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    • 5. 发明专利
    • DIAGNOSIS METHOD FOR SOUNDNESS OF UNDERGROUND CONSTRUCTION
    • JPH09196897A
    • 1997-07-31
    • JP799396
    • 1996-01-22
    • MITSUBISHI HEAVY IND LTD
    • TANAKA MAMORUMISHIMA TOSHIHIKOTOMITA MITSURUNAKAMORI NOBUO
    • G01N29/12G01H17/00
    • PROBLEM TO BE SOLVED: To facilitate the diagnosis of the soundness of an underground construction by striking the underground construction or a construction on an underground construction such as a footing foundation, and measuring its response through a submersible microphone arranged in the water in a hole provided in the ground surrounding the underground construction. SOLUTION: A covering earth on a footing foundation 1 is removed, and a boring hole 6 is bored in a surrounding ground near a foundation pipe 2. The inside of the boring hole 6 is fully filled with water by subterranean water or positively poured water, and a submersible microphone 5 is inserted at each underground position in the boring holes corresponding to the upper, middle and lower parts of the foundation pile 6. The upper face of the footing foundation 1 is struck by a hammer with a load meter 3, and then the response of the load meter of the hammer 3 with load meter and the response of the submersible microphone 5 are recorded in a computer 4, and the soundness of the foundation pole 2 is diagnosed by analyzing the wave form of the response. Boring into the footing foundation 1 becomes unnecessary, and the man-hour and cost can be therefore reduced.