ROOF CONSTRUCTION METHOD

PURPOSE:To reduce the cost for erection structures at the time the roof of an underground tank or the like is constructed, and also to shorten the construction period. CONSTITUTION:A cylindrical continuous pile 11 having air-permeability resistance are embedded in the ground G, and on the ground G on the inner circumferential side of this continuous pile 11, a ring dome 5 is constructed along the circumferential direction of the upper end of the continuous pile 11 so as to be air-tightly connected. A formwork 13 is supported by erection materials 12 in a dome shape so as to cover the upper part of the continuous pile 11. Air is filled by a blower 15 into the space K that has been formed by the formwork 13 on the ground G on the inner circumferential side of the continuous pile 11, and that has been airtightly closed by the formwork 13, the continuous pile 11, and the ground water S1 in the ground G on the inner circumferential side of the continuous pile 11, and a dome roof 4 is constructed by placing concrete on the outside of the formwork 13.