Abstract of Special Research Report (SRR-80-1)
National Institute of Occupational Safety and Health, Japan
Special Research on Integrated Preventive Countermeasures against Natural Gas Explosion and Firre in Tunnelling Work
Introduction
SRR-80-1-1 |
Yoshitada MORI |
: In the last few years, serious accidents including many casualties due to the explosion of gushing natural gas and fire in tunnelling work occurred one after the other. As this type of accident has been uncommon to tunnelling work in Japan up to the present, there has been insufficient attention given to planning for safety in case of gas explosion and fire.
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Improvement of the Ventilation Systems used by Tunneling Workswhere Mathane Gushes Out
SRR-80-1-2 |
Yoshinobu SATO, Soichi KUMEKAWA, Noboru SUGIMOTO and Kiyoshi FUKAYA |
: To improve the ventilation systems used by the tunneling works where methane gushes out, the experiments in the diffusion of methane with model tunnels and the examinations of the systems are practiced. |
Gas Alarm Systems for Tunnel Works
SRR-80-1-3 |
Toshihiro HAYASHI, Hidenori MATSUI and Michio NAITO |
: Explosions of methane are the most serious disasters encountered in tunnel works carried out in such strata containing natural gases. One of the effective methods to avoid such explosion hazard is air ventilation through a tunnel under construction. Although there have been used several types of air ventilating system, none of them is said to be satisfactory from the viewpoint of preventing methane accumulation. A suitable gas alarm system, therefore, should be introduced into every tunnel works in order that methane concentration in air flow is monitored continuously and that warning alarms are given, if methane concentration in the tunnel exceeds a certain threshold, so that any adequate precautions are to be taken successively. The gas alarm system for such temporary works as tunnelling should be not only that to ensure safety, but also be economical. This report describes the method of constituting a gas alarm system for practical use in tunnel works. |
Prevebtive Countermeasyres against Fire in Tunnelling Work
SRR-80-1-4 |
Ikuo MAE, Shigeo HANAYASU, Yoshimi SUZUKI and Noriyuki HORII |
: It may be considered that the probability of occurrence of accidents due to fire in tunnelling work has been increasing since the introduction of the increased use of combustible materials and the increment of the activities using fire in the construction process. In fact, not a few serious accidents due to fire in tunnelling work have taken place recently. |
A Study on the Geological Characteristics of Stratums Containing Natural Gas in Tunnelling Work
SRR-80-1-5 |
Ikuo MAE, Shigeo HANAYASU, Yoshimi SUZUKI and Noriyuki HORII |
: Since the increment of construction of tunnels, the necessity of excavation of tunnels where the stratums contain natural gas, is increasing.
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Development of Explosion-Protected Electricalapparatus for use on Tunnelling Sites
SRR-80-1-6 |
Katsuhiro SAKAMUSHI |
: In tunnelling workplaces where methane or other combustible gas/vapor wells out, it is possible that explosion or fire may be caused by electrical spark or heating of electrical equipments. One of the prevention methods for those hazards is to use the appropriate explosion-protected apparatus in the tunnel construction.
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