jazzman wrote:Looks to me as if you only have one layer of rebar on the floor. But it may be the photo. How many ground beams did you put in?
Hi Jazzman,
The pool is built on very established and hard packed land (the level was raised above the adjacent rice paddies over 14 years ago). The sub-base of the pool (total slab size 12mx8M) is a 15cm concrete slab re-inforced with 3.8mm x20cmx20cm wire mesh poured onto a compacted and sand covered flat area with a 30cmx15cm perimeter ring beam which is below the surface level, and reinforced with 4 runs of 12mm rebar. The sub base is needed to establish a level surface on which to construct the outer blockwork form for the pool, constructed from 10cm thick 40cmx20cm concrete blocks, backfilled with concrete and every one tied together with 6mm steel.
- Land ready for cpac sub base pour
In addition, we cast another ring beam 20cm x10cm, reinforced with 2 runs of 12mm rebar after laying the 4th row of blocks, and then topped this with another 3 rows to get the coorect pool height. This was to ensure the outer wall could support the later pouring of the 20cm thick concrete pool walls without bowing or cracking.
- Casting the upper wall beam
After the blockwork was completed, the pool steel re-inforcement was laid in. The floor is a single layer of 12mm rebar laid every 15cm in both directions and supported so that it sits in the middle of the later 20cm thick 280steng, waterproof cpac concrete that was poured in. The total floor thickness is therefore 35cm of 280 steng cpac concrete.
The walls are the same single row of 12mm rebar with the top row being 16mm rebar, spaced 15cm apart, except for the waterfall wall which has 2 rows of 12mm rebar for additional strength, and a 25cm thick concrete wall.
- Pool blockwork completed. Laying on 1.5m concrete walkway planks for pool
- Pool blockwork completed. Laying on 1.5m concrete walkway planks for pool
- Laying in the 12mm rebar
- Steelwork finished and ready fo 20cm concrete base pour
- Cpac trucks ready for base pour with 280steng WP concrete
This construction method is very strong, has been used in the construction of hundreds of pools in Phuket, and was also approved by our local architect and structural engineer, after he originally viewed my proposed construction drawings.
Hope some of these photo's help clarify more!