TH59526A - Creating roof ceilings from indirect compression concrete - Google Patents

Abstract

DC60 (21/04/46) Indirectly prestressed concrete ceiling structures are pre-formed components for the construction of large span industrial buildings. The structure consists of an extra-thin, wide concrete slab (1) and a thin-walled, inverted V-shaped superstructure (2) connected by tapered steel rods (3) which are used to stabilize the superstructure (2) against lateral buckling and to prevent sections (1) and (2) from moving toward or apart. Prestressing the slab (1) creates compression in the superstructure (2), which indirectly pushes the ends of the structure, eccentricating the center of gravity of the cross-section, causing the ends to rotate in a way that causes the slab to twist upward. There are two efficient methods for prestressing these structures. Indirectly prestressed concrete ceiling structures are pre-formed components for the construction of large span industrial buildings. The structure consists of an extra-thin, wide concrete slab (1) and a thin-walled, inverted V-shaped superstructure (2) connected by... The tapered steel bar (3) is used to stabilize the upper beam (2) against lateral deflection and to prevent sections (1) and (2) from moving towards or away from each other. The prestressing of the ceiling panel (1) creates compression in the upper beam (2), which indirectly pushes against the ends of the structure, acting eccentrically on the center of gravity of the cross-section, causing the ends to rotate in a way that causes the ceiling panel to twist upwards. There are two effective methods for prestressing these structures.

Claims (3)

What I am claiming as my right is: 1. Indirectly prestressed concrete ceiling structure with flat ceiling panels, a pre-formed building component for the construction of large span industrial buildings. The structure consists of extra-thin, wide concrete panels (1) and thin-walled V-shaped upper beams (2), which are connected by widely spaced tapered steel tubes (3). The ceiling panels are prestressed through the center. 2. The principle of prestressing of the ceiling structure claimed in claim 1 is such that the control of the deflection of the ceiling panel (1) is achieved by indirect prestressing, whereby the prestressing of the ceiling panel (1) causes a passive reaction force of the upper beam (2) to both ends (4), causing twisting in such a way that the ceiling panel (1) twists upward by rotating at the ends of the beam. 3. The principle of stability of the ceiling structure claimed in claim 1 is such that the upper beam (2) is protected from lateral deflection by the use of tapered steel bars (3) placed at an angle, spaced apart along the slope of the inverted V-face of the upper beam (2), where the thin wall shortens the effective length of the bars (3).