| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method for preventing flotation of a manhole in a ground change such as liquefaction phenomenon of the foundation.SOLUTION: A device for preventing flotation of a manhole by increasing the weight of the manhole more than the buoyancy generated in a ground change such as liquefaction phenomenon against a manhole peripheral wall 1 and a bottom part U comprises a plurality of storage bodies 2 and 22 and weights 3a and 3b. The storage bodies 2 and 22 have a storage part for storing the weights 3a and 3b, and each partition wall for surrounding the upper part, the lower part and four sides of the storage bodies 2 and 22 has a connection part for connecting with other adjacent storage bodies 2 and 22. Any of each partition wall is attached to be freely opened and closed so as to open the storage part, and each storage body 2 and 22 is arranged almost over the whole circumference of the inner peripheral side of the manhole peripheral wall 1.SELECTED DRAWING: Figure 1 |
