-
I
ãã¿ãã¡
ããæµ·åã®å¹³ããªæµ·åºäžã§,ç¶²å£ (ç¶²ã®éå£éš) ã®æšªå¹
12m ã®ç¶²
ã²
ã,äžå®ã®æ¹åã«1.2m/ç§ã®éãã§æ°Žå¹³ã«æ³ãããŠããã ããŸ,ãã
éãç¶²å£äžå€®ã®åæ¹ (å³äžå³ã®ç¹A) ã§éæ¢ããŠãããšããã å³äžå³
ã®ããã«ç¶²ã3mã®è·é¢ãŸã§è¿ã¥ããæã«ç¶²ã®ååšã«æ°ä»ããç¶²ãã
éããããšããŠéæ³³ãéå§ãããšããã éã¯éãããšãã«åžžã«äžå®ã®
æ¹åãã€äžå®ã®éåºŠã§æµ·åºé¢äžãæ°Žå¹³æ¹åã«éæ³³ã, ååã«é·ãæé
ãéæ³³ãç¶ããããšãã§ãããã®ãšããã ãªããäžåºŠç¶²å£ããç¶²ã®å
åŽã«å
¥ã£ãéã¯å¿
ãæŒç²ããããã®ãšããã ãŸã,ããã§ã¯éã®å€§ã
ãã¯èããªããã®ãšããã ãã®ãšã, 次ã®å1ããå3ã«çããªã
ãã ãªã, â2 =1.4, V3 =1.7 ãšã, ããããè§£çã®éçšã䜵ããŠç€ºããª
ããã
12m
ç¶²å£
ç¶²ãæ³ãæ¹å
ç¶²å£ããäžã«å
¥ããšæŒç²ãããã
ç¶²ã®äžãäžããã®éé¿ã¯èããªãã
ç¶²ãæ³ã
æ¹å
å1 éãç¶²ã®ååšã«æ°ä»ã, ç¶²ãæ³ãæ¹åã«å¯ŸããŠåçŽãªæ¹å(90°)
ã«éæ³³ããã éãç¶²ããéããã®ã«å¿
èŠãªéæ³³é床 (m/ç§) ãæ±ã
ãªããã
ç¶²ãæ³ãéã
II
1.2m/ç§
å2 éãç¶²ã®ååšã«æ°ä»ã, ç¶²ãæ³ãæ¹åã«å¯Ÿã㊠45Â°ã®æ¹åã«éæ³³
ããã éãç¶²ããéããã®ã«å¿
èŠãªéæ³³é床 (m/ç§) ãæ±ããªããã
å3 éãç¶²ã®ååšã«æ°ä»ã, ç¶²ãæ³ãæ¹åã«å¯Ÿã㊠30Â°ã®æ¹åã« 1.5
(m/ç§) ã®é床ã§éæ³³ããã ãã®éãæŒç²ããããšãã§ããæå°ã®
ãããã
æ³ç¶²é床 (ç¶²ãæ³ãé床 (m/ç§)) ãæ±ããªããã
6m
A
3m
6m
(ç¶²ãäžããèŠãå³)