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AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsYoshio Tani, Susumu Takata, Kazuo Kamei
Estimating the term…
A concrete reinforcing steel fiber has an alternate arrangement of basic portions corresponding to the body of the steel fiber material, and section-shaped portions formed by pressing the steel fiber material between a grooved forming roller and a toothed forming roller. Each section-shaped portion has a flat upper surface, lateral projections and a round bottom. The pressure bearing area b of the section-shaped portion, namely, the sum of the cross-sectional area of the lateral projections and the area of the end surface of the basic portion contiguous with the section-shaped portion, is in the range of 0.2A to 0.5A (A=cross-sectional area of the basic portion). The total pressure bearing area B of the steel fiber is in the range of 3A and 8A, and also in the range of 0.02T and 0.08T (T=tensile strength of the steel fiber).
A concrete reinforcing steel fiber having excellent tensile strength, T, and adhesion to concrete, which comprises alternately arranged basic portions, each basic portion providing a pressure bearing area and each section-shaped portion providing three pressure bearing projection areas, each of said portions satisfying the inequality:
A concrete reinforcing steel fiber having excellent tensile strength and adhesion to concrete, which comprises alternately arranged basic portions and section-shaped portions, each basic portion providing a pressure bearing area and each section-shaped portion providing three pressure bearing projection areas, and wherein said basic portions and said section-shaped portions have a projection area ratio in the range of 20-50%, said ratio being the ratio of a cross-sectional area of the projections of a section-shaped portion to a cross-sectional area of a basic portion.
A concrete reinforcing steel fiber having excellent tensile strength and adhesion to concrete, which comprises alternatively arranged basic portions and section-shaped portions, each basic portion providing a pressure bearing area and each section-shaped portion providing two pressure bearing areas;
Dependencies are inferred from the claim text.