| 摘要 |
PROBLEM TO BE SOLVED: To provide a center foldable mini shield machine for expanding a useful space in a shield body more than a conventional space, and shortening the machine length more than the conventional machine length. SOLUTION: This mini shield machine connects a front body 1a and a front intermediate body 1b and the front intermediate body 1b and a rear intermediate body 1c via brackets 20 and 20' so as to be rockable in the vertical direction with a lower connecting pin 8 as a fulcrum by upper-lower connecting pins 8. A first center foldable jack 3 for mutually rocking the front body 1a and the front intermediate body 1b and a second center foldable jack 3 for mutually rocking the front intermediate body 1b and the rear intermediate body 1c, are respectively symmetrically arranged by one unit on the left and right in the shield body 1 on the upward directional side. Three jacking jacks 4 fewer than a conventional jack are arranged at equal intervals in the peripheral direction of the shield body 1 by overlapping mutual end parts in the shaft direction of the shield body 1 with both the second center foldable jacks 3, and are arranged by avoiding a central part of the shield body 1. COPYRIGHT: (C)2004,JPO&NCIPI
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