DE1916904A1 - Composite ceiling - Google Patents

Description

Thyssen Industrie GmbH 69/201

Dinslaken

Composite ceiling

The invention relates to a composite ceiling for buildings with a profiled panel arranged on the underside Sheet metal, especially trapezoidal sheet metal, and with one resting on it Concrete layer.

A composite ceiling is already known in which a bond between sheet steel and the in-situ concrete lying on it is exclusively caused by the adhesion between concrete and sheet metal. However, this is relatively low. Hence the Load-bearing capacity of such a ceiling is relatively low.

In another known blanket, the underside consists of sheet metal strips lying close to one another, with the longitudinal edges bent up at right angles. Through an in-situ concrete layer the sheets are completely covered. The bond between sheet metal and concrete is made by connecting elements, which penetrate the developed edges of two adjacent sheets and protrude from the sheets.

In other known ceilings, the bond between sheet metal and in-situ concrete is achieved by on the top of the profiled sheet metal panels welded structural steel fabric mats. A disadvantage of this and the aforementioned blankets is that that a large part of the concrete is near or below the neutral Paser and therefore to the load-bearing capacity contributes nothing to the ceiling. The load-bearing capacity is therefore relatively low compared to the weight of the ceiling. Large spans cannot be bridged.

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Furthermore, a ceiling is known in which trapezoidal sheets rest on ceiling beams that. are formed from I-profiles. the Trapezoidal sheets are covered with an in-situ concrete layer. Between this in-situ concrete layer and the ceiling beams is through Bolts made a composite, which are welded to the girders and penetrate the trapezoidal sheets in the area of the beads. In the gaps between the ceiling beams there is between the concrete layer and the trapezoidal sheets, apart from the low adhesion, no bond. In this ceiling, the trapezoidal sheets primarily only serve as permanent formwork for the concrete slab.

The object of the invention is to create a ceiling of the type mentioned at the outset, in which with optimal use the strength of the steel and the concrete with a low dead weight a high load-bearing capacity is achieved and therefore large spans are possible.

According to the invention, the metal sheets are provided on their upper side with a plurality of bolts, which are preferably on the ribs are welded in rows and protrude into the concrete layer.

In one embodiment of the invention, the concrete layer is applied as in-situ concrete.

To reduce the weight of the ceiling, light fillers are preferably placed in the corrugations of the metal sheets Tubes, inserted.

In an expedient embodiment, the filling body> ■ protrude with part of their cross-section, preferably at least with half the cross-section, over the ribs of the metal sheets back being connected.

In another very advantageous embodiment of the invention is the concrete layer from a number of. Prefabricated parts

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Composed in the form of rectangular concrete slabs, the are laid next to one another at right angles to the profiling of the metal sheets, with the bolts of the metal sheets in the intended recesses in the concrete slabs filled with concrete or preferably in the concrete-filled joints between the be « clay slabs protrude. According to the invention, the concrete slabs, especially in the lower part of its cross-section, in Longitudinal recesses, e.g. cavities. It is also recommended according to the invention, between the Insert strips of insulation material into the sheet of lead and the concrete layer. The metal sheets are expediently galvanized on both sides.

The drawing shows preferred exemplary embodiments of the invention shown.

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Fig. 1 shows a section through a trapezoidal sheet transversely to the direction of the ribs and beads,

Fig. 2 shows a plan view of a trapezoidal sheet according to Fig. 1 /

Fig. 3 shows a section through a ceiling in the longitudinal direction of the trapezoidal sheet,

Fig. K shows a plan view of a ceiling, partially in section,

Fig. 5 shows a cross section through another ceiling transversely to the longitudinal direction of the trapezoidal sheet,

FIG. 6 shows a plan view of a trapezoidal sheet metal of the ceiling shown in FIG. 5.

On the ribs 2 of a galvanized trapezoidal sheet 1, bolts 3 are welded, which are perpendicular to the surface of the Stand sheet metal. There are a number of such bolts on each rib. The number of bolts depends on the

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required anchoring forces. With the one shown Embodiment are two bolts 5 in pairs next to each other arranged. The distances between the individual pairs of bolts are all the same. The ones on the different Ribs 2 arranged bolts are all aligned with one another and form lines that extend transversely to the ribs.

Alternatively, the trapezoidal sheet metal is covered with precast concrete slabs 4. These have the shape of elongated, narrow rectangles, the width of which corresponds to the distance between two rows of bolts is equivalent to. They are laid side by side across the ribs 2 and beads of the metal sheets 1, so that each concrete slab ™ lies between two adjacent rows of bolts. Bolts

3 protrude into those located between two adjacent concrete slabs 4 Grout 5 into it. The joints 5 are cast with concrete. This creates a non-positive connection between the. Trapezoidal sheet 1 and the concrete reached. The concrete slabs 4 are provided with longitudinal cavities 6. These are arranged in such a way that they are mostly in the lower part of the concrete slab. This achieves, that with as little as possible Plate weight, the distance between the compressive force-absorbing concrete cross-section and the tensile force-absorbing steel cross-section of the trapezoidal sheets 1 becomes large and moreover concrete distribution that is favorable for fire protection

* stands. Between the concrete slabs 4 and the ribs 2 of the trapezoidal sheets are - not shown in the drawing - inserted strips of insulation, through which an improved edition and structure-borne sound insulation is achieved. The concrete slabs

4 can in themselves be unreinforced. Only for transport and for better lateral distribution with larger individual loads it is advisable to provide reinforcement.

In another embodiment of the ceiling according to the invention, the trapezoidal sheets 1 are covered by an in-situ concrete layer 8. In the corrugations 7 of the trapezoidal sheets, pipes 9 made of light material are inserted before the in-situ concrete is poured.

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placed, which protrude upwards far beyond the ribs 2. on In this way, the concrete layer is given a rib-like structure.

When the ceiling according to the invention is subjected to bending stress, the tensile forces act practically exclusively in the area of the trapezoidal sheets 1. Most of the concrete is in any case above the neutral Paser on the pressure side. By this arrangement achieves an optimal interaction of the two materials. The bottom of the ceiling is made for reasons the fire safety, for example, covered with a cladding material.

Patent claims:

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Claims (1)

Patent claims: Composite ceiling for buildings with panels made of profiled sheet metal, in particular trapezoidal sheet metal, arranged on the underside, and with a layer of concrete applied thereon, characterized in that the metal sheets (1) on their upper side are provided with a plurality of bolts, which are preferably welded in rows on the ribs (2) and protrude into the concrete layer (4, 5, 8). W 2. composite ceiling according to claim 1, characterized in that the concrete layer (8) is applied as in-situ concrete. 5 · composite ceiling according to claim 2, characterized in that light fillers, preferably tubes (9), are inserted into the beads (7) of the metal sheets (1). 4. composite ceiling according to claim 3, characterized in that the filling body (9) with part of its cross-section, preferably at least half the cross-section, over the Ribs (2) protrude. * 5 · composite ceiling according to claim 1, characterized in that the concrete layer is composed of a number of prefabricated parts in the form of rectangular concrete slabs (4) which at right angles to the profiling of the metal sheets (l) next to one another are laid, and that the bolts in recesses provided for this purpose in the concrete slabs (4) or preferably cast with concrete in the grouted with concrete joints (5) between the concrete slabs (4) protrude. 6 .. composite ceiling according to claim 5 * characterized in that the concrete slabs (4), in particular in the lower part of their cross-section, have recesses running in the longitudinal direction of the slab, e.g. cavities (6). 009841/0905 _ _? _ 7. composite ceiling according to claims 1 to 6, characterized in that that strips of insulating material are inserted between the metal sheets (1) and the concrete layer. 8. composite ceiling according to claims 1 to 7 »characterized in that that the metal sheets (l) are galvanized on both sides. 009841/0905 Blank page