EP3857002B1 - Stay head, ceiling stay, ceiling formwork and method for erecting such a ceiling formwork - Google Patents

Description

The invention relates to a prop head for a slab prop for a slab formwork with a connection element and a displacement element. The invention further relates to a ceiling support with such a support head, a ceiling formwork with such a ceiling support and a method for erecting such a ceiling formwork.

It is known to use formwork elements for the production of concrete ceilings. In particular, frame panel formwork elements are used, which at least partially form a mold for filling in liquid concrete. After the concrete has hardened, the formwork elements are removed.

The formwork elements are supported by ceiling props, with a prop head of the ceiling prop supporting a carrier bar of the ceiling formwork with the formwork elements. In FR 3 027 932 A1 describes an assembly of a foldable cantilever working structure and at least one support strut, the foldable structure comprising a frame intended to be mounted on a vertical wall of a building and at least one foldable support foot connected to the frame and intended therefor is to lean on the vertical construction wall. The assembly includes at least one connecting device connecting the frame to the strut, which is articulated along an axis between a folded storage position in which the strut extends horizontally and an unfolded use position in which the strut extends vertically. In the incremental launching process, e.g. B. in bridge construction, internal props must be dismantled while the floor formwork is being moved into a new concreting section, especially as part of a drawer solution for concreting the roadway slab, in order to be able to drive over obstacles such as bulkheads in a trough. This is necessary in particular when a folded-up prop protrudes so far from the carrier bolt that a bulkhead cannot be driven over.

In contrast, the object of the present invention is to create a prop head, a slab prop and a slab formwork with such a slab prop, in which the prop head can be used compactly and easily, in order to disassemble the slab prop with the prop head in favor of folding up the slab prop even in tight spaces to avoid. The object of the invention is also to provide a method for erecting such a ceiling formwork.

According to the invention, this object is achieved by a support head having the features of patent claim 1 and by a method according to patent claim 17 . The subclaims indicate appropriate developments.

The object according to the invention is thus achieved by a prop head for a slab prop for a slab formwork, which comprises a connecting element with first and second connecting surfaces facing away from one another, the first connecting surface being connectable or connected to a formwork prop and the second connecting surface having first guide means for guiding a opposite Connecting element has movable displacement element. The support head also includes the displacement element, which can be arranged between a carrier bar, for example in the form of a double U profile, the ceiling formwork and the connection element and has second guide means. The first and second guide means interact in such a way that when the support head is in the loaded state in a first displacement position, the first and second guide means form an axis below the carrier bar about which the displacement element can be tilted by a first angle relative to the connection element. In the unloaded state of the support head when the displacement element is in contact with the carrier bar, the connecting element can be displaced from the first displacement position into a second displacement position essentially perpendicularly to the longitudinal direction of the carrier bar and transversely to the carrier bar in a plane defined by the first connection surface with a normal vector in Load introduction direction in the loaded state displaceable, wherein the connecting element in the second displacement position relative to the Displacement element is rotatable through a second angle which is greater than the first angle, in particular through the second angle of at least 90 degrees.

According to the invention, the displacement element is connected to the connecting element in a displaceably guided manner. As a result, the sliding element can be attached to the carrier bar, for example a steel bar SRU with a double U profile from PERl, with a simply released and compact folding mechanism in the unloaded state, for example transverse to the carrier bar, with a low construction height of the support head. In the loaded state, the axis below the girder allows an inclination compensation around the first angle to at least partially avoid an eccentric load introduction into the ceiling support.

Since the axis is displaced by the second angle in the unloaded state compared to the axis by the first angle in the loaded state by the distance between the first and second displacement position, the connecting element can be displaced in the second displacement position relative to the displacement element in such a way that there is increased freedom from collisions of the displacement element relative to the connection element, the second angle is significantly larger than the first angle, for example 90 degrees or more.

• kompakte Bauform mit geringem Gewicht bei hoher Tragfähigkeit,
• kostengünstige Lösung wegen des einfach aufgebauten Aufbaus des Stützenkopfs,
• einfaches Wirkprinzip der Drehung des Verschiebeelementes gegenüber dem Anschlusselement im belasteten Zustand in der ersten Verschiebeposition und unbelasteten Zustand in der zweiten Verschiebeposition ohne komplexen, verschmutzungsanfälligen Mechanismus,
• Schwenkfunktion im unbelasteten Zustand mit geringer Aufbauhöhe. Dies ermöglicht auch bei großen innenliegenden Hindernissen eine Vermeidung einer Stützendemontage,
• einfaches Arretieren der an dem Stützenkopf angebrachten Schalungsstütze in horizontaler Lage, z.B. mithilfe einer (Draht-) Schlaufe, an dem Verschiebeelement oder dem Trägerriegel der Deckenschalung,
• durch Neigungsausgleichsfunktion im belasteten Zustand keine exzentrische Lasteinleitung über den Stützenkopf in die Deckenstütze aufgrund geneigter Bauwerksgeometrie bzw. Unebenheiten,
• nur geringfügige Lastreduzierung der Deckenstütze durch zusätzliche statische Höhe des erfindungsgemäßen Stützenkopfs mit minimaler Erhöhung der Knicklänge aufgrund dessen kompakter Bauform,
• die Deckenstützen müssen nicht aufwändig demontiert und nach dem Verziehen der Deckenschalung wieder montiert werden und können stattdessen aufgrund des kompakten Stützenkopfs und des einfachen Klappmechanismus des Anschlusselementes mit der Schalungsstütze gegenüber dem Verschiebeelement in der zweiten Verschiebeposition hochgeklappt werden. Dies führt gegenüber einer Demontage der Deckenstützen zu einer Erhöhung der Taktgeschwindigkeit beim Taktschiebeverfahren,
• die Deckenstützen bleiben wegen der Anlage des Verschiebeelementes an dem Trägerriegel ohne Demontage immer an ihrer statisch vorgesehenen Position. Dies minimiert ein Risiko für Fehlanwendungen beim Taktschiebeverfahren,
• durch die geringe Aufbauhöhe dieser Klapplösung im unbelasteten Zustand können auch große Hindernisse im Trog, z. B. innenliegende Schottwände, Lagerkästen für Spannglieder, etc., kollisionsfrei überfahren werden, wobei die hochgeklappten Deckenstützen mit den erfindungsmäßigen Stützenköpfen nicht über das Fahrträgerniveau ragen.

The advantages of the prop head according to the invention can be summarized as follows:

• compact design with low weight and high load capacity,
• cost-effective solution due to the simple structure of the prop head,
• simple operating principle of the rotation of the displacement element in relation to the connecting element in the loaded state in the first displacement position and in the unloaded state in the second displacement position without a complex mechanism susceptible to contamination,
• Pivoting function in the unloaded state with a low installation height. This makes it possible to avoid dismantling the support even if there are large internal obstacles,
• Simple locking of the formwork prop attached to the prop head in a horizontal position, e.g. using a (wire) loop, on the sliding element or the beam waler of the slab formwork
• due to the inclination compensation function in the loaded state, no eccentric load introduction via the prop head into the slab prop due to inclined building geometry or unevenness,
• only slight load reduction of the ceiling support due to the additional static height of the support head according to the invention with a minimal increase in the buckling length due to its compact design,
• the slab props do not have to be laboriously dismantled and reassembled after the slab formwork has been moved and can instead be folded up in the second displacement position due to the compact prop head and the simple folding mechanism of the connection element with the formwork prop in relation to the sliding element. Compared to dismantling the floor props, this leads to an increase in the cycle speed for the incremental launching process,
• the ceiling props always remain in their statically intended position due to the installation of the sliding element on the carrier bar without dismantling. This minimizes the risk of incorrect use in incremental launching,
• Due to the low construction height of this folding solution in the unloaded state, large obstacles in the trough, e.g. B. internal bulkheads, storage boxes for tendons, etc., are run over without collision, the folded-up ceiling props with the inventive prop heads do not protrude beyond the level of the traveling beam.

Advantageously, the axis formed in the loaded state of the prop head in the first displacement position runs below the support bar as a first axis essentially in a longitudinal direction of the support bar for longitudinal inclination compensation, the prop head also comprising a contact element for contacting the support bar of the ceiling formwork, which is connected to the Sliding element is connected in one piece or detachably and is rotatably connected to the support bar in the applied state about a third axis running substantially perpendicular to the longitudinal direction of the support bar for a transverse inclination compensation. According to the invention, in the unloaded state of the support head when the displacement element is in contact with the carrier bar, the connection element can be displaced from the first displacement position into the second displacement position essentially perpendicularly to the longitudinal direction of the carrier bar, with the connection element in the second displacement position being in particular in relation to its position in the loaded state of the Support head is rotatable by the second angle of at least 90 degrees.

Since the connection element can be displaced from the first displacement position into the second displacement position essentially perpendicularly to the longitudinal direction of the carrier bar, the displacement element can, according to the invention, be displaced transversely to the carrier bar in a plane defined by the first connection surface with a normal vector in the direction of load application in the loaded state to the connection element will. Since displacements of the displacement element relative to the connection element in the direction of load introduction are essentially avoided, the structural height can be reduced or minimized in the essentially vertical direction in the loaded state.

Because the first and second axes are essentially perpendicular to one another in the loaded state, the support head in this embodiment has a cardan joint-like or cardan joint-like construction. In addition to compensating for longitudinal inclinations, e.g. B. a bridge or another structure, additional compensation for transverse slopes without introducing eccentric loads into the ceiling support.

Ideally, the first axis formed in the loaded state of the prop head in the first displacement position is centered below the contact element, i.e. essentially in the load introduction direction, in order to avoid introducing an eccentric load into the ceiling prop.

As already mentioned, the first axis running essentially in the longitudinal direction of the carrier bar and the one third axis running essentially perpendicular to the longitudinal direction of the carrier bar advantageously form a cardan joint. In many applications it is sufficient and advantageous for a small body height if the first axis has a longitudinal inclination compensation with the first angle of approx. +/- 4 degrees and the third axis a transverse inclination compensation with a third angle of approx. +/- 4 degrees permitted.

In the applied state, the third axis running essentially perpendicularly to the longitudinal direction of the carrier bar is advantageously formed by a pin which is inserted through two recesses lying opposite one another essentially perpendicularly to the longitudinal direction of the carrier bar. The pin can have a conical shape and/or be secured against unintentional release from the contact element and/or the carrier bar by a cotter pin that can be reversibly inserted into the pin.

In one embodiment, the carrier bar can consist of at least two mutually essentially parallel and spaced apart profiles of essentially the same height, in particular of a double U-profile with U-profiles facing away from one another with a spacer rail present on one side of the double U-profile between the U-profiles, for example made of steel as a steel bar, wherein when the contact element is in place, a height of the contact element corresponds to the height of the profile, in particular a height of the U-profile minus the thickness of the spacer rail and/or a width of the contact element width of Spacer bar, corresponds. In this way, not only is a form-fitting contact of the contact element in and/or on the carrier bar ensured, but also a low construction height of the support head, since the contact element is almost or completely arranged in the contact element in the carrier bar and is therefore "sunk in".

The displacement element and the contact element connected to the displacement element advantageously form a T-piece and/or pipe piece.

In this embodiment, the support head according to the invention can essentially consist of a pipe T-piece that can be manufactured inexpensively and yet stably and easily. In the loaded state, the sliding element forms the horizontally aligned "lying" arm of the upside down T and the contact element forms the vertically aligned "upright" arm of the upside down T.

In the loaded state of the support head, one side of the displacement element, on which the second displacement position is located, is preferably aligned with an outer edge of the carrier bar, in particular an outer edge of a leg of the double U-profile of the carrier bar, when the axis formed in the first displacement position is centered below of the carrier bar is arranged.

The connecting element can be designed as a head plate with first and second connecting surfaces parallel to one another and with at least two lugs lying opposite one another in the longitudinal direction of the carrier bar as components of the first guide means on the second connecting surface. In this way, the formwork prop can be swiveled up, for example, transversely to the girder with a small construction height, because the connecting element, which is designed as a head plate (with the formwork prop connected to it), for example, is pushed in the second displacement position out of a collision area of the girder by moving it from the first to the second displacement position before the formwork prop is folded/rotated upwards.

For the sake of simplicity and stability, the displacement element preferably has, as a second guide means, a recessed guide channel that extends from one side to the other side of the displacement element, at the ends of which the first and second displacement positions are located, the first guide means having a web, for example in the form of a Screw or rivet include, which extends from one tab through the guide channel to the other tab. Alternatively, the displacement element has, as a second guide means, on two opposite sides of the displacement element recessed guide channels arranged parallel to one another, at the ends of which the first and second displacement positions are located, the first guide means having a web on each bracket, for example in the form of a screw or rivet, which engages in the guide channel facing the respective tab.

When designed as a tubular T-piece, the support head can, according to the second alternative, consist of a guideway on two opposite sides of the sliding element in the loaded state in the longitudinal direction of the carrier bar, a head plate with tabs and two first and third axes arranged perpendicular to one another. The recessed guide track in the pipe T-piece enables pivoting up transversely to the girder with a small construction height, because the connection element designed as a head plate with the formwork prop connected to it can be pushed out of a collision area of the girder according to the above embodiment before the formwork prop is folded up. Such an embodiment is shown below in the figures.

The connecting element can also have lugs as first guide means, which have a guide channel from one side of each lug to the other side of each lug, at the ends of which the first and second displacement positions are located, the second guide means of the displacement element having a web, for example in the form of a screw or rivet, which engage at its opposite ends in the guide channels formed by the tabs. Alternatively, the connection element can also have tabs as the first guide means, which from one side of each tab to the have a guide channel on the other side of each tab, at the ends of which the first and second displacement positions are located, the second guide means of the displacement element on each side facing the tabs comprising a web, for example in the form of a screw or rivet, which is in the respective guide channel of each tab engages.

The first or second guide means advantageously have a recess running essentially in the longitudinal direction of the carrier bar in the side of the guide channel facing the carrier bar or furrows running essentially in the longitudinal direction of the carrier bar in the side of the guide channels facing the carrier bar, in order in the loaded state of the support head to form the axis formed in the first displacement position below the carrier bar. Such an embodiment is shown below in the figures.

In the second displacement position, the connection element can advantageously be locked on the displacement element or on the carrier bar, rotated by the second angle in relation to the displacement element, for example by means of a wire, in particular steel wire.

Also covered by the present invention is a floor prop with the prop head according to the invention and the formwork prop arranged on the prop head.

A ceiling formwork with the ceiling prop according to the invention and the carrier bar arranged on the ceiling prop also belongs to the invention. In the case of the ceiling formwork, the carrier bar can be designed as a double U-profile with U-profiles facing away from one another with a spacer rail between the U-profiles on one side of the double U-profile, in particular made of steel as a steel bar.

The object is also achieved by a method for erecting a ceiling formwork as described above. It comprises a formwork surface, which is composed of several formwork elements, with at least two ceiling props according to the invention are used. The prop heads of the ceiling props are each loaded by being placed against the support bar and in the first displacement position the first and second guide means of the connection element of each prop head form the axis below the support bar. The prop heads are relieved by moving the connection element of each prop head downwards relative to the carrier bar and the respective connection element is shifted from the first displacement position to the second displacement position, rotated into a substantially horizontal position and locked on the respective displacement element or the carrier bar.

According to the invention, it is therefore provided to use the same ceiling props according to the invention for supporting all or at least some areas of the formwork surface of the ceiling formwork.

Fig. 1

eine perspektivische Ansicht des erfindungsgemäßen Stützenkopfs;

Fig. 2

eine perspektivische Ansicht einer Deckenstütze mit dem Stützenkopf aus Fig. 1 an dessen oberen Ende;

Fig. 3a

eine Seitenansicht des Stützenkopfs aus Fig. 1 mit halbtransparent dargestelltem Anschlusselement;

Fig. 3b

eine perspektivische Ansicht des Stützenkopfs aus Fig. 3a,

Fig. 4a

eine Vorderansicht des erfindungsgemäßen Stützenkopfs in belastetem Zustand mit verbundener Schalungsstütze und verbundenem Trägerriegel, wobei der Trägerriegel in halbtransparenter Seitenansicht dargestellt ist;

Fig. 4b

eine Seitenansicht des erfindungsgemäßen Stützenkopfs in belastetem Zustand mit verbundener Schalungsstütze und verbundenem Trägerriegel, wobei der Trägerriegel in halbtransparenter Querschnittsansicht dargestellt ist;

Fig. 5a

eine gegenüber Fig. 4b um 180 Grad gedrehte Seitenansicht des erfindungsgemäßen Stützenkopfs in belastetem Zustand mit verbundener Schalungsstütze und verbundenem Trägerriegel, wobei der Trägerriegel mit einer Deckenschalung verbunden ist;

Fig. 5b

eine Seitenansicht des erfindungsgemäßen Stützenkopfs aus Fig. 5a in entlastetem Zustand in der ersten Verschiebeposition;

Fig. 5c

eine Seitenansicht des erfindungsgemäßen Stützenkopfs aus Fig. 5a in entlastetem Zustand in der zweiten Verschiebeposition;

Fig. 5d

eine Seitenansicht des erfindungsgemäßen Stützenkopfs aus Fig. 5a in entlastetem Zustand in der zweiten Verschiebeposition mit hochgeklappter Schalungsstütze;

Fig. 5e

eine perspektivische Ansicht des erfindungsgemäßen Stützenkopfs gemäß Fig. 5d;

Fig. 6a

eine Querschnittsansicht einer Brücke mit einer Deckenschalung mit zwei erfindungsgemäßen Deckenstützen in belastetem Zustand;

Fig. 6b

eine vergrößerte Ansicht des in Fig. 6a dargestellten Stützenkopfs in einer Vorderansicht;

Fig. 6c

eine Querschnittsansicht der Brücke gemäß Fig. 6a, wobei die zwei mit dem erfindungsgemäßen Stützenkopf verbundenen Schalungsstützen hochgeklappt sind; und

Fig. 6d

eine vergrößerte Ansicht des in Fig. 6c dargestellten Stützenkopfs in einer Vorderansicht.

Further features and advantages of the invention result from the following description of several exemplary embodiments of the invention, from the patent claims and from the figures of the drawing, which show details essential to the invention. The features shown in the drawing are presented in such a way that the special features according to the invention can be made clearly visible. In the figures, the same reference symbols designate the same or corresponding elements. Show it:

1

a perspective view of the support head according to the invention;

2

a perspective view of a ceiling prop with the prop head 1 at its upper end;

Figure 3a

a side view of the support head 1 with connection element shown semi-transparent;

Figure 3b

a perspective view of the support head Figure 3a ,

Figure 4a

a front view of the prop head according to the invention in the loaded state with connected formwork prop and connected carrier bar, wherein the carrier bar is shown in a semi-transparent side view;

Figure 4b

a side view of the prop head according to the invention in the loaded state with connected formwork prop and connected carrier bar, wherein the carrier bar is shown in a semi-transparent cross-sectional view;

Figure 5a

one opposite Figure 4b 180 degree rotated side view of the prop head according to the invention in the loaded state with connected formwork prop and connected carrier bar, the carrier bar being connected to a ceiling formwork;

Figure 5b

a side view of the support head according to the invention Figure 5a in the unloaded state in the first displacement position;

Figure 5c

a side view of the support head according to the invention Figure 5a in the unloaded state in the second displacement position;

Figure 5d

a side view of the support head according to the invention Figure 5a in the unloaded state in the second sliding position with the formwork prop folded up;

Figure 5e

a perspective view of the support head according to the invention Figure 5d ;

Figure 6a

a cross-sectional view of a bridge with a floor formwork with two ceiling props according to the invention in the loaded state;

Figure 6b

an enlarged view of the in Figure 6a illustrated support head in a front view;

Figure 6c

a cross-sectional view of the bridge according to FIG Figure 6a , wherein the two formwork props connected to the prop head according to the invention are folded up; and

Figure 6d

an enlarged view of the in Figure 6c shown support head in a front view.

1 shows a perspective view of the prop head 1 according to the invention with a Cartesian coordinate system with mutually perpendicular axes X, Y and Z. The prop head 1 has a connection element 2 with a first connection surface (not shown) with a normal vector in the −Z direction. The second connection surface 4 with a normal vector in the Z-direction has two lugs 5a as first guide means for guiding a displacement element 6 that can be moved relative to the connection element 2, with a screw 5b as a further element of the first guide means being inserted and screwed through the two lugs 5a. The screw 5b is inserted through two guide channels 7 of a second guide means in the displacement element 6, the two guide channels resulting from the fact that the displacement element 6 is designed as a pipe section with a cavity extending over the length of the displacement element 6. Connected to the displacement element 6 is a contact element 8 that extends in the Z direction and has recesses 12 that extend in the direction of a longitudinal axis of the displacement element 6 in the X direction from one side of the contact element 8 to another side of the contact element 8 that is opposite this side.

2 shows a perspective view of a ceiling prop 10 with the prop head 1. A formwork prop 11 is connected to the prop head 1 via four screw connections on the first connection surface of the connection element 2, whose normal vector is oriented in the −Z direction. For this purpose, at each corner of the connecting element 2 there is a substantially circular recess through which a screw is inserted, which engages in a flange element of the formwork support 11 corresponding to the connecting element 2 and is secured with a nut. The prop head 1 and the formwork prop 11 together form the slab prop 10.

Figure 3a shows a side view of the support head 1 from 1 with connection element 2 shown semi-transparently. The displacement element 6 is connected via the second guide means in the form of two mutually parallel guide channels 7, which are recessed in the pipe section of the displacement element 6 on two opposite sides, and the screw 5b, which passes through two tabs 5a of the connection element 2 is plugged in, connected to the connecting element 2. By means of the first guide means of the tabs 5a and the screw 5b, the displacement element 6 is therefore connected to the connection element 2 via its guide channels 7 as the second guide means and is movably guided by the connection element 2 . The connection element 2 is designed as a head plate with the first connection surface 3 and the second connection surface 4, which are arranged parallel to one another. The displacement element 6 has the second guide means in the form of two guide channels 7 in such a way that the displacement element 6 can be displaced in the X-direction and -X-direction relative to the connection element 2 .

on the in Figure 3a The left end shown, the second guide means in the form of the two guide channels 7 have a first displacement position V1, in which the screw 5b is oriented as a web between the two brackets 5a with its axis in the Y direction. In the first displacement position V1, the screw 5b thus forms a first axis A1 in the Y direction, about which the displacement element 6 can be tilted by a first angle α in relation to the connecting element 2. The angle α is defined by the height of the first displacement position V1 above the lower side of the displacement element 6 facing the connecting element 2, the length of the displacement element 6 and the distance d1 between the lower side of the displacement element 6 facing the connection element 2 and the second connection surface 4 of the connection element 2 . By tilting the displacement element 6 in a clockwise direction and in the opposite direction, counterclockwise, in relation to the connecting element 2, the first angle α results. The first displacement position V1 is formed by a semicircular groove in the two guide channels 7 of the second guide means in the displacement element 6 in such a way that the first axis A1 is located on a longitudinal axis 18 of the contact element 8, which is arranged on the displacement element 6 and connected to it in a form-fitting manner is. Due to the groove in the second guide means of the displacement element 6, the displacement element 6 can be displaced not only in the X direction and -X direction relative to the connection element 2, but also in the Z direction and in the -Z direction. The second guide means in the form of the two guide channels 7 together have a second displacement position V2 at their ends in the X direction, into which the screw 5b of the first guide means of the connection element 2 can be displaced. Due to the height of the groove 7', which corresponds approximately to half the diameter of the thread of the screw 5b by which the screw 5b can be displaced in the guide channels in the Z direction, the second displacement position V2 is in the -Z direction by the height of the furrow 7' shifted relative to the first shift position V1. This means that when the displacement element 6 is displaced into the second displacement position V2 via the screw 5b, the distance between the displacement element 6 and the connection element 2 is no longer d1 according to the first displacement position V1, but d1 plus the height of the furrow 7 ', which corresponds approximately to half the diameter of the thread of the screw 5b.

The contact element 8 has a width 8b and a length in the direction of its longitudinal axis 18, with the in 1 Recesses 12 shown a semi-transparent shown pin 13 is inserted as a locking pin and secured with a split pin 14 shown semi-transparent against accidental release. The pin 13 has a longitudinal axis which, as the third axis A3, allows the contact element 8 to rotate about a carrier bar when the contact element 8 is pushed into the carrier bar and connected to the carrier bar by means of the pin 13.

In Figure 3b is the support head 1, which in Figure 3a is shown, shown in perspective. The connection plate 2 and the second connection surface 4, on which the two brackets 5a and the screw 5b are fastened as the first guide means, can be seen in a semi-transparent representation. The second guide means are formed in the displacement element 6 as two guide channels 7, with Figure 3b only one of the two guide channels is shown in the -Y direction. With its longitudinal axis, the pin 13 forms the third axis A3, about which the contact element 8 and thus the support head 1 can be rotated about the support bar when the support head 1 is connected to the support bar via the contact element 8 with the recesses 12 and the pin 13. Since the first axis A1 is oriented in the Y direction and the third axis A3 is oriented in the X direction, the first axis A1 and the third axis A3 form a cardan joint via which the formwork support 11 with the carrier bar in the loaded state is in the first displacement position V1 connected is. The pin 13 can be conically shaped and secured by the cotter pin 14 against unintentional detachment from the contact element 8 . Instead of a piece of pipe for the displacement element 6 and the bearing element 8, the displacement element 6 and/or the bearing element 8 can consist of solid material. In this case, the displacement element 6 has only one guide channel 7 as a second guide means, which extends in the Y-direction from one side of the displacement element to a second side opposite this side. It is also possible that one or more guide channels are not formed in the displacement element 6 but in each of the two tabs 5a of the connection element 2 . In this case, depending on the design, a second guide means is present in the displacement element 6 in the form of one or more webs which engage in each of the tabs 5a and thus in the guide channel formed by each of the tabs. It is also possible that on one side, for example the side of the displacement element 6 oriented in the −Y direction, a guide channel is arranged in the displacement element 6 and the tab 5a opposite this side has the screw 5b in order to engage in the guide channel, wherein on On the other side opposite this side in the Y direction, the displacement element 6 has a web with a longitudinal axis in the Y direction, which extends into a second guide channel engages, which is formed in the second tab 5a, which faces the other side of the sliding element 6.

The in the Figures 1 to 3 The prop head 1 shown can be designed with regard to its connection element 2 with a hole pattern that is designed to be compatible with props from PERl. The connection can be made with fitting bolts with a diameter of 21 mm with respect to the pin 13 in a girder in the form of a steel waler SRU, which can be designed as a cross bar of a VARIO slab formwork in a bridge trough. In this embodiment, the support head 1 can have a weight of 2.6 kg and can be produced at a cost of less than €20. The load-bearing capacity (pre-static) can be around 55 kN. The first axis A1 and the third axis A3 can provide gimbal pitch and roll compensation of about +/- 4 degrees in this embodiment.

The prop head 1 can be used in particular in the incremental launching method, for example in bridge construction, to fold up the internal slab props 10 while the VARIO slab formwork is being warped into a new concreting section. The displacement of the VARIO slab formwork in the new concreting section forms a drawer solution for concreting, for example, a roadway slab of a bridge that is to be built. The first axis A1 allows an inclination compensation along a bridge trough and is advantageously a screw connection according to Figures 1 to 3 executed. The third axis A3 is designed as a fitted bolt connection with the pin 13 and enables the inclination to be compensated transversely to the bridge trough. The displacement element 6 and the contact element 8 can be designed together as a pipe T-piece and a guideway can be made in the displacement element 6, which allows pivoting up transversely to the support beam in the form of the steel beam SRU with a very small installation height, because the connection element 2 in shape of the top plate can be pushed out of a collision area with the displacement element 6 and/or the carrier bar by displacement from the first displacement position V1 to the second displacement position V2 (pivoting function of the support head 1 with regard to the formwork support 11 in the second displacement position V2 in the unloaded state). Finally, the connecting element 2 in the form of the head plate can have a square or rectangular shape with round recesses at the corners, which enable the prop head to be fixed to the formwork prop 11 .

In Figure 4a 1 is a front view of the prop head 1 in the loaded state with the formwork prop 11 connected and the support bar 9 connected, with the support bar 9 being shown in a semi-transparent side view. The support bar 9 has an elongated shape with a longitudinal axis L in the Y-direction and recesses 20 in a circular shape into which the pin 13 can be inserted. In the loaded state of the support head 1, the contact element 8 is arranged within the support bar 9 in such a way that the pin 13 connects the support bar 9 to the support head 1 via the recesses 20 in the support bar 9 and the recesses 12 in the contact element 8 in such a way that the pin 13 forms the third axis A3. In the −Z direction, the lower side of the carrier bar 9 is at a distance from the upper side of the displacement element 6 in the Z direction in such a way that a transverse inclination compensation with a third angle γ is possible. For example, a cross slope compensation by the angle γ of approx. +/-4 degrees can be possible such that the carrier bar 9 can be rotated in the Y/Z plane about the ceiling support 10, more precisely the formwork support 11, by the angle γ.

In Figure 4b 1 is a side view of the prop head 1 in the loaded state with the formwork prop 11 connected and the support bar 9 connected, with the support bar 9 being visible in a semi-transparent cross-section. The prop head 1 with the connection element 2 connected to the formwork prop 11 and the displacement element 6 in the first displacement position V1 is connected via the contact element 8 to the carrier bar 9 in such a way that the prop head 1 is in a state loaded by the carrier bar 9, in which the Prop head 1 is supported by the formwork prop 11 in the essentially Z-direction.

The width 8b of the contact element 8 corresponds to the width 9d" of a spacer rail 9d, which has two U-profiles 9p', 9p" facing away from each other on the in Figure 4b shown upper side of both U-profiles 9p', 9p" with each other. Since the height 8h of the contact element 8 essentially corresponds to a height 9h of the carrier bar 9 shaped as a double U-profile minus the thickness 9d' of the spacer rail 9d, the contact element 8 arranged almost completely within the carrier bar 9 in the loaded state and/or in the unloaded state when the carrier bar 9 is in contact with the ceiling support 10. The carrier bar does not have to have a double U-profile. In other exemplary embodiments, the carrier bar 9 can consist of at least two mutually im Substantially parallel and spaced profiles of substantially the same height, each profile being in the shape of a rectangle, square, L or other shape with or without rounded corners or edges Embodiments essentially correspond to the height of the profiles of the carrier bar 9. Because of the transverse inclination Likewise across the third axis A3, there is a distance between the lower side of the carrier bar 9 in the -Z direction and the upper side of the displacement element 6 in the Z direction such that the abutment element 8 is not fully inserted into the carrier bar 9. However, the distance between the carrier bar 9 and the displacement element 6 can be selected to be small if the angle of inclination γ is small, or it can be avoided completely in such a way that compensation for the transverse inclination via the third axis A3 is not possible. Depending on the play of the pin 3 within the recesses 20, however, even if the contact element 8 is completely arranged within the carrier bar 9, a transverse inclination compensation can still take place.

In any case, a longitudinal inclination compensation via the first axis A1 in the first displacement position V1 between the formwork support 11 and the carrier bar 9 by the first angle α is possible. As in Figure 4b shown, the distance between the lower side of the displacement element 6 and the second connection surface 4 of the connection element 2 is small, so that the first angle for longitudinal compensation is also small.

In the Figure 4b The left-hand side 6s shown of the displacement element 6 is aligned with a lower left-hand side 9s of the carrier bar 9 which rests against the displacement element 6 in the loaded state in the Z-direction.

In Figure 5a is one opposite the Figure 4b 180 degree rotated side view of the prop head 1 shown in the loaded state with connected formwork prop 11 and connected beam 9, wherein the beam 9 is connected to a ceiling formwork 100. Due to the displacement of the first displacement position V1 relative to a longitudinal axis of the second guide means in the form of the two parallel guide channels 7 in the displacement element 6 in the Z-direction, the prop head is loaded by the slab formwork 100 with the girder 9 in such a way that this load is transmitted by the prop head 1 and the formwork support 11 is derived in a substantially negative Z-direction. The first displacement position V1 is centered below the contact element 8 on a transverse axis 19 of the carrier bar 9, which runs perpendicular to the longitudinal axis L of the carrier bar 9 in the Y direction. Since the contact element 8 has a shape corresponding to the interior of the double U-shaped carrier bar 9, the first displacement position V1 is not only on the transverse axis 19 of the carrier bar 9, but also on the longitudinal axis 18 of the contact element 8. In the first Shifting position V1, the first axis A1 thus forms the possibility of longitudinal inclination compensation in such a way that the load caused by the ceiling formwork 100 with the carrier bar 9 is introduced into the ceiling support 10 without eccentric load introduction. The distance d1 between the lower side of the displacement element 6 and the second connection surface 4 of the connection element 2 allows the longitudinal inclination compensation and the third axis A3, which corresponds to the longitudinal axis 13 of the pin 3, allows the transverse inclination compensation due to the distance between the lower side of the carrier bar 9 and the top of the sliding element 6, which in Figure 5a In contrast to the Figures 4a and 4b can be clearly seen. A flange of the formwork prop 11 that corresponds to the connection element 2 rests on the prop head 1 on the first connection surface 3 .

Figure 5b shows a side view of the support head 1 according to FIG Figure 5a in the unloaded state in the first displacement position V1. The distance d2 between the lower side of the displacement element 6 and the second connection surface 4 in the unloaded state is greater than the distance d1 in the loaded state, as a comparison between d1 and d2 shows. The distance d2 is the distance d1 and the height of the groove 7' in the second guide means in the form of the two recessed guide channels 7, the height of the groove 7' corresponding approximately to half the diameter of the thread of the screw 5b. Due to the connection of the carrier bar 9 to the contact element 8 by means of the pin 13, the support head 1 is connected to the carrier bar 9 in the unloaded state. The difference between the quantities d2 and d1 is illustrated by a comparison between the Figures 5a and 5b . The sliding element 6 in Figure 5a covers 2/3 of the screw heads in the Z-direction of the screws with which the connecting element 2 is connected to the formwork prop 11. In Figure 5b on the other hand, the underside of the sliding element is above the tops of the screw heads of the screws with which the connection element 2 is connected to the formwork support 11 . The shifting of the formwork support 11 in relation to the shifting element 2 is Figure 5b symbolized by an arrow shown in the -Z-direction within the formwork support 11. Within the second guide means in the form of the two guide channels 7, the screw 5b can be moved in the X-direction within the guide channels.

Figure 5c 13 is a side view of the prop head 1. FIG Figure 5a in the relieved state now in the second displacement position V2. The groove 7' in the Z-direction opposite the second guide means with the guide channels 7 illustrates the first displacement position V1 when the web of the connection element 2 in the form of the screw 5b is arranged within the groove 7' about the first axis A1 below the transverse axis 19 of the carrier bar 9 to form. In the relieved state, in which the load of the slab formwork 100 with the carrier bar 9 is not dissipated via the formwork support 11, the formwork support 11 is opposite the displacement position V1 in the X direction at the opposite ends of the displacement position V1 in the X direction of the two guide channels 7 of the second guide means moved / pushed out.

The direction of displacement from the first displacement position V1 to the second displacement position V2 runs in the X direction, as indicated by the arrow in the X direction.

Figure 5d shows the side view of the support head 1 Figure 5a in the unloaded state in the second displacement position V2 with the formwork support 11 folded up. The longitudinal axis of the formwork support 11 is oriented in the X direction instead of the orientation in Figure 5c in Z direction. Therefore the formwork prop is 11 in Figure 5d opposite the formwork prop 11 in Figure 5c rotated through a second angle β of approximately 90°. In the X/Z plane, each of the two guide channels 7 forms a recess 7" which has a longitudinal axis in the X direction. On the longitudinal axis of the surface 7" in the X/Z direction of each of the two guide channels 7 is the Shift position V2 such that an axis is formed by the two guide channels about which the formwork support 11 can be rotated. The second angle β is larger than the first angle α because the in Figure 5d shown right-hand side 6s of the displacement element 6 is aligned with the right-hand outer side 9s of the leg 9p' of the double U-profile of the carrier bar 9, which rests against the displacement element on its upper side. As a result, the second connection surface 4 of the connection element 2 can be moved past the sides 6s of the displacement element 6 and 9s of the carrier bar 9 in the Z direction in order to enable a second angle β of approximately 90°.

Figure 5e shows a perspective view of the support head 1 according to FIG Figure 5d . One can see the connection element 6 with second guide means in the form of one of the two recessed guide channels 7 and the tabs 5a and the screw 5b as the first guide means of the connection element 2, which are arranged on the second connection surface 4. The carrier bar 9 has a hollow interior such that the contact element 8 is arranged almost entirely in the interior of the carrier bar 9, which results in a low construction height of the prop head 1 such that only a slight reduction in the load on the ceiling prop 10 due to the additional static height of the Prop head 1, which consists essentially of the height of the displacement element 6 in the Z direction, occurs. The prop head 1 thus enables only a small increase in the buckling length of the ceiling prop 10 due to the arrangement of the contact element 8 essentially within the carrier bar 9 due to the compact design of the Prop head 1. In the folded-up position of the formwork prop 11 in the unloaded state of the floor prop 10 compared to the position of the formwork prop 11 in the loaded state of the floor prop 10, the formwork prop 11 can be fixed to the displacement element 6 and/or the carrier bar 9 by a fixing means, for example a wire being. Alternatively, there can be a snap connection, which is arranged on the displacement element 6 or the formwork support 11, which can be achieved in a corresponding snap element, which is arranged on the displacement element 6 and/or the formwork support 11, in the formwork support 11 being fixed in the folded-up state.

Figure 6a shows a cross-sectional view of a bridge with a roadway slab 160 and the ceiling formwork 100 with ceiling supports 10 in the loaded state. Both floor supports 10 run in the Z-direction from the bridge trough 130 to the girder bar 9 in the form of an SRU cross bar. The prop head 1 forms a connecting link between the slab formwork 100 with the girder 9 and the formwork prop 11. The girder 9 is mounted on a traveling beam in the form of an SRU traveling beam as a longitudinal beam in the X direction, which in Figure 6a is shown as two rails on the outside of the carrier bar 9. The traveling beam 110 is mounted on a roller bearing 120 in such a way that the floor formwork 100 can be moved in the X direction or -X direction. After concreting a portion of the deck 160, the slab formwork 100 is lowered as indicated by the arrow in the -Z direction in FIG Figure 6a is shown. The ceiling formwork 100 is lowered onto the roller bearing 120 with the aid of the ceiling supports 10, each with the support head 1, in order to be able to move in the X-direction, into the plane of the drawing.

Figure 6b shows an enlarged view of the in Figure 6a illustrated support head 1 in a front view with an enlargement of 5: 1 compared to the Figure 6a . The cross slope compensation via the third axis A3 by the third angle γ allows the underside of the roadway slab 160 to be inclined in order to produce a desired inclination of the upper side of the roadway slab 160 for future traffic on the bridge. A corresponding incline may be necessary, for example, in the case of a curve on a freeway that is implemented by a bridge. The ceiling formwork 100 comprises the support bar 9, which is inclined by the angle γ relative to the Y direction, in which the longitudinal axis of the screw 5b is oriented. Since the displacement element 6 cannot be rotated in relation to the formwork support 11 in the X direction, the angle γ is present between the ceiling formwork 100 with the carrier bar 9 and the ceiling support 10 . In addition, a longitudinal inclination compensation with a rotation around the Y-axis is possible via the screw 5b, but in Figures 6a and 6b not shown, although such a pitch could exist on a sloping roadway in or against the direction of travel.

Figure 6c shows a cross-sectional view of the bridge according to FIG Figure 6a , whereby the two formwork supports 11 connected to the support head 1 are folded up. During the warping of the ceiling formwork 100 into a next concreting section, bulkheads or storage boxes 150 define a traveling girder level 170 over which the girder bar 9 must be warped in order to reach the next concreting section. The formwork supports 11 are in the X direction, ie in the plane of the page Figure 6c folded up by the second angle β in such a way that the carrier bar 9 can be displaced/displaced above the traveling carrier level 170 .

In Figure 6d is an enlarged view of the in Figure 6c illustrated support head 1 shown in a front view, which is opposite Figure 6c enlarged by a scale of 5:1. The ceiling formwork 100 with the carrier bar 9 is connected to the prop head 1 in such a way that the displacement element 8 is arranged inside the carrier bar 9 and when folded up, only the width of the connection element 2 protrudes from the carrier bar 9 in the −Z direction. In the folded-up state, the second connecting surface 4 forms the surface that protrudes from the carrier bar 9 in the Y/Z plane. In addition, parts of the ceiling support 10 can be seen which only protrude to a small extent beyond the shape of the connection element 2 in the −Z direction. The bulkheads or storage boxes 150 allow only a small distance to the underside of the carrier bar 9, the ceiling supports 10 not having to be laboriously dismantled and reassembled after the ceiling formwork 100 has been warped, which would lead to an increase in cycle speed, which is undesirable. Instead, the ceiling props 10 always remain in their statically provided position relative to the carrier bar 9, which minimizes a risk of misuse during warping of the ceiling formwork. Due to the low construction height, which is essentially defined by the dimensions of the connecting element 2 and its extension in the -Z direction, high obstacles in the bridge trough, for example internal bulkheads, storage boxes 150, for example for tendons etc., can also be handled without collision when the floor prop 10 is folded up be run over. This is possible because the folded-up ceiling supports 10 do not protrude beyond the traveling beam level 170 in an essentially negative Z-direction.

The features of the invention described with reference to the illustrated embodiment, such as the recessed guide channels 7 arranged parallel to one another on two opposite sides of the displacement element according to FIG 1 , can also be present in other embodiments of the invention, for example combined with only one guide channel cut out in the same displacement element in the event that the two guide channels are located in a tubular section of the displacement element and only one guide channel cut out in a section made of solid material adjoining the tubular section is, unless otherwise stated or prohibited for technical reasons.

Claims (17)

1. Support head (1)for a ceiling support (10) for a ceiling formwork (100), wherein the support head (1) comprises

   - a connecting element (2) with first and second connecting surfaces (3, 4) facing away from one another, wherein the first connecting face (3) is connectable or connected to a formwork support (11) and the second connecting face (4) has first guide means (5a, 5b) for guiding a displacement element (6) which is displaceable with respect to the connecting element (2), and

   - the displacement element (6) which is arrangeable between a girder bar (9), e. g. in the form of a double U-profile, the ceiling formwork (100) and the connecting element (2) and has second guide means (7, 7', 7") which cooperate with the first guide means (5a, 5b) of the connecting element (2), characterized in that the second guide means (7, 7', 7") cooperate with the first guide means (5a, 5b) such that

   - in a loaded state of the support head in a first displacement position (V1) the first and second guide means (5a, 5b, 7, 7', 7") form an axis (A1) underneath the girder bar (9), about which the displacement element (6) is tiltable relative to the connecting element (2) by a first angle (α), and

   - in an unloaded state of the support head (1), when the element (6) abuts against the girder bar (9), the connecting element (2) is displaceable from the first displacement position (V) into a second displacement position (V2) substantially perpendicular to the longitudinal direction (L) of the girder bar (9) and transversely to the girder bar (9) in a plane defined by the first connecting surface (3) with a normal vector in a direction of load introduction in the loaded state, wherein the connecting element (2) is rotatable in the second displacement position (V2) relative to the displacement element (6) by a second angle (β) which is greater than the first angle (α), in particular by the second angle (β) of at least 90 degrees.
2. Support head (1) according to claim 1, where

   - the axis (A 1) formed in the loaded state of the support head (1) in the first displacement position (V1) underneath the girder bar runs as a first axis substantially in a longitudinal direction (L) of the girder bar (9), and

   - the support head (1) further comprises an abutment element (8) for abutment against the girder bar (9) of the ceiling formwork (100), which is connected integrally with or detachably to the displacement element (6) and which, in the abutted state, is rotatably connected to the girder bar (9) about a third axis (A3) substantially perpendicular to the longitudinal direction (L) of the girder bar (9).
3. Support head (1) according to claim 2, where the first axis (A1) formed in the loaded state of the support head (1) in the first displacement position (V1) is arranged centered underneath the abutment element (8) to prevent the introduction of an eccentric load into the ceiling support (10).
4. Support head (1) according to claim 2 or claim 3, where the first axis (A1) running substantially in the longitudinal direction (L) of the girder bar (9) and the third axis (A3) running substantially perpendicular to the longitudinal direction (L) of the girder bar (9) form a cardan joint, wherein the first axis (A1) has a longitudinal inclination compensation with the first angle (α) of approx. +/- 4 degrees and the third axis (A3) allows a transverse inclination compensation with a third angle (y) of approx. +/- 4 degrees.
5. Support head (1) according to any one of claims 2 to 4, where, in the applied state, the third axis (A3) running substantially perpendicular to the longitudinal direction (L) of the girder bar (9) is formed by a pin (13) which is put through two recesses (12) of the abutment element (8) which are arranged opposite to each other substantially perpendicular to the longitudinal direction (L) of the girder bar (9).
6. Support head (1) according to any one of claims 2 to 5, where the girder bar (9) is formed by at least two substantially parallel and spaced-apart profiles of substantially the same height, in particular a double U-profile with double U-profiles (9p', 9p") facing away from each other with a spacer rail (9d) on one side of the double U-profile between the U-profiles (9p', 9p"), for example made of steel as a steel bar, and, in the abutted state of the abutment element (8), a height (8h) of the abutment element (8) corresponds to the height of the profiles, in particular a height (9h) of the U-profiles (9p', 9p") minus the thickness (9d') of the spacer rail (9d) and/or a width (8b) of the abutment element (8) corresponds to a width (9d") of the spacer rail (9d).
7. Support head (1) according to any one of claims 2 to 6, wherein the displacement element (6) and the abutment element (8) connected to the displacement element (6) form a T-piece and/or pipe piece.
8. Support head (1) according to one of the preceding claims, where, in the loaded state of the support head (1), a side (6s) of the displacement element (6) at which the second displacement position (V2) is located, aligns with an outer edge of the girder bar (9), in particular an outer edge of a leg (9s) of the double U-profile of the girder bar (9), when the first axis (A1) formed in the first displacement position (V1) is arranged centered underneath the girder bar (9).
9. Support head (1) according to any one of the preceding claims, where the connecting element (2) is in the form of a head plate with parallel first and second surfaces (3, 4) to one another and with at least two lugs (5a) opposing one another in the longitudinal direction of the girder bar as components of the first guide means (5a, 5b) on the second connecting surface (4).
10. Support head (1) according to claim 9, wherein

    - the displacement element (6) has, as second guide means (7, 7', 7"), a guide channel (7) extending from one side to the other side of the displacement element (6), at the ends of which channel the first and second displacement positions (V1, V2) are located, wherein the first guide means comprise a web, for example in the form of a screw (5b) or rivet, extending from one lug (5a) through the guide channel (7) to the other lug (5a), or

    - the displacement element (6) has, as second guide means (7, 7', 7"), on two opposite sides of the displacement element (6) recessed guide channels parallel to each other, at the ends of which the first and second displacement positions (V1, V2) are located, respectively, wherein the first guide means (5a, 5b) on each lug (5a) comprise a web, for example in the form of a screw (5b) or rivet, which engage in the guide channel facing the respective lug (5a).
11. Support head (1) according to claim 9, where

    - the connecting element (2) has as first guide means (5a, 5b) respective lugs (5a) each of which having a guide channel extending from one side of each lug (5a) to the other side of each lug (5a), at the ends of which guide channel the first and second displacement positions (V1, V2) are located, respectively, wherein the second guide means (7, 7', 7") of the displacement element comprise a web, for example in the form of a screw or rivet, which at opposite ends of which engage in the guide channels formed by the lugs, or engage in the guide channels formed by the lugs, or

    - the connecting element (2) has as first guide means respective lugs (5a) each of which having a guide channel extending from one side of each lug (5a) to the other side of each lug (5a), at the ends of which guide channel the first and second displacement positions are located, respectively, wherein the second guide means (7, 7', 7") of the displacement element (6) comprise on each side facing the lugs (5a) a web, for example in the form of a screw or rivet, which engages in the respective guide channel of each lug (5a).
12. Support head (1) according to claim 10 or claim 11, where the first or second guide means (5a, 5b, 7, 7', 7") have a recess (7') extending substantially in the longitudinal direction (L) of the girder bar (9) in the side of the guide channel (7) facing the girder bar (9) or furrows extending substantially in the longitudinal direction (L) of the girder bar (9) in the sides of the guide channels facing the girder bar (9) to form the axis (A1) formed in the loaded state of the support head (1) in the first displacement position (V1) underneath the girder bar (9).
13. Support head (1) according to any one of the preceding claims, where the connecting element (2), when rotated in the second displacement position (V2) relative to the displacement element (6) by the second angle (β), is lockable on the displacement element (6) or the girder bar (9).
14. Ceiling support (10) with a support head (1) according to one of the preceding claims and the formwork support (11) arranged on the support head (1).
15. Ceiling formwork (100) with a ceiling support (10) according to claim 14 and the girder bar (9) arranged on the formwork support (10).
16. Ceiling formwork (100) according to claim 15 in connection with claim 6, where the girder bar (9) is in the form of a double U-profile with double U-profiles (9p', 9p") facing away from each other with a spacer rail (9d) on one side of the double U-profile between the U-profiles (9p', 9p"), made in particular of steel as a steel bar.
17. Method of erecting a ceiling formwork (100) according to any one of claims 15 or 16 with a formwork surface which is composed of several formwork elements, wherein at least two ceiling supports (10) according to claim 14 are used for erecting the ceiling formwork (100), wherein the support heads (1) of the ceiling supports (10) are each loaded by being abutted against the girder bar (9) and in the first displacement position (V1) the first and second guide means (5a, 5b, 7, 7', 7") of the connecting element (2) and the displacement element (6) of each support head (1) form the axis (A1) underneath the girder bar (9), the support heads (1) are relieved by moving downward the connecting element (2) of each support head (1), the respective connecting element (2) is moved from the first displacement position (V1) into the second displacement position (V2), is rotated into a substantially horizontal position, and is locked at the respective displacement element (6) or the girder bar (9).

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