Seed Home 2 Foundation: Difference between revisions
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=Tools= | =Tools= | ||
*Soil penetrometer $56 to measure compressive strength of soil - [https://www.amazon.com/AMS-59032-E-280-Pocket-Penetrometer/dp/B0787W612K/ref=as_li_ss_tl?dchild=1&keywords=Soil+Penetrometer&qid=1593552415&sr=8-2&linkCode=sl1&tag=concretenetwork-20&linkId=5d3894e2bcfbc93a83fd7f78628d3b1b&language=en_US] | *Soil penetrometer $56 to measure compressive strength of soil - [https://www.amazon.com/AMS-59032-E-280-Pocket-Penetrometer/dp/B0787W612K/ref=as_li_ss_tl?dchild=1&keywords=Soil+Penetrometer&qid=1593552415&sr=8-2&linkCode=sl1&tag=concretenetwork-20&linkId=5d3894e2bcfbc93a83fd7f78628d3b1b&language=en_US] | ||
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*[[Helical Pier Foundation]] | |||
Revision as of 02:43, 13 September 2020
Calculations
- See Seed_Home_v2_Calculations#Foundation
- Calculator - see Deck Load Calculator
Soil Properties
- What is a typical soil load capcity? [1]
- 2000 PSF for clay, 12k PSF for bedrock. Just use a penetrometer.
- Presumptive Loads - Utah Code - 1500 psf for clay - [2]
Helical Pier Properties
Basics for calculation:
- Size of helix can vary - 6-14"
- Number of helices can vary to increase total bearing area. 1-3 helices per section
- Pier shaft can vary - more load capacity. Hollow pier profiles can stand more lateral loads per weight of steel pier.
- Screw force - force limit at a given radius = load bearing capacity, in the limit that we have not stripped out the soil (using a screw thread analogy)
Logic
When examining soil load bearing strength - is a Soil Penetrometer like this sufficient to get a good idea for the Building Package or engineering stamp? Who checks the soil bearing value in the process? I am assuming that if you select the minimum presumptive value (1500 psf), then they accept this value without contest?
Tools
- Soil penetrometer $56 to measure compressive strength of soil - [3]