| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure rock abrasion capability on the site by a portable rock abrasion capability measuring tool. <P>SOLUTION: A portable rock abrasion capability measuring tool M<SB POS="POST">1</SB>capable of measuring abrasion capability of a rock R at an original position includes a cylindrical measuring tool body B, a test needle S housed in a tip side of the measuring tool body B to be insertable and extractable with the maximum projection length regulated, wherein a tip of a steel bar is a cylindrically formed a piercing part Sa, a compression spring K housed in the measuring tool body B to energize the test needle S in a projection direction, test needle coming-out prevention means comprising many steel balls 22 and an O ring 23 for preventing the test needle S from coming out of the measuring tool body B due to self-weight, and an adjustment bolt F provided integrally with a side opposite to the test needle S in the measuring tool body B to adjust the energization force of the compression spring K. <P>COPYRIGHT: (C)2013,JPO&INPIT |
