| 摘要 |
PROBLEM TO BE SOLVED: To prevent a manhole from being raised by an earthquake. SOLUTION: This manhole burial structure comprises a sandbag layer formed by burying an area starting at the lowermost layer of the manhole to at least the height thereof covering the upper part of a sewer by sandbags. Since a sand layer causing liquefaction can be eliminated and replaced with the sandbags not causing the liquefaction, the manhole can be prevented from being raised due to the liquefaction. Also, since the sandbags can be deformed along the structure because it is not hard, stress is not concentrated even if the sandbags come into contact with the sewer. As a result, the possibility of the rupture of the sewer can be reduced. COPYRIGHT: (C)2006,JPO&NCIPI
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