Patents by Inventor Tukasi Chiba

Tukasi Chiba has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Easily-cuttable tunnel segment structure
    Patent number: 7004679
    Abstract: The present invention relates to a novel easily-cuttable tunnel segment structure used for the departure of a shield machine from a main tunnel to a branch tunnel or the return to the main tunnel from the branch tunnel, and provides an easily-cuttable tunnel segment structure 1 constructed by connecting a plurality of easily-cuttable tunnel segment pieces 2 in the longitudinal direction of a tunnel, wherein at least an easily-cuttable area 3 is formed by concrete 7 in which easily-cuttable reinforcement members are arranged, and a join disposed at least in the easily-cuttable area 3 in the longitudinal direction has an easily-cuttable join structure.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: February 28, 2006
    Assignees: Nippon Steel Corporation, Taisei Corporation, GEOSTR Corporation
    Inventors: Ryoichi Naka, Toshihiko Yoshizumi, Shinichi Nakata, Fumio Kondoh, Seiichi Satoh, Osamu Ishita, Yutaka Fujino, Tukasi Chiba
  • Easily-cuttable tunnel segment structure
    Publication number: 20030113168
    Abstract: The present invention relates to a novel easily-cuttable tunnel segment structure used for the departure of a shield machine from a main tunnel to a branch tunnel or the return to the main tunnel from the branch tunnel, and provides an easily-cuttable tunnel segment structure 1 constructed by connecting a plurality of easily-cuttable tunnel segment pieces 2 in the longitudinal direction of a tunnel, wherein at least an easily-cuttable area 3 is formed by concrete 7 in which easily-cuttable reinforcement members are arranged, and a join disposed at least in the easily-cuttable area 3 in the longitudinal direction has an easily-cuttable join structure.
    Type: Application
    Filed: November 21, 2002
    Publication date: June 19, 2003
    Inventors: Ryoichi Naka, Toshihiko Yoshizumi, Shinichi Nakata, Fumio Kondoh, Seiichi Satoh, Osamu Ishita, Yutaka Fujino, Tukasi Chiba