ᐅ 5-6 cm thick structural concrete wall for exterior use

Hello,

I’m not a structural engineer, but would something like this hold? The neighbor’s gardener is planning a corrosion protection layer about 4–6 cm (1.5–2.5 inches) thick, as shown in the picture.

The top of the wall leans approximately 10–15 cm (4–6 inches) onto my property. On the other side, about 160 cm (63 inches) of wall plus soil has been built up. The wall is around 15 cm (6 inches) thick, and the slope in the soil is about 1 meter (3.3 feet) wide. The green area represents my soil surface. The wall is nearly flush with my turf—or whatever the correct term is. The wall has no foundation. Now, they want to pour a concrete wall around 4–6 cm (1.5–2.5 inches) wide and up to 60 cm (24 inches) deep into the existing wall to support it.

From my point of view, the 60 cm (24 inches) depth plus 5–6 cm (2–2.5 inches) will not hold the angled top upright. If it is built straight up, at some point the wall might crack because the new concrete will not properly bond with the old wall. Am I mistaken in my reasoning?

I had to read this twice but still don’t understand?!

Your terrain is 1.6 m (5.25 ft) high, and your neighbor has installed a retaining block at this level that is tilted toward your property? Now they want to correct this "misalignment" by underpinning it with in-situ concrete? Is that correct?

I can’t fully understand it either. A retaining wall that leans forward is always problematic. Filling the gap with concrete doesn’t solve the issue either. I also don’t see how angle buttresses could lean forward; they should rather be pushed forward. The earth pressure on the lower leg mostly prevents this leg from lifting.

Fixing poor workmanship with poor workmanship..

Concrete without reinforcement holds nothing

bauenmk2020 schrieb:

I had to read it twice, but I still don’t understand?!

You have a 1.6m (5.25 ft) high slope on your property, and the neighbor has installed an angle stone at this level that’s leaning toward your side? Now they want to underpin this “misalignment” with in-situ concrete? Is that correct?

I am the neighbor whose property is the green one and the one affected by the L-shaped angles. I only get partial or very superficial information. From what I understand, the red wall (5-6 cm (2-2.5 inches) thick) is supposed to be placed in front of it, not underneath. If it were done the other way around, you would have to support the angles to prevent them from falling. Whether this is cheaper than installing new angles is very questionable.

WilderSueden schrieb:
I can’t quite understand it either. A retaining wall that leans forward is always problematic. Filling the gap with concrete doesn’t help. I also don’t see how L-shaped retaining walls would lean forward; they would more likely push outward. The earth pressure on the lower stem mostly prevents that stem from lifting.

I completely agree with you, but what can I do as an affected party? I can only insist on a straight wall that won’t collapse and hopefully has been properly constructed. As far as I know, the wall has no foundation and was originally built on what was likely uncompacted fill soil. (pusch)