Building ground - alternative to pile foundation?

  • Erstellt am 2019-12-03 14:28:53

lisaa11

2019-12-03 14:28:53
  • #1
It concerns a new construction in a gap between buildings; the surrounding neighborhood consists of 1970s houses with basements, none of which had pile foundations or similar. Now the soil expert of the house building company (developer) has completed his assignment and presents the following results.

According to the soil report:
During the soil investigation, between 0.90 - 2.80 m below ground level (GOK), a highly organic layer of floodplain clay and mud with very low load-bearing capacity was encountered. Due to these settlement-sensitive soils, additional measures (such as pile foundations with drilled piles or deep foundations using concrete shaft rings) are required for the foundation.

Groundwater / stratified water: Water level at: 2.70 - 2.80 m below GOK, measured after drilling ended at: 1.60 - 1.70 m below GOK (confined), stratified water in sandy and gravelly areas possible depending on precipitation development.
Groundwater level: 0.40 m below GOK [-0.78 m rel.]
Perched water: After heavy rainfall events, complete pore water saturation (water saturation in the soil pore space) up to ground level (GOK) possible (puddle formation).

Soil profile:

1. up to 0.30 m below GOK Topsoil sand, silty - weakly silty, slightly humic
Consistency / structure: loose, partly medium dense Color: dark brown - brown grey - dark grey - brown

2. up to 0.90 - 1.00 m below GOK Cover sediments sand, strongly silty - silty

3. up to 2.70 - 2.80 m below GOK Floodplain clay/mud silt, sandy - weakly sandy, weakly clayey, organic -
General characteristics: layers 2 and 3 highly organic (decomposed wood and plant remains, musty odor)

4. up to 5.00 m below GOK Fluviatile sediments sand, weakly silty, weakly gravelly, in KRB 1 from 4.60
General characteristics: m: sand, strongly silty

Question: Pile foundation would not only be expensive for us but also much more complex due to pressure probing (15 m to 20 m), aerial photo verification of absence of utilities and unexploded ordnance, preservation of evidence, etc. Is there an alternative solution here?

Thank you very much in advance!
 

michert

2019-12-03 15:17:25
  • #2
What type of building structure was the basis of the assessment? A house with or without a basement?
 

Lumpi_LE

2019-12-03 15:24:19
  • #3
You probably don't have a load-bearing beam, otherwise you wouldn't care how it's founded and what it costs. You even write yourself, they all have a basement that is founded below the muck. Or build a wooden house, that weighs nothing..
 

lisaa11

2019-12-03 16:38:33
  • #4
It is planned without a basement. A WU basement here costs about €60,000, which is also not economically feasible.
 

michert

2019-12-03 16:53:03
  • #5
I believe a house without a basement is not economical in your case.
 

11ant

2019-12-03 17:34:25
  • #6

How did they found their houses (with basements) instead—assuming your property is not the only one located over a vein of unfavorable soil conditions?


Even truths are changeable; the energy saving ordinance has not left formerly lighter construction methods unaffected.
 

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