| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure bearing member which is advantageous to improve branch tunnel construction efficiency when a branch tunnel is constructed from a narrow master tunnel. SOLUTION: A reaction bearing member 52 has a profile insertable into a rear trunk 50 of a shield machine, and is formed of: front and rear substrates 54, 56 which exhibit an annular shape and face to each other; and a plurality of column members 58 arranged between the front and rear substrates 54, 56 at circumferential intervals in a manner extending longitudinally, for connecting between the front and rear substrates 54, 56. The reaction bearing member 52 is incorporated in the rear trunk 50, and exposed in the master tunnel 12 according to the advancement of the shield machine 19, to take up a space inside the master tunnel 12. When a plurality ones of the column members 58 and the rear substrate 56 are detached, an opening 60 is formed therein in a manner opening in a lateral direction and in an axial direction of the reaction bearing member 52, and materials and equipment are taken in the interior of the shield machine 19 while excavated soil is discharged via the opening 60. COPYRIGHT: (C)2008,JPO&INPIT
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