| 摘要 |
PROBLEM TO BE SOLVED: To provide a lining member which can sufficiently absorb tail clearances on both longitudinal ends of an existing segment, in a width-enlarging type shield excavator. SOLUTION: The width-enlarging type shield excavator comprises a main excavator (1) and sub-excavators (2a, 2b) provided on both sides thereof. An axial line of each of the sub-excavators (2a, 2b) is displaced relative to an axial line of the main excavator (1) so that excavation may be conducted while enlarging the width. The lining member (4) used for the width-enlarging type shield excavator comprises a plurality of pieces including at least four corner parts (20a) as in Fig. 4. A bolt fitting hole (20A) for fitting a new segment (20A) to the existing segment (20) of each of the corner parts (20a) is formed to be an arc-like long hole having a center of the segment as the center of the arc-like shape. COPYRIGHT: (C)2007,JPO&INPIT
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