CONNECTION STRUCTURE OF TUNNEL SUPPORT AND CONSTRUCTION METHOD OF TUNNEL SUPPORT

To provide a connection structure of a tunnel support and a construction method of the tunnel support that make it possible to connect a pair of split supports easily, efficiently, and with high accuracy.SOLUTION: In a connection structure 100 of a tunnel support, a first joint plate 15 and a second joint plate 25 of a first split support 10 and a second split support 20 having an arc-shape are connected. A through hole 27 is opened in the second joint plate 25, and a male member 30 inserted into the through hole 27 is projected in the first joint plate 15. The male member 30 is provided with an accommodating groove 34. The accommodating groove 34 is communicated with a side surface opening 35. A pair of claws 40 is arranged so as to be freely moved in and out of the accommodating groove 34 through the side surface opening 35 in the accommodating groove 34. An end portion of a base portion side of the pair of claws 40 is urged by an elastic material 50 and overhangs outward through the side surface opening 35. The male member 30 is inserted into the through hole 27 and wide width surfaces of the first joint plate 15 and the second joint plate 25 abut with each other, and the end portion of the pair of the claws 40 engages or faces the wide width surface 26 of the second joint plate 25.SELECTED DRAWING: Figure 8 【課題】一対の分割支保工の連結を、簡易、効率的かつ高精度に行うことを可能とする、トンネル支保工の連結構造とトンネル支保工の施工方法を提供する。【解決手段】円弧状の第一分割支保工１０と第二分割支保工２０の第一継手板１５と第二継手板２５が連結されたトンネル支保工の連結構造１００であり、第二継手板２５には貫通孔２７が開設され、第一継手板１５には貫通孔２７に挿通される雄部材３０が突設し、雄部材３０は収容溝３４を備え、収容溝３４は側面開口３５に連通し、収容溝３４には一対の爪４０が側面開口３５を介して収容溝３４の内外に出入り自在に配設され、一対の爪４０の基部側の端部が弾性材５０によって付勢されて側面開口３５を介して外側に張り出し、雄部材３０が貫通孔２７に挿通され、第一継手板１５と第二継手板２５の広幅面同士が当接し、一対の爪４０の前記端部が第二継手板２５の広幅面２６に係合もしくは対向している。【選択図】図８