Back to Boston's Big Dig... It appears the concrete ceiling panel fell because: - it was held up by bolts that were held in place by epoxy. - the bolt holes had to be dust-free in order for the epoxy to hold. - it's pretty difficult to remove dust from a construction site. - bolts with built-in epoxy "exploders" were probably too expensive. - alternatives to the concrete panel were explored but (1) they cost the same or more; and (2) there wasn't time to switch construction techniques. - there was great pressure on keeping down costs and completing the... Read more →
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