| 摘要 |
PROBLEM TO BE SOLVED: To enable the easy touching and detaching of covering bodies on notched parts of a land-leveling body and the sure keeping of the state of installation of the covering bodies while the covering bodies are attached on the notched parts. SOLUTION: Removable covering bodies 55, 56, 57 are attached on the notched parts 52, 53, 54 formed on the grounding side of the land-leveling body 23, and they are fixed with fixing means 65, 66, 67. The fixing means 65, 66, 67 comprise engaging parts 71-74 and 91-94 of one side, which are placed on plural positions facing to the notched parts 52, 53, 54, engaging parts 75-78 and 95-98 of the other side, which are placed on each of plural positions of the covering body 55, 56, 57, and slip stopping metal fittings 79, 99, 100 holding the state of engagement of the engaging parts 75-78 and 95-98 of the other side, against the engaging parts 71-74 and 91-94 of one side. The engaging parts 71-74 and 91-94 of one side consist of female-type members, and the engaging parts 75-78 and 95-98 of the other side consist of male-type members which freely engaged with and disengaged from the engaging parts 71-74 and 91-94 of one side by sliding the covering bodies 55, 56, 57 into the direction perpendicular to a traveling direction of the land-leveling body 23.
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