| 摘要 |
PROBLEM TO BE SOLVED: To easily and accurately close a connecting recess which is formed at the edge of a segment, and to surely support a cover member for covering the connecting recess. SOLUTION: This closing structure comprises: a mounting base 11 which is engaged to a bolt 7 for connecting the segments 1 together, by using a magnet 10; a rotating part 16 which can be freely rotated with respect to the mounting base 11; a slot 20 which is provided in the rotating part 16; a supporting shaft 23, one end 23a of which passes through the slot 20 so as to be freely slidable, the other end 23b of which is almost orthogonally elongated out to the almost central part of the opening of the connecting recess 3, and which makes the length of elongation freely adjustable by means of nuts 26 and 27 at one end 23a; a cover 30 which covers the opening of the connecting recess 3, the almost central part of which is equipped with a hole part 31, and which is fixed to the other end 23b of the supporting shaft by means of a nut 37; an inflow passage 24 which passes through both the ends of he supporting shaft 23, and which is equipped with a branch part 24a opened in the side surface of one end 23a; and a filler 41 which is to be infilled into a space in the connecting recess 3 covered with the cover 30 via the inflow passage 24. COPYRIGHT: (C)2007,JPO&INPIT
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