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Title:
DEVICE FOR A BUILDING FOUNDATION
Document Type and Number:
WIPO Patent Application WO/2008/118059
Kind Code:
A1
Abstract:
The present invention relates to a device for a building foundation, which building foundation comprises a concrete slab (1) with an edge portion (3) which is of greater depth than the rest of the concrete slab and provided with sheetlike insulation (10, 11) on its outside. Distinguishing features of the device according to the present invention are that a profiled element (15; 115) is cast into the edge portion (3), that an outer portion of the profiled element (15; 115) is accommodated in the insulation (10, 11) and that at least part of the outer portion of the profiled element (15; 115) is situated at the same level as the upper edge of the sheetlike insulation (10, 11).

Inventors:
WALLIN, Magnus (Bävervägen 66, Sollentuna, S-191 31, SE)
PERSSON, Stefan (Backhammervägen 4, Lidköping, S-531 55, SE)
Application Number:
SE2008/000222
Publication Date:
October 02, 2008
Filing Date:
March 26, 2008
Export Citation:
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Assignee:
THERMISOL AB (Braxenvägen 8, Norrtälje, S-761 41, SE)
SPIKMA BETONG AB (Kinne.Vedum, Götene, s-533 97, SE)
WALLIN, Magnus (Bävervägen 66, Sollentuna, S-191 31, SE)
PERSSON, Stefan (Backhammervägen 4, Lidköping, S-531 55, SE)
International Classes:
E02D27/01
Foreign References:
SE437536B
SE507845C2
SE505361C2
SE513152C2
SE529500C2
Attorney, Agent or Firm:
ERIKSSON, Kjell (Norrtelje Patentbyrå AB, P.O. Box 38, Norrtälje, S-761 21, SE)
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Claims:
Claims

1. A device for a building foundation, which building foundation comprises a concrete slab (1) with an edge portion (3) which is of greater depth than the rest of the concrete slab and provided with sheetlike insulation (10, 11) on its outside, c h a r a c t e r i z e d in that a profiled element (15; 115) is cast into the edge portion (3), that an outer portion of the profiled element (15; 115) is accommodated in the insulation (10, 11) and that at least part of the outer portion of the profiled element (15; 115) is situated at the same level as the upper edge of the sheetlike insulation (10, 11) .

2. A device according to claim 1, c h a r a c t e r i z e d in that reinforcing bars (18) are connected to the portion of the profiled element (15) which is situated in the edge portion (3) .

3. A device according to claim 2, c h a r a c t e r i z e d in that the reinforcing bars (18) are C-shaped.

4. A device according to claim 2 or 3, c h a r a c t e r i z e d in that the reinforcing bars (18) are welded to the profiled element (15) .

5. A device according to any one of the above claims, c h a r a c t e r i z e d in that the profiled element (15) is of T-shaped cross-section.

6. A device according to claim 5, c h a r a c t e r i z e d in that reinforcing bars (18) are connected to a web (16) of the profiled element (15) .

7. A device according to any one of the above claims, c h a r a c t e r i z e d in that the profiled element is of U- shaped cross-section.

8. A device according to claim 1 or 2, c h a r a c t e r i z e d in that the profiled element (115) is of rectangular cross-section.

9. A device according to any one of the above claims, c h a r a c t e r i z e d in that the profiled element (15) comprises a plate (19), the width (B2) of which is greater than the width (Bl) of the profiled element (15) in the region of the upper edge of the sheetlike insulation (10, 11) .

10. A device according to claim 9, c h a r a c t e r i z e d in that the profiled element (15) is of T-shaped cross-section and that the plate (19) is connected to a flange (17) of the profiled element (15) .

Description:

DEVICE FOR A BUILDING FOUNDATION

Technical field of the invention

The present invention relates to a device for a building foundation, which building foundation comprises a concrete slab with an edge portion which is of greater depth than the rest of the concrete slab, which edge portion has sheetlike insulation disposed on its outside.

State of the art

SE-C-507 845 discloses a device for use in a building foundation of the "slab on ground" type. The device comprises an insulating element made of cellular plastic and defining the outer edge portion of the device. The insulating element comprises a first recess which is open upwards and extends in the longitudinal direction of the insulating element, the insulating element having a generally U-shaped cross-section. The insulating element also comprises other recesses situated in one of the legs of the U, which other recesses are disposed at certain centre-to-centre spacing in the longitudinal direction of the insulating element. A reinforcing beam made of concrete is inserted in the first recess and is connected to the concrete slab situated inside the insulating element. This connection is effected by crossbeams made of concrete, which are situated in the other recesses and extend between the reinforcing beam and the bottom slab. In the region of its upper edge, the reinforcing beam is of increasing width, making it possible, for example, for a brick facade to be supported by the reinforcing beam. SE-C-505 361 discloses a device for use in edge elements for base slabs. A concrete plinth is cast between two vertical insulating elements made of cellular plastic. A base slab cast within is also part of the device. The inner vertical insulating element is provided at the bottom with holes which are filled with concrete during the casting, catering for the transmission of loads from the concrete plinth to the base slab.

SE-C-513 152 discloses a loadbearing edge beam structure in which the edge beam and the bottom slab are connected

RECORD COPY-TRANSLATION (Rule 12,4)

together by a number of U-shaped reinforcing elements in the form of rods. The reinforcing elements extend obliquely downwards from the bottom slab to the edge beam. The rodlike reinforcing elements pass through an insulating panel made of cellular plastic situated between the edge beam and the bottom slab.

Object and features of the invention

A primary object of the present invention is to propose a device for use in a building foundation, which building foundation comprises a concrete slab with an edge portion which is of greater depth than the rest of the concrete slab, with the intention that the load due to a facade be transmitted downwards into the edge portion of the concrete slab.

Another object of the present invention is that the device should be extremely easy to set up.

A further object of the present invention is that the device should involve the use of components which can be made from standard products.

At least the primary object is achieved by a device provided with the features indicated in the independent claim 1 set out below. Preferred embodiments of the invention are defined in the dependent claims.

Brief description of the drawings

Embodiments of the invention are described below with reference to the attached drawings, in which:

Fig. 1 depicts a vertical section through part of a base slab with a device according to the present invention, and part of a facade supported by the base slab;

Fig. 2 depicts a detail in end-view of a T-section forming part of the present invention, with associated reinforcements ; Fig. 3 depicts a detail in sideview of the T-section forming part of the device, with associated reinforcements; Fig. 4 depicts a detail in plan view of the T-section forming part of the device, with associated reinforcements; and

Fig. 5 depicts a vertical section through part of a base slab with an alternative embodiment of a device according to the present invention, and part of a facade supported by the base slab.

Detailed description of preferred embodiments of the invention The portion depicted in Fig. 1 of a building foundation comprises a concrete slab 1 which has an edge portion 3 which is of greater depth than rest of the concrete slab 1. In the embodiment depicted, the depth of the edge portion 3 is approximately three times the depth of the rest of concrete slab 1. Sheets of insulating material, preferably cellular plastic, are disposed between the concrete slab 1 and the ground. In Fig. 1, the ground takes the form of draining material. In the embodiment depicted, a first insulating sheet 5 is disposed between the edge portion 3 and the ground, and not only the first insulating sheet 5 but also a second insulating sheet 7 and a third insulating sheet 9 are disposed between the rest of the concrete slab 1 and the ground. In the embodiment depicted, each insulating sheet 5, 7, 9 is about 10 cm thick.

A fourth insulating sheet 10 and a fifth insulating sheet 11, likewise preferably made of cellular plastic, are disposed on the outward side of the edge portion 3. According to the embodiment depicted, the fourth insulating sheet 10 is at least 10 cm thick, and the fifth insulating sheet 11 is about 5 cm thick. A thin layer 12 of fibre-reinforced concrete is laid on the outside of the fourth insulating sheet 10. By way of non-limitative example, it is indicated that the fibre-reinforced concrete layer 12 may be 10-15 mm thick, preferably 13 mm.

The continuing description of the device according to the present invention refers also to Figs. 2-4. The device according to the present invention comprises also a profiled element 15 which in the embodiment depicted is a T-section. The T-section 15 is preferably made of stainless steel material, an advantage of which is that is has a relatively low thermal conductivity. In order to place the T-section 15 in the manner depicted in Figs. 1-4, a groove is sawn in the

upper edge of the fourth and fifth insulating sheets 10, 11 to a depth at least corresponding to the depth of the web 16 of the T-section 15. When the T-section 15 is correctly placed, the web 16 is thus accommodated in the groove in the fourth and fifth insulating sheets 10, 11, and the flanges 17 of the T-section 15 abut against the upper edges of the fourth and fifth insulating sheets 10, 11. As illustrated in Figs. 1-4, the length of the T-section 15 exceeds the combined thickness of the fourth and fifth insulating sheets 10, 11, i.e. the T- section 15 has its inner end situated in the edge portion 3.

According to the embodiment depicted, two C-shaped reinforcing bars 18 are welded to their respective sides of the web 16 of the T-section 15. The open end of each C thus faces towards the flange 17 of the T-section 15. The reinforcing bars 18 are situated in the edge portion 3 of the bottom slab 1 when the building foundation according to the present invention is complete.

In the embodiment depicted, the profiled element 15 also comprises a plate 19 which has a width B2, i.e. the extent across the web 16, which exceeds the width Bl of the flange

17. This is illustrated in Fig. 4. The function of the plate 19 is to provide a larger bearing surface relative to the brick facade than the outer part of the flange 17. The plate 19 is permanently connected to the flange 17, preferably by welding.

In constructing the building foundation depicted in Fig. 1, the insulating sheets are set out according to the pattern depicted in Fig. 1. This is followed by the sawing of grooves in the upper edges of the fourth and fifth insulating sheets 10, 11. Further material is removed from the upper edges of the fourth and fifth insulating sheets 10, 11 to allow countersinking of the flanges 17 and the attached plate 19. The spacing between adjoining grooves is at least 60 cm, preferably of the order of 120 cm. The T-sections 15 with attached reinforcing bars 18 are then placed in the grooves in such a way that the flanges 17 and the plate 19 of the T- section 15 will be countersunk in the upper edges of the fourth and fifth insulating sheets 10, 11. As most clearly illustrated in Figs. 2 and 3, the top of the plate 19 is

situated level with the upper edges of the fourth and fifth insulating sheets 10, 11. Thereafter the concrete slab 1 is cast, with the insulating sheets 5, 7, 9, 10, 11 serving as permanent formwork. The portion of the T-section 15 which is situated within the fourth and fifth insulating sheets 10, 11 and the reinforcing bar 18 will thus be cast into the edge portion 3 of the concrete slab. When the concrete has hardened, the T-section 15 constitutes a cantilever beam which can transmit forces to the concrete slab 1. As illustrated in Fig. 1, the outer wall comprises an external brick facade 20 supported by the outer end portion of the cantilever beam/T-section 15, which transmits the load from the brick facade 20 to the edge portion 3 of the concrete slab 1. For the sake of completeness it should be noted that the outer wall depicted in Fig. 1 also comprises sixth and seventh insulating sheets 21 and 22 situated within the brick facade 20, the sixth insulating sheet 21 situated closer to the brick facade 20 being made of cellular plastic, whereas the seventh insulating sheet 22 situated further from the brick facade 20 is made of mineral wool with vertical studs at certain centre- to-centre spacing.

Fig. 5 depicts an alternative embodiment of the device according to the present invention. The configuration of the concrete slab 1 and the insulating sheets 5, 7, 9, 10, 11 in this case is in principle identical to the embodiment according to Fig. 1, so the same reference notations are used for these items as in Fig. 1.

The embodiment according to Fig. 5 differs in principle from the embodiment according to Figs. 1-4 in the configuration of the profiled element 115, which in the embodiment according to Fig. 5 takes the form of a tube, preferably made of stainless material. The cross-sectional shape of the tube 115 may vary and rectangular/quadrilateral shapes may be mentioned by way of non-limitative examples.

Here again a recess is made in the upper edges of the fourth and fifth insulating sheets 10, 11 and is adapted to the cross-sectional dimension of the profiled element 115. As illustrated in Fig. 5, the profiled element 115 slopes in the

section depicted. Thus the left end of the profiled element 115 in Fig. 5 is situated at a higher level than the right end. The end situated at a higher level is thus the outer end of the profiled element 115, which outer end is intended to support the brick facade 20 and to transmit the load from it down into the edge portion 3 of the concrete slab 1.

In this context it should be noted that the profiled element 115 according to Fig. 5 has no supplementary reinforcing bars. The slope of the profiled element 115 means that its inner end is completely anchored in the edge portion 3 of the concrete slab 1.

Conceivable modifications of the invention

In the embodiments described above, the device according to the present invention supports a brick facade 20, but the invention is in no way limited to the external facade taking the form of a brick wall. The invention may with advantage also be used in the case of other types of heavy external facades. In the two embodiments described above, the profiled element 15; 115 has a T-shaped or tubular cross-section. Within the scope of the present invention it is conceivable to use profiled elements with different cross-sections from those indicated above. U-shaped or circular cross-sections may be mentioned by way of non-limitative examples. If a U-shaped cross-section is used, the legs of the U extend downwards from the upward-pointing bottom of the U. Here again the external insulating sheets have to be provided with grooves/recesses to accommodate the legs of the U. In a preferred embodiment, reinforcing bars are welded to the legs of the U in a manner corresponding to the embodiment according to Figs. 1-4 in which reinforcing bars are welded to the web of the T-section.

According to a simplified method for setting up the device according to the present invention, grooves only are sawn, i.e. no further material close to the grooves is removed. When the flanges 17 and the plate 19 are loaded with the weight of the brick facade, there will be a certain penetration of the flanges 17 and the plate 19 into the upper edges of the fourth and fifth insulating sheets 10, 11.




 
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