Abstract of RIIS Report ( SH-1960-1 )
National Institute of Occupational Safety and Health, Japan
Report on the Load Tests of Steel Arch-Supports for Tunnelling
SH-1960-1-1 |
Yoshitada MORI |
: The use of steel arch-supports in the tunnelling is increasing recently in Japan. This tendency is due to the fact that steal arch supports are superior to timberings from many view-points, in order to protect a person from the fall of roof of tunnel. |
Measurement of Frictional Coefficient of Ingot-Tongs-Tips in Lifting Materials
SH-1960-1-2 |
E.AKIYAMA and T.HAKAMAZUKA |
: The frictional coefficient of tongs-tips with various radius were measured with the experimental apparatus. We obtained the following result. The friction differed from the general idea, that is to say, the kinetic frictional force was larger than the conventional statical force under the same load, and the more the tip slided, the more the value rose. The statical frictional coefficient was in the range between 0.17 and 0.35. The radius of tip did not affect the value of the coefficient. |
Shift-System Labor and its Burdens on the Living Body
SH-1960-1-3 |
C.GOTOH |
: In order to make clear how the labor of shift system affects the living body and to establish the counter measures necessary for maintaining the health of workers by determining the rational form of labor, the writer conducted investigations as follows: |