ᐅ Cistern placed directly next to the construction access road – risk of damage?
Created on: 30 Oct 2020 09:50
T
Tolentino
Hello dear forum members,
the demolition has now been carried out at my construction site (https://www.hausbau-forum.de/threads/lage-stadtvilla-oder-efh-auf-500-m2-rechteck.33505/post-442751).
In addition, a temporary access road for construction vehicles has been established, which unfortunately ends directly at an (empty) (PE) cistern (https://www.hausbau-forum.de/threads/lage-stadtvilla-oder-efh-auf-500-m2-rechteck.33505/post-442845).
My neighbor and co-builder (but with his own house located at the rear of the overall property) is now concerned that the cistern could be damaged if a 40-ton truck drives all the way down the access road. The load is said to be distributed at a 45° angle downward, according to our site manager’s explanation. This would mean that part of the cistern would definitely be subjected to some of the load. There is maybe about 1 meter (3 feet) of soil between the access road and the cistern. The cistern measures approximately 2 x 1.5 x 1 meter (6.6 x 4.9 x 3.3 feet) and is installed vertically, with its longest side buried underground.
Is his concern justified? Would it be enough, for example, to simply fill the cistern? Or would it be better to dig it up and relocate it? Here, I am worried that the access road at the back might then become unstable, even if we refill the hole. We probably won’t be able to compact it properly (the neighbor wants everything done with excavation and loading, EL).
Does anyone here have experience in civil or geotechnical engineering, or could even calculate this? What data would be needed for that?
the demolition has now been carried out at my construction site (https://www.hausbau-forum.de/threads/lage-stadtvilla-oder-efh-auf-500-m2-rechteck.33505/post-442751).
In addition, a temporary access road for construction vehicles has been established, which unfortunately ends directly at an (empty) (PE) cistern (https://www.hausbau-forum.de/threads/lage-stadtvilla-oder-efh-auf-500-m2-rechteck.33505/post-442845).
My neighbor and co-builder (but with his own house located at the rear of the overall property) is now concerned that the cistern could be damaged if a 40-ton truck drives all the way down the access road. The load is said to be distributed at a 45° angle downward, according to our site manager’s explanation. This would mean that part of the cistern would definitely be subjected to some of the load. There is maybe about 1 meter (3 feet) of soil between the access road and the cistern. The cistern measures approximately 2 x 1.5 x 1 meter (6.6 x 4.9 x 3.3 feet) and is installed vertically, with its longest side buried underground.
Is his concern justified? Would it be enough, for example, to simply fill the cistern? Or would it be better to dig it up and relocate it? Here, I am worried that the access road at the back might then become unstable, even if we refill the hole. We probably won’t be able to compact it properly (the neighbor wants everything done with excavation and loading, EL).
Does anyone here have experience in civil or geotechnical engineering, or could even calculate this? What data would be needed for that?
If the cistern is no longer going to be used in that location, it should be removed now.
If the cistern is still watertight and will be used in the future, I would
1. Inform the site manager
2. Cord off the area plus 1 meter (3 feet) around it with warning tape
3. Put up a sign saying, “Caution cistern — do not place any loads here.”
Because during the construction phase, deliveries are constantly made and items are placed wherever there is free space, and every crane and truck with a unloading crane has outriggers.
If the cistern is still watertight and will be used in the future, I would
1. Inform the site manager
2. Cord off the area plus 1 meter (3 feet) around it with warning tape
3. Put up a sign saying, “Caution cistern — do not place any loads here.”
Because during the construction phase, deliveries are constantly made and items are placed wherever there is free space, and every crane and truck with a unloading crane has outriggers.
1. The cistern could basically remain there.
2. & 3. Of course, we would take care of that (the site manager is aware of the cistern and, strangely, hasn’t said anything yet, but I will ask him directly again). The question now is whether the cistern could be damaged simply because a truck is parked on the construction access road (as mentioned, 1m (3 feet) away from the cistern), due to the pressure transmitted through the soil, i.e., from an angled top side.
2. & 3. Of course, we would take care of that (the site manager is aware of the cistern and, strangely, hasn’t said anything yet, but I will ask him directly again). The question now is whether the cistern could be damaged simply because a truck is parked on the construction access road (as mentioned, 1m (3 feet) away from the cistern), due to the pressure transmitted through the soil, i.e., from an angled top side.
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