Concrete structure and method of making it
OwnerCarl-Erik Broms, Kent Arvidssoninventors
Life of this patent
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Abstract
A novel and simple method of making a novel concrete slab structure supported on vertical columns (1) and having high strength against punching shear failure involves: placing stirrup cages (3, 3′) with their open sides downwards directly on top of the bottom reinforcement net (7) in a form; laying, crossed bent bars (8) over the top of the column and running along the bottom reinforcement net (7); laying a top reinforcement net (7′) on top of the stirrup cages (3,3′) and the crossed bent bars (8); pouring concrete into the form to a level above the top reinforcement net (7′).
Claims7
Concrete flat slab structure supported horizontally on at least one substantially vertical column (1), said slab structure having a body of cast concrete with a bottom surface and a top surface opposite thereto, a bottom flexural reinforcement net (7) embedded in said body adjacent the bottom surface, a top flexural reinforcement net (7′) embedded in said body adjacent the top surface, and, in an area immediately surrounding each column, a stirrup cage arrangement (3, 3′) made up of vertically oriented U-shaped bars (4) interconnected in spaced relationship by longitudinally extending horizontal bars (5), as well as two or more bent bars (8) laid substantially at right angles to each other over the column end, each of said bent bars (8) running substantially along said bottom flexural reinforcement net (7) except at the columns where the bent bars run substantially along said top flexural reinforcement net (7′), characterized in that the longitudinally extending horizontal bars (5) of the stirrup cage arrangement (3,3′) are disposed in a non-interlocking manner on top of the bottom flexural reinforcement net (7) and that said top flexural reinforcement net is disposed in a non-interlocking manner on top of the stirrup cage arrangement.
Method of building a concrete slab structure supported horizontally on at least one substantially vertical column (1), said method comprising the following steps of:
- a. laying in a form a bottom flexural reinforcement net (7);
- b. placing, in areas (2) adjacent each column on either side thereof, in parallel rows, long stirrup cages (3,) each composed of a series of vertically oriented U-shaped bars (4) connected, in spaced relationship with each other, by two longitudinally extending bars (5) fixed to the ends of the legs of each U-shaped bar (4);
- c. laying, at right angles to each other and crossing each other at the respective column, at least two bent bars (8), in such a way that each of said bars runs substantially along said bottom flexural reinforcement (7) except at the columns (1);
- d. laying, on top of said stirrup cages and said bent bars, a top flexural reinforcement net (7′);
- e. pouring concrete in said form to a level above said top flexural reinforcement net (7′) and allowing it to set.
Dependencies are inferred from the claim text.