FLOOR SLAB Russian patent published in 1997 - IPC

FIELD: floor slab for construction of multistory prefab panel buildings. SUBSTANCE: slab is made of thermally treated concrete mix and endless string-type reinforcement which is wound in dual-axis and dual-row direction. Panel has ribs at three sides which are located in part of cross- sectional height of panel in middle part of its sides. Panel has also vertical slots in ribs and along its forth side. It is provided with internal rectangular anchors with supporting flats and external and internal bifurcated vertical protrusions with holes which are seated in slots of slab. String armature is wound with tension around internal anchors. Upper internal anchors are connected by means of tie-rods and pins with lower internal anchors. External protrusions of anchors are made as load-lifting loops. Tension force applied to each reinforcement string is equal to 0.7 of its ultimate strength value. EFFECT: high efficiency. 4 cl, 6 dwg