| 摘要 |
PURPOSE:To promote function efficiency by housing a spherical body as an excavation room in the inside of the front end of a cylindrical body as a skin- plate so that it is capable of rotation, and housing a built-in shield excavator in the inside of the spherical body. CONSTITUTION:An external shield excavator A is positioned perpendicularly and downward, and an excavation blade 3 of a built-in shield excavator B of a spherical excavation room 2 is driven forward to a segment S with reaction force to construct a vertical shaft. After that, when the shaft reaches a specific depth, the excavation of the excavator A is suspended, and the excavation blade 3 is housed in the excavation room 2. Then, a rotating jack 7 is expanded to rotate the excavation room 2 until the position of the excavation blade 3 correspond to a circular window 6, one side of wall-boards of the excavation room 2 is disassembled, it is reassembled in the opposite side of an entrance to always secure the position of a doorway 4, and the excavator B is driven forward. According to the constitution, function efficiency can be promoted by changing a driving direction to a right-angled direction. |
