Abstract of Special Research Report (RR-32)
National Institute of Occupational Safety and Health, Japan
Theoretical Analysis of Electric Field Produced by Underwater Leakage Current (2nd Report) --Effects of a Solid Body on the Field Intensity--
RR-32-1 |
Tatsuo MOTOYAMA, Eiki YAMANO and Ryuji TANAKA |
: This is one of a series of research work concerning the prevention of underwater electric shocks. |
A tree dimensional computational analysis of the wind loads on canvason or panel covered over the scaffold structure around a tall building
RR-32-2 |
Kinichi KINOSHITA |
: For the purpose of the prevention of accidents caused by falling articles from a tall building under construction and others, canvases or panels are put up over a wide range on the outside of scaffold structures which built around the building. In these circumstances there have often happened fall-down accidents of the scaffolds by a strong wind. |
A study on Time Intervals between Occupational Accidents (II)
RR-32-3 |
Shigeo HANAYAS |
: The accident frequency rate has been widely used as one of the measurement of safety performance over a long period of time. The accident frequency rate is defined as the number of occurrence of occupational accidents for a certain unit of man-power or employee hour exposure. Since the accident frequency rate, which implies the potential of accident risk in a working place, is closely related to the number of occurrence of accidents, its statistical evaluation depends mainly upon the analysis of the frequency of occurrence of accidents in a fixed interval of time, e.g., poisson distribution. |
Stability on the Saddle-type Beam for Powered Platform
RR-32-4 |
Yoshimasa KAWAJIRI and Yoshitada MORI |
: Recently, the temporary powered platform came into use as hanging scaffold in many working sites for the maintenance of exterior buildings or structures. The saddle-type beam, as shown in Fig.1, is used to suspend a working platform of powered platform from the rooftop of buildings. This is a kind of spacer which is put on the rooftop parapet of building to keep constant space between the wall of building and a working platform. |
Safety Assessment of Automated Production Systems Using Microelectronics (1st Report) --Energy-Transfer Chains and Hazards of Industrial Robots--
RR-32-5 |
Yoshinobu SATO, Noboru SUGIMOTO and Ikuo MAE |
: It is apparent that we have to receive some risks when we use the Industrial robots for production, because several cases of the injury accidents caused by robots have been already given in japan. |
Behaviour or two Rupture Disks when a Chamber Constituted by them is Pressurized by a Gas and the Quick Releasing Method of Explosion
RR-32-6 |
Heizaburo TSURUMI |
: A single rupture disk has been ordinarily used as one of the safety devices for pressure vessels. But, in this study, two rupture disks are fitted in series on a vessel as shown in Fig.2. A chamber between the two disks was filled with a pressurized gas which was air, nitrogen or helium. The sample rupture disks were made of flat aluminum plate, and the operating rupture pressure of the disk was 3.78 kgf/cm2 . The chamber gas was pressurized at the maximum 3.5 kgf/cm2 . The volume of chamber was 56.65 × 10-3 litre. The rupture pressure of the disks for the dynamic pressure were measured by the explosion of premixed hydrogen-air gases for each charged gas. |