METHOD OF PRODUCTION OF LARGE TANK, SYSTEM USING SUCH LARGE TANK AND SUBMERGED TUNNELING METHOD USING THE TANK

摘要

A large tank production method which makes it possible to producea large tank which cannot be produced on the ground. A floating base station (1012) is disposed on the sea in such a manner as to encompass a first spherical shell portion (1002a) constituting one end of the tank and inside this floating base station, a cylindrical portion continuing from the first spherical shell portion is constituted and then a second spherical shell portion (1002b) for constituting the other end of the tank is so fitted so as to close the open end of the cylindrical portion.