CONSTRUCTION METHOD OF FLOOR SLAB AND JOINT STRUCTURE OF PCa FLOOR SLAB

PROBLEM TO BE SOLVED: To provide a construction method of a floor slab and a joint structure of a PCa floor slab capable of reducing arranging-binding work at a job site of a reinforcement bar arranged between an upper joint reinforcement and a lower joint reinforcement.SOLUTION: An upper reinforcement bar 25 is bound in at least one of upper joint reinforcements 21U and 22U (Fig.6), and a lower reinforcement bar 26 is bound in at least one of lower joint reinforcements 21L and 22L. A first PCa floor slab 8A is precedently arranged in a predetermined first position P1 (Fig.7(A)), and a second PCa floor slab 8B is suspended later up to a predetermined height at which the second lower joint reinforcement 22L of the second PCa floor slab 8B becomes lower than the first upper joint reinforcement 21U of the first PCa floor slab 8A in a position separated from the first PCa floor slab 8A in a plan view more than a predetermined second position P2 (Fig.7(B)), and the second PCa floor slab 8B is laterally moved to the first PCa floor slab 8a-side in a predetermined height, and is arranged in a second position (Fig.7(C)-(D)). Afterwards, joint concrete 13 is placed in a clearance G.SELECTED DRAWING: Figure 7 【課題】上部継手鉄筋と下部継手鉄筋との間に配置される補強鉄筋の現場での配置、結束作業を減らすことができる床版の構築方法、及びＰＣａ床版の継手構造を提供する。【解決手段】上継手鉄筋２１Ｕ、２２Ｕの少なくとも一方に上補強鉄筋２５を結束し（図６）、下継手鉄筋２１Ｌ、２２Ｌの少なくとも一方に下補強鉄筋２６を結束しておく。先行して第１ＰＣａ床版８Ａを所定の第１位置Ｐ１に配置し（図７（Ａ））、後から第２ＰＣａ床版８Ｂを、所定の第２位置Ｐ２よりも平面視で第１ＰＣａ床版８Ａから離れた位置で、第２ＰＣａ床版８Ｂの第２下継手鉄筋２２Ｌが第１ＰＣａ床版８Ａの第１上継手鉄筋２１Ｕよりも低くなる所定高さまで吊り下ろし（図７（Ｂ））、第２ＰＣａ床版８Ｂを所定高さで第１ＰＣａ床版８Ａ側へ横移動させ、第２位置に配置する（図７（Ｃ）〜（Ｄ））。その後、隙間Ｇに継手コンクリート１３を打設する（図７（Ｅ））。【選択図】図７