| 摘要 |
PROBLEM TO BE SOLVED: To provide a manhole block positively preventing detachment of a manhole receiving frame from the manhole block caused by pressure in a manhole by considerably increasing the upward drawing resistance of the manhole receiving frame. SOLUTION: This manhole block is provided with a cylindrical block body 15 made of precast concrete and having an opening edge part opened upward, an anchor frame 16 formed in almost the same plane shape as the opening edge part of the block body 15 and embedded in the opening edge part, and a plurality of anchor members 17 fixed into the prescribed circumferential positions of the anchor frame 16 so that the screwed directions are uniform in a vertical direction. COPYRIGHT: (C)2005,JPO&NCIPI
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