This is the second access cover of this type I've seen broken near this location in a couple of months. This one seemed to fracture along the grid lines to some degree. I had an idea that the existing stock of these might be made considerably stronger if a disk of fiber mesh material were applied to the upper surface and then saturated with epoxy resin and non skid grit for a finish. That would fill in the grid lines in effect making the whole structure thicker and I'm guessing quite a bit stronger. Something that might be easily done a little at a time by a small crew with a truck carrying a kit designed for the purpose. Even if the covers did fracture the mesh might hold them together well enough to prevent this kind of hazard from occurring. I suggest using good ventilation and all environmental precautions when working with epoxy folks.
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