FLOOR

Abstract: Floor in a building comprising joists and between them slabs. According to the invention the joists are composed of a web (11) and two flanges (12, 13), the web having a lattice structure, and the slabs (20) consisting of a cast, light material and having their top surface lower than the top surface of the joists (11).

Description: Floor The present invention relates to a floor comprising joists carrying between them slabs. Such floors have usually a high weight which requires strong dimensioning and renders it difficult to make channels for wiring, tubing, ventilation and heating. The invention is an improvement in this regard in that the joists have a lattice shaped web, for instance a rod bent to zigzag shape, and two flanges. Furthermore the slabs are made of a light material, for instance cellular plastic as polyurethane, and have a lower height than the joists and are placed at the lower portion of the joists so that a free space is formed at the upper part of the joists. The invention is closer described in the following specifi¬ cation with drawings showing the following. Fig. 1 , a perspective view of a floor according to the in- vention. Fig. 2, a section of the floor in Fig. 1 along the joists. Fig. 3 > a section of the floor in Fig. 1 perpendicularly to the joists. The joists 10 are composed of a web 11 having the form of a lattice formed by a metal rod or similar bent to zigzag shape and two wood langes, one upper 12 and one lower flange 13. he web is fastened to the flanges, suitably by counter¬ sinking into recesses in the flanges and fastening them there by glueing or some similar method. As a glue can suitably be used a hardening glue, for instance polyurethane or some other glueing plastic, or epoxy glue. The invention can, however, also be used for similar joists having a mechanical fastening of the- web in the flanges by means of nails, bolts or other fastening means. At the lower part of the joists there are attached by cas¬ ting or in some other way slabs 20 which have a lower height than the joists and s iitably have their lower side level with the lower side of the. joists. he upper side of the 1 slabs will in this way lie below the upper flange of the joists, for instance at half the height of the joist. The OMPI /.. WIPO _Λ slabs 20 shall be made of a light material, suitably cel ¬ lular plastic as polyurethane, which adheres to the joists with a glueing effect, and shall be self-supporting and suitably also be strong enough to carry the assemblers during the erection stage. On the bottom side of the slabs a panel 21 can be added which also can be made adhering to the slab by the glueing effect mentioned. The slabs 20 can suitably be cast in contact with the joists 10 for instance by pre abricating units on the ground^ each unit comprising one or more joists with attach slabs 20. These units are then lifted to their place in the building and the floors can be giventhe desired size by mounting a number of units side by side. Alternatively it is of course possible first to mount the joists 10 in their final place in the building and then cast the slabs 20 in their final place. The described structure has a low weight. The position of the slab 20 at the lower part of the joists 10 leaves a space 23 above the slab 20 up to the floor panel 22 which is attached to the upper flange 12 of the joists. This spac 23 is open not only along the joists but also transversely through the openings in the lattice structure of the webs 11. The floor can thus be used for installation of wiring and piping for water and drain in all directions along the floor. It is also possible to use the floor for circulation of air in all directions, with or without ducts, for coo¬ ling or heating or fresh air supply. The use of wood flanges according to the described embodi¬ ment has the advantage that the floor boards can be nailed directly to the flanges. Alternatively metal flanges can be used, for instance of aluminium, steel or other suitable metals . A specific advantage of the described structure, besides the already mentioned, is the low weight of the structure i n combination with a great stiffness, properties which facilitate the lifting and assembly of prefabricated units. OMPI

Claims: Claims 1. Floor comprising joists and between them slabs, charac¬ terized in that the joists (10) have a web (11) and two flanges (12,13) ι the web (11) having a lattice structure and the slabs (20) consisting of a cast, light material and having their top surface lower than the top surface of the joists (11 ) . 2. Floor as defined in claim 1 , characterized in that the bottom side of the slabs (20) is substantially level with the ' bottom side of the joists. 3. Floor as defined in any of the preceding claims, charac¬ terized in that the web is a metal rod bent to zigzag form. h . Floor as defined in claim 3, characterized in that the flanges (12,13) are of wood and have recesses in which the ' < bent portions of the web are inserted. 5. Floor as defined in claim 3 or , characterized in that the bent portions of the web (11) are attached to the flanges (12,13) " by glueing. 6. Floor as defined in claim 5. characterized in that the glue is polyurethane. 7. Floor as defined in any of the preceding claims, charac¬ terized in that the slabs (20) are made of cellular plastic as polyurethane. 8. Floor as defined in any of the preceding claims, charac¬ terized in that the floor is assembled from prefabricated units, each consisting of one or more joists (10) and ad¬ joining slabs (20). 9. Floor as defined in any of the preceding claims, charac¬ terized in that the slabs are made of a material that ad¬ heres with a glueing effect to the joists.

Inventors: ERICSSON A
Applicants: ERICSSON A, FRELENA AB
Application year: 1980
Main classification: E04B5
IPC codes: E04B5, E04B7, E04C2, E04C5