WO1986002120A1

WO1986002120A1 - Flexible bearing sheet and utilization thereof for floors

Info

Publication number: WO1986002120A1
Application number: PCT/CH1985/000138
Authority: WO
Inventors: Hans-Peter RÜFENACHT; Georg Max HÜRLIMANN
Original assignee: Bta Boden-Technik Ag
Priority date: 1984-10-04
Filing date: 1985-09-30
Publication date: 1986-04-10
Also published as: NL8520306A; DE3590472D2; EP0197957B1; EP0197957A1; CH654059A5; DE3562152D1; DE8518325U1

Abstract

A flexible bearing sheet having connection areas respectively covering areas (12) comprises, arranged regularly in the longitudinal and transversal directions, recesses (10) on one side which are directed downwardly and form with adjacent bearings vault-like cavities. Said recesses are sealed in order to receive a self-hardening fluid material. The recesses (10) have a square, respectively rectangular-horizontal section at each level and, in the upper area, they have a fold (14) extending horizontally and separating the upper planar walls (16) from the lower skewed walls (20). In the area of the four edges of the upper pyramidal trunk (18) there are provided reinforcement mouldings (24) which extend up to the planar area of the edges (26) of the lower pyramidal trunk (22). The sheet support element is used in the civil engineering and building industries, particularly as formwork of floors cast on the site.

Description

Load-bearing, bendable support film and its use for top floors

The invention relates to a tragf ^'ähige, bendable St tzfolie with shock or OVERFLOW appungszonen and arranged regularly in the longitudinal and transverse directions ässig in distance ein¬ each other by shaped bottom wells that tight packaging for receiving a closing f1 i edible, self-curing mass are suitable, the supporting film resting with the recesses on an essentially flat base forming vault-like cavities. The invention further relates to the use of the support film as a formwork for the production of in-situ hardening floors.

From DE-PS 1 127 817 a film stiffened by forming depressions is known which as a moisture and vapor barrier, possibly also sound and heat insulating component in high, low, water and road construction is usable. The pyramid-shaped depressions form contiguous hexagons. As a result of the hexagonal arrangement, the depressions which are directly adjacent to one another should almost equalize the bending strength in all directions. The side surfaces of the walls are convexly curved and their bottoms are preferably thicker than the side walls.

When used in floor construction, the film designed according to DE-PS 1 123 817 is placed directly on the bare ceiling. The edges of the foils are laid overlapping and, for example, glued to one another with bitumen or welded in place using appropriate tools. The screed material is placed on the barrier layer of foils laid in this way. Furthermore, DE-OS 31 03 632 describes a hollow floor with an upper floor resting on supporting feet on a sub-floor and forming a cavity with this. The support feet are designed in the form of circular knobs which, when filled with the material of the top floor, form molded parts with a smooth coating. The support feet are molded onto the top floor and form a vault-like structure without flat side surfaces. The circumferential walls of the support feet meet the sub-floor essentially perpendicularly. The circumferential walls of the support feet, continuously widening upwards, merge into the horizontal top floor without kinks. The underbody supporting the supporting feet has a smooth coating.

The inventors have set themselves the task of creating a load-bearing, bendable supporting film with depressions which are shaped downwards on one side and are suitable for receiving a flowable mass which cures on the spot and which is used in particular as a formwork formwork Production of top floors hardening therein is used, has a high load-bearing capacity and is simple and inexpensive to manufacture.

The object is achieved according to the invention by

- At each level, essentially square or rectangular recesses which have flat side walls with a horizontally circumferential kink in the upper half thereof, the kink into an upper straight truncated pyramid with flatter side walls and a lower straight one Truncated pyramid with steeper but clearly diverging side walls, and

reinforcing beads formed at least over the area of the four side edges of the upper truncated pyramid and the corners of the kink, which begin in the edge and in the flat area of the four side edges of the lower truncated pyramid run out.

The reinforcing beads, which extend along the side edges of the upper truncated pyramid over the kink, play an essential role in that they both significantly increase the load-bearing capacity and - in cooperation with the kink - effectively counteract torsional forces In terms of effectiveness, it has proven to be particularly advantageous to narrow the cross section of the reinforcing beads downwards. For technical reasons, trapezoidal and semicircular cross sections are particularly suitable.

With regard to the carrier function of the support film and in particular also the mass hardening therein, the transition of the reinforcing bead into the flat area of the side edges of the lower truncated pyramid is particularly delicate. This transition is therefore preferably not made via a kink, but the underside of the reinforcing bead merges tangentially into this areal area in a curved form.

Depending on the dimensions and the requirements for the support film, the reinforcing beads are preferably 5-20 mm wide and deep, preferably 10-15 mm.

It has proven to be expedient to make the support film 0.3-1 mm thick. On the one hand, this must not be too thin in order not to reduce the load-bearing capacity to an extent that is no longer acceptable. On the other hand, however, it must not be so thick that, with the material used accordingly, the heat transfer is insulated too much and the production is too expensive.

Measure the horizontal side lengths of the square or almost square, i.e. rectangular recesses in the uppermost area, preferably 5 - 25 cm, at the bottom, at the contact surface of the recesses, also called support feet, preferably 1 - 5 cm.

In practice, the angle (s) of inclination of the side faces of the upper truncated pyramid with respect to the horizontal is preferably between 10 and 60 "(old division), in particular at 15-30 °. A small angle has the advantage "On the one hand, little material is needed to fill the support film, and on the other hand, a voluminous cavity can form below the support feet. The lower limit for the angle (s) of inclination, however, is the resilience of the top floor, which is also outside the area the contact surface of the support feet must be secured. A relatively steep angle of inclination or the side faces of the upper truncated pyramid, on the other hand, results in high material consumption, reduces the cavities, but on the other hand ensures a regularly distributed high load capacity of the The optimal angle of inclination ^ is determined from the requirements placed on the top floor st that four identical inclination angles are formed in the case of a square horizontal cross section, whereas in the case of a rectangular cross section two opposing inclination angles are the same. The more the aspect ratio of sides of the rectangle deviates from 1, the more different are the two inclination angles o> which are not opposite one another.

The angle of inclination β of the side surfaces of the lower truncated pyramid is always greater than the angle of inclination n. The angle of inclination β is / are preferably in the range of 30-80 °, in particular 60-75 ^* . Here, too, various aspects have to be taken into account in order to optimize the angle of inclination β, for example the consumption of filler material and the load-bearing capacity and, in the case of top floors made with the film, the potential danger of jamming installation cables in the cavity formed below the support elements . - z> -

Conventional materials and processes are used to produce the support film. The support film preferably consists of a thermoplastic, in particular of polyvinyl chloride (PVC), polyolefins, such as polyethylene (PE) or polypropylene (PP), or polyaromatics, such as polystyrene (PS). These materials have the advantage that they can be melted or burned by a hot air stream after the top floor has hardened, which ensures good thermal conductivity of the top floor. Support foils made of thermoplastic are manufactured using the usual lace processes.

The support foils can, however, also consist of a metal that is easy to deep-draw, for example aluminum or aluminum alloys. Metal foils do not have to be removed after the top floor has hardened because they are thermally highly conductive.

Since the heat transfer should only be good from the cavity to the top floor, but not from the bottom floor to the top floor, insulation can be provided in the lowest region of the lower truncated pyramid. This can be done in a known manner by inserting appropriately shaped, heat-insulating platelets, for example made of cork or an organic or ceramic rigid foam. However, the bottom area of the lower truncated pyramid is covered more easily and cheaply with a portion of heat-insulating powder or porous granules. The thermal insulation can be introduced before or after the installation of the support films on the construction site.

The support foils are preferably produced and stored in the form of plates, but in the form of rolls. The outermost recesses can be placed one inside the other for simplified assembly. Furthermore, the edge area can have means for connecting film webs or plates. In particular, those known from the packaging industry Flares are used, which only need to be put together and pressed together. Instead of pressing together, however, a self-curing adhesive or a thermal lacquer can also be used. Instead of exchanges, however, it is also possible to form grooves which can be changed and which in turn can be easily glued or tightly connected by thermal treatment.

If it is justifiable from a scientific point of view, further measures known per se can be taken:

- Installation of reinforcement materials made of thermoplastic or metal,

Formation of further vertical, horizontal and / or diagonal reinforcing beads,

- Thicker formation of the critical points of the foils, for example the reinforcing beads in the area of the side edges of the upper truncated pyramid and the flat area of the side edges of the lower truncated pyramid. Although the support film has a wide range of uses in the field of civil engineering, it is primarily used as a formwork for the production of in-situ curing top floors. For this purpose, the support film with its depressions or the support feet is placed on the cleaned, untreated floor or provided with a protective layer, the transition points between the plates or sheets of the support film are sealed, if necessary, and a flowable mass is poured in. If the flowable mass consists of a suspension, it is self-leveling, takes up a horizontal position and forms a smooth surface. If the flowable mass is of greater consistency, it must be smoothed out. Concrete, for example, has been found to be flowable masses or screed that has good load-bearing capacity with high heat conduction.

Since the arch structure of the top floor corresponds exactly to the shape of the support film, it is essential that the design of this support film takes into account not only its load-bearing capacity but also that of the later top floor. Therefore uss critical points, such as Great attention is paid to the configuration of the reinforcing beads and their transition into the flat area of the side edges of the lower truncated pyramid.

The invention is explained in more detail with reference to the drawing. They show schematically:

1 shows a plan view of a depression in the supporting film with a peripheral edge area,

FIG. 2 shows a vertical line through a support film according to FIG. 1, with a lower one of different lengths

Truncated pyramid, and

- Fig. 3 shows a section of a support film with four wells spaced from each other.

The recess 10 of a support film shown in FIG. 1 is square in cross section. A surrounding edge 12 lies in the plane of the film. A horizontally circumferential bend 14 separates the depression into two truncated pyramids, the side surfaces 16 of the upper truncated pyramid 18 being flatter than the side surfaces 20 of the lower truncated pyramid 22. In the region of the side edges of the upper truncated pyramid 18, reinforcing beads 24 are formed. which have a trapezoidal cross-sectional shape tapering downwards. The reinforcing beads 24 begin in the edge region 12 and end in the flat region of the four side edges 26 of the lower truncated pyramid 22. The bottom surface 28 of the depression 10 is octagonal in the present case.

2, indentations 10 with different high lower truncated pyramids 22 are indicated, but only the lowest area of the indentation, which serves as a supporting foot in the finished hollow floor, is shown. The inclination of the side surfaces can be seen particularly well from this figure. The side surfaces 16 of the upper truncated pyramid 18 have the angle of inclination,, which is significantly smaller than the angle of inclination β of the side surfaces 20 of the respective lower truncated pyramids 22.

2 that the depth of the reinforcing beads 24 increases from top to bottom and that the bottom of the curve merges tangentially into the flat area 26 of the side edges of the lower truncated pyramid 22. These features are important for the load-bearing capacity of the support film and in particular for the upper floor that it forms.

FIG. 3 shows how four adjacent depressions 10 of a support film are formed. However, the width of a film web can e.g. four to twenty indentations, depending on the dimensions of indentations and film web.

Claims

1. Load-bearing, bendable support film with impact or overlay zones and spaced regularly in the longitudinal and transverse directions at intervals, formed on one side downwards, which are tightly sealing to accommodate a highly edible, self-curing Mass are suitable, the supporting film resting with the depressions on an essentially flat base forming vault-like cavities,

marked by

- At each level essentially square or rectangular recesses (10) which have flat side walls (16, 20) with a horizontally circumferential bend (14) in the upper half thereof, the bend (14) in the recess (10) divides an upper straight truncated pyramid (18) with flatter side walls (16) and a lower straight truncated pyramid (22) with steeper side walls (20) which clearly differ from the vertical, and

- Reinforcement sticks (24) formed at least over the area of the four side edges of the upper truncated pyramid (18) and the corners of the bend (14), which begin in the edge (12) and in the flat area of the four side edges (26) of the lower truncated pyramid ( 22) leak.

2. Support film according to claim 1, characterized in that the cross section of the reinforcing beads (24) narrows downward and is preferably trapezoidal or semicircular.

3. Support film according to claim 1 or 2, characterized gekennzeich¬ net that the reinforcing beads (24) tangentially into the flat area of the side edges (26) of the lower truncated pyramid (22) and preferably have a deeper cross-section below.

4. Support film according to one of claims 1-3, characterized ge indicates that the width and depth of the cross section of the reinforcing beads (24) are 5-20 mm, preferably 10-15 mm.

5. Support film according to one of claims 1-4, characterized ge indicates that it is 0.3 - 1 mm thick and the horizontal side length of the recesses (10) at the top 5 - 25 cm and the bottom 1 - 5 cm amount.

6. Support film according to one of claims 1-5, characterized ge indicates that the inclination angle (e_ ^) of the side surfaces (16) of the upper truncated pyramid (18) with respect to the horizontal at 10 - 60 ° , preferably 15-30 ", and the angle (s) of inclination (β) of the side surfaces (20) of the lower truncated pyramid (22) are 30-80", preferably 60-75 ".

7. Support film according to one of claims 1-6, characterized ge indicates that it is made of a thermoplastic, preferably polyvinyl chloride, polyethylene, polypropylene or polystyrene, or a ti efzi-capable metal, preferably aluminum or an AI umin iuml e- greed, exists.

8. Support film according to one of claims 1-7, characterized in that an insulating molded part or bulk material is introduced into the lowermost region of the depression (10).

Supporting film according to one of claims 1 to 8, characterized in that it is designed as a film web or plate and has means for connection to another film or plate in the joint or overlap area, preferably one inside the other! adjustable longitudinal grooves or stock exchange! inungen.

10. Use of the support film according to any one of claims 1-9 as a formwork for the production of in-situ curing top floors.