Corrugated steel decking section

Claim 2

In a steel floor decking section comprising a profiled steel sheet having plural crest surfaces in a common crest plane, plural valley surfaces in a common valley plane and sloping web surfaces connecting each said crest surface to the adjoining valley surface, whereby each said crest surface and its contiguous sloping web surfaces form a raised flute, the said crest surfaces being a width greater than the spacing between the said crest plane and the said valley plane; lateral connecting means disposed along each of the outer ones of said valley surfaces of said decking section; the improvement comprising a lengthwise groove which is uninterrupted for the length of the decking section and enters beneath the said crest surface in each of the said sloping web surfaces adjacent the top of said raised flute, wherein a flat plane which includes the said sloping surface intersects the said crest plane at or outside the adjacent side edge of the crest.

Claim 3

The steel decking section of claim 1 wherein said groove has a depth of 5 to 15 mm.

Claim 4

The decking section of claim 1 wherein the distance between the inner surfaces of the two said grooves of each said raised flute are spaced apart by a distance which is less than the width of the included crest surface.

Claim 5

The steel decking section of claim 1 wherein each of said valley surfaces has an upstanding bead extending along the length of the decking section.

Claim 6

The steel decking section of claim 1 wherein each said crest surface has a longitudinal stiffening bead extending into the said raised flute.

Claim 7

The decking section of claim 1 wherein the said sloping web surfaces are essentially flat surfaces between the said groove and the contiguous valley surface and wherein plural metal deformations in the form of indentations or embossments are provided over the flat portion of said web surfaces.

Claim 8

In a steel floor decking section comprising a profiled steel sheet having plural crest surfaces in a common crest plane, plural valley surfaces in a common valley plane and sloping web surfaces connecting each said crest surfaces to the adjoining valley surface, whereby each said crest surface and its contiguous sloping web surfaces form a raised flute, the said crest surfaces having a width greater than the spacing between the said crest plane and the said valley plane; lateral connecting means disposed along each of the outer ones of said valley surfaces of said decking section; the improvement comprising a lengthwise groove which is uninterrupted for the length of the decking section in each of the said sloping web surfaces adjacent the top of said raised flute, the said groove being inwardly disposed beneath the said crest surface such that a plane normal to the said crest surface at the edge of said crest surface will intersect the said groove and will not intersect the said sloping wall surface.

Claim 9

In a steel floor decking section comprising a profiled steel sheet having plural crest surfaces in a common crest plane, plural valley surfaces in a common valley plane and sloping web surfaces connecting each said crest surfaces to the adjoining valley surface, whereby each said crest surface and its contiguous sloping web surfaces form a raised flute, the said crest surfaces having a width greater than the spacing between the said crest plane and the said valley plane; lateral connecting means disposed along each of the outer ones of said valley surfaces of said decking section; the improvement comprising a lengthwise groove which is uninterrupted for the length of the decking section in each of the said sloping web surfaces adjacent the top of said raised flute, the said groove being inwardly disposed beneath the said crest surface such that a plane normal to the said crest surface at the edge of said crest surface will intersect the said groove and will not intersect the said sloping wall surface.

Claim 10

The decking section of claim 1 wherein the said groove comprises a first downwardly curved surface at the side of each said crest, connecting with an inwardly, downwardly sloping flat surface, a second outwardly curved surface, an outwardly directed flat surface and a downwardly curved surface which joins the adjacent said sloping sidewall surface.