EP0256242B1 - Self-supporting composite building slab, especially false floor slab - Google Patents

Abstract

A shallow pan, preferably of tin-coated sheet steel, serves for the production of a self-supporting composite plate, wherein the pan forms the outside wrapper for a filler with high compression resistance, e.g., anhydrite. The pan contains a plurality of punches which provide anchoring with the filler material. To increase the bearing strength of the composite plate, the pan bottom is made up of four intersecting, shallow, bulged-out zones. These zones engage in the middle on a smooth, plate-like elevation and extend each in turn from deep areas along the intersecting symmetry axes of the pan toward the highest areas at each pan corner. The density of the punches in the pan bottom preferably increases from the inside toward the outside.

Description

The invention relates to a self-supporting composite building board, in particular raised floor slab with a rectangular plan and a flat trough, preferably made of sheet metal, as external reinforcement for a pourable and pourable state in the trough and cured therein with high pressure resistance, z. B. anhydrite, with at least the tub base provided with numerous, the composite (anchoring) with the filling material producing punches and the tub bottom is also profiled.

A self-supporting composite building board of the above type, the outer trough-shaped reinforcement of which, however, has a flat bottom, is known from DE-PS 2 004 101 (or EP-A-0152609). Further developments of this composite building board are already known (cf. brochure of the company MERO-Werke "MERO-Doppelboden" D 488 2/79), in which the bottom, the sheet metal tub serving as external reinforcement, has radially extending beads from the center outwards , which merge into a surround surrounding the edge of the tub floor. In addition, with this type of composite building board, the tub floor was arched from the outer edges towards the center of the floor. This means that the filler material, e.g. B. anhydrite, its smallest thickness in the middle of the plate, its largest Thickness throughout in the area of the four outer edges of the composite building board. It has been found that the load-bearing capacity or resilience of this composite building board construction, in particular when used for raised floors, is relatively limited and does not meet particularly high requirements. Such double floor panels are known to be supported only at their corners on supports and their critical locations at very high loads, in particular point loads, are in the middle of the four outer edges of the base plate. The use of stronger sheet metal material for the outer trough-shaped reinforcement and / or an increase in the plate thickness are ruled out for various reasons.

The invention has for its object to provide a cantilever composite panel, in particular raised floor slab with higher load capacity compared to the prior art, while maintaining the previous plate height and material thickness for the tub-shaped outer reinforcement.

According to the invention, the above object is achieved with a self-supporting composite building board of the type described in the introduction in that the trough bottom has four essentially cruciformly arranged, flat-arched zones, each of which extends from deep areas in the center of the floor and along the cruciform axis of symmetry of the trough to the highest Extend the area next to each bath corner. Through this special profiling of the bottom of the tub forming the outer reinforcement for the filler material, such cross-sectional profiles are advantageously achieved in the hardened filler material, particularly in the critical four edge areas of the composite building board, that the The load-bearing capacity of such a self-supporting composite building board is up to 50% higher than that of the prior art explained at the outset, in fact with practically the same board weight. The trough with the bottom profiled according to the invention can be produced economically from sheet metal using the deep-drawing process. However, it is also possible to manufacture the tub from high tensile strength plastics. It is important that at least in the tub floor, but preferably also in the side walls of the tub, punches or the like. A sufficient number are provided to ensure the required bond between the tub material and the hardened filler material.

Embodiments of the invention emerge from the subclaims. It is Z. B. useful if the apex lines rising outwards against the tub corners of the four curved zones coincide with the diagonals of the tub.

If, according to a further embodiment of the invention, a flat, plate-shaped elevation is provided in the middle of the tub floor, the height of which, measured from the deep areas of the tub floor along the axes of symmetry of the tub, is only a fraction of the greatest height of the tub floor in the areas next to the tub corners, An undesirable snap effect is avoided due to tensions in the tub floor, which can be created when the four flat, domed zones are formed.

According to yet another development of the invention, the greatest height of the arched tub floor in the areas next to the tub corners is expediently one fourth to one fifth of the overall height of the tub. The degree of deformation of the tub floor is thereby advantageous kept relatively small. This is not only favorable in terms of production technology, but also with regard to the material thicknesses of the tub base after the deformation process.

If, according to yet another embodiment of the invention, a peripheral bead with a flat bottom is formed in a manner known per se in the edge region of the tub bottom next to the side walls of the tub, the level of which runs somewhat below the deepest areas between the four curved zones of the tub bottom, one is advantageous Touching the profiled trough floor within the surrounding bead with a raw floor or the like. When placing the composite building board on this, for. B. avoided during storage or during assembly of the composite building board.

Fig. 1

eine Draufsicht auf eine flachbauende Stahlblechwanne, die bei der Herstellung einer freitragenden Verbundbauplatte als äußere Bewehrung für einen Füllstoff hoher Druckfestigkeit, z. B. Anhydrit, dient und den erfindungsgemäß profilierten Boden aufweist;

Fig. 2

eine Schnittansicht entlang der Linie II-II in Fig. 1;

Fig. 3

eine Schnittansicht entlang der Linie III-III in Fig. 1 im vergrößerten Maßstab;

Fig. 4

eine Schnittansicht entlang der Linie IV-IV in Fig. 1, gleichfalls im vergrößerten Maßstab und

Fig. 5

eine Seitenansicht mehrerer freitragender Verbundbauplatten im montierten Zustand, welche die in den Figuren 1 bis 4 gezeigte Stahlblechwanne enthalten und einen Doppelboden bilden.

The invention is subsequently explained with reference to the drawings of an exemplary embodiment. Show it:

Fig. 1

a plan view of a flat sheet steel pan, which is used in the manufacture of a cantilever composite building board as an external reinforcement for a filler high pressure resistance, for. B. anhydrite, and has the soil profiled according to the invention;

Fig. 2

a sectional view taken along line II-II in Fig. 1;

Fig. 3

a sectional view taken along the line III-III in Figure 1 on an enlarged scale.

Fig. 4

a sectional view taken along the line IV-IV in Fig. 1, also on an enlarged scale and

Fig. 5

a side view of several cantilever composite building boards in the assembled state, which contain the steel sheet tray shown in Figures 1 to 4 and form a raised floor.

The tub (10) chosen as the exemplary embodiment consists of deep-drawn steel sheet galvanized on both sides and forms the outer reinforcement for a filler material (11), preferably anhydrite, which is introduced in the flowable state and hardened in the tub (10), around a raised access floor panel (12) (Fig. 5) with a square floor plan. These raised access floor panels (12) have a covering (13) and are supported with their corners on footrests (14) so that the outer edges of the raised access floor panels (12) touch. The footrests (14) are in turn set up on a bare floor (15).

The sheet steel pan (10) has z. B. a side length of about 600 mm and is with a height of z. B. approx. 33 mm relatively flat.

The steel sheet trough (10) has a specially profiled floor (16) from which the four side walls (17) extend upwards in order to increase the load-bearing capacity or resilience of the raised floor plate (12). The upper edge of these side walls (17) is designed as an outwardly angled flange (18).

The edge area of the tub floor (16) contains a uniformly deep and wide surrounding bead (19) with a flat bottom. Only at the four corners of the tub (10) is the bead (19) at (20) widened inward and provided with a flat angular recess (21) with which the tub (10) on the Footrests (14) (Fig. 5) is supported. Within this circumferential bead (19), the trough base (16) is provided with four flat, domed zones (22) and a flat, plate-shaped elevation (23) in the center of the base. The four arched bottom zones (22) are arranged symmetrically in such a way that they each extend from deep areas along the cruciform symmetry axes (24) of the tub (10) and from the flat plate-shaped elevation (23) in the middle of the tub bottom to a highest area (25). Extend next to each tub corner, the apex lines of the arched zones (22) rising outwards against the tub corners coinciding with the diagonals (26) of the tub (10). As can be seen in particular from FIG. 4, the height of the plate-shaped central elevation (23) is only about half the greatest height of the tub floor (16) in the areas (25) next to the tub corners. The same figure also shows that the greatest height of the tub floor (16) in the areas (25) is only about a quarter to a fifth of the overall height of the tub (10). The filler material (11), preferably anhydrite, which has been introduced into the tub (10) and hardened therein, is given a cross-sectional profile, in particular in the edge zones of the tub (10), which shows the load-bearing capacity or resilience, due to the profiling of the tub bottom (16) described above the finished composite building board (12) increased considerably compared to previous similar constructions.

In order to obtain the required bond between the steel sheet trough (10) and the hardened filler material (11), numerous punches (27) have been worked out in the side walls (17) and in the trough base (16). These punctures (27) are understood to mean openings which are punched out of the tub base (16) or the side walls (17) in this way be worked out so that inwardly protruding, frayed edges arise which are embedded in the filler material (11), which also penetrates into the openings of the punches (27). So that the filler material (11) in its flowable filling state does not flow out through the openings of the punches (27), the latter are z. B. sealed by on the outer sides of the side walls (17) and the tub base (16) foils. The distribution of the punches (27) in the tub floor (16) is also important for the high load-bearing capacity or resilience of the finished raised floor plate (12). The density of the punches (27) is lowest in the middle of the trough bottom in the area of the plate-shaped elevation (23), while their concentration is greatest at the edges of the trough bottom (16) compared to the surrounding bead (19) or the side walls (17) . A series of closely adjacent punches (27) is provided here. In deviation from the exemplary embodiment, a plurality of rows of closely adjacent punches (27) running parallel to one another can also be arranged. It is essential that the density of the punches (27) increases from the center of the tub bottom to the outside. The punches (27) can also be arranged regularly or irregularly in the tub floor (16).

Although the preferred filler material (11) is anhydrite, other flowable or pourable and hardenable materials, e.g. B. concrete, find application. It is crucial that these filler materials have the required high compressive strength in the hardened state and enter into the necessary bond with the tub material.

Claims (5)

1. A self-supporting composite building slab, more particularly a false floor slab which is rectangular in plan and has a shallow trough, preferably of sheet metal, as an outer reinforcement for a material with high crush resistance, e.g. anhydrite, filled into the trough in a flowable or pourable condition and hardened therein, the trough base at least being provided with numerous indentations producing the binding (anchoring) with the filler material, and the trough base is in addition profiled in cross-section, characterised in that the trough base (16) has four substantially-cruciformly-disposed, shallow-arched zones (22), which extend respectively from deep areas in the centre (23) of the base and along the cruciform axes of symmetry (24) of the trough( 10), towards a highest area (25) next to each trough corner.
2. A composite building slab according to Claim 1, characterised in that the apex lines (26) of the four arched zones (22), rising in an outward direction towards the trough corners, coincide with the diagonals ( 26) of the trough (10.
3. A composite building slab according to Claim 1 or 2, characterised in that there is provided in the centre of the trough base a low-profile plate-shaped raised portion (23), whose height, measured from the deep areas of the trough base (16) along the axes of symmetry (24) of the trough (10) are only a fraction of the maximum height of the trough base (16) in the regions (25) next to the trough corners.
4. A composite building slab according to one of Claims 1 to 3, characterised in that the maximum height of the arched trough base (16) in the regions next to the trough corners is a quarter to a fifth of the constructive height of the trough (10).
5. A composite building slab according to one of Claims 1 to 4, characterised in that there is moulded into the edge region of the trough base (16) next to the sidewalls (17) of the trough (10), in a way known per se, a surrounding bead (19) with a flat base, whose plane extends slightly below the deepest areas (24) between the four arched zones (22) of the trough base (16).

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