Take notice in any work on the site construction

Any accident anticipated in this frame? 

A hydraulic excavator is traveling in a sewage treatment plant. Because of the soft ground, steel planks with the size of 1.5 m in width x 6 m in length and 1.6 ton in weight each are used to support the weight of the machine. It has reached the end of the planks and is about to make a right turn. Then a worker steps on one of the planks to cross the ground.

Now what accident do you anticipate from this picture?

This is the accident resulted!

The hydraulic excavator made a pivotal turn to the right, when a broken part of the track shoe assembly hooked the floating edge of the steel plank on which the worker stood. Now that the machine was moving rearward, it further pulled up the plank, tossing him off. He was then prostrated under the heavy plank and crushed.

Tips for forestalling similar accidents

1. Check at a pre-operation inspection or a periodic voluntary inspection if there is any broken part on an undercarriage. If any, take necessary actions for the repair.
2. Level the ground before placing steel planks to assure they are set as evenly as possible.
3. Provide a separate passage for pedestrians and machines. If that is impractical due to the limited space, post a traffic controller in such a spot, who regulates the traffic, showing a priority.