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 3 Work in Caissons, etc.
Article 376 (Settling Diagram, etc.)
- (1) The employer shall, when carrying out the open-cut excavation work in a caisson or in a sunk well, take the following measures to prevent dangers to workers due to rapid settling of the said caisson or sunk well:
- (i) To determine the method of excavation, the quantity of load, etc., based on a settling diagram.
- (ii) To have the height from the cutting edge to the ceiling or the girder of 1.8 m or higher.
Article 377 (Work in a Caisson, etc.)
- (1) The employer shall, when carrying out the open-cut excavation work in a caisson, a sunk well, a vertical shaft, a well or other buildings or facilities similar to them (hereinafter referred to as “caissons, etc.”), take the following measures:
- (i) When the quantity of oxygen may become excessive, to designate a person in charge of measuring the concentration of oxygen, and have the said person measures the concentration.
- (ii) To provide facilities for safe ascent and descent of workers.
- (iii) When the depth of excavation exceeds 20 m, to provide devices such as a telephone, an electric bell, etc., for communication between the work place and the outside.
- (2) The employer shall, in the case prescribed in the preceding paragraph, when excessive oxygen is observed as a result of the measurement set forth in item (i) of the same paragraph, or when the depth of excavation exceeds 20 m, provide facilities for sending air and feed the necessary quantity of air using the said facilities.
Article 378 (Prohibition of Work)
- (1) The employer shall, when falling under any of the following each item, not carry out the open-cut excavation work in caissons, etc:
- (i) When the facilities set forth in item (ii) or (iii) of paragraph (1) of the preceding Article or in paragraph (2) of the same Article are out of order.
- (ii) When it is liable to cause penetrating a large quantity of water into the caissons, etc.
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