ABSTRACT

There are more than hundred pile makers or pile construction companies at present in Japan. Four big companies are members of Japan Association for Steel Pipe Piles (JASPP), 55 companies are members of Concrete Pile Installation Association (COPITA), 44 companies are members of Nihon Kiso Kyoukai (Japanese Foundation Association), 3 companies construct timber piles, and several companies construct small-diameter pipe piles for foundations of houses.