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 2 Construction Work of Tunnels, etc
Subsection 1 Investigation, etc.
Article 379 (Investigation and Record)
- (1) The employer shall, when carrying out the excavating work of tunnels, etc., investigate in advance the landform of natural ground and condition of the nature of the soil and strata pertaining to said excavation work by boring or other appropriate method in order to prevent workers from dangers due to cave-in, inundation, gas explosion, etc., and record the result of the investigation.
Article 380 (Construction Plan)
- (1) The employer shall, when carrying out excavating work of tunnels, etc., establish in advance a construction plan in conformity with what is known by the investigation prescribed in the preceding Article, and carry out the work by the said plan.
- (2) The construction plan set forth in the preceding paragraph shall be the one describing the following matters:
- (i) Method of excavation.
- (ii) Method of construction of tunnel shoring, construction of lining, disposal of spring water or flammable gas, and ventilation or illumination when these are carried out.
Article 381 (Observation and Record)
- (1) The employer shall, when carrying out excavating work of tunnels, etc., observe the excavation site and surrounding natural ground every day as to the following matters in order to prevent dangers to workers due to cave-in, inundation, gas explosion, etc., and record the results of the said observation:
- (i) Conditions of nature of the soil and strata.
- (ii) Existence and condition of water content, and spring water.
- (iii) Existence and condition of flammable gas.
- (iv) Existence and condition of high-temperature gas or vapor.
- (2) The observation pertaining to the matters set forth in item (iii) of the preceding paragraph shall, in the case that the excavation is carried out by the method that excavation site and its surrounding natural ground are covered with machine, be carried out using a measuring instrument .
Article 382 (Checkup)
- (1) The employer shall, when carrying out construction work of tunnel, etc., (meaning an excavating work of tunnels, etc., or transportation of muck, materials, etc., or concrete placing, etc., work of lining associated with it(limited to the work carried out in the said tunnel, etc., or at a place near the said tunnel, etc.); the same shall apply hereinafter), take the following measures to prevent the dangers to workers due to cave-in or fall of rocks:
- (i) To designate a checker and have the said person check the ground in tunnels, etc., every day and after an earthquake of medium shock or heavier as to the existence and condition of loose stones and cracks, and changes in the condition of water content and spring water.
- (ii) To designate a checker and have the said person check after blasting operations the location where the said blasting operations have been carried out and its surroundings as to the existence and condition of loose stones and cracks.
Article 382-2 (Measurement, etc., of the Concentration of Flammable Gas)
- (1) The employer shall, in the case of a construction work of tunnels, etc., the flammable gases are liable to be generated , designate a person charged with the measurement of the concentration of the flammable gases in order to prevent an explosion or fire and have the said person measure and record the concentration of the flammable gas at the places where the said flammable gases are liable to be generated or stagnate, every day before commencing the work for the day, after an earthquake of medium shock or heavier or when having found any abnormalities related to the said flammable gases.
Article 382-3 (Installation, etc., of Automatic Alarms)
- (1) The employer shall, when it is found as a result of the measurement set forth in the preceding Article that the flammable gases exist and is liable to cause an explosion or fire, install automatic alarms at necessary places for an early detection of abnormal rise in the concentration of the flammable gases. In this case, the said automatic alarms shall have system, which is able to quickly alert workers who are working around the area of the detectors of the automatic alarms to the abnormal rises in the concentration of the said flammable gas.
- (2) The employer shall, as regards the automatic alarm device set forth in the preceding paragraph, check the following matters before commencing the work for the day, and immediately repair when having found any abnormalities:
- (i) Abnormalities in the measuring gauges.
- (ii) Abnormalities in detectors.
- (iii) Function of the alarms.
Article 383 (Alteration in Construction Plan)
- (1) The employer shall, in the case of carrying out excavating work of tunnels, etc., and when the construction plan set forth in paragraph (1) of Article 380 becomes unsuitable to the conditions of natural ground which was known by the observation pursuant to the provision of paragraph (1) of Article 381, the checkup pursuant to the provision of Article 382, the measurement pursuant to the provision of Article 382-2, etc., alter such construction plan without delay so that it may suit the conditions of the said natural ground, and carry out the excavating work by the changed construction plan.
Article 383-2 (Appointment of an Operations Chief of Excavating Tunnel, etc.)
- (1) The employer shall, as regards the work set forth in item (x)-2 of Article 6 of the Order, appoint an operations chief of excavating tunnel, etc., from the persons who have completed the skill training course for operation chief of excavating tunnel, etc.
Article 383-3 (Duties of an Operations Chief of Excavating Tunnel, etc.)
- (1) The employer shall have an operations chief of excavating tunnel, etc., carry out the following matters:
- (i) To decide a work method and arrangement of workers, and supervise the work directly.
- (ii) To check the function of an instrument, a tool, a safety belt, etc., and a safety helmet, and remove defective ones.
- (iii) To monitor the use of a safety belt, etc., and a safety helmet.
Article 383-4 (Appointment of an Operations Chief of Lining of Tunnel, etc.)
- (1) The employer shall, as regards the work set forth in item (x)-3 of Article 6 of the Order, appoint an operations chief of lining of tunnel, etc., from the persons who have completed the skill training course for operations chief of lining of tunnel, etc.
Article 383-5 (Duties of an Operations Chief of Lining of Tunnel, etc.)
- (1) The employer shall have an operations chief of lining of tunnel, etc., carry out the following matters:
- (i) To decide a work method and arrangement of workers, and supervise the work directly.
- (ii) To check the function of an instrument, a tool, a safety belt, etc., and a safety helmet, and remove defective ones.
- (iii) To monitor the use of a safety belt, etc., and a safety helmet.
このページの先頭へ