METHOD OF INSPECTING EXTERIOR WALL OF UNDERGROUND REPOSITORY AND UNDERGROUND REPOSITORY

摘要

PROBLEM TO BE SOLVED: To provide a method of detecting pin holes and cracks in the FRP layer of an exterior wall comprising a steel sheet, heat insulation layer, and the outermost FRP layer when inspecting the exterior wall of a repository buried in an underground, and to provide an underground repository structured suitable for the method when performing the inspection.SOLUTION: A connection pipe (socket) the base end of which is welded airtight to the steel plate 31 is vertically installed at one portion of the exterior wall so as to face the inside of the underground repository. A through-hole communicating with the hollow hole of the socket is formed in the steel plate and the heat insulation layer. After the FRP layer is formed on the outer side of the heat insulation layer and hardened, a pressurized air source and a pressure gauge are connected to the socket 38, a pressurized air is supplied to the socket, and a variation in the detected pressure on the pressure gauge is read. When the detected pressure does not decrease even after the supply of the pressurized air is stopped, it is determined that pin holes or cracks are not present in the FRP layer. The socket and the through-holes are kept undisturbed.