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  • Users: Jrit
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  1. Jrit

    How to fix this?

    Maybe I'm missing something, but are you sure they used the specified beam?
  2. Jrit

    Masonry Cleanouts

    We had a project several years ago that had a CMU issue. They performed an infrared scan with a ThermaCAM T420, and it perfectly showed which cells were grouted. Not sure of cost or who paid.
  3. Jrit

    Repair for Segmental Retaining Wall Undermined at Base Course

    Are those base blocks trimmed at the bottom? Are they set on an aggregate base, or possibly concrete? To me, easiest fix is to replace the leveling course and embed the wall 6 or 8 inches by adding compacted soil in front. Monitor over time and replace soil as needed. You could armor the added...
  4. Jrit

    Starting Side Gigs

    Make friends with some local Civils. We get a lot of referrals from them.
  5. Jrit

    Wide format plotter recommendations?

    We've had good luck with an HP T630 purchased 4 or 5 years ago, and its predecessor was also an HP that lasted a decent amount of time. They are 24 inch models though.
  6. Jrit

    Residential Segmental Retaining Wall

    One note to add, segmental walls aren't designed for a bearing pressure. The wall design will give you the applied bearing pressure. The width of the retained zone typically yields a bearing capacity with a large FOS (and much larger than what is typically seen for a strip or column footing)...
  7. Jrit

    Size of PDF - Unprintable

    My version of AutoCAD has a "DWG to PDF" printer. It typically produces smaller pdf sizes than other pdf printers available. Not sure if its an autocad printer or something I installed ages ago. Actually, I just tried a small file using "Adobe Smallest Size" and got a significantly smaller pdf...
  8. Jrit

    Global FOS 1.3 vs 1.5 for Retaining Walls

    Those numbers (grid length and wall height) seem strange to me too. Are those grid lengths coming from your internal stability analysis or the external global stability performed by others?
  9. Jrit

    Engineer of Record

    We deal with special inspections quite often. I would expect the schedule of special inspections for this project to be produced by the tank design engineer who would be listed as engineer of record. We, as geotechnical engineers, even when we produce a report, which doesn't sound like the case...
  10. Jrit

    Rockery Wall with Geogrid reinforcement

    It is in the one's we design (grid installed between boulders, similar to a block wall). Similar methodology to LOTE. I also agree stepping up the grid strength a bit due to damage.
  11. Jrit

    Slab on Grade Foundation versus Isolated Shallow Footings for a House

    I have been told by contractors in my area (Southeast US) that slab-on-grade is cheaper than doing a crawlspace (exterior shallow spread footings and interior piers with wood framed floor). They will even build up exterior walls a few feet, backfill behind the walls with soil and pour a slab on...
  12. Jrit

    When designing a raft foundation on piles, does the soil under the raft contribute?

    MTNClimber - Thanks for the anecdotes and link. Interesting read. I hear the same types of things from contractors. "Can't believe they used that system...."
  13. Jrit

    When designing a raft foundation on piles, does the soil under the raft contribute?

    MTNClimber - Could you elaborate on issues you've experienced with aggregate piers or rigid inclusions? Or link to such info? We've recommended them on several projects in recent years and other than equipment breakdowns and occasional mis-location haven't experienced any problems that I'm aware...
  14. Jrit

    Segmental retaining wall remediation

    I don't have much experience with flowable grout, but 9 feet of drainage aggregate, grid and block seems like a lot to flow through. And, you don't know how much soil has washed into the crushed stone. Depending on the extent of the damage, maybe some formwork and grout from the bottom, possibly...
  15. Jrit

    Lateral pressure from a concrete backfill

    A 40-foot gravity wall is a big wall. What type of system are you planning to use?
  16. Jrit

    Segmental Retaining Wall for Detention Pond

    We do these occasionally, and typically spec a silty sand with less than 45% passing. A bit more silty material will probably be put behind it as there is plenty of that material in our area and it's not much of a wall. You'd want a relatively low permeability but typically the pond should...
  17. Jrit

    Post Tensioned Beam Anchorage Zone Reinforcement

    With the caveat that this comes from an unbonded PTI elevated slab spec, regarding your second question, they only require hairpins when there are a certain minimum number of tendons (5 or 6 I think) within a certain distance of each other. Perhaps that situation is something similar.
  18. Jrit

    Structural Engineer's Role in Special Inspections (Front End)

    One note I would add is that on many projects (especially smaller ones) we only get the drawings. As the special inspector firm, it helps us to have the schedule in the drawings. It is also common in our area to provide them on the drawings. We are in the southeast.
  19. Jrit

    Large format plotters

    We recently replaced an HP 500 series 24" ink-jet plotter that was at least 8 years old with a new 600 series (630 I think) 24" wide plotter. Not sure about longevity, but we've been quite happy with it so far. I think they make a 36" wide version. It was surprisingly inexpensive too (less than...
  20. Jrit

    Retaining wall + biaxial geogrid

    In my experience, the only biaxial geogrid manufactured are the lowest strength in each manufacturer's line. I have never been able to make the biaxial grids work for anything but walls a few feet tall. As i was typing, i remembered one manufacturer who does make some higher strength biaxial...

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