| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of suppressing a mortar filling failure or a composition failure at a joint part between a recessed part inner surface and an inserted body outer surface in a hub ring plate having a structure where a cylindrical inserted body having a gas blowing-in function is fitted in a recessed part annularly provided in communication with the inner hole of a plate body via mortar.SOLUTION: The hub ring plate includes a recessed part side wall tapered surface 12a provided in the side wall part of a recessed part 12 into which an inserted body 13 is fitted, and an inserted body side wall tapered surface 13a provided in the outer surface of the inserted body 13 to face and abut on the recessed part side wall tapered surface 12a, the shortest length Gg of an inner hole longitudinal axis direction between a recessed part bottom surface 12b and an inserted body bottom surface 13b is smaller than the shortest length Gt of an inner hole longitudinal axis direction between the tapered surfaces 12a and 13a.SELECTED DRAWING: Figure 2 |
