GB2154261A

GB2154261A - Floor shuttering

Info

Publication number: GB2154261A
Application number: GB08432329A
Authority: GB
Inventors: Heinz Leclaire
Original assignee: H Krantz GmbH and Co
Current assignee: H Krantz GmbH and Co
Priority date: 1984-02-17
Filing date: 1984-12-21
Publication date: 1985-09-04
Also published as: IT8519532A0; GB2154261B; IT1183351B; NL8403939A; FR2559821A1; DE3405682C2; GB8432329D0; DE3405682A1; BE901750A; ZA851097B

Abstract

Lost shuttering, for use in producing a hollow flooring system, comprises plates 1 whose corners 2 are bent downwards and project into hollow profiles 3 which form feet of the shuttering. At each foot, one corner each of the several plates meeting at such foot are held in one hollow profile 3. Juxtaposed edges 4 of adjacent plates 1 are bent perpendicularly upwards and have edge margins 5 aligned parallel to the plane of the plates 1. The edges 4 and the edge margins 5 are held together by clamp profiles 6. Arranged at the lower ends of the hollow profiles 3 by way of angle brackets, are adjusting screws which permit vertical alignment and height adjustment of the hollow profiles 3. Leveling substance is applied over the shuttering, and this also fills the hollow profiles 3 and thus establishes a secure connection between the flooring which is formed by such substance and the carcass work or structure whilst leaving an underfloor cavity for services. <IMAGE>

Description

SPECIFICATION Shuttering This invention concerns shuttering.

Double-floor systems are known for permitting underfloor supply of work places with current, tele-communication, ventilation connections and other services. These leave, between the carcass work or underfloor structure and the flooring, an underfloor cavity which offers adequate space for extensive installation ductwork, which can perhaps subsequently be varied and/or supplemented.

In the design of such double-floor systems, it is generally known to produce the flooring with the aid of lost or permanent shuttering, that is to say shuttering which remains in situ after the flooring has been completed, and cannot be recovered for reuse.

This lost shuttering is composed of shuttering elements which are connectable to one another and which are arranged at a vertical spacing, leaving an underfloor cavity, relative to the carcass work. Feet co-formed on the underside of the shuttering elements define the vertical spacing relative to the carcass work. To the thus-formed lost shuttering there is applied a levelling substance which forms the flooring and which also fills the feet which are usually hollow in design, frusto-conical in configuration, and open on the shuttering side. In this way, the levelling substance provides flooring which is supported by way of solid feet, upon the carcass work.

The known shuttering elements, produced from plastics foil or sheet, and having feet coformed by a deep-drawing process can only recieve the initially unset levelling substance without unintentional deformation of the shuttering formed therefrom, when the shuttering elements are so designed that the flooring has an arched structure on the cavity side. However, even after setting of the levelling substance the arch structure is necessary, so that the flooring forms a stable substrate which possesses adequate bearing strength to support for example, dividing walls, which may, for example, be mobile. Besides, such flooring has to withstand all the loadings which occur in a modern building.

On the other hand, the cavity-side arch structure of the flooring has the disadvantage that the free cross-section of the cavity is considerably narrowed down. Subsequent incorportion of underfloor installations not provided for in the initially planned flooring system, are accordingly inhibited.

Moreover, the cavity-side arch structure of the flooring has the disadvantage that considerable quantities of the levelling substance are needed just for filling the hollow-designed frusto-conical feet of the shuttering elements so that sufficiently stable supports arise. The shuttering, composed of the shuttering elements, itself does not contribute to the load bearing capacity of the finished flooring.

The problem underlying the invention is to provide a form of lost shuttering which makes possible to achieve an optimum configuration for the free cross-section between the carcass work and the flooring and in addition to that allows cheap building materials, for example floor gypsum, to be used instead of a special levelling substance.

To solve this problem, the present invention provides lost shuttering consisting of shuttering elements, connectable to one another, for the production of flooring at a vertical spacing, leaving an underfloor cavity, relative to carcass work carrying the floor, by way of supports, in which feet, supportable on the carcass work, of the shuttering can be filled with a levelling substance which forms the floor, characterised in that the shuttering lements, that are to be arranged horizontally, comprise substantially flat plates which are stressable in tension and which are connectable in a tensile-strong manner at the corners of the plates to hollow profiles that are to be arranged vertically and form the feet of the shuttering and at the edges of the plates to respective adjacent plates.

The shuttering elements in accordance with the invention can be formed, for example, from four-sided, preferably square, sheetmetal plates, the corners of which can be securely fastened in any desired manner to the hollow profiles which form the feet of the shuttering. Because the neighbouring plate edges are connected together, one achieves shuttering which is subject only to comparatively lowflexure and which is sufficiently stable or rigid to carry a levelling substance which consists, for example, of floor gypsum and which is not yet set. In order to impart to the flooring, in the set state of the levelling substance, a particularly high inherent stability or rigidity, it is advisable to embed reinforcement rods or lattices in the levelling substance when it consists, for example, of floor gypsum.

In accordance with a preferred development of the invention, the plate corners are angled downwards perpendicularly to the plate plane, and a plurality of said corners, at each said foor, project into a common hollow profile which forms the respective foot of the shutting, so that they each butt against the inside of the hollow profile which is preferably formed from square tube.

This design, in accordance with the invention, makes it possible to secure the meeting plate corners of four plates to the inside of the respective square tube forming each foot.

The hollow profile which is formed from a square tube and which is open at both ends provides, for the shuttering, a foot which, when filled with levelling substance, leads to secure connection between the carcass work and the flooring. The flooring obtained with the aid of such shuttering has, as compared with the conventional frequently-used doublefloor construction comprising exchangeable plates, the advantage that the so-called "barrack-effect" (echoing of football sounds) does not occur, which even in the case of the above-described previously-known shuttering cannot be completely precluded because the hollowly-designed feet are closed at their ends facing the carcass work, so that the levelling substance cannot achieve a secure connection with the carcass work.

The shuttering elements of the invention can be assembled into particularly stable shuttering if, in accordance with a further development of the invention, the plate edges, bent upwards perpendicularly to the plate plane, of several plates are connected together in pairs each by at least one clamp profile which preferably extends over the full length of the plate edges: The connection in accordance with the invention of juxtaposed plate edges no only increases the tensile strength of the shuttering as a whole, but also prevents levelling substance from getting between two plate edges, if a gap should occur therebetween, and the underfloor cavity.

In accordance with a particularly advantageous development of the invention, the plate edges have edge margins which are additionally angled towards the plate centre, parallel to the plate plane, and are held together by clamp profiles which each comprise a web which engages over the two edge margins, and which merges into two convergingly-in dined limbs. The edges of the limbs serve to press the neighbouring plate edge pairs against one another very securely.

In order to permit simple compensation for carcass-work inaccuracies, a further develop ment of the invention has, fastened to the lower end of each square tube, horizontally aligned cantilevers or brackets through which are bores in which are vertically-disposed adjusting screws.

With this development, each foot of the shuttering can, independently, both be exactly aligned vertically and be so arranged heightwise that the upper ends of all the feet lie in an absolutely horizontal plane.

Finally, in a further development of the invention there is fastened on one side to the lower and of each square tube an angle profile which is longer than the side width or lateral width of the square tube and which is provided outside the width region of the square tube with two adjusting screws, whilst an angle profile fastened on the opposite side of the square tube is provided centrally with only one adjusting screw.

With this development are obtained a trian gular adjusting arrangement, which ensures that each of the adjusting screws is utilised proportionately for force transmission. Moreover, the triangular arrangement of the adjusting screws facilitates, in particular, the vertical alignment of each foot of the shuttering.

The invention will be described further, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a plan view illustrating four complete shuttering elements, and portions of adjacent shuttering elements, all of which are constructed in accordance with the present invention, and are connected to one another to form part of a shuttering installation; Figure 2 is a diagrammatic sectional elevation taken as indicated by the line ll-ll of Fig.

1; Figure 3 is a view comparable with Fig. 2 but showing the shuttering after a levelling substance has been applied thereto to form a hollow floor structure; Figure 4 is a diagrammatic perspecitve exploded view of one of the shuttering elements of Figs. 1 to 3, with three of its associated feet; Figure 5 is a side view, to a scale enlarged as compared with Figs. 1 to 4, illustrating a modified embodiment of foot; Figure 6 is a plane view of the foot of Fig.

5; Figure 7 is an enlarged fragmentary section through the edge regions of two of the shuttering elements, the section corresponding to the line VII-VII of Fig. 1; and Figure 8 is a section, comparable with Fig.

7, through the edge region of the same two shuttering elements, but showing a superimposed clamp profile, the section being taken in accordance with the line VIII-VIII of Fig. 1.

The illustrated shuttering conforming to the invention is composed of a plurality of substantially flat square plates 1. The four corners 2 of each plate 1 are bent downwards perpendicularly to the plate plane, and where they register with one another one plate corner 2 each of four plates 1 project down into a hollow profile 3 forming a respective foot of the shuttering and butts against the inside of the foot, the profile 3 consisting of a square tube. The edges 4 of the plates 1 are each bent perpendicularly to the plate plane, so that the edges 4 of neighbouring plates are juxtaposed and butt against one another. Con figurations with the plate edges 4 are respective inwardly-bent edge margins 5 which lie in a plane parallel to the plate plane and each extend inwards of the respective plate. A respective clamp profile 6 engages over each pair of the eges 4, with their edge margins 5 and thus connect neighboring plates 1 to one another in a tensile-strong manner.

As shown more especially in Figs. 5 and 6, each hollow profile 3, formed from square tube, is open at both ends. In the develop ment illustrated in these figures, welded on the outside on the lower end of each hollow profile 3, on one side, is a cantilever angle iron or bracket 7 and on the opposite side a further such angle iron or bracket 8. The angle bracket 7 projects at both sides, beyond the width region of the hollow profile 3 and has, one in each of the projecting portions, two threaded bores 9, whilst the angle bracket 8 corresponds to the width of the hollow profile 3 and is provided with only one threaded bore 9. Screwed in each said threaded bore 9 is a respective adjusting screw 10 by means of which the hollow profile 3 can be varied in its effective height and can be aligned vertically.

As shown in Figs. 1 to 3, the plates 1 are located on the appropriately aligned legs provided by the hollow profiles 3 and their neighbouring or adjacent edges are pressed firmly against one another by means of the clamp profiles 6.

If desired, intentional connections form a room space (i.e. space above the flooring system) to an underfloor cavity 11, between carcass work 1 2 and flooring 13, formed by applying setting levelling material 1 5 over the shuttering, can be established by way of perforations or apertures 14 which are provided in one or more the plates 1 and which can be produced after finishing of the flooring 1 3. If the apertures 14 are present in the plates 1 prior to application of the levelling substance 15, they may include, for example air outlets 16, so that these can be cast securely into the levelling substance 1 5 (see Fig. 3).

If the levelling substance 1 5 consists of floor gypsum, then it is advisable, for improving the bending strength of the flooring 13, to embed, in the lower third of the height of the levelling substance 15, a reinforcing mat 1 7 which is shown in Fig. 3 in broken lines. This can, for example, rest directly on the clamp profiles 6 and extend continuously over a number of the plates 1 or even over the entire shuttering.

As soon as the applied levelling substance 1 5 has hardened, the clamp profiles 6 are prevented from expanding even if exceptionally high loadings should be imposed on the resultant flooring. It is, therefore, sufficient if the clamping force of the clamp profiles 6 is sufficiently great that the applied levelling substance, in the still not set state, does not allow an expansion to occur as a result of tensile stressing of the plates 1.

Claims

1. Lost shuttering consisting of shuttering elements, connectable to one another, for the production of flooring at a vertical spacing, leaving an undefloor cavity, relative to carcass work carrying the floor, by way of supports, in which feet, supportable on the carcass work, of the shuttering can be filled with a levelling substance which forms the floor, characterised in that the shuttering elements, that are to be arranged horizontally, comprise substantially flat plates which are stressable in tension and which are connectable in a tensile-strong manner at the corners of the plates to hollow profiles that are to be arranged vertically and form the feet of the shuttering and at the edges of the plates to respective adjacent plates.

2. Shuttering as claimed in claim 1, characterised in that the plate corners are angled downwards perpendicularly to the plate plane, and a plurality of said corners, at each foot project into a respective common hollow profile forming the respective foot of the shuttering and each butt against the inside of the hollow profile which is formed from square tube.

3. Shuttering as claimed in claim 1 or 2, characterised in that plate edges are bent upwards perpendicularly to the plate plane, and the edges of adjacent plates are connected to one another in pairs each by at least one clamp profile.

4. Shuttering as claimed in claim 3 wherein the clamp profile extends over the full length of the respective plate edges.

5. Shuttering as claimed in claim 3 or 4 characterised in that the plate edges have edge margins which are furthermore angled towards the plate centre, parallel to the plate plane, and the clamp profiles each comprise a web which engages over two edge strips and which merges into two convergingly-inclined limbs by way of which the adjacent plate edges can be pressed against one another.

6. Shuttering as claimed in any preceding claim characterised in that fastened to the lower end of each hollow profile are horizontally-aligned cantilevers or brackets through which are bores in which are vertically disposed adjusting screws.

7. Shuttering as claimed in claim 6, characterised in that fastened on one side to the lower end of each hollow profile is an angle bracket which is longer than the corresponding width of the hollow profile, and is provided outside the width region of the hollow profile with two of the adjusting screws, whilst an angle bracket fastened on an opposite side of the hollow profile is provided centrally with only one adjusting screw.

8. Lost shuttering substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

9. A cavity floor system comprising shuttering as claimed in any preceding claim over which is applied a civering of levelling material which also fills the feet.