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  • Users: PEinc
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  1. PEinc

    Two sided Soldier Pile Lagging Wall

    In your first stage, when you install the wood lagging, block it (with short, cut off pieces of lagging) snuggly to the rear flanges of the soldier beams. Note that this can reduce the lateral support of the soldier beam and adversely affect the allowable bending stress of the beams. When you...
  2. PEinc

    Drilled Pier Frost Heave

    ChiEngr, I assume that the drilled pier would be embedded much deeper than the 3.5 foot frost depth. Therefore, the pier's surface area below the frost depth should be several times greater than the surface area within the frost depth. The embedment length below the frost depth could have an...
  3. PEinc

    Grouting top course of CMU wall with

    I don't see any way of "drypacking" the top course of blocks. There is not any room to ram a damp sand/cement (drypack) mixture inside the top blocks. Why not just fill with grout?
  4. PEinc

    Gravity Wall Design Question

    Yes, if you use the Coulomb equations without wall friction.
  5. PEinc

    Gravity Wall Design Question

    Coulomb earth pressure coefficients can also address any sloping behind and in front of the wall. Rankine cannot.
  6. PEinc

    Underpinning in sand

    Sketches of new and proposed construction would be helpful.
  7. PEinc

    Interesting Footing retrofitting situation - Extending Existing retaining wall pier foundation under earth

    There may be more to this problem than was indicated. How does the wall retain 20 feet of soil with only the small wall footing shown in Section 2-2? How many column footings need to be made larger? What is the column spacing?
  8. PEinc

    Micropile Grout Compressive Strength

    Most inconsistent grout strength issues I see are with the sampling, varying mold sizes and shapes, storage on site, transportation, and test specimen prep. When I have low grout tests, I check the micropile design for the lower strength. Often I design for a lower grout strength but still...
  9. PEinc

    Sheet pile wall design with soil springs

    Looking at this briefly, I would look at Model A and consider sheet piling with toe pins drilled into bedrock or a combi-wall of beams drilled into rock with sheets driven to rock. The toe pins or drilled-in combi-wall beams would provide passive resistance.
  10. PEinc

    Frost line consideration for walkout basement

    A different problem: Will there be a floor drain at the bottom of the steps to prevent water from running into the basement? www.PeirceEngineering.com
  11. PEinc

    Sheet pile wall design with soil springs

    I would be interested in seeing a typical soil boring and the geotech report's recommended soil properties. What is the height of retained soil? Where is groundwater? Any surcharge loads behind the wall? Are you applying safety factor(s) to the soil properties or to the calculated embedment...
  12. PEinc

    How to make this wall work with the cramped space?

    Not enough information given. WARNING: 8.5' excavation with an adjacent structure! Existing structure? Existing footing depth? Underpinning required? www.PeirceEngineering.com
  13. PEinc

    Earth Pressure

    https://www.google.com/search?q=at-rest+earth+pressure+coefficient+for+normally+consolidated+clay&rlz=1C1GCEA_enUS1023US1023&oq=at-rest+earth+pressure+coefficient+for+normally+consolidated+clay&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCjMwNzY0ajBqMTWoAgiwAgE&sourceid=chrome&ie=UTF-8...
  14. PEinc

    Strut Preloading Lock Off Load

    I have no idea what that means. www.PeirceEngineering.com
  15. PEinc

    Strut Preloading Lock Off Load

    Rarely have I ever had to pre-load internal braces. However, see attached PDF. www.PeirceEngineering.comhttps://files.engineering.com/getfile.aspx?folder=662eaf5f-d181-4d68-bca4-616074c26fb7&file=FHWA_Brace_Preloading.pdf
  16. PEinc

    Cost estimating software recommendation.

    HCSS...
  17. PEinc

    Micropile Design - LRFD Factors

    JohnnyB, can you ask the structural engineer for unfactored service loads instead of factored loads. You will need service loads if you need to calculate settlement. This is for a building, not a highway. IBC has a different ASD formula than AASHTO/FHWA. Look for a download of FHWA-SA-97-070...
  18. PEinc

    Underpinning Rubble Foundation

    Geoluk, underpinning should not be done in multiple lifts (i.e., underpinning the underpinning). Underpinning in multiple lifts compounds the possibility of problems and settlement ( 2 lifts, double risk, 3 lifts, triple risk, etc.). Underpinning should be performed using hand excavation, not a...
  19. PEinc

    How to retain sheet piles

    Seems to me you need a written agreement from the neighbor stating the maximum future depth of any dredging. Then design your wall for that depth or maybe even deeper. www.PeirceEngineering.com
  20. PEinc

    Underpinning Rubble Foundation

    I would not consider that a rubble stone wall. What is the condition of the brick wall that is sitting on the single layer of big stones? How thick is the concrete on top of the stones? I have had a couple of projects where the rubble stone wall was in such bad shape, we removed it in sections...

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