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 II Construction Machine, etc
Section 1 Vehicle Type Construction Machine
Subsection 2 Prevention of Dangers Pertaining to the Use of a Vehicle Type Construction Machine
Article 154 (Investigation and Record)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine, investigate in advance the landform and condition of the nature of the soil, etc., of the place pertaining to the said work in order to prevent workers from dangers due to falling of the said machine, collapse of natural ground, etc., and record the result of the investigation.
Article 155 (Work Plan)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine, establish in advance a work plan in conformity with what is known by the investigation pursuant to the provision of preceding Article, and carry out the work by the said work plan.
- (2) The work plan set forth in the preceding paragraph shall be the one describing the following matters:
- (i) The type and capability of the vehicle type construction machine to be used.
- (ii) The travelling route of the vehicle type construction machine.
- (iii) The work method by the vehicle type construction machine.
- (3) The employer shall, when having established the work plan set forth in paragraph (1), make the matters set forth in item (ii) and (iii) of the preceding paragraph known to the workers concerned.
Article 156 (Speed Limit)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine (excluding the one having maximum speed of10 km/h or less), in advance, set the appropriate speed limit for the vehicle type construction machine corresponding to the landform and conditions of nature of the soil, etc., of the place pertaining to the said work and carry out the work by the set speed limit.
- (2) The operator of the vehicle type construction machine set forth in the preceding paragraph shall not operate the vehicle type construction machine at speeds exceeding the speed limit set forth in the same paragraph.
Article 157 (Prevention of Falling, etc.)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine, take necessary measures for the travelling route of the said machine etc., such as preventing collapse of shoulder and uneven settling of the ground, and maintaining the necessary width in order to prevent workers from dangers due to overturning or falling of the said machine.
- (2) The employer shall, in the case where the work using a vehicle type construction machine is carried out at road shoulder, inclined place, etc., and when it is liable to cause dangers to workers due to overturning or falling of the said machine, arrange a guide, and have the said person guide the said machine, etc.
- (3) The operator of a vehicle type construction machine set forth in the preceding paragraph shall follow the instructions given by the guide set forth in the same paragraph.
Article 158 (Prevention of Workers Being Hit)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine, not allow a worker to enter a place, which is liable to cause dangers to workers due to being hit by the vehicle type construction machine during operation. However, this shall not apply to when arranging a guide and having the said person guide the said machine, etc.
- (2) The operator of the vehicle type construction machine set forth in the preceding paragraph shall follow the instruction given by guide set forth in the proviso of the same paragraph.
Article 159 (Signals)
- (1) The employer shall, when placing a guide for operation of a vehicle type construction machine, set fixed signals and have the said guide give the signals.
- (2) The operator of the vehicle type construction machine set forth in the preceding paragraph shall follow the signals set forth in the same paragraph.
Article 160 (Measures to Be Taken in the Case of Leaving the Operating Station )
- (1) The employer shall, when the operator of a vehicle type construction machine leaves the operating station, have the said operator take the following measures:
- (i) To lower a working device of a bucket, ripper, etc., on the ground.
- (ii) To stop a prime mover and take measures such as setting the brake in order to prevent a vehicle type construction machine from breaking into a run.
- (2) The operator set forth in the preceding paragraph shall take measures listed in each item of the same paragraph when leaving the operating station of the vehicle type construction machine.
Article 161 (Transfer of Vehicle Type Construction Machine)
- (1) The employer shall, when using a loading plate, fills, etc., in the case where a vehicle type construction machine is loaded to a truck, etc., or unloaded from a truck, etc., by self-propelling or towing for transferring the said machine, comply with the following provisions in order to prevent dangers due to overturning, falling, etc. of the said machine:
- (i) To load or unload at a level and firm place.
- (ii) When using a loading plate, to use the one with a sufficient length, width and strength, and fix it securely with appropriate incline.
- (iii) When using fills or a temporary stand, etc., to secure a sufficient width, strength and appropriate incline.
Article 162 (Restriction of Riding)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine, not allow a worker to ride on places other than the seat.
Article 163 (Restriction of Use)
- (1) The employer shall, when carrying out the work using a vehicle type construction machine, abide stability, the maximum working load, etc., decided on the basis of its structure in order to prevent workers from dangers due to overturning, destruction of working device of an arm or a boom, etc.
Article 164 (Restriction on the Use for Other than Main Purpose)
- (1) The employer shall not use a vehicle type construction machine for other than its main purpose of lifting a load by a power shovel, raising or lowering a worker by a clamshell, etc.
- (2) The provisions of the preceding paragraph shall not apply to the following cases:
- (i) The case falling under all of followings, in the case where the load lifting work is carried out:
- (a) When it is unavoidable due to the nature of the work or necessary for the safe implementation of the work.
- (b) When metal parts of a hook and a shackle or any other hoisting parts falling under all of following conditions are fitted to work device such as an arm and a bucket:
- i.) To have sufficient strength corresponding to the load to be burdened.
- ii.) To be unlikely to cause danger of the load falling from the said parts due to the use of a latch, etc.
- iii.) To being unlikely to cause coming off from the work device.
- (ii) In the case where works other than lifting a load is carried out, and when it is unlikely to cause dangers to the workers.
- (i) The case falling under all of followings, in the case where the load lifting work is carried out:
- (3) The employer shall, when carrying out the load lifting work falling under (a) and (b) of item (i) of the preceding paragraph, take the following measures to prevent workers from dangers due to hit by the lifted load, falling of the lifted load and overturning or falling of the vehicle type construction machine:
- (i) To set fixed signals for load lifting work, designate a person who gives the signals and have the said person give the signals.
- (ii) To carry out the work on a level place.
- (iii) Not to allow workers to enter the place where it is liable to cause dangers to workers due to hit by load or falling of the load.
- (iv) Not to apply the load exceeds the maximum load established corresponding to the structure and material of the said vehicle type construction machine.
- (v) To use a wire rope falling under all of following conditions in the case where the wire rope is used as the slinging equipment:
- (a) Those with a safety coefficient (meaning a safety coefficient prescribed by paragraph (2) of Article 213 of the Crane Ordinance) of 6 or more.
- (b) Those with less than 10% of the element wires (excluding filler wires) of which are cut in one strand.
- (c) Those with the reduction ratio of a diameter7 %or less of the normal diameter.
- (d) Those without kink.
- (e) Those without marked deformation or corrosion.
- (vi) To use a suspension chain falling under all of followings in the case where the suspension chain is used as a suspension device:
- (a) Those with a safety coefficient (meaning a safety coefficient prescribed by paragraph (2) of Article 213-2 of the Crane Ordinance) equal to or above the number listed in i.) or ii.) below corresponding to the category of chain listed in i.) or ii.) below:
- i.) Chain falling under all of following conditions: 4
- a) Those with an extension 0.5 % or less when loaded with one half of the breaking load.
- b) Those with tensile strength of 400 N/mm2 or more with extension listed in the right column of the following table or more corresponding to the tensile strength listed in the left column.
Tensile strength (unit: N/mm2) Extension (unit: %) 400 or more and less than 630 20 630 or more and less than 1000 17 More than 1000 15
- ii.) Those not falling under i.): 5
- i.) Chain falling under all of following conditions: 4
- (b) Those with extension of 5 % or more of the length of the said chain when it was manufactured.
- (c) Those with a reduction in section diameter of the links of 10 % or less of the section diameter of said links at the time of manufacture of the said chain.
- (d) Those without crack.
- (a) Those with a safety coefficient (meaning a safety coefficient prescribed by paragraph (2) of Article 213-2 of the Crane Ordinance) equal to or above the number listed in i.) or ii.) below corresponding to the category of chain listed in i.) or ii.) below:
- (vii) In the case where something other than a wire rope or a lifting chain is used as the slinging equipment, to use the one without extreme damage or corrosion.
Article 165 (Repair, etc.)
- (1) The employer shall, when carrying out the work repairing a vehicle type construction machine, or fitting or removing its attachments, designate a person to direct the said work and have the said person take the following measures:
- (i) To decide a work procedure, and direct the work.
- (ii) To monitor the use of a safety prop, a safety block, etc., prescribed by paragraph (1) of the next Article.
Article 166 (Prevention of Dangers Due to Lowering of a Boom, etc.)
- (1) The employer shall, when carrying out the work repairing, checking, etc., under the raised boom or arm, etc., of a vehicle type construction machine, have the worker engaging in the said work use a safety prop, a safety block, etc., in order to prevent workers from dangers due to unexpected descending of the boom or the arm, etc.
- (2) The worker engaging in the work set forth in the preceding paragraph shall use a safety prop, a safety block, etc., set forth in the same paragraph.
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