Construction construction method of basement and molding box null for basement construction

摘要

PURPOSE:To construct a basement with excellent execution efficiency and high water-proofing performance by forming water-proofing sheet form bodies provided with reinforcing rigid forms to the outsides of the water-proofing sheet forms in an underground space, erecting internal forms to the inside, and forming a floor section and wall sections. CONSTITUTION:A water-proofing sheet is spread and provided through a floor frame and wall frame, and water-proofing sheet permanent forms 2 are formed in the shape of a box. After that, reinforcing rigid forms 3 are provided to the outsides of the permanent forms 2 so that they are capable of removing, water-proofing sheet form bodies 4 are formed and, at the same time, internal forms 5 corresponding to a wall thickness (W) are erected to the insides of the form bodies 4 to form basement construction forms. Then, an area surrounded by sheet piles 1 is excavated to form an underground space, and the basement construction forms are placed. Concrete is placed respectively between the water-proofing sheet form bodies 4 and internal forms, and a floor section U2 and wall sections U1 holding together with the water-proofing sheet permanent form bodies 2 as a unit are formed. According to the constitution, water-proofing layers with high reliability are formed to the wall sections and floor section, a construction period can be reduced and, at the same time, a construction cost can be reduced.