Retaining wall for the retaining wall!? Do you have any ideas?

I can’t find any pictures now. We also had to dig deeper than the old retaining wall went. The wall was divided into 1.5m sections Dig 1.5 m and concrete, leave 3 m standing, dig 1.5 m and concrete, leave 3 m standing, etc. 1.5 m already concreted, 1.5 m dug out, 1.5 m left standing, etc. 3 m already concreted, 1.5 m dug out, etc. Thus, a small retaining wall was placed in front of the old one.

This was determined by the civil engineer, the architect, and the expert after a brief consultation with the structural engineer and geologist

This was also done with us according to the agreement between the civil engineer and the structural engineer. Unfortunately, I don’t have any photos where you can clearly see it. But if you search for “underpinning,” you can find it; I quickly attached a photo from the internet that shows the principle. As describes, the wall to be secured is divided into individual sections. You dig out the first and third sections, leaving the one in the middle standing. Then the 1st and 3rd sections are concreted (or built up, depending) up to the existing wall. When this has cured, the section left standing is dug out, and so on.

The L stones are at least frost-free founded. So about 80 cm deep below ground level. I suspect the support of the L stone protrudes into the neighboring property. If you want to go one meter deeper, you must also underpin the foundations of the retaining wall by 1 m. This can be done step by step as already mentioned. What do you think is the reason the earthworker initially said only up to this point and not further. That will be a substantial additional cost. If you want to execute it like that, then I can only advise you to do it before the house construction. Otherwise, it will become even more expensive. Show us your planning. Where is the driveway, why is the CP in that corner? It can't get any more expensive?

Get the planning for the neighbor's retaining wall. With the L stones, underpinning may not be so easily possible.

That will be a hefty additional cost. If you want to carry it out that way, I can only advise you to do it before the house construction. Otherwise it will become even more expensive.

I can confirm both. Deal with it thoroughly now and have it done first thing!

Beforehand, definitely consult a structural engineer for the planning of the underpinning. The attached image is very optimistic. Normally, the sections are only 1.25 m long. Search for BGBau foundations next to footings underpinning.

Thank you for your explanation, I think I understand it now. And I feel quite differently... We don’t have a price yet for the right wall behind the carport, but it would have to be done exactly the same way there... It sounded so easy on the construction site...

Let’s continue on the L-stone side on the left, now we have a solution for the wall. But how do you see it with the roots, if we mill them off, they will eventually die. Could it really happen that the L-stones don’t tip forward, but rather sink downward, right?


I have to/want to obscure the site plan a bit first, I will deliver it later...

There are no documents for the existing retaining wall, we have already inquired, it was built there before the current owners.