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 VI Prevention of Dangers in Excavating Work, etc.
Section 3 Quarrying Work
Subsection 1 Investigation, Quarrying Work Plan, etc.
Article 399 (Investigation and Record)
- (1) The employer shall, when carrying out the quarrying work (meaning excavating work for collecting rocks, work cutting in-blocks, processing and transporting rocks at quarry, and other works associating with these works; the same shall apply hereinafter), investigate in advance the landform and condition of the nature of the soil and strata pertaining to the said quarrying work in order to prevent workers from dangers due to collapse of the natural ground, falling of an excavating machines, etc., and record the result of the investigation.
Article 400 (Quarrying Work Plan)
- (1) The employer shall, when carrying out a quarrying work, establish in advance a quarrying work plan in conformity with what is known by the investigation pursuant to the provision of the preceding Article, and carry out the work by the said work plan.
- (2) The quarrying work plan set forth in the preceding paragraph shall be the one describing the following matters:
- (i) For distinction of open casting or underground casting and for open casting, distinction of the step quarrying system, slope quarrying system or glory hole system.
- (ii) The height and gradient of the excavation surface.
- (iii) The position and depth of the steps of the excavation surface.
- (iv) The method of preventing cave-in, falls of rocks and collapse of sidewalls in the pit.
- (v) The method of blasting.
- (vi) The method of cut in-blocks.
- (vii) The place of processing rocks.
- (viii) The method of loading, transporting earth and sand or rocks and the route of transportation.
- (ix) The type and capability of excavating machines, cut in-block machines, loading machines or transporting machines to be used.
- (x) The method of disposing surface earth or spring water.
Article 401 (Checkup)
- (1) The employer shall, when carrying out a quarrying work, take the following measures for preventing dangers to workers due to collapse of the natural ground or fallen earth and rocks:
- (i) To designate a checker and have the said person check on the natural ground of the work place and its surroundings, before commencing the work for the day, after a heavy rain and an earthquake of medium shock or heavier, as to existence and condition of loose stones and cracks, and as to changes in the condition of water content, spring water and freezing.
- (ii) To designate a checker and have the said person check after blasting the place where the blasting has been carried out and its surroundings as to existence and condition of loose stones and cracks.
Article 402 (Alteration in Quarrying Work Plan)
- (1) The employer shall, when carrying out a quarrying work in which the quarrying work plan described in paragraph (1) of Article 400 becomes unsuitable to the conditions of natural ground which was known by the checkup, etc. pursuant to the provision of the preceding Article, etc., alter without delay the said quarrying work plan so as to suit such conditions of such ground, and carry out the quarrying work by the changed quarrying work plan.
Article 403 (Appointment of an Operations Chief of Excavating for Quarrying)
- (1) The employer shall, as regards the work set forth in item (xi) of Article 6 of the Order, appoint an operations chief of excavating for quarrying from the persons who have completed the skill training course for operations chief of excavating for quarrying.
Article 404 (Duties of an Operations Chief of Excavating for Quarrying)
- (1) The employer shall have an operations chief of excavating for quarrying carry out the following matters:
- (i) To decide a work method and supervise the work directly.
- (ii) To check defects in material, an instrument and a tool, and remove defective ones.
- (iii) To monitor the use of a safety belt, etc., and a safety helmet.
- (iv) To instruct in advance the method of evacuation.
Article 405 (Maintenance of Communication with Adjacent Quarries)
- (1) The employer shall, to prevent workers from dangers due to collapse of natural ground, flying earth and rocks, etc., maintain communication with adjacent quarries as to the necessary matters such as time of blasting, the method of removal of loose stones which are adopted in the adjacent quarries.
Article 406 (Maintenance of Illumination)
- (1) The employer shall, as regards a place where carrying out the quarrying work, maintain the necessary illumination for carrying out the said work safely.
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