Floor construction suitable for installation in rooms containing switchgear, computers, and like electrical apparatus, and a method for producing such a floor construction

A floor construction, suitable for rooms containing electrical equipment comprising a plurality of mutually parallel, elongated, longitudinally extending first joists and a plurality of mutually parallel, elongated second joists which are located transversely, at right angles to the first joists, said first and second joiats defining one or more square and/or rectangular cavities, said cavities being covered by one or more right-angled slabs which form the floor surface and which are arranged and dimensioned to be supported along their edge portions by upper surfaces of respective edge portions of adjacent first and second joist sections, the plurality of first joists provided with a plurality of first recesses spaced at a predetermined distance apart along said first joists;

• the second joists provided with a plurality of second recesses spaced at a predetermined distance apart along said second joists;
• said first and second joists each provided with third recesses forming channels for pipes, electrical cables and the like, said first and third recesses reducing flexural resistance of said first joists, so that said first joists are adapted to rest conformingly against a support foundation, the second and third recesses reducing the flexural resistance of the second joists so that said second joists are adapted to rest against the first joists or the supporting foundation in a manner to cause a first recess in one of the first joists to co-act with a second recess of one of the second joists in a manner to locate the upper surface of a first joist and the upper surface of a second joist in a common plane;
• at least one slab provided with means for locking the slab against horizontal movement in a plane relating to the upper surfaces of the joists, said locking means on said slab also being arranged to lock first and second joists in a right angled position and in mutually parallel positions;
• the joists having the form of right-angled, sheet-metal sections of U-shaped cross-section, at least one of said first and second recesses each formed by two mutually opposing pairs of slots;
• the joists being provided with additional slots for receiving stiffening plates or the like, said plates extending above the upper surface of respective joists to form a structural part for co-action with said locking means.

A floor construction, suitable for rooms containing electrical equipment comprising a plurality of mutually parallel, elongated, longitudinally extending first joists and a plurality of mutually parallel, elongated second joists which are locked transversely, at right angles to the first joists, said first and second joists defining one or more square and/or rectangular cavities, said cavities being covered by one or more right-angled slabs which form the floor surface and which are arranged and dimensioned to be supported along their edge portions by upper surfaces of respective edge portions of adjacent first and second joist sections, the plurality of first joists provided with a plurality of first recesses spaced at a predetermined distance apart along said first joists;

• the second joists provided with a plurality of second recesses spaced at a predetermined distance apart along said second joists;
• said first and second joists each provided with third recesses forming channels for pipes, electrical cables and the like said first and third recesses reducing flexural resistance of said first joists, so that said first joists are adapted to rest conformingly against a support foundation, the second and third recesses reducing the flexural resistance of the second joists so that said second joists are adapted to rest against the first joists or the supporting foundation in a manner to cause a first recess in one of the first joists to co-act with a second recess of one of the second joists in a manner to locate the upper surface of a first joist and the upper surface of a second joist in a common plane;
• at least one slab provided with means for locking the slab against horizontal movement in a plane relating to the upper surfaces of the joists, said locking means on said slab also being arranged to lock first and second joists in a right angled position and in mutually parallel positions;
• the upper surfaces of the joists being provided with mutually parallel slots adapted to receive an insert plate which is dimensioned to extend above the upper surface of a respective joist for co-action with a groove formed in an under surface of the slab.