Thank you for this post as I have spent many hours grinding materials and what not to make my reinforced concrete trench which completely collapsed all the way around for no reason! I lost nearly 400 rebar frames and 4000 wood to upgrade them. Some concrete was lost, but I am not to worried about that.
Sorry for the outburst on chat. I was having a rough day at work and was daydreaming all day about coming home and working on my project, only to log in and have it collapse for no appearant reason...I sorta lost my temper a bit
McCragge