The pool is rectangular, approximately 15' x 30', and is attached to the back of a home that is at ground level in the front and one story above ground level in the rear. Hence, one walks directly out to the pool, which is set behind a one-story retaining wall. The long side of the pool is parallel to the house, but the back pool deck is a trapezoid, so the long dimension on the pool's side away from the house does not run parallel to the retaining wall. At one end of the pool, the retaining wall is approximately 3' from the pool edge and corner and at the other end of the pool, the retaining wall is about 5' from the pool edge and corner.
The pool is surrounded by concrete decking covered in Saltillo tile. I assume the decking is tied to the pool shell via the extended rebar from the pool, as I am told is common, but, as i didn't build the pool, I cannot verify this without frther detective work.
At the corner of the pool (and there's one problem, it has a 90-degree corner, not a round corner) at the end 3' from the retaining wall, a crack has occured which runs roughly from the top corner at a 30-degree angle downward and along the back wall of the pool. Part of this crack is above the water line and part below. The crack is about 1/8-1/4" and extends about 4' in length.
What I think might be going on (just a guess) is that the expansion/contraction at the end where the deck is narrow and the retaining wall nearby is such that it is causing the crack and loosening tiles off the coping. The retaining wall does not appear be moving, so i don't think that's the issue.
Now, I want to stabilize this deck/pool shell interface before making further repairs. I wan to solicit solutions from experts, but had the following idea, which is open to comment. I was wondering if I could drill down about 24" through the decking at, say, 16" intervals laterally, into the center of the pool shell and epoxy rebar into these holes to further strengthen the decking-pool shell interface. Is this a sensible idea? Others? (It would be helpful if the repairs can be effected without destroying all the Saltillo decking, if possible.)
Also, I see an interesting new product, Torque-Lock (http://www.askalanaquestion.com/torque-lock.htm ), which looks like it might have application. Does anybody has experience or comments?
Any and all assistance much appreciated. If anybody needs photos to better appreciate the layout and design, I'd be happy to e-mail.
Thanks in advance.