| 摘要 |
<p>The present invention relates to a long-span slab system which inhibits a generation of cracks on an upper slab concrete on a bonding part between a PC beam and a PC slab, and prevents a leakage of an on-site poured concrete through the bonding part. According to the present invention, the long-span slab system comprises: a PC beam installed in an upper end of a column; one or more PC slabs held on one side of an upper surface of the PC beam; and on-site poured concrete poured above the PC beam and the PC slab. The PC beam is composed of a lower base part; and a protrusion part protruding above the base part to form step parts on both sides of the upper surface of the base part due to a width narrower than the width of the base part, forms a shape of an inverted′T′. The PC slab is composed of an upper plate; and a plurality of ribs arranged at regular intervals in a direction perpendicular to the PC slab and below the upper plate. The ribs are held on the upper surfaces of the step parts of the PC beam. The upper plate has both end parts protruding longer than the ribs, and the protruding end parts are held on the upper surface of the protrusion part of the PC beam to block a space between the ribs of the PC slab and the protrusion part of the PC beam. A first anchoring steel bar, which is buried in on-site poured concrete for anchorage, protrudes from the end part of the PC slab in a longitudinal direction; the lower part of the first anchoring steel bar is placed inside the ribs; and the upper part of the first anchoring steel bar anchors aslant inside the PC slab to protrude towards an end part of the upper plate such that the ribs and the PC beam can be integrated with each other.</p> |
