It depends on how large a hole you want to leave One way is to get the smallest concrete cutting disk you can hire and cut a square piece of concrete with the old anchor in it drill some holes in the side of the newly exposed concrete put pins in them sticking out so that when you refill the hole with new concrete and the new anchors the new concrete can't start moving. Use stainless steel for the pins, they can be bolts or any thing you can find, so long as they don't rust and are reasonably strong.
Yes, the word ladder is a concrete noun, a word for a thing that you can see and touch.
Ladder tray is typically suspended by threaded rod but I have seen it done with aircraft cable. The real problem is how to fasten the threaded rod the the ceiling. Concrete anchors, and Sammy screws are the most common. See related link for more ideas.
Concrete
a swimming injury is a cramp in your leg or if you bang your head on the swimming pool ladder !!!!!!!!!!!!!!!!!!!
Concrete words sit at the bottom of the ladder of abstraction. They are specific, tangible, and easily understood, representing objects or ideas that are physical or can be perceived through the senses. Examples include objects like "table" or actions like "running".
Lower
concrete
at opposite ends of the continuum
Ladder's are very important in a swimming pool. If you don't have a ladder, people can get hurt. If there is an emergency and someone needs help, it would take a while for the person to get help.
Words are compared on the ladder of abstraction based on their level of generality or specificity. At the top of the ladder are abstract terms that encompass a broad range of concepts, while at the bottom are concrete, specific terms that refer to individual instances. Moving up the ladder involves moving from specific terms to more general terms, and vice versa.
It is a tool for analysis of word meanings. Basically, words are placed higher or lower on the conceptual "ladder of abstraction" based on how they represent concrete or physical phenomena. Words that are higher on the ladder are more abstract than those that are lower.
concrete