support, but it can be used as any formwork support. In any case, directed in the same direction, at least two supports ensure that the formwork support is particularly versatile.

If this can be nailed, for example by means of a suitable wood insert, the supports directed in the same direction have the advantage that this nailability applies to the use on the two (or more) horizontal levels. The supports provided on at least two vertical heights can be used particularly well if a grid of several carriers is to be formed. By using the "higher" support, several formwork beams can be arranged at a first, lower level. Also, by using the higher support can be further formwork support, for example, transverse to the formwork supports mentioned above hang on this, and are then at the same vertical level, such as formwork beams, which are used immediately using their "lower" support, and thus Are "higher". In particular, the slab formwork carrier can thereby be used as a "transitional support", for example to areas in which another slab formwork system is used, or as an "edge support", for example to existing walls, in order to produce the "correct" level of formwork.

It has been found to be advantageous for the handling of the slab formwork carrier when the higher support is arranged closer to the end of the slab formwork support, as the lower support. In other words, the "height" of the slab formwork carrier decreases towards the end, which is accompanied by the above-described change in shape of the support along its length, and moreover provides a simple procedure for laying on.

As materials for at least one support whose training at least partially made of metal, especially steel and / or a plastic, in particular fiber-reinforced, proved to be favorable in initial experiments.

In order to achieve a security in all horizontal directions, it is currently further preferred for at least one support that it is sleeve-shaped. Such a shape forms a substantially vertically extending cavity into which a substantially vertical projection or pin of a counter-support, for example on a support, can be inserted. In particular, the cavity described is limited to at least three, preferably four sides in the horizontal direction and / or provided with a rounded contour, so that a particularly good interaction with round pins, such as a column head, is possible.

Particular advantages in terms of manageability, and in particular with regard to the flexible use are given in those preferred embodiments, in which below a first support a second support and can be folded away. In this embodiment, the length of the carrier does not change when using the various supports, so that favorable properties are achieved. In particular, the two supports in the closed state of the lower support are substantially aligned with each other.

For the slab formwork system according to the invention, a formwork element is furthermore preferred in which beams running transversely between edge supports are spaced less in a middle region of the panel than in end areas. As a result, the particularly loaded middle region can be reinforced in some way, while weight is saved in the end regions.

Finally, an embodiment of a formwork element has proved to be particularly favorable, in which any edge support are not curved, and this measure is used only for at least one particularly stressing cross member between the edge beams.

Finally, it should be mentioned that all above and below described individual elements of a slab formwork system, in particular also the bracket and the cover strip, alone, with any combinations of the features described herein and any combinations of the individual elements are to be regarded as the subject of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in more detail with reference to an embodiment shown in the drawings. Show it:

1 a perspective view of a drop head according to the invention;

2 a side view of the drop head according to the invention with an already lowered Deckenschalungspaneel;

3 a detail of 2 when lifting the slab formwork element;

4 a detail of 2 when lowering the slab formwork panel;

5 a perspective bottom view of a corner of a slab formwork panel;

6 a perspective view of one end of a slab formwork carrier;

7 a perspective view of a column head with a laid in a first state according to carrier 6 ;

8th a perspective view of a column head with a laid on it in a second state according to carrier 6 ;

9 a schematic view of an integrated in a shuttering panel carrier;

10 another embodiment of a carrier; and

11 a still further embodiment of a carrier.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

The in 1 illustrated drop head 10 has at its (in the position of use shown) lower end substantially a pipe section 20 on, with which he can be inserted into the upper end of a prop and fastened to this. At its upper end is the drop head 10 with a head plate 22 provided, which may also be referred to as a stop plate and on the one hand serves as a tolerance limit and on the other hand limited the movement of the pivotable support described below, which is particularly useful in the last row of panels, if only one of two jointly pivotable supports is occupied. In particular, in this situation, the swivel plates described in more detail below 24 namely, due to the one-sided load the tendency to pivot completely down. In this case, there is a risk that the panel from the fully pivoted support disengages and falls. However, in the drop head according to the invention, the dimensions and positional relationships are preferably selected such that the top plate 22 as a stop for the panel 30 serves. Especially with one-sided load, the weight of the panel 30 to the fact that (cf. 2 ) pivoting the pivot plate 24 (according to the in 2 shown situation in the clockwise direction) is effected. Due to the arrangement of the pivot point of the pivot plate 24 above it, pivoting of the pivot plate moves 24 the formwork panel 30 in the direction of the drop head 10 , The formwork panel 30 However, suggests the (largely vertically downwardly extending) side surfaces of the top plate 22 on, so that the pivoting movement of the pivot plate 24 is stopped. The formwork panel 30 can thus, as described in more detail below, initially held securely and then removed.

Just below the top plate 22 is in the embodiment shown a so-called second support 18 provided, which serves in this embodiment for laying a (not shown) cover strip whose width is substantially the width of the top plate (measured from bottom left to top right according to 1 ) corresponds.

The support 18 is lowerable in the embodiment shown by a smaller way than the support described in more detail below 12 ,

In the embodiment shown, two opposing supports each 12 on a common pivot plate 24 formed, so that in each case the corners of two opposite (not shown) slab formwork panels can be placed on these supports. Between the two at the front, inclined drawn swivel plate 24 laid slab formwork panels is in the use position on the support 18 lying cover strip.

In addition, according to the presentation of 1 behind the pivot plate provided with reference numbers 24 is another such pivot plate, so that two Deckenschalungspaneele on the left front side of the top plate 22 can be arranged with each other attachment. In many arranged in this way slab panels and cover strips a concrete ceiling can be poured. As part of the Ausschalens is the security part 26 shifted in a substantially horizontal direction so that it disengages from a suitable portion on the drop head and up to the foot plate 28 falls. This also makes the swivel plates 24 and lowered any overhead thereon formwork panels.

This position is in 2 shown. The slab formwork panel is with 30 denotes and is still in the situation shown on the support 12 on. In the embodiment shown, the support has 12 a largely vertical pin 16 which extends upwards and an undercut 14 in the form of a (better in 3 recognizable) projection. This undercut acts with an undercut 32 (see. 3 ) on the slab formwork panel 30 so together, that the slab formwork panel 30 is secured in the position of use in an advantageous manner against lifting. Here, the projection of the undercut protrudes 14 essentially in the above the undercut 32 inside the room.

In 3 is shown as the undercuts now described for lowering the slab formwork panel 30 can be disengaged. This is advantageously possible because of a pivot axis 34 (see. 2 ) of the support 12 located above it. As a result, if the slab formwork panel 30 from the ground, for example, by means of a suitable rod is slightly raised, and the undercut formed therein 32 about the at the pin 16 trained undercut 14 the swivel plate 24 of the support 12 raises, the undercut 14 due to the rotational axis arranged above it 34 (see. 2 ) Moved away from this, and thus gradually disengaged. In particular, the in 3 Movement shown continued without moving the slab formwork panel in the horizontal direction that the undercuts completely disengage, and essentially the horizontally protruding plate that the undercut 32 on the slab formwork panel 30 forms above the pin 16 is arranged. This is especially true when the pivot plate 24 is leveled out, and largely horizontally aligned.

Subsequently, the slab formwork panel, still from the ground, is supported by a worker with a suitable pole and lowered down so that, as in 4 Shown sections of Deckenschalungspaneels on top of the pin 16 push that swivel plate 24 is pivoted so that the support 12 sufficient from the vertical projection of the slab formwork element 30 is swung out. In other words, the support including the pin moves as shown in FIG 4 to the left, leaving the vertical projection of the ceiling formwork element 30 below the same for stripping the slab formwork element and after performing the same process on the other side whose removal is down towards free. The undercut 32 of the slab formwork panel 30 and any, for example, sleeve-like elements which are provided on the slab formwork panel for laying on the support, for example, on an integrated support of the slab formwork panel, which may be made of metal, in particular steel, for example, may be provided.

In 5 is a corner of a formwork element in the form of a Deckenschalungspaneels 110 to recognize. The corner 112 thus forms an end in the sense of the preceding description. Especially at the edges and at the corners 112 has the formwork panel 110 Support or profiles, preferably made of metal, in particular steel, on which define a peripheral edge in the case shown, which defines a (flat) space in which a shuttering plate is inserted, which forms the actual formwork skin together with numerous other such formwork panels. In the position of use below this formwork skin, the shuttering panel on the described carrier, which can form a frame and can be provided as the frame reinforcing cross member.

In the in 5 shown corner 112 are in accordance with the principles of the invention, two supports 114 . 116 intended. In the case shown, both are largely sleeve-shaped, that is closed on at least three sides, and extend differently far from the end of the formed by the shuttering plate (in the use position) Formwork element. This is the formwork panel 110 at two different levels on suitable other elements of a slab formwork system, such as supports or their heads can be placed. In the case shown is the higher support 114 closer to the corner 112 as the lower support 116 , which offers advantages in handling. Through the sleeve-like shape of the two supports 114 . 116 For example, the supports can cooperate with suitable counter-elements, for example pins, and are thereby secured against displacement in all horizontal directions. The formwork panel described above 110 Incidentally, with reference to the 1 to 4 described panel 30 correspond. In particular, the in 5 shown panel on at least one corner and in at least one support with reference to the 2 to 4 have described undercut.

The horizontal fuse is similar to the one in FIG 6 Shuttering element shown in the form of a formwork support 120 the case, but with a lower support 130 can be folded in and out. The lower 130 and the upper support 132 are in turn provided with a vertically extending cavity, which is limited in this case on at least three sides and provided with a rounded contour. Thus, here can enter a pin or pin of a counter element to secure the formwork support against lateral displacement. As in 6 is recognizable, is the lower support 130 one below the support 132 located axis 134 swiveling, so that it folded away in a way in the bridge 136 of the carrier 120 is accommodated, and the operational capability of the upper support 132 not impaired. At the in 6 shown formwork support results in the particular advantage that the two supports 130 . 132 are directed in the same direction. As a result, for example, one at the top of the carrier 120 inserted wood insert 138 for fixing formwork panels by means of nails when using both supports 130 . 132 available. Thus, the formwork support 120 an always flexible usable ceiling formwork element.

In 7 is shown as the formwork support 120 using the lower support 130 on a column head 140 which can be placed on the column head 10 of the 1 to 4 equivalent. In particular, the formwork support 120 on a pin of the same so placed that the upper edge of the formwork support 120 on a level with the top plate 142 of the column head 140 located. As a result, shuttering panels are on the support 120 and the headstock 142 placeable. Alternatively, the dimensions may be selected such that the upper edge of the formwork support 120 to the thickness of a formwork panel below the top plate 142 so that the created formwork skin both through to the wearer 120 laid formwork panels and the top plate 142 itself is formed. In particular, in this case, the formwork support 120 be used as a so-called transition or edge support. As a transitional carrier, it forms the transition from a formwork system, the prefabricated formwork panels and largely strip-shaped small panels between individual column heads 142 and an area made, for example, by using a timber formwork system with timber beams and custom-made formwork panels. In order to hang the formwork panels not only on the wooden beams described, but also at the transition to the formwork system described above in the first place on an element of this system, the formwork support shown 120 be used in an advantageous manner. In the situation described above with regard to the transition to another formwork system or the connection of elements of another formwork system can also be used in an advantageous manner the above-described hooked into an opening of a formwork support bracket. The advantageous use of the formwork support 120 Similarly, at the edges of a formwork system having prefabricated formwork elements. At the edges, for example, to walls, often individually tailored formwork panels or boards must be used, which advantageously on the formwork support described 120 who then acts as a border carrier, can be hung up.

Furthermore, as in 8th shown by several formwork beams 120 a grid of yoke and cross beams are formed. In order in such an application, the Jochträger 122 on the headstock 142 To bring "correct" level, both at the cross members 122 as well as the yoke makers 124 the upper supports 132 used. The yoke bearers 124 are thus (compared with 7 ) at a lower level, and which, as shown, on the yoke beams 124 placed cross member 122 then form that with respect to the top plate 142 "Right" level. This may be, as described above, to the same level, so that formwork panels on the top plate 142 and the crossbeams 122 be placed in cooperation. Alternatively, the cross members can 122 to the thickness of a formwork panel below the top plate 142 so that the on the cross member 122 laid formwork panels a consistent level with the top plates 142 form, and the formwork as a whole by these two elements, in cooperation with each other is formed.

In 9 is exaggerated in a side view and in terms of curvature an advantageous carrier 210 shown, which is integrated in the example shown in a formwork element, of which, however, only edge profiles 212 are shown. In the final state is located above the profiles 212 and the vehicle 210 a formwork panel on which concrete is poured. The resulting line load loads the carrier in particular at its central region comparatively extensive, since it is supported at its edges on suitable supports. To counteract this load in the form of a kind of bias, the carrier according to the invention in the in 9 shown embodiment curved in the direction of the expected load. This vault is in 9 However, in practice, depending on the length of the carrier, in practice, a few millimeters. At the in 9 The carrier shown may in particular be one of possibly a plurality of such cross members, which are at least partially curved in the manner described, while this is for the edge members or profiles 212 not necessarily be provided. At the in 9 shown embodiment are also openings 214 shown unevenly distributed over the length of the carrier.

At the in 10 shown embodiment are such openings 214 according to an alternative measure, but with the in 9 can be combined over the course of the wearer 220 changed in terms of their size. In particular, the openings towards the center are smaller and are completely omitted in the illustrated embodiment in the central region, so that this particularly stressed area is much less weakened than the end regions. As a result, the strength can be ensured over the entire course of the carrier, weight being saved especially in the less loaded end regions.

This applies equally to the in 11 shown third embodiment of a carrier 230 which is additionally designed in the end regions A (according to the position of use) less "high" than in a central region. At the ends are supports 232 to recognize. Over the course is the carrier 230 further provided with openings whose shape, orientation and distribution varies over the length of the carrier. In the example shown, openings are provided in the end regions in the form of a respective comparatively flat triangle whose corners are rounded with different radii. In the example shown, two sides of the triangle are substantially parallel to edges of the beam, namely to the top edge and the bottom edge inclined in this area. The radius of curvature is greatest towards the end of the beam and smallest at the top, toward the inside of the beam. Instead of the openings shown also oval or elliptical and rectangular openings may be provided with rounded portions at their ends and, for example, be aligned substantially parallel to the inclined in this area lower edge of the carrier. Elliptical or oval openings and / or openings in any of the shapes described above may be substantially vertically aligned with the center of the carrier as shown, and may be substantially horizontally aligned further toward the center. In the middle of the carrier are also found circular openings. Overall, it could be found for the example shown a special distribution, shape and orientation change of the openings that weight can be saved and at the same time the strength is ensured over the entire course of the wearer. The foregoing with reference to the 9 to 11 described measures on a carrier, for example, to the in 6 to 8th shown carriers are realized, and / or carrier with one or more of these measures can in a formwork panel 30 of the 2 to 4 or 110 of the 5 to get integrated.

Claims (17)

Falling head ( 10 . 142 ) for a slab formwork system with at least one lowerable support ( 12 ) for a slab formwork element ( 30 . 112 . 120 to 124 ), whereby the support ( 12 ) from the vertical projection of the ceiling formwork element ( 30 . 112 . 120 to 124 ) in such a way around a substantially horizontal pivot axis ( 34 ) can be swung out that the ceiling formwork element ( 30 . 112 . 120 to 124 ) on the at least one pivotable support ( 12 ) is lowered over, and the pivot axis ( 34 ) of the Auflagers ( 12 ) above the support ( 12 ) is arranged. Drop head according to claim 1, characterized in that at least one support ( 12 ) at least one undercut acting in the vertical direction ( 14 ) having. Drop head according to claim 2, characterized in that the undercut ( 14 ) on a largely vertically oriented pin ( 16 ) is trained. Drop head according to one of the preceding claims, further comprising at least one second support ( 18 ), which can be lowered by a distance which extends from a lowering distance of the first support ( 12 ) is different. Slab formwork system with at least one drop head ( 10 . 142 ) according to at least one of the preceding claims. A slab formwork system according to claim 5 having a drop head according to claim 2, further comprising a slab formwork element (10). 30 ), the one with the on the support ( 12 ) of the case head ( 10 ) trained undercut ( 14 ) cooperating undercut ( 32 ) having. Slab formwork system according to claim 5 or 6, further comprising at least one slab formwork support ( 210 . 220 . 230 ) preferably made of steel, which is arched at least slightly in the direction of the concrete to be filled and / or openings ( 214 ) whose size and / or shape and / or orientation and / or distribution over the length of the carrier ( 210 . 220 . 230 ) and / or the carrier ( 210 . 220 . 230 ) in terms of its dimensions over the length is designed such that the carrier ( 210 . 220 . 230 ) is weakened less in a central region than in end regions (A). Slab formwork system according to claim 7, characterized in that in at least one opening ( 214 ) at least one bracket for supporting a further, preferably a wooden formwork support is suspended. Slab formwork system according to claim 7 or 8, characterized in that the slab formwork support is integrated in a formwork element, in particular panel. Ceiling formwork system according to one of claims 5 to 9, further comprising at least one ceiling formwork element ( 110 . 120 ) at least at one end ( 112 ) with at least two supports pointing in the same direction ( 114 . 116 . 130 . 132 ) is provided, which are arranged at substantially horizontal arrangement of the slab formwork element at different vertical heights that the slab formwork element ( 110 . 120 ) on at least two different horizontal levels on other elements ( 142 ) of a cover formwork system can be placed. Slab formwork system according to claim 10, characterized in that the higher support ( 114 ) is arranged closer to the end of the slab formwork element than the lower support ( 116 ). Slab formwork system according to claim 10 or 11, characterized in that at least one support ( 114 . 116 . 130 . 132 ) is at least partially made of metal and / or a fiber-reinforced plastic. Slab formwork system according to one of claims 10 to 12, characterized in that at least one support ( 114 . 116 . 130 . 132 ) is sleeve-shaped. Ceiling formwork system according to one of claims 10 to 13, characterized in that at least one support ( 130 ) below another support ( 132 ) can be folded in and out. Ceiling formwork system according to one of claims 5 to 14, with at least one slab formwork element with a plurality of carriers, of which at least two are spaced less in a central region of the formwork element than in end regions. Ceiling formwork system according to claim 15, with at least one shuttering panel with edge beams and cross beams between the edge beams, characterized in that only at least one cross member is curved. Ceiling formwork system according to one of claims 5 to 16, further comprising at least one bracket, which in at least one opening ( 214 ) of a formwork support ( 210 . 220 . 230 ) and suitable for laying at least one further formwork support, preferably a wooden formwork support.

Images