| 摘要 |
1. The double prestressed, composite, roof-ceiling construction with flat-soffit construction for constructing industrial large-span buildings characterized in that comprises distincted wide and thin, finished concrete plate (1) and two-part upper steel construction (2), sloped or arch shaped, connected to soffit-plate (1) by vertical elements (3), that is prestressed centric, by adhesion prestressing on mould (6) whereby the upper steel construction (2) is prestressed by pushing-apart with the wedge (7) in the middle span and separated steel parts are then connected. 2. The prestressed, composite, roof-ceiling construction with flat soffit as claimed in claim 1 characterized in that the connection between concrete plate (1) and the steel construction is realised by incorporated to concrete vertical elements (3) whereby through holes (5) at bottom ends of vertical elements (3) tendons (4) were conducted serving the same time to hold reinforcing welded meshes at the mould-distance during concreting. 3. The prestressed, composite, roof-ceiling construction with flat soffit as claimed in claim 1, characterized in that is prestressed by two independent methods whereby the deflection of the concrete soffit plate (1) is controlled by prestressing the upper beam (2) and the wide of cracks in concrete soffit-plate (1) is controlled by the centrical prestressing. 4. The prestressed, composite, roof-ceiling construction with flat soffit as claimed in claim 1, characterized in that the upper beam (2) is prevented against buckling by lateral elements (9) being anchored in concrete of the soffit-plate (1). 5. The prestressed, composite, roof-ceiling construction with flat soffit as claimed in claim 1, characterized in that the prestressing force (Po) that is introduced to the construction by pushing-apart, according to Fig. 2, acts over the gravity center of the over all cross-section (T) of the composite construction at the eccentricity (e).
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