PC SLAB WITH SPIRAL TYPE SHEAR REINFORCEMENT DEVICE

摘要

PURPOSE: A PC(Prestressed Concrete) slab with an earthquake-proof shear reinforcing unit is provided to improve the resistance capacity to an earthquake load in a longitudinal direction of a support rib during an earthquake and improve workability. CONSTITUTION: A plurality of support ribs(20) is arranged on one surface side of a long span panel(10) at equidistant intervals, and a spiral shear reinforcing unit(100) is embedded into the support ribs. The spiral shear reinforcing unit comprises a spiral bar(110), an upper bar(120), a lower bar(130), and a plurality of support legs(140). The upper bar is arranged to an upper part of one surface side of the spiral bar along a longitudinal direction of the spiral bar. The lower bar is arranged to a lower part of the other surface side of the spiral bar along the longitudinal direction of the spiral bar. The support legs are connected to a lower one side and the other side of the spiral bar. [Reference numerals] (AA) Binding force of concrete increases relative to a spiral bar;