Quote:
Originally Posted by jollyburger
Do the forces at play on the top set of bracing bars go down as they build up the foundation?
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No, not really. Each supports the load above and beside it: above only to the level where the load ends (the top one) or where the brace above takes over. Think of it simply as a reverse of their installation. They dug down a level, installed a brace to support the exposed load, and repeated.