DE9005901U1 - Ceiling formwork system, especially for producing concrete ceilings - Google Patents

Description

NOE formwork technology Georg Meyer-Keller GmbH + Co. Kuntzestraße 72 7334 Süssen

3003 235 ^3.05 H-S/jnr (9C/1£)

Title ; Ceiling formwork system, in particular for the manufacture of concrete ceilings

"The invention relates to a ceiling formwork system, in particular for the manufacture of concrete ceilings, with crossbars supporting formwork panels, which can be hooked in and out with their longitudinal ends between longitudinal beams that run parallel and at a distance from one another and are each held at the end between adjustable supports in a drop head, whereby the crossbars each have an engagement extension on the front side that runs across the width of the crossbar and protrudes perpendicularly from the crossbar, which fits into a support channel formed by an edge profile and a flange web of the longitudinal beam.

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can be recorded.

Such a ceiling formwork system is used, depending on the type of lintel used, for stripping ceilings with a clear height of up to 5 m, but can currently only be formed and stripped up to heights of approx . 100 m from a standing position, i.e. from the ground without stepladders, mobile scaffolding and the like. These ceiling heights are usually only found in underground car parks, which has the disadvantage that the formwork - in particular the crossbars and the formwork panels - for rooms with higher ceilings can only be assembled and dismantled with the aid of the ladders mentioned, since the crossbars with their hook-like downward-curved and crossbar-wide engagement extensions can only be inserted from above, i.e. from the top of the ceiling formwork, in the support grooves of the longitudinal beams that have already been assembled in rows at a fixed distance from one another.

Accordingly, the object of the present invention is to improve a ceiling formwork system of the type mentioned at the outset so that the ceiling formwork system can be fitted and removed from the ground, preferably at heights of up to 3.50 m, without stepladders, scaffolding and the like; this should also be able to be carried out by just one fitter without compromising his safety.

To solve this problem, it is planned that the

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The engagement extension has a spherical or convex elevation in the direction of the width of the crossbar on a rear surface facing the edge profile and on a front surface facing the belt web, in particular a rounded rotating nose on the rear surface and a rounded spacer nose arranged opposite the rotating nose on the front surface.

This makes it possible to hook the crossbar into one of the longitudinal beams of the previously constructed rows of longitudinal beams with a distance of the length of the crossbar from one another from the ground, whereby the rotating nose engages in the support channel and prevents slipping. The crossbar can then be easily swung up using an assembly fork and at the same time, through the interaction of the rotating nose with the inner surface of the edge profile facing the support channel, swung in the longitudinal direction of the longitudinal beam, i.e. around a rotation axis running perpendicular to the ground, whereby the free end of the crossbar can be swung up past the longitudinal beam, in which it can be accommodated with its engaging extension, after which the crossbar is held vertically between the parallel longitudinal beams in the longitudinal direction of the crossbar and cannot be moved.

Tilting of the crossbar around its longitudinal axis is prevented in the structural design by the fact that the engagement extension can be designed in the shape of a cuboid disk

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and a protruding from the bottom of the crossbar

circumferential support surface which is connected to the floor surface I

the receiving channel. The support surface can be P

at least one of the support depth

corresponding amount from the crossbar bottom

so that the top of the crossbar has a defined distance

to the bottom surface of the support channel, whereby the | crossbars onIsgbsr^n, preferably made of simple plywood J

existing formwork panels a flat closed &iacgr;

&Idigr; Form the formwork surface with the upper chords of the longitudinal beams. |

To prevent the crossbar from pivoting in the upward direction

both longitudinal beam directions, is in

A particularly useful embodiment provides that the

Noses in the middle of the front or back surface

can be arranged so that the side of the front surface of

this side surfaces sloping towards the back surface

are provided and that the rear surface has two swivel surfaces -

which is mounted on both sides of a pivoting nose

arranged in the middle area and running at an angle &xgr; towards the front. This also prevents the rear surface from _tilting on the inside of the support, which would prevent it from swiveling.

Area of the edge profile prevented. f

In a further preferred embodiment, it is provided that the | distance nose which can be brought into contact with the belt web is perpendicular to the | crossbar central axis and to the crossbar width direction f

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can have a semi-cylindrical cross-section and preferably extends in two parts over the entire height of the engagement extension gyf. This can advantageously prevent, among other things, the pivoting of the engagement extension around the inner longitudinal axis of the support after the crossbar has been securely received between the longitudinal supports that receive it

In an advantageous further embodiment, slipping of the crossbar that is suspended on one side can be effectively prevented by the fact that the rotating nose can have a hump-like shape that runs conically or triangularly from a contact surface that is preferably slightly inclined relative to the perpendicular to the rear surface, close to the support surface. The contact surface can have a hook- like acute angle or a jump-like obtuse angle to the rear surface, although the latter should not exceed 95°. In order to ensure that the rotating nose engages in the support channel at all times when the crossbar is suspended on one side, the distance between the contact surface and the underside of the crossbar is selected so that it corresponds at least to the width of the edge profile.

This means that in a preferred embodiment the support channel can have a trapezoidal cross-section that is slightly convergent to the base surface and that the spacer nose is slightly conical in the direction of the support surface

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tapers, in particular with an angle to the front surface that is equal to the inclination of the side surfaces of the flange web or edge profile forming the support channel, an interaction of the support surface of the engagement extension with the bottom surface of the support channel, as well as the spacer nose with the associated side surface, whereby an independent "sliding" of the engagement extension into the support channel is ensured and a» secured, stable engagement position of the engagement extension in the support channel is provided when the formwork surface is subjected to pressure during the pouring process.

In a further development of the engagement extension, it is provided that the spacer nose can extend close to the support surface and run out in a rounded manner towards the front surface, whereby the transition between the support surface and the front surface can also be rounded or broken ^. This makes pivoting when inserting the crosspiece much easier without affecting the ^correct positioning of the engagement extension in the support groove.

In a further advantageous development, it is provided that the engagement extension can be formed on a front plate, which can be connected to a crossbar beam via a connection area arranged on the rear surface of the engagement extension. This allows different crossbar beam types with different

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Load-bearing function adapted properties especially with |

optimized bending inertia surfaces are used. In an advantageous variant, it is provided that the 1

Front plate on a the longitudinal end areas of the |

Crossbar beam is designed/fastened with a form-fitting insert shoe â , which can be additionally secured with fastening means if necessary. A crossbar beam designed in this way can be inexpensive and easy to handle for a fitter and can advantageously be a squared timber beam with a rectangular cross-section and preferably a tapered attachment area at the end in beam width and/or beam height, whereby the insert shoe can have a shear trough formed by a U-steel or aluminum profile, the side legs of which are connected at the ends by means of a cover plate and to whose long edges the front plate is attached, preferably welded. The tapered area is preferably received and attached in the insert shoe so that it abuts the front plate and the surface of the beam adjoining it forms a flat contact surface for the formwork panels.

Further details and embodiments of the invention can be found in the claims and the following description, in which the invention is described and explained in more detail using an exemplary embodiment shown in the drawings. They show:

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Figure 1 is a schematic view of a column-shaped structure,

Ceiling formwork system constructed from longitudinal beams, cross beams and formwork panels, partially cut;

Figure 2 is a view of the longitudinal end UBf? ?&iacgr;&idigr;

sinea longitudinal beam suspended crossbeam according to a view along arrow II of the ceiling formwork shown in Figure 1 on an enlarged scale?

Figure 3 a side view of the front plate with

engagement extension of the longitudinal crossbar end shown in Figure 2;

Figure 4 is a plan view according to arrow IV of the

shown front plate;

Figure 5 is a schematic representation of the

The assembly process of the ceiling formwork system takes place in two assembly steps, in which the longitudinal beams are already erected and the crossbars are hung in longitudinal beams running parallel to each other.

Figure 1 shows a section of a ceiling formwork system, in which, for clarity, equal

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The same reference symbols are used for the slab formwork components.

The ceiling formwork system consists of a number of longitudinal beams 10 running parallel to one another, which are held by their longitudinal ends in the drop piece 4 of a drop head 3, which in turn are mounted on the upper end of vertically erected supports 1. The supports can be lifted up to a tripod for vertical alignment and stability . The drop head 3 is known, for example , from DE-PS 33 16 557. The ceiling formwork height is, for example, 3 m in the upper shuttering position of the drop piece 4; for demolding, the longitudinal beams 10 in the drop head 3 can be lowered by up to mm.

The longitudinal beams 10 have, as can be seen in particular from Figure 2, a substantially I-shaped, simply symmetrical cross-section; they consist of an upper chord 11, an adjoining chord web 15, and a lower chord 12, on the longitudinal edges of which an edge profile 13 is formed. The edge profiles 13 and the web 15 each form a support channel 14 running on both sides of the longitudinal beam 10 over its entire longitudinal extent with channel inner surfaces 13', 15' running slightly convergently to the support inner base surface 16, i.e. with a trapezoidal convergent cross-section.

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As is further shown in Figure 1, between each two parallel rows of longitudinal beams there are provided a number of crossbars 20 arranged transversely thereto, the length of which is determined depending on the clear width between the rows of longitudinal beams and which, with a cantilever-like gripping extension 31 on the longitudinal end, fit into the respective support channel 14 of the longitudinal beams 10 arranged along the length and are suspended immovably in the longitudinal direction of the crossbar. Formwork panels 7, which in the simplest case consist of plywood, serve as the ceiling formwork covering. The size, number and arrangement of the formwork panels " is selected such that they can be placed abutting one another between the longitudinal beams 10 on the cross bars 20, with their long-side panel joints 8 abutting one another via one of the cross bars 20, the wide-side panel joints 9 of the formwork panels 7 closest to a longitudinal beam 10 interacting with a stop edge 17 of the upper chord II (Figure 2) and the formwork panels 7 forming a closed, flat ceiling formwork with the surfaces of the upper chords II of the longitudinal beams 10 and the open head plates 5 of the drop heads 3.

Figure 2 shows a cross section through a longitudinal beam 10 with the longitudinal end of a crossbar 20 suspended therein in a preferred embodiment. The crossbar 20 consists of a crossbar beam 21 in the form of a square wooden beam, which has a

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Beam width and/or beam height has a tapered attachment area onto which an insertion shoe 23 is pushed in a form-fitting manner. The insertion shoe 23 consists of a shoe tray 24 formed by a U-steel or aluminum profile, between the legs of which the tapered attachment area 2? projects and is secured against displacement by means of two washer-backed screws 27 with nuts 26 running in the direction of the crossbar width, furthermore of a cover plate 25 which connects the side legs at the ends and is welded to them, which forms a flat support surface for the formwork panels 7 with the adjoining support surface 28 of the crossbar 21, and furthermore of a front plate 30 which closes the front of the insertion shoe 23 and is welded to the side leg longitudinal edges of the shoe tray 24 via a connection area 32 with the same crossbar cross section. On the front plate 30, the engagement extension 31 is designed in the form of a polyhedral disk-shaped body, which protrudes with a lower peripheral support surface 33 from the underside 29 of the locking beam 21 or the lower edge 29' of the connection area 32 by at least an amount corresponding to the inner support depth, so that the support surface 33 can interact with the bottom surface 16 of the support channel 14 for the hookable reception of the engagement extension 31 in the longitudinal member 10.

The engagement extension 31 has a rear surface 34 facing the edge profile 13 a raised area in the form of a rounded

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Pivot nose 39 and on a front surface 35 facing the belt web 15, a convex elevation in the crossbar width direction, in particular a rounded, two-part spacer nose 44,44'.

Figures 3 and 4 show the design of the engagement extension 31 on the front plate 30 in more detail. The lugs 39, 44, 44' are arranged in the middle between the side surfaces 36 of the engagement extension 31, which run convegently in the closure area 32 at an angle to the front surface 35, i.e. in the transverse center of the crossbar 20. On both sides of the central surface area 38 of the rear surface 34, which has the rotating nose 39, a pivoting surface 37, 37' is formed, which runs at an angle of 37" towards the front side 35, so that, as shown in Fig. 4, the lower area of the engagement extension 31, which is received in the support groove 14, has a hexagonal, elongated cross-section, with two opposite parallel sides (front and rear surfaces 35, 38) and sides tapering to one another with unrounded corners (side and pivoting surface 36, 37).

The rotary nose 39 arranged on the rear surface 34 has a hump-like shape, has a contact surface 40 that is slightly inclined relative to the perpendicular to the rear surface 34 and runs conically or triangularly with an inlet angle 42 in the edge area of the support surface 33. The contact surface 40 has a

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Distance 43 to the lower edge 29' of the connection area 32, which runs coplanar with the underside of the crossbar and which corresponds at least to the width of the edge profile 13 of the longitudinal member 10. The bevel angle 41 between the contact surface 40 and the perpendicular to the rear side 34 or middle surface area 38 is selected so that the turning nose 39 is either slightly ramp-like or slightly hook-like, whereby the bevel angle 41 is preferably o' +/- 5*.

The spacer nose 44,44' arranged on the front surface 35 has a semi-cylindrical cross-section, runs perpendicular to the crossbar center axis and to the crossbar width direction and extends in two parts to the vicinity of the support surface 33. The spacer nose 44,44' runs slightly conically in the direction of the support surface 33 with an inlet angle 45, with the lower area of the spacer nose 44 running rounded into the front surface 35. The transition between the support surface 33 and the front surface 35 is also rounded or broken.

As can be seen in particular from Figure 2, the inlet angle 45 of the spacer nose 44,44' is selected so that it is equal to the inclination 15" of the inner surface 15' of the channel formed by the belt web 15, so that a system extending over the entire extent of the spacer nose 44,44' is ensured. The engagement extension 31 is hereby provided with

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Noses 39, 44, 44' are received between the inner surfaces 13', 15' of the support channel 14 when the support surface 33 interacts with the base surface 16, so that play transverse to the longitudinal extension of the channel is prevented as far as possible. The inclined design of the inner surfaces 13', 15' of the channel ensures a positive fit of the engagement extension 31 received therein.

The formwork installation and removal process of the ceiling formwork system is described below with reference to Figure 5, whereby the advantageous design of the engagement extension 31 of the crossbars 20, in particular the mode of operation of the rotating nose 39 and spacer nose 44, 44', will be illustrated.

During the formwork process, several rows of longitudinal beams are created according to Figure 5, running parallel to one another, in which the end of a longitudinal beam 10' is suspended in the drop head 3' of a commercially available support 1' provided with this, which can be additionally aligned and secured in position using a tripod 2'; the longitudinal beam 10' is then raised by means of a next _support 1', in the drop head 3' of which the other end of the longitudinal beam 10' is suspended. In this case, the drop piece of the drop heads 3, 3' is in the upper formwork position.

In the longitudinal beam rows thus formed (&Igr;',&Igr;,&Igr;")

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from the ground, the crossbars 20 are hooked into the longitudinal beams 10 of a row on one side, whereby the hooked crossbar end is prevented from slipping by accommodating the rotating lug (only indicated here) in the support channel 14. The free crossbar end is now swung up from the ground using a rigging fork 19, i.e. without mobile scaffolds and stepladders or the like, according to arrow b and at the same time swung according to arrow c pointing out of the plane of the drawing in the longitudinal axis direction of the longitudinal beam 10' arranged parallel to the first longitudinal beam 10 with a crossbar lengths apart, so that the free crossbar end is guided past the longitudinal beam 10' and then the engagement extension 31 is introduced from above into the support channel 14 when lowered and is inevitably secured. During the pivoting process, the rotating nose forms a pivot point with the inner surface of the support channel 14 of the first longitudinal member 10 on the edge profile side, so that pivoting in the direction of arrow c is possible despite the appropriate mounting of the rotating nose as well as the spacer nose between the channel inner surfaces and thus the engagement extension 31 in the support channel 14.

The formwork panels 7 are then placed on the crossbars 20, 20', which are thus fixedly mounted between the longitudinal beams 10, 10', 10" in the longitudinal direction of the crossbar, after which the ceiling can be poured.

During the formwork removal process, the longitudinal beams 10, 10', 10"

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supporting drop pieces of the drop heads 3, 3', 3 ⁿ are lowered so that the entire longitudinal beam crossbar arrangement is lowered, after which one end of the crossbars 20, 20' can be unhooked by means of the fork 19 and then the crossbars 20, 20' can be removed. The supports 1, 1', 1 ^w still support the poured ceiling in some areas so that the longitudinal beams ¹⁰ , 10', 10" _for crossbars 20, 20' and formwork panels 7 are free for cutting and reuse.

Claims (1)

1. Ceiling formwork system, in particular for producing concrete ceilings, with cross bars (20) carrying formwork panels (7), which can be hooked in and out with their long ends between longitudinal beams (10) which run parallel and at a distance from one another and are each held so as to be hooked between erectable supports (1) in a drop head (3), wherein the cross bars (20) on opposite longitudinal beams each have a vertical extension running across the width of the cross bar. Crossbar''20) protruding engagement extension ( 31) arranged on the front side, which can be accommodated in a support groove (14) formed by an edge profile (13) and a top web (15) of the longitudinal member (10), characterized in that the engagement extension (31) has a spherical or convex elevation in the crossbar width direction on a rear surface (34) facing the edge profile (13) and on a front surface (35) facing the belt (15), in particular a rounded rotating nose (39) on the rear surface (34) and a rounded spacer nose (44,44') arranged on the front surface (35) opposite the rotating nose (39). 2. Ceiling formwork system according to claim 1, characterized in that the engagement extension (31) is designed in the shape of a polyhedron disk and has a /'■ ti *■■ · ■ lit! a » I · I · I »1 * t Crossbar bottom side (29) protruding vuafangseite Ii has a support surface (33) which is connected to the base surface (16) the receiving channel (14). %. 3 Ceiling formwork system according to claim 2, _{characterized} in that the nose* <3:J,44,44 ^J ) is transversely centered on the front surface (35) or the rear surface (34), that side surfaces (36) are provided to the side of the front surface (35) which run obliquely from this to the rear surface (24), and that the rear surface (34) has two pivoting surfaces (37, 37') which are arranged on both sides of a central surface area (38) having the rotating nose (39) and run obliquely towards the front side (35). 4. Ceiling formwork system according to one of claims 1 to 3, characterized in that the spacer nose (44, 44') which can be brought into contact with the flange web (15) has a semi-cylindrical cross-section running perpendicular to the crossbar central axis and to the crossbar width direction and preferably extends over the entire height of the engagement extension (31), possibly in two parts. J. Ceiling formwork system according to one of claims 2 to 4, characterized in that the rotating nose (39) has a hump-like shape which extends conically or triangularly from a contact surface (40) which is preferably slightly inclined relative to the vertical to the rear surface (39). 0.9 .&igr;·. tapered near the support surface (33). 6. Ceiling formwork system according to claim 5, characterized in that the distance (43) of the contact surface (40) to the crossbar underside (29, 29') is at least equal to the width of the edge profile (13). 7. Ceiling formwork system according to one of claims 2 to 6, characterized in that the support channel (14) has a trapezoidal cross-section that slightly converges to the floor surface (16), and that the spacer nose (44, 44') tapers slightly conically in the direction of the support surface (33), in particular at an angle (45) to the front surface (35) that is equal to the inclination (15") of the channel inner surface (15') of the belt web (15) forming the support channel (14). 8. Ceiling formwork system according to one of claims 2 to 7, characterized in that the spacer nose (44, 44*) extends to the vicinity of the support surface (33) and runs out in a rounded manner towards the front surface (35), and that the transition between the support surface (33) and the front surface (35) is also rounded or broken. 9. Ceiling formwork system according to claims 1 to 8, characterized in that the engagement extension (31) is formed on a front plate (30) which is arranged on the rear surface (34) of the engagement extension (31). ·· lilt «I «··» Ii ·» ■ III t ······ It S CSS > i &igr; I I t « · ■ · Connection area (32) can be connected to a crossbar (21). 10. Ceiling formwork system according to claim 9, characterized in that the front plate (31) is formed or fastened to an insert shoe (23) which can be positively attached to the longitudinal end regions of the crossbar beam (21) and which can optionally be additionally secured by fastening means (26, 27). 11. Ceiling formwork system according to claim 10, characterized in that the crossbar beam (21) is a square wooden beam with a plug-in area (22) that is preferably tapered at the end in beam width and/or beam height, and that the plug-in shoe (23) has a shoe trough (24) formed by a U-shaped steel or aluminum profile, to the side leg longitudinal edges of which the front plate (30) is welded.