Boy, I'm at a loss. I think
Gaff might be right, it sort of sounds like a custom job, or I'm just not visualizing it properly. I would like to interject, if I may, and you may already know this, if these pies are going to be load bearing in any way you can't simply anchor them to a
CMU wall. You have to use a spacer. Allow me to explain, for the edification of those not wise in te way of
CMU < cinder blocks > <
CMU stands for Concrete Masonry
Unit> There are a couple of ways a
CMU wall can be constructed. The first and fastest is simply stacking them. You run
rebar down them every once in a awhile ad motar them together, this is a pretty common construction technique. the second way is to do t the fast way then every once in a while fill the
block with concrete. If your wall is a hollow
CMU construction and you put anchors into it then put any type of torsional stress on the flange the
block will fail and the achors will rip right through it. The way a structural engineer will tell you to do it would be as follows. Let's say you are using 1/2" bolts get a piece of 3/4" scd#40 pipe drill your holes in the
CMU using a 1" masonry
bit. You must drill all tthe way through to the outside of the wall. Insert the pipes into the holes. Oh they need to be cut to about a 1/16th longer than the
CMU is thick ie f its a 9"
cmu block than cut your pipes to 9 1/16th inches. you may want to use some chaulk to hold them in place and to seal them against moisture intrusion s the outside of the
block is and exterior
face. At the least you will need another plate on the outside of the wall with the same or larger dimensions as the interior plate. Now place the bolts, with the heads on the outside of the wall. Install your interior plate / flange your washers, nuts and torque them down. When you properly torque the bolts the pipe spacers should squish enough that the plate will be tight to the wall.
Important tips:
Either, use some construction
epoxy on the
bolt heads to secure them to the outside plate prior to installing the nuts and interior flange, OR get a buddy and a walkie talkie. Yes I spent a week on an install job outside in the rain holding a wrench.
This is not just me being a nervous ninny this is the technicque which I have had to use on serveral occasions when installing new pipe grids into theatres. I know it a lot of work but beleive me it much better than someone getting killed from a failure of the
CMU.
Sorry for the long windedness and I apologize if you already know this. I thought it would be important for others to read. I kind of feel this is sort of bordering on the topic of rigging < or maybe just my post is > If so Dave feel free to delete it.