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 1 Open-Cut Excavating Work
Subsection 2 Shoring
Article 368 (Material)
- (1) The employer shall, as regards materials of shoring, not use those having gross damage, deformation or corrosion.
Article 369 (Structure)
- (1) The employer shall make the structure of the shoring sound corresponding to landform, nature of the soil, strata, cracks, water content, spring water, freezing and underground-installed objects, etc., pertaining to the natural ground where the said shoring is installed.
Article 370 (Erection Diagram)
- (1) The employer shall, when assembling shoring, prepare in advance an erection diagram, and shall assemble it under the said erection diagram.
- (2) The erection diagram set forth in the preceding paragraph shall describe the arrangement, size and materials of members such as sheet piles, piles, shore laggings, walings, struts, and the time and procedure of installation.
Article 371 (Installation, etc., of Members)
- (1) The employer shall, as regards installation, etc., of the members of shoring etc comply with the following provisions:
- (i) To mount walings and struts firmly on sheet piles, piles, etc., to prevent them from coming off.
- (ii) To use butt joints for jointing of compression members (excluding horizontal angle braces).
- (iii) To fasten firmly the connecting portions of struts or horizontal angle braces and the crossing portions of struts with doubling plates and bolts, or connect them by welding or other method to make them sound.
- (iv) For shoring with a middle support pole, to mount struts firmly on such middle support pole.
- (v) For the case that struts are supported by things other than the members such as the columns of a structure, to make the said supports strong enough to bear the load applied.
Article 372 (Work of Installing or Removing Struts, etc.)
- (1) The employer shall, when carrying out the work set forth in item (x) of Article 6 of the Order, take the following measures:
- (i) To prohibit workers other than those concerned from entering the place where the said work is carried out.
- (ii) When raising or lowering materials, instruments or tools, to have workers use lifting ropes, lifting bags, etc.
Article 373 (Checkup)
- (1) The employer shall, when having installed shoring, check the following matters once every period not exceeding seven days, after an earthquake of medium shock or heavier, and after having happened an event, which is liable to weaken the ground rapidly due to heavy rain, etc., and immediately reinforce or repair when having found any abnormalities:
- (i) Existence and condition of damage, deformation, corrosion, displacement and coming off of members.
- (ii) Degree of compression of struts.
- (iii) Condition of the connecting portions, mounting portions and crossing portions of members.
Article 374 (Appointment of an Operations Chief of Shoring)
- (1) The employer shall, as regards the work set forth in item (x) of Article 6 of the Order, appoint an operations chief of shoring from the persons who have completed the skill training courses for operations chief of excavating natural ground and shoring.
Article 375 (Duties of an Operations Chief of Shoring)
- (1) The employer shall have an operations chief of shoring 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.
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