The liability of companies for personal injury due to negligence

I have been injured as a result of two companies' negligent actions.

I tripped over a black pipe that was laid out in an area where the lighting was broken. The company which laid the pipe did not put up adequate barricading which would have highlighted the trip hazard.

I was tripped over it in darkness, knocked out for 10 minutes, had a head injury, ended up in emergency and still have an injured shoulder and blurry vision in one eye.

What actions can and should be taken? Both of these companies need to be held accountable for their negligence and for the injuries, pain, and suffering.