Here's the situation. Have trapeze mount a transformer in an electrical room where conduits, duct, panels are already installed. When I was in the electrical closet there's about 7' from the conduits to the slab above. It's very congested. How would you drill the slab if you could only get the drill to about 7' away from the slab? not a 7' bit...lol..without removing the conduits? Thanks
how heavy a transformer? 112kva?
slab post tension?
robertson decking?
structural steel you can hang off of?
seismic support?
and a design with a structural engineers wet ink signature on it?
i've shot strut to the deck with a couple 10' long pieces of
solid back strut, with a hilti gun with a strut nose on it.
use 3/8" pins. lots of them. then drop rod from the strut, and hang
the xfmr.
there is almost always a place where i can wiggle thru a layer
of conduit. work some 6' pieces of 2x12 planking up thru the
layer, and stand on them. the concrete should be an easy reach.
if the floor above isn't finished, lay out where you want the rods
dropped,and drill a 1/2" hole all the way thru, blowing out the
floor.
then go up on top and counterbore the holes with a 1 1/2' bit.
go down 3". put a rod coupling and three 1/2" x 1 1/2" washers
on 10' of running thread, and drop them down in the counterbored holes.
fill the holes up with hilti structural grout.