I've been lurking around this site for a couple of years now, finally getting around to rebuilding the pool that came with the house we bought 3 years ago. The original pool is an inground 16x32, when we moved in there was no liner, walls were out of alignment and the hopper walls had cracked and were partly collapsed. I knew it was going to be a new pool project, wasn't much to be saved except the walls themselves.
So... started digging and found that they did pour a concrete collar... I've been breaking concrete now for a few weeks in my evenings and weekends. They also poured a 4" thick concrete slab at the bottom of the hopper and in the shallow end. They had 2-6" of vermiculite and cement over top of the concrete slabs.
I bought some additional walls from a person who had taken their pool out, my plan is now to make this an 18'x40' with an 8'6" deep end. Original deep end was a little under 8' with a very steep slope from shallow to deep end.
Ground is clay with lots of water seeping, and the deep end will slowly fill with water to the top of the hopper... not sure if it's all groundwater, but there is lots of groundwater. I know that the clay and water are a big problem, so I've dug a sump and drained the hopper bottom into the sump. That's about where I'm at right now... about half of the walls are now removed and de-collared. Still working on the remainder of the walls now... well, it's good exercise at least.
I do have one question that I haven't quite solved yet... one of the hopper walls was overdug because of a big rock that was protruding. And we also dug a channel through the hopper wall on the opposite side to install a sump. The sump is definitely necessary in my conditions with clay, water and a 4' deep frost penetration in the winter months. My question is, how do I repair those overdug areas on the hopper walls before setting the new steel walls in place?
Here are some pics...
Hand digging the walls.... it was backfilled with sand, so it was relatively easy to dig out. No room for an excavator, fence on one side and garage on the other. Pics are not in order.