Table of Content
The plans to rebuild the pool were ready and rebuilding the pool could proceed with the construction of the pool walls. This step was not particularly complicated, but it was much more time-consuming to implement.
Shuttering blocks for the new pool
The side retaining walls that held the steel shell of the old pool should continue to be used. At that time, I had built these walls from concrete formwork blocks. In this process, the hollow concrete formwork blocks are stacked on top of each other in an offset pattern and then filled with liquid concrete. Reinforcement in the walls provides additional stability.
Before I could install the bricks, however, I first had to order them from the building materials dealer. The new wall on the south-west side should be made of 24x25x50 cm stones. The stairs should also be built with 24cm deep stones. This is a good step length. For the pedestal, I decided on a size of 17.5x25x50 cm because it would already have an enormous stability due to the wall behind it and the filling.
On the south side, things got more exciting. In this area I had already built a smaller, 50cm high, wall with 17.5cm deep stones against the lateral retaining wall. In this way, when the original pool was built, a tub was formed under the pool terrace. However, this wall, which was about 3 meters long, was not in alignment with the old retaining wall.
To compensate for this shortcoming and at the same time increase the stability of this free wall, the lower area should be widened with 11.5cm deep formwork blocks. From the 3rd row onwards, the 24cm formwork blocks should be installed.
In total, these were already over 60 large stones plus the 17.5 cm stones and the 11.5 cm stones. Over 50 linear meters of reinforcing steel were also on my order list.
A few days later, the truck came and delivered several pallets of concrete formwork blocks to my driveway and I spent another half day re-stacking the blocks onto pallets in the pool.
- Winkelschleifer mit sehr robustem Gehäuse für den harten Baustelleneinsatz
- Gummiauflagen schützen das Gehäuse
- Mit Sanftanlauf
- Mit Superflansch vormontiert am groÃŸen Winkelschleifer
- Anti-Restart-Funktion verhindert ungewolltes Anlaufen nach Spannungsunterbrechung
The 1st row of stones of the western pool wall is built with formwork stones
The new pool wall was to be flush with the two old retaining walls and form a rectangular pool area on the west side. In the middle of this wall I wanted to build a cross wall up to the old pool edge. The whole thing would look like a “T” from the air and would dissipate the water power well.
So I first placed the 24cm deep concrete blocks in a row and experimented a bit with the placement of the first block. Since the total length did not match the length of the blocks and the wall was to be built in an offset, it made a difference whether I placed the first block on the left or on the right.
The cross stone for the retaining wall to the rear should also be in the middle if possible – without, however, creating too much waste in the formwork blocks. This experimentation cost me a lot of time, but I’m sure it saved me a lot of trouble (and money) down the road.
Install reinforcing steel in the pool wall
After the first row was laid out, it was necessary to prepare for the installation of reinforcement. My plan was to anchor a rebar in the concrete foundation every 50cm. This was exactly the spacing of the openings in the shuttering blocks. After each layer of stones should be installed further probationary periods across. Then, in the last row of stones, 2 rebars were provided to build a stable concrete ring.
I now drilled a 10 hole with my drill in every 2 holes of the first row of stones to a depth of a good 15 to 20cm. For this I used a 1 meter long SDS drill. Thus, the work was relatively convenient to do.
- SDS Bohrer Länge 1 Meter 100 cm für Stein, Beton, Mauerwerk. Bohrer mit SDS Plus Aufnahme Ø 10mm
- Der Steinbohrer zeichnet sich durch eine hohe Standzeit, eine gute Bohrmehl Abtragung und sehr guten Bohrleistung aus
- Lange Bohrungen mit SDS Bohrern benötigen immer eine Führungsbohrung um das Abbrechen des Bohrers an der Maschinen Aufnahme zu vermeiden
- Die Bohrer Spitze ist Hartmetall bestückt
- Gesamtlänge 100 cm | 1 m
After the holes were drilled, I cut the 8mm rebar to a length of about 1.30 meters and inserted the steel into the holes I had just drilled. The reinforcement was then hammered in as far as it would go.
The finished pool walls should be 1.40 meters or 1.50 meters high and one or the other will now ask why does not cut the irons to the appropriate length? Well, the answer is as simple as simple: each brick of the following row must be lifted over the rebar and threaded. At a height of 1.50 meters, this is only possible to a limited extent, because the steel was not always exactly centered in the holes of the stones. The tension was simply too great.
After the irons were plugged in, I cut the iron for the cross brace to length. A further 20cm was added to the left and right as the reinforcing steel was also to be anchored in the two lateral retaining walls.
To do this, I drilled the appropriate holes with the drill and installed the steel. Finally, I twisted the vertical irons with the cross brace. For this purpose, a wire twister or Rödelzange with matching binding wire – so this work is very easy.
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- ✔ STABIL UND NACHHALTIG - die Integration des Stoßabfänger Moduls wirkt verschleißtypischen Effekten beim Drahtwerkzeug entgegen. Die Carbonspindel des Drahtdriller ist mit einer Legierung überzogen und ermöglicht durchweg leichtgängige Anwendung der Drillzange!
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Video of the construction of the pool wall – pool remodeling
I accompanied the conversion of our steel wall pool to a stone pool with the camera and put several videos online. You can also find the video of the construction of the pool walls in my playlist for the project Pool Umbau. But you are also welcome to take a look at my YouTube channel.
The pool wall on the west side is finished stacking
With an offset of half a stone, I then made the 2nd row of formwork blocks stacked flush on top of the 1st row. I used the spirit level to align the stones. So I could be sure that the wall did not get a slope and became absolutely straight.
On top of the 2nd row of bricks there was again a cross brace with reinforcing steel which was also anchored here in the lateral retaining walls. In total, I stacked 5 rows of shuttering blocks on top of each other this way. By the way, no concrete was poured at this stage – that was to happen later.
However, the pipes for the inlet nozzles had to be considered already in the 5 row. However, I have written a separate article on this (and on the installation of LED underwater spotlights and skimmers).
The wall on the west side was to be only 1.40 meters high. With a stone height of 25cm I had to shorten the formwork stones of the 6th row by 10cm. But with the large angle grinder and a sharp diamond blade, it was no problem.
Now the two reinforcing bars on the top row of stones were missing, which I also anchored with the two lateral retaining walls. By the way, I extended the short vertical rebars after the 4 row. For this purpose, additional irons were twisted with the existing irons.
Thus, the pool wall on the west side was finished and only needed to be backfilled.
Build pool wall and pool platform on old retaining wall
The construction of the pool wall on the south side would be much more complicated. At the bottom there were already 2 rows of 17.5 cm deep concrete formwork blocks. However, these 17.5 cm were too thin for me because this wall was completely free to the rear. 24 cm should be at least.
My plan was now to widen the 17.5 cm by facing with the 11.5 cm bricks and then from the 3 row, flush with the inside, to continue building with 24 cm bricks. So I placed the 11.5 cm bricks flush against the old retaining wall in front of the 17.5 cm bricks.
Makita Werkzeug GmbH GA9020RFK3 Winkelschleifer, Blau, Schwarz, Silber, 230 mm im Koffer + 2 Diamantscheiben*Price: € 169.07instead of: € 207.64
At the same time, however, I had to pay attention to the cross wall for the later platform in order to create a bond. The first row of 11.5 cm stones thus went through to the end of the pool and the second row was interrupted by a stone from the platform wall.
The third row of the platform wall should then become flush with the outer edge of the new 24 cm row of bricks. Thus, all walls in this area were built with offsets and connected to each other.
The reinforcing steel I installed in the same way as I had already done on the west wall, of course, added to the stability. Of course, the reinforcing steel of the platform wall and pool outer wall was twisted together here as well.
Since a pool depth of 1.50cm was planned in this area, I did not have to shorten the top row of stones and could install and twist the two rebars directly.
Build stairs and platform in the pool
The construction of the staircase with the formwork blocks and the construction of the landing was done in one step with the construction of the south wall and the east wall behind the landing. All sections were interlocked (opening over opening) and twisted together with the reinforcing steel.
The staircase was also built with the 24cm deep concrete formwork blocks. As already mentioned, this dimension represents an optimal mix of footprint and material use. The stairs were set flush with the pool on the inside and offset.
Moving down, I again anchored the iron reinforcement in the concrete foundation and pulled an additional iron on each step. This crossbar was anchored into the side pool wall, and bent 90° to the landing at the outside edge of the stairs, and then anchored into the wall behind the stairs.
- Lange Lebensdauer: Extrem haltbare Schneide dank Bosch Diamond Technology, einer fortschrittlichen Matrix aus Metall und Diamanten, die extrem scharf bleibt
- Hohe Arbeitsgeschwindigkeit: Anfallendes Material wird effizient durch große Staubschlitze abgesaugt. Der schnelle Abtransport von Staub aus der Arbeitsfläche ist entscheidend für die Geschwindigkeit
- Hohe Belastbarkeit: Extra hohe Diamantsegmente halten noch länger als normale Diamantscheiben. Sie eignen sich besonders zum Schneiden der härtesten und anspruchsvollsten Materialien
- Einsatzgebiete: Die Diamanttrennscheibe eignet sich bestens zum Schneiden von Beton und Mauerwerk
- Kompatibilität: Passend für alle gängigen Winkelschleifer
On the transverse wall from the platform this iron was twisted with the reinforcement from the platform wall. The stability should be more than sufficient.
I used the off-cut of the formwork blocks in the area of the stairs. The entire staircase area, with a volume of a good 2x2x1.4 meters, swallowed up a lot of material.
For the pedestal, I made it easier: the cavity between the front wall in the pool and the outer wall had a depth of 75 cm and a width of just under 2 meters.
For stability, I have installed 2 cross walls between the inner wall and the outer wall here. I filled the remaining space with 0-32 crushed stone and compacted it in layers. At the top, the platform is then covered with a good 20 cm thick concrete layer incl. installed reinforcement closed.
The installation of the skimmer and the LED underwater spotlight was done at the same time and is described in another blog entry about the pool remodeling.