Patents Assigned to Nishimatsu Construction Company, Ltd.
  • Method of forcibly introducing a curved steel pipe into the ground and a machine therefor
    Patent number: 4062196
    Abstract: A method of forcibly introducing a curved steel pipe into the ground which comprises forcibly introducing into the ground a curved steel pipe in which has been encased an auger train consisting of a plurality of augers coupled in flexible manner with universal joints by jacking said pipe from its rear, rotating said auger train within said curved steel pipe, and conveying away the excavated earth and sand through said pipe, and a curved steel pipe pressing-in machine used in the above method.
    Type: Grant
    Filed: August 2, 1976
    Date of Patent: December 13, 1977
    Assignee: Nishimatsu Construction Company, Ltd.
    Inventors: Hiroshi Yoshida, Yoshitaka Kuwabara, Hideo Tsuchida