| 摘要 |
PROBLEM TO BE SOLVED: To provide a door device being suitable for opening and closing an opening for construction work (a construction work opening) formed on a side wall of a tank, having a simple structure, and capable of constructing the large-size tank inexpensively when constructing the tank. SOLUTION: This door device for opening and closing the opening for construction work formed on the side wall of the tank to construct the tank includes a carrier positioned on an outer side of the tank and advancing toward the opening for construction work and backing from the opening for construction work and a door formed to cover the opening for construction work and mounted on the carrier. COPYRIGHT: (C)2011,JPO&INPIT |
