EP2443299A1

EP2443299A1 - Drophead for a ceiling formwork system and ceiling formwork system

Info

Publication number: EP2443299A1
Application number: EP11700659A
Authority: EP
Inventors: Walter Holawe
Original assignee: Doka Industrie GmbH
Current assignee: Doka Industrie GmbH
Priority date: 2010-01-20
Filing date: 2011-01-19
Publication date: 2012-04-25
Anticipated expiration: 2031-01-19
Also published as: WO2011089148A1; DE102010001042A1; DE102010001042B4; EP2458111A2; EP2443299B1; EP2458111A3

Abstract

The invention relates to a drophead (10) for a ceiling formwork system, comprising at least one lowerable support (12) for a ceiling formwork element (30), wherein the support can be pivoted out of the vertical projection of the ceiling formwork element (30) about a substantially horizontal pivot axis (34), such that the ceiling formwork element (30) can be lowered past the at least one pivotable support (12), and wherein the pivot axis (34) of the support (12) is disposed above the support (12). The invention further relates to a ceiling formwork system having such a drophead (10).

Description

Drop head for a slab formwork system and

Ceiling formwork system

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. Here, special heads for props are also known, between which formwork beams or

elements can be attached.

STATE OF THE ART

For example, DE 33 16 557 C1 discloses a

Slab formwork system with a drop head and a drop piece, which can perform a certain tilting movement.

From DE 10 2004 004 883 Al a Deckenschalungspaneel emerges, in which a support means at the end of the panel is so positionally adjustable 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 , DE 101 35 664 B4 relates to a support for

Ceiling formwork with a drop head, which is divided into two parts, wherein the two parts are mounted differently lower lowered on the support, and a part is rotatable about the support.

PRESENTATION OF THE INVENTION

The invention has for its object to provide a drop head and provided therewith a ceiling formwork system through which the necessary in the context of switching on and Ausschalens work can be performed safely and efficiently.

The solution of this problem is on the one hand by the case head described in claim 1. Consequently, this has at least one lowerable support for at least one

Ceiling formwork element which can be pivoted out of the vertical projection of the ceiling formwork element such that the ceiling formwork element on the at least one

pivotable support is lowered over. In other words, the support or drop piece of the drop head according to the invention is pivotable such that a

Ceiling formwork element such. B. a Deckenschalungspaneel or a slab formwork carrier by a movement next to the support and along this can be lowered. Under the above-mentioned "vertical projection" becomes the one room

understood, the ceiling formwork element in

Use position so largely horizontal, in the vertical direction, ie up and down, covering.

For this space, the ceiling formwork element usually in the context of lowering, so the Ausschalens not

stepping out. The reason for this is that in the described Ausschalens Although described the slab formwork elements can be removed because the concrete at this time already to a cured to a certain degree. 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 early on to another

Place of use, typically one to a floor higher ceiling, can be brought. Here, these elements, which are subject to special stress and pollution due to the frequent and changing use, not necessarily in the system according to the invention

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 swung out of the described vertical projection, the

Slab formwork elements are easily 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. Further, a support element is preferably provided, which the lowerable support in a first

Position at a higher level, and in a second

Position in which it was moved, for example, by a hammer blow, holding at a second, lower level. When the supports have been lowered, the ceiling formwork elements supported thereby can be removed in the manner described.

The swinging out of the described vertical projection is particularly simple in that a

Pivoting axis of the support is arranged above the support. This means that the support advantageously, for example, by means of the following

Undercut, by engaging with the

Ceiling form element can initially be pivoted upwards, and thereby comes out of the slab formwork element. In the subsequent lowering movement, the support can simultaneously from the vertical projection

be swung out.

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 and on which a suitable portion 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. When arranging the pivot axis of the support above the described undercut moves from the edge of the

Ceiling formwork element away and thus disengaged. As a result, the ceiling formwork element below

be lowered while the support, for example, by the pressure exerted by the slab formwork element when lowering on this, from the vertical projection of the

Slab formwork element is swung out.

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

proved. 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 directly adjoining the top plate of the drop head are to be closed (on at least two sides) by separate formwork elements. For this purpose, so-called cover strips or "small panels" have proved to be favorable, which can be lowered by a shortened path during stripping, thereby reducing the risk of damage. each resting on the top plates of the drop heads, in other words forming the

Head plates themselves no 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 to the

complete curing only occasionally or

is supported strip-shaped, remain the described

Cover strips first in place. If later the supports are to be removed, this is not possible for two supports at the same time, on those two

Also remove columns supporting cover strip.

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 standing 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 benefits, 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, previously as small panels or cover strips

are easily ausschalbar, since they from the

lowered drop heads parallel to the freshly created

Concrete ceiling can be removed laterally.

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 are one or more props and one or more

Ceiling formwork elements, in particular carrier or panels called.

In an advantageous manner, the undercut provided on at least one support can cooperate with an undercut on at least one slab formwork element such that the slab formwork element is secured against unwanted lifting on the one hand and can be disengaged from the undercut of the support during stripping, and finally on can be removed past the swiveled 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 can be any other

suitable material, such. As wood, aluminum or

having fiber reinforced plastic. Especially at

However, steel beams is a particular challenge in the carrier or more such carriers that can be integrated into a formwork element continues

to be able to manipulate. In other words, the carrier as much as possible to save weight, while at the same time Strength requirements must be met. 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 taken up particularly well, in particular without the risk of bending against the direction of curvature, which in the finished concrete pavement leads to undesired bulges or The described curvature 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 carrier may have openings

whose size and / or shape and / or orientation and / or distribution varies over the length of the carrier such that the carrier is less weakened in a central region than in at least one end region.

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, while the possibilities of

Weight savings are used that the carrier with

Apertures is provided, which are either increasingly smaller and / or less in the central region. Here, the openings over the entire carrier a largely

constant shape, for example circular, have, but are smaller towards the center. Alternatively or

In addition, it is conceivable that the shape and / or

Alignment of the openings in the direction of the center changed so that here a smaller weakening occurs. 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 measures described or a combination thereof can be

especially on a steel beam extensive weight

save, and at the same time let the

To meet strength requirements in an advantageous manner.

This applies equally to the measure according to which the support itself is designed in terms of its dimensions over the length such that it is in a middle

Less weakened area than in at least one

End. This can be done, for example

accomplish that the carrier, in one

Sectional view gives the impression of a "portrait" arrangement, in the middle area "higher" 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.

In view of the versatility of the

Ceiling form carrier, it has proven to be advantageous to form at least one opening such that therein

at least one bracket for supporting another, preferably a wooden formwork support is suspended. 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

Slab formwork system according to the invention favorable. It should be noted that for the hanging of the described strap a regular arrangement, in other words a kind of grid, of possibly the same size and / or uniform

Openings is conceivable. In particular, such is

Embodiment, optionally in combination with one or several of those described above or below

Characteristics, as well as the use of at least one opening in a slab formwork carrier for hanging at least one strap for receiving a further, preferably a wooden formwork support to be regarded as the subject of the present application. 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) is approximately the width of a carrier (also viewed from above,

measured perpendicular to the longitudinal extent of the carrier)

equivalent. At this floor can be two legs

be mounted on different sides, so that they extend in use largely vertically to different sides of the formwork support. By mutually directed, but offset by the length of the bottom projections or hooks of the bracket can for example in two

adjacent openings of a formwork support mounted and for laying one or more

Wooden formwork beams are used. So far, it has been known to provide formwork supports laterally strip-shaped projections over substantially the entire length of the carrier, which have at its end an increase, so that the

described bracket can be hung. 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 beam alone develops its advantages, but it can be advantageously integrated into a formwork element, in particular panel, and such an element may comprise several of the

have described slab formwork, so that the benefits described can be used in a special way for a formwork element. For the flexible usability of the formwork support is moreover preferred that it is provided at least at one end with at least two directed in the same direction (usually vertical) 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. As such, the one described herein

Formwork supports not necessarily always as

Slab formwork provided, 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, for example, by a suitable

Wood insert, is nailbar, consists by the directed in the same direction the advantage that these

Nailability is for 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 laid on a first, lower one

Arrange level. Also by using the higher one

Auflagers can be further formwork support, for example, apply transversely to the formwork supports mentioned above, and are then at the same vertical level as formwork beams, which are used immediately using their "lower" support, and thus are "higher". In particular, can the

Slab formwork carrier hereby as "transitional support", For example, to areas where another slab formwork system is used, or use as "edge support", for example, to existing walls, to make here the "correct" level of formwork.

Here it is for the handling of the

Slab formwork carrier proved to be advantageous when the higher support is located closer to the end of the slab formwork carrier, as the lower support. In other words, the "height" of the slab formwork carrier decreases towards the end, which is similar to that already described above

Form change of the carrier along its length is accompanied, and also provides a simple procedure when hanging up.

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 further preferred for at least one support that it is sleeve-shaped. Such a shape forms a largely vertical

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 under a first support a second support and supply 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 arranged in a middle region of the frame

Panels are less spaced 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

Shuttering element proved to be particularly favorable, in which any edge support are not curved, and this measure only for at least one particularly stressful

Cross member is used between the edge beams.

Finally, it should be mentioned that all the above and below described individual elements of a

Ceiling formwork system, in particular also the bracket and the cover strip, alone, with any combination of the features described herein and any combination of the individual elements are to be regarded as an object of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is based on a in the

Drawings illustrated embodiment closer

explained. Show it:

Fig. 1 is a perspective view of an inventive

Case head; Fig. 2 is a side view of the drop head according to the invention with an already lowered

Slab formwork panel;

Fig. 3 shows a detail of Fig. 2 when lifting the

Slabs element;

Fig. 4 shows a detail of Fig. 2 when lowering the

Slab formwork panels;

Fig. 5 is a perspective bottom view of a corner of a

Slab formwork panels;

6 is a perspective view of one end of a

Slabs carrier;

Fig. 7 is a perspective view of a column head with a launched in a first state

Carrier according to Fig. 6;

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

Fig. 9 is a schematic view of a in a

Shuttering panel integrated support;

10 shows a further embodiment of a carrier; and

11 shows a still further embodiment of a carrier.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

The drop head 10 shown in FIG. 1 has at its (in the position of use shown) lower end substantially a tube piece 20, with which it in the upper end of a Bracket insertable and attachable to this. At its upper end, the drop head 10 is provided with a head plate 22, 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, the movement of the pivotable described below

Auflagers limited, especially in the last

Panel row, if only one of two jointly pivotable supports is occupied, is useful. Especially in this situation, those described in more detail below

Because of the one-sided load, pivot plates 24 tend to pivot completely downwards. 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 serves as a stop for the panel 30. In particular, with one-sided loading, the dead weight of the panel 30 causes (see Fig. 2) pivoting of the pivot plate 24 (according to the situation shown in Fig. 2 in the clockwise direction) is effected. Due to the arrangement of the pivot point of the pivot plate 24 above the same moves a pivoting of the pivot plate 24, the shuttering panel 30 in the direction of the drop head 10. Das

Schalungspaneel 30, however, strikes the (largely vertically downwardly extending) side surfaces of the

Head plate 22, so that the pivoting movement of the

Swing plate 24 is stopped. The formwork panel 30 can thus, as described in more detail below, first be held securely and then removed.

Somewhat below the top plate 22 is shown in the

Embodiment a so-called second support 18th

provided, which serves in this embodiment for laying a (not shown) cover strip whose width in

Substantially the width of the top plate (measured from bottom left to top right of FIG. 1} corresponds. The support 18 is lowered in the embodiment shown by a smaller distance than the support 12 described in more detail below.

In the embodiment shown, two are each

opposite supports 12 at a common

Swivel plate 24 is formed so that at these supports in each case the corners of two opposite (not

shown) slab formwork panels can be placed. Between the two at the front, tilted drawn swivel plate 24 launched slab formwork panels located in the position of use, the lying on the support 18 cover strip.

In addition, according to the illustration of Fig. 1 behind the with

Reference number provided pivot plate 24 is another such pivot plate, so that two

Slab formwork panels on the left front side of the

Head plate 22 can be arranged with system to each other. In many arranged in this way

Ceiling formwork panels and cover strips can be one

Concrete pavement to be poured. As part of the Ausschalens the securing member 26 is displaced in a substantially horizontal direction so that it is disengaged from a suitable portion of the drop head and falls down to the base plate 28. As a result, the pivot plates 24 and any overhead formwork panels are also

lowered.

This position is shown in FIG. The

Deckenschalungspaneel is designated 30 and is still in the situation shown on the support 12. In the embodiment shown, the support 12 has a substantially vertical pin 16 which extends upwardly and has an undercut 14 in the form of a (better visible in Fig. 3) projection. These

Undercut acts with an undercut 32 (see. Fig. 3) on the slab formwork panel 30 together such that the slab formwork panel 30 is secured in the position of use in an advantageous manner against lifting. In this case, the projection of the undercut 14 projects substantially into the space formed above the undercut 32.

In Fig. 3 is shown how the described

Undercuts now to lower the

Deckenschalungspaneels 30 can be disengaged. This is advantageously possible because a pivot axis 34 (see Fig. 2) of the support 12 is located above it. As a result, if that

Deckenschalungspaneel 30 from the ground, for example, by means of a suitable rod is slightly raised, and formed therein undercut 32 via the formed on the pin 16 undercut 14, the pivot plate 24 of the support 12 raises, the undercut 14 due to the rotational axis disposed above 34 (see Fig. 2) moves away from this, and thus gradually disengaged. In particular, the movement shown in Fig. 3 can be continued so far without displacing the slab form panel in the horizontal direction that the

Undercuts completely disengage, and essentially the horizontally projecting plate, which forms the undercut 32 on the Deckenschalungspaneel 30, is disposed above the pin 16. this applies

In particular, when the pivot plate 24 is suspended, and is largely aligned horizontally.

Subsequently, the slab formwork panel, still from the ground, by a worker with a suitable

Rod supported and drained down, so that, as shown in Fig. 4, press portions of the slab form panel on top of the pin 16 that the pivot plate 24 is pivoted so that the support 12 sufficient from the vertical projection of the slab formwork element 30th

is swung out. In other words, that moves Support including the pin as shown in Fig. 4 to the left, so that 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 Deckenschalungspaneels 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, may be provided.

FIG. 5 shows a corner of a formwork element in the form of a slab formwork panel 110. The corner 112 thus forms an end in the sense of the preceding description.

In particular at the edges and at the corners 112, the shuttering panel 110 has beams or profiles, preferably

Metal, in particular steel, on, which define a peripheral edge in the case shown, the (flat) space

defined, in which a formwork panel 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 corner 112 shown in FIG

The basic idea of the invention is two supports 114, 116

intended. In the case shown, both are largely sleeve-shaped, i. closed on at least three sides, and extend differently from that by the

Shuttering plate formed (in use position upper) end of the formwork element. As a result, the formwork panel 110 is at two different levels on suitable other elements of a slab formwork system, such as columns or their heads can be placed. In the case shown, the higher support 114 is closer to the corner 112 than the lower support 116, which provides handling benefits. Due to the sleeve-like shape of the two supports 114, 116, the supports can cooperate with suitable counter-elements, for example pins, and are thereby secured against displacement in all horizontal directions. Incidentally, the formwork panel 110 described above may correspond to the panel 30 described with reference to FIGS. In particular, the panel shown in FIG. 5 can have the undercut described with reference to FIGS. 2 to 4 on at least one corner and in at least one support.

The horizontal fuse is similarly in the formwork element shown in Fig. 6 in the form of a

Formwork support 120 of the case, in which, however, a lower support 130 is openable and folded away. The lower 130 and the upper supports 132 are in turn provided with a vertically extending cavity, which in this case is bounded 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 can be seen in Fig. 6, the lower support 130 is one below the

Auflagers 132 axis 134 pivotally, so that it is placed in the folded state, so to speak, in the web 136 of the carrier 120, and does not affect the operational capability of the upper support 132. The formwork support shown in FIG. 6 has the particular advantage that the two supports 130, 132 are directed in the same direction. As a result, for example, at the

Top of the carrier 120 inserted wooden insert 138 for attaching shuttering panels by means of nails

Use of both supports 130, 132 usable. Thus, the formwork support 120 is always flexible usable

Ceiling formwork element. In Fig. 7 is shown as the formwork beam 120 with

Use of the lower support 130 can be placed on a support head 140, which corresponds to the support head 10 of FIGS. 1 to 4. In particular, the formwork support 120 can be placed on a journal of the same such that the

Top edge of the formwork support 120 is at a level with the top plate 142 of the support head 140. As a result, formwork panels can be placed on the carrier 120 and the top plate 142. Alternatively, the dimensions may be selected such that the upper edge of the formwork support 120 is located about the thickness of a formwork panel below the top plate 142, so that the shell formwork produced by both on the support 120 laid formwork panels and the

Head plate 142 itself is formed. In particular, in this case, the formwork support 120 can 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 each support heads 142 has, and a region, for example, by using a

Wooden formwork system with wooden beams and individually

cut formwork panels is geschalt. To the

Shuttering panels not only on the described wooden beams, but at the transition to the top in the first place

described formwork system can be placed on an element of this system, the formwork support 120 shown can be used advantageously. In the

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 advantageously used the above described in an opening of a formwork support hook hangable. The advantageous use of the formwork support 120 applies in a similar manner at the edges of a

Formwork system comprising prefabricated formwork elements. On the edges, for example, towards walls, often individually tailored formwork panels or boards must be used, which can be placed in an advantageous manner on the formwork support 120 described, which then acts as edge support.

Further, as shown in FIG

Formwork beams 120 a grid of yoke and cross beams are formed. In order in such an application, the Jochträger 122 on the respect to the top plate 142nd

To bring "right" level, both in the

Cross members 122 and the yoke beams 124, the upper

Support 132 used. The yoke brackets 124 are thus at a lower level (compared to Fig. 7), and the cross beams 122 placed on the yoke brackets 124, as shown, then form the "right" level with respect to the top plate 142. This may be as above

described to act at the same level, so that

Shuttering panels on the top plate 142 and the cross member 122 can be placed in cooperation. Alternatively, the cross members 122 may be located about the thickness of a formwork panel below the top plate 142 so that the formwork panels placed on the crossmembers 122 form a unitary level with the top panels 142 and the formwork panel is formed entirely by these two elements in cooperation with one another ,

In Fig. 9 is exaggerated in a side view and in view of the curvature shown an advantageous carrier 210, which in the example shown in a

Shuttering element is integrated, of which, however, only edge profiles 212 are shown. In the final state is above the profiles 212 and the carrier 210 a

Shuttering board 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 this load in the form of a kind of bias counteract, is the carrier according to the invention in the embodiment shown in Fig. 9 in the direction of

expected load arched. This curvature is exaggerated in Fig. 9 for clarity, but in practice, depending on the length of the carrier, a few millimeters. The carrier shown in FIG. 9 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 does not necessarily have to be provided for the edge carriers or profiles 212. In the embodiment shown in Figure 9, moreover, apertures 214 are shown which are unevenly distributed throughout the length of the carrier.

In the embodiment shown in Fig. 10, such apertures 214 are varied over the course of the carrier 220 in terms of their size according to an alternative measure, but which can be combined with the curvature shown in Fig. 9. 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 third embodiment of a carrier 230 shown in Fig. 11, which is additionally made less "high" in the end regions A (according to the position of use) than in a central region. Over the course of the carrier 230 is further provided with openings whose shape,

Alignment and distribution varies over the length of the carrier. In the example shown, in the end regions openings in the form of a respective comparatively flat

Triangle provided, whose corners with different Radii are rounded. In the example shown, two sides of the triangle are substantially parallel to edges of the triangle

The radius of curvature is greatest towards the end of the beam and smallest at the top, towards 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, for the example shown a particular distribution, shape and orientation change of the openings could be found that weight can be saved and at the same time the strength over the entire course of the wearer

is guaranteed. The measures on a carrier described above with reference to FIGS. 9 to 11 can be realized, for example, on the carriers shown in FIGS. 6 to 8, and / or carriers with one or more of these measures can be incorporated into a shuttering panel 30 of FIG. 2 to 4 or 110 of FIG. 5 are integrated.

Claims

claims

1. drop head (10, 142) for a slab formwork system with at least one lowerable support (12) for a

Ceiling formwork element (30, 112, 120 to 124), wherein the support 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)

herausschwenkbar is that the slab formwork element (30, 112, 120 to 124) on the at least one

pivotable support (12) is lowered past, and wherein the pivot axis (34) of the support (12) above the support (12) is arranged.

2. drop head according to claim 1,

By doing so, that is

at least one support (12) at least one in vertical

Direction acting undercut (14).

3. drop head according to claim 2,

By doing so, that is

the undercut (14) is formed on a substantially vertically oriented pin (16).

4. falling head according to one of the preceding claims,

further comprising at least a second support (18) which can be lowered by a distance that is different from a

Absenkdistanz the first support (12) differs.

5. slab formwork system with at least one drop head (10, 142} according to at least one of the preceding claims.

6. slab formwork system according to claim 5 and 2, further comprising a slab formwork element (30), one with the on the support (12) of the drop head (10) formed Undercut (14) cooperating undercut (32).

7. slab formwork system according to claim 5 or 6, further comprising at least one slab formwork beam (210, 220, 230) preferably made of steel, at least slightly in

Direction of the concrete to be filled is curved and / or openings (214) whose size and / or shape and / or orientation and / or distribution over the length of the carrier (210, 220, 230) so changed and / or the carrier ( 210, 220, 230) in terms of its dimensions over the length is designed such that the carrier (210, 220, 230) in a middle

Less weakened area than in end areas (A).

8. slab formwork system according to claim 7,

By doing so, that is

in at least one opening (214) at least one bracket for supporting another, preferably a wooden formwork support is suspended.

9. slab formwork system according to claim 7 or 8,

By doing so, that is

the slab formwork support is integrated in a formwork element, in particular panel.

10. Ceiling formwork system according to one of claims 5 to 9, further comprising at least one ceiling formwork element (110, 120) which is provided at least one end (112) with at least two directed in the same direction supports (114, 116, 130, 132) that at largely

horizontal arrangement of the slab formwork element are arranged 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.

11. slab formwork system according to claim 10,

By doing so, that is

the higher support {114) closer to the end of the

Ceiling formwork element is arranged as the

lower supports (116).

12. slab formwork system according to claim 10 or 11,

By doing so, that is

at least one support (114, 116, 130, 132) is at least partially made of metal and / or a fiber-reinforced plastic.

13. slab formwork system according to one of claims 10 to 12,

By doing so, that is

at least one support (114, 116, 130, 132) is sleeve-shaped.

14. Ceiling formwork system according to any one of claims 10 to 16, characterized in that e

at least one support (130) below another support (132) and can be folded away.

15. Slab 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.

16. slab formwork system according to claim 15, with at least one shuttering panel with edge beams and cross beams between the edge beams,

By doing so, that is

only at least one cross member is curved.

17. slab 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) can be suspended and for laying at least one further formwork support, preferably a wooden formwork support suitable ,