VERTICAL SHAFT CONSTRUCTION METHOD

PROBLEM TO BE SOLVED: To provide a vertical shaft construction method capable of constructing a structure constituting a vertical shaft while securing quality as designed.SOLUTION: A vertical shaft construction method includes: a first step S1 for constructing a soil-stopping wall from the ground; a second step S2 for performing underwater excavation of a region in the soil-stopping wall while maintaining a water level in the soil-stopping wall; a third process S3 for floating a steel shell body on the water surface inside the soil-stopping wall; a fourth step S4 for forming the body side wall of a vertical shaft body wall while adding a body side wall part in an atmosphere above the water surface; a fifth step S5 for filling the space between a bottom slab and a vertical shaft bottom surface and filling the space between the inner peripheral surface of the soil-stopping wall and the outer peripheral surface of the vertical shaft body wall; and a sixth step S6 for connecting end parts on the ground of the soil-stopping wall and the body side wall. 【課題】設計どおりの品質を確保しつつ、立坑を構成する構造物を構築することが可能な立坑構築方法を提供する。【解決手段】立坑構築方法は、土留壁を地上から構築する第１の工程Ｓ１と、土留壁内の水位を維持しながら土留壁内の領域を水中掘削する第２の工程Ｓ２と、鋼殻体を土留壁の内側における水面に浮かべる第３の工程Ｓ３と、立坑本体壁の本体側壁を、水面上方の大気中において本体側壁部を継ぎ足しつつ形成する第４の工程Ｓ４と、底版と立坑底面との間を間詰充填すると共に、土留壁の内周面と立坑本体壁の外周面との間を間詰充填する第５の工程Ｓ５と、土留壁及び本体側壁の地上における端部同士を連結する第６の工程Ｓ６と、を備える。【選択図】図２