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本物品は、掘削孔の全長にわたり回転圧入しながら地盤を切削するためのケーシングチューブである。本物品にはその外周面に沿って螺旋状に突起が設けられており、本物品を使用して地盤を切削すると、掘削孔の孔壁に上記突起の形状に対応する螺旋状の溝を設けることができる。The article is a casing tube for cutting the ground while rotating and press-fitting the entire length of a borehole. This article has a spiral projection along its outer peripheral surface, and when the ground is cut using this article, a spiral groove corresponding to the shape of the projection is formed on the hole wall of the excavation hole. be able to.