| 摘要 |
PROBLEM TO BE SOLVED: To easily install a crosspiece for leveling concrete by an easily manufacturable support device having a very simple structure. SOLUTION: First support devices 1 connecting a stiffner support arm 12 face upward to a straight part 11 are driven at an interval of about 2 meters, and the stiffner support arms are aligned to the same height to nip the stiffner 3. Next, a second support device 2 connecting a stiffner pressing arm 22 face downward to a straight part 21 is driven between the first support devices 1 to nip the stiffner 3 in the stiffner pressing arm and press it from above. Consequently, in this way the crosspiece for leveling concrete can be easily installed by the easily manufacturable support device having the very simple structure. COPYRIGHT: (C)2004,JPO&NCIPI
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