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.
Subsection 2 Prevention of Dangers Due to Collapse of Natural Ground, etc
Article 407 (Standards of Gradient of Excavation Surface)
- (1) The employer shall, when carrying out the excavating work for quarrying (excluding the work in a pit, hereinafter the same shall apply in this Article), make the gradient of the said excavation surface the value listed in the right column of the following table or less corresponding to the type of natural ground listed in the left column of the same table and the height of the excavation surface listed in the middle column of the same table respectively. However, this shall not apply to the case of carrying out the excavating work using an excavating machines such as a power shovel and a tractor shovel, and when it is unlikely to cause danger to the operator of the said excavating machine due to collapse of natural ground or fallen earth and rocks:
Type of natural ground Height of excavation surface (m) Gradient of excavation surface (degree) (1) Natural ground composed of rock beds having no cracks that may cause collapse or fall Less than 20 90 20 or more 75 (2) Natural ground composed of rock beds other than those listed in the preceding item Less than 5 90 5 or more 60 (3) Natural ground other than those listed in the preceding each item Less than 2 90 2 or more 45
Article 408 (Prevention of Dangers Due to Collapse, etc.)
- (1) The employer shall, in the case of carrying out quarrying work (excluding work carried out in a pit) and when there exist earth and rocks, standing trees, etc., which are liable to cause dangers to workers due to collapse or fall, take measures to prevent the said dangers by removing them, providing a protective net, etc.
Article 409 (Prevention of Dangers Due to Cave-in, etc.)
- (1) The employer shall, in the case of carrying out a quarrying work in a pit and when it is liable to cause dangers to workers due to cave-in, fallen rocks or collapsed sidewalls, take measures to prevent the said dangers by providing supports or residual poles, making the ceiling an arch, using lock bolts, etc
Article 410 (Prohibition of Work Adjacent to Excavation Sites)
- (1) The employer shall not carry out the small cant or rock processing work adjacent to an excavation site. However, this shall not apply to when it is extremely difficult to move the said rocks to other places.
Article 411 (Prohibition of Entry)
- (1) The employer shall not allow a worker to enter a place downward of place where carrying out an excavating work for collecting rocks and where it is liable to cause dangers to workers due to fallen earth and rocks.
Article 412 (Wearing of a Safety Helmet)
- (1) The employer shall, when carrying out quarrying work, have the worker engaging in the said work wear a safety helmet in order to prevent workers from dangers due to flying or falling objects.
- (2) A worker shall, when having been instructed to wear a safety helmet, wear the safety helmet set forth in the same paragraph.
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