Concrete slab question
 

I have a slab question attached to this picture that I hope will be clear for any to read and comment on. I want to understand this process with a concrete slab. The fact that it is a cable slab has no bearing on the question.
Thank you for any assistance in helping me understand this.
houdinihar

They are removed after the slab is floated. They can be flimsy because they hold back a neligible amount of weight because of the way you pour a blocked-out slab.

thanks for reply Tscarborough