| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a structure for preventing the projection and lift of a manhole capable of suppressing the projection and lift of the manhole which are caused by the liquefaction of a ground occurring in an earthquake within an allowable limits, eliminating the need of a large-scaled construction by an extremely simple structure, enabling the construction to be performed at low cost in a short time, and easily applicable even to existing manholes. Ž<P>SOLUTION: In this structure for preventing the projection and lift of the manhole 1, ring-like support frames 7 are arranged at intervals around the upper part of a buried manhole body 3, a support frame 10 on which a manhole cover 9 is installed is mounted on the support frame 7, and a sealing material 12 is attached to the gap S between the manhole body 3 and the support frame 7. The water W in the ground 2 which is produced during the liquefaction flows out into the manhole body 3 through the sealing material 12. The projection and lift of the manhole are prevented from occurring by the weight of the ring-like support frame 7 and a load placed on a nonshrinkage concrete 13. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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