Ordinance on Industrial Safety and Health
Ministry of Labour Ordinance No. 32 of September 30, 1972
Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 47 of March 30, 2007
In Japanese
掲載日：2008.03.28
Part II Safety Standards
Chapter IV Prevention of Explosion, Fire, etc
Section 7-2 Concrete Breaking Work
Article 321-2 (Standards for Concrete Breaking Work)
- (1) The employer shall, when carrying out the breaking work using a concrete breaker, comply with the following provisions:
- (i) When charging a concrete breaker, to prohibit the use of naked fire or smoking nearby.
- (ii) To use a safe charging tool, which is unlikely to cause ignition of the concrete breaker due to friction, shock, static electricity, etc.
- (iii) To use a safe stemming, which is unlikely to cause ignition or inflammation, such as cement mortar or sand.
- (iv) To take measures to prevent broke substances, etc., from scattering.
- (v) When the charged concrete breaker does not ignite after ignition, or when it is difficult to confirm that the charged concrete breaker has ignited, to remove the lead wire of the said blaster from the igniter and make the end of the said lead wire a short-circuit, and to take measures to prevent re-ignition; and not to allow the worker engaging in the concrete breaking work to approach the place where the said concrete breaker is charged within five minutes after the above measures had been taken.
Article 321-3 (Appointment of an Operations Chief of Concrete Breaking)
- (1) The employer shall, as regards the work set forth in item (viii)-2 of Article 6 of the Order, appoint an operations chief of concrete breaking from the persons who have completed the skill training course for operations chief of concrete breaking.
Article 321-4 (Duties of an Operations Chief of Concrete Breaking)
- (1) The employer shall have an operations chief of concrete breaking carry out the following matters:
- (i) To decide a work method and supervise the work directly.
- (ii) To instruct workers engaging in the said work on the place for evacuation and the route to the place.
- (iii) To confirm that workers have been evacuated the dangerous area before ignition.
- (iv) To appoint a worker in charge of ignition.
- (v) To give a signal of ignition.
- (vi) To check misfires or residual gunpowder.
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