| 摘要 |
PROBLEM TO BE SOLVED: To provide a spraying method reducing the rebound ratio of a spray material.SOLUTION: A spray material is injected from a nozzle 31, and a wall body made of compaction soil containing bentonite is constructed in a disposal facility 101 below the generally used depth for radioactive waste 103 by a spraying method. The spraying method includes: a first spraying step of forming first spray band parts 54 extending horizontally on a predetermined spraying surface so that the plurality of first spray band parts are mutually and partially overlapped sequentially from the bottom and arranged with a substantially equal spacing in the vertical direction, thereby forming a first spray part 52 having a plurality of ridge parts 54a and a plurality of valley parts 54c alternately appearing in the vertical direction; and a second spraying step of forming second spray band parts 56 extending horizontally so that the plurality of second spray band parts are arranged in the vertical direction so as to fill the valley parts 54c of the first spray part 52, thereby forming a second spray part 53 on the first spray part 52. |
