BRANCH PART SEGMENT

Japanese Patent JP3865905

B2

PROBLEM TO BE SOLVED: To reduce the cost of a branch part segment used in a branch place or a joining place between a single track tunnel and a multiple tunnel and attain high efficiency of branch part segment installation work.
SOLUTION: A branch part segment 11 is composed of a base part segment part 12 connected to a support body disposed between cylindrical parts, and a pair of branch segment parts 13 with one end side jointed to the base part segment part 12 and with the other end side connected to segments constituting the cylindrical parts. Insert-through holes 18, 14 communicating with each other are formed in the base part segment part 12 and branch segment parts 13. Nuts 19 are fastened to jointing bolts 15 inserted through the insert-through holes 18, 14, to joint the base part segment part 12 and branch segment parts 13. The insert-through holes 18 of the base part segment part 12 are formed in an oblong hole cross section along a cross direction so as to make the branch segment parts 13 movable along the insert-through holes 18 of the base part segment part 12.

Hirohide Hashimoto
Kazuhiro Kobayashi
Shinichiro Ota
Kiyoshi Miya
Yoshihiro Tanaka

JP32505697A

January 10, 2007

November 26, 1997

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Ishikawajima Building Materials Industry Co., Ltd.
Obayashi Corporation

E21D11/08; E21D11/04; (IPC1-7): E21D11/08

JP1312198A
JP3032698U

Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Kobayashi Yoshinori
Masakazu Aoyama
Sonoda Yoshitaka
Suzuki Mitsuyoshi
Yutaka Matsutomi
Kazuya Nishi
Kenichi Imamura
Yasuhiko Murayama
Mitsuru Oba

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