Thanks for all the input and the questions. I will try to define the project a little better. The "hole" was carved out of the ground (very stable, rocky, hard soil) and 5 foot stone walls (1 ft +/- stones cemented together) were erected around the hole so that it would hold wooden beams...
Anyone care to offer some words of wisdom on the following:
As part of a slab to be poured for the floor of a small house, it will be necessary to bridge across the top of a "cellar" in the middle of the house. This hole is about 12 feet wide by 30 feet long. Would precast beams and blocks be a...
