The present invention can be advantageously used in lightweight two-way slabs and hollow, and the biaxial hollow slab construction that the hollow donut-formed body, and to a preferred construction method of a biaxial hollow slab. ; toroidal hollow body formed in accordance with the present invention, the hollow portion is formed on the central body of circular cross-section in the three-dimensional Surfaces and edges are treated as a whole is characterized by having an outer covering of the donut shape. ; 2 directions hollow slab, multiple column above the sparsely arranged in a donut-shaped hollow that is performed in accordance with the present invention formed body; The donut-shaped hollow body formed under the slab bottom reinforcement that reinforcement; The donut-shaped hollow body forming the upper slab reinforcement being reinforced over; The upper and lower slab reinforced slab being poured concrete curing a thickness of purchase; doedoe comprise the donut-shaped hollow body is formed inside the rebar cage or redemption being provided so as to form bonds reinforced hollow body spacer on the bottom slab, reinforced along the horizontal direction and vertical direction are arranged in a matrix form between and being embedded in the concrete slab.
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