To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. In order to do some drain relocation I have cut open several big holes in my concrete slab.
I have done this in several bathrooms and the holes vary in sizes, the larges one 4'x7' and the smallest one 2'x5'.
After the drain relocation was done I put the sand back in, compacted it and used a garden hose to soak the soil, let dry, recompacted and soaked with water again.
The other says nonsense, drilling large diameters into existing concrete will more than likely crack that concrete and create another distress line, that I should just pour new concrete and level it with the existing concrete.
Then the first one says he would order concrete delivered by a truck and that way the concrete is very consistent and strong.
The other one says concrete from a truck vs hand mix are the same strength, that he prefers hand mix because they could set their pace and work on one bathroom at a time. If the holes have jagged sides or edges, no rebar will be needed because the shape alone will keep it from settling.
This makes rebar difficult because I don't think the concrete block wall that are hollow is a good candidate to insert rebars into, right? To make matter more complicated, I want the entire area that is opened now to be a shower without a raised curb at the edge., in other words, the new concrete slab will need to be lowered by two inches or so, such that when I build up a slope and shower pan later the edge of that shower will be flushed with the rest of the bathroom floor. But that will not stop the new concrete from settling, and still the other three walls are issues right?
But how do I put rebars into concrete hollow block walls when three sides of this are walls that goes deep and rest on footings?
In this case, the rebar is only to keep the concrete from settling, so it doesn't need to overlap, nor do you need wire mesh.
When it comes to plumbing retrofits in basements, the concrete jobs you have talked about are happening all the time.
Pour the concrete flush with existing edge and trowel soon to get course stuff settled in the freshly poured concrete while you can and keep seem clean & distinct.

I would pour the shower base flat for now with a larger form around the stubbed out drian pipe. I wet and compacted the sandy soil, then I sprayed the opening area with a 10 year termicide.
If you use plywood, make certain to cut all 4 pieces the same length and stagger each corner.
Band wheel shaft with 26-inch diameter flanges near one end and the crank on the other end. This hook and ring are embedded solidly in the side of the road at the site of PCO 27, the closest well. This small section of 2-inch pipe is probably almost all that remains of the original pipeline out of the canyon, which was laid in 1879 to the refinery in Newhall. Evidently, the 2-inch pipeline was also used to carry water, using a pump, to the canyon until the end of 1881, when a new 4 mile long pipeline was laid for water from the Santa Clara River northwest of Pico Canyon. Also on the road just after Johnson Park I came across this about 8 inch California Whiptail lizard with its attention on something in the brush. In April of 2011, I came across another alligator lizard sunning itself in the road at almost the same spot as the above lizard was 2 years ago when I took those photos. There were wells drilled outside the CSO Hill and PCO Hill areas and these photos are from those areas. This well was drilled in 1909 and there is virtually nothing left except an old dried out petroleum spill in the open area. After taking pictures, I re-buried the pulley and band wheel shaft to about the way they were when I found them.
Lyman Stewart was a very religious man and was not fond of profanity from his drillers, hence the area they were drilling in DeWitt became known as "Christian Hill". Suddenly an alligator lizard came out of the brush where the snake was and actually sauntered right between by boots and onto the road, where I took its picture.
The snake (probably a California Stripped Racer) had part of the lizard's tail in its mouth.

The butt ends of the shaft were mortised so that the wings could be inserted leaving the cylindrical parts of the gudgeon projecting from each end of the shaft. There is hardened petroleum on the inside bottom showing that oil once flowed through this pipe. The larger pipe was, and still is, used for water, but whether it was the original water pipe is hard to tell. Note that there is no hardened petroleum on the inside bottom of the pipe as there is on the smaller pipe.
On this hill just east of PCO Hill in Pico Canyon, the company obtained a lease and, between 1882 and 1884, drilled two wells - Hill 1 and Hill 2. It wasn't going as fast as I thought it should be, but it made a beeline to the other side of the road. It was filled with all of Pico's production and, with an agreement from Union Oil, most of their oil (White, 1962). This pipe was only used to transport water and was probably connected to a water tank located on the first flat area past the hairpin curve (the staircase for the tank is still at the flat area).
Seeing as how my office tends toward the conservative side, I would do the rebar if it were mine; that way I would know for sure it would not move. The only other thing I'll say is that the cardboard box will not hold it's shape when the concrete is placed against it. In fact, this hill is also sometimes called Christian Hill, but how could the wells have been named for the hill before the hill got the name? Hill 2 is on about the same level as Hill 1, but around the hill out of site of this photo.

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