Part 3. Cases Involving Construction Vehicles (concrete pump truck)

What kind of accident is about to happen?

Workers are leveling out the pavement while concrete is being poured into a second-story floor with a concrete pump truck. Can you predict what's about to happen?

Look what happened!

The boom of the concrete pump truck broke, causing the arm to fall on a worker.

Tips for preventing similar accidents

1. During the pre-work inspection, ensure that there are no cracks in the boom mechanisms.
2. Special and periodical voluntary inspections should include inspections for cracks in boom mechanisms. If there is a concern that the machine may be cracked, perform an inspection using a flaw detector.
3. If an abnormality is detected, immediately conduct repairs or take other necessary measures.
4. Observe all stability, maximum load, and boom tip hose length specifications established for the specific model of pump vehicle being used.
5. When a boom is being used, restrict workers from walking beneath it.
   

Soure By The Japan International Center for Occupational Safety and Health (JICOSH)

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Part 2. Cases Involving Construction Vehicles (tunnel construction site)

What kind of accident is about to happen?

A wire is attached to the hook of a drag shovel with a crane attachment, and is being used to move a steel arch support at a tunnel construction site. Can you predict what's about to happen?

Look what happened!

The shovel operator stopped the shovel suddenly since a worker walked under the overhead load. As a result, the wire rope came off of the hook and the support beam fell on the worker.

Tips for preventing similar accidents

1. Never let a worker walk under overhead loads.
2. Be sure to inspect the safety catch for the hook before starting work.
3. Assign someone to serve as a signaler and perform work in accordance with that person's instructions.
4. Know the proper methods of hanging support beams, and the order in which beams are to be installed.

Soure By The Japan International Center for Occupational Safety and Health (JICOSH)

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Cases Involving Construction Vehicles (Vibrohammer)

What kind of accident is about to happen?

While extracting steel sheet piles, a worker connects the chuck portion of the Vibrohammer to the steel pile, and starts the machine. Can you predict what's about to happen?

Look what happened !!!

Because the worker turned on the Vibrohammer without securing the hydraulic chuck, the Vibrohammer started shuddering, came off its hook, and fell onto the worker.

Tips for preventing similar accidents

1. Only start a Vibrohammer after securing the chuck and ensuring that it is being firmly pinched.
2. Be sure to inspect the safety catch for the hook before starting work.
3. Only allow personnel certified to operate a vehicle-type construction machine for foundation work to perform pile extraction work.
   
4. Undergo preliminary training on the proper methods for operating machinery, such as methods of starting up a Vibrohammer from a remote location.

Soucre By The Japan International Center for Occupational Safety and Health (JICOSH)

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