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  1. ayfarm

    relation of tip shape and piles end bearing

    To learnerydy, The HP stinger will dictate the end bearing capacity of the driven pile as a unit. The weakest joint is the splice between concrete and steel. This joint will always break first than any portion of pile. Before the tip hits the rock, assuming the pile "runs" during...
  2. ayfarm

    Steam or Air ?

    I appreciate your input poetix99. Trying to quantify the "effectiveness" of the nozzle "velocity" to reduce the skin friction of the soil is a nightmare. I suppose, "modelling" might help, although the scale factor is so small that accuracy could become a problem...
  3. ayfarm

    I am in the process of designing a

    I am in the process of designing a series of air nozzles for the purpose of reducing the interface soil friction/adhesion between a steel plated object and the adjacent undersea dense sand/silt soil strata, N>50<100 approx. This large object is being &quot;sunked&quot; plumb to about 80 ft...
  4. ayfarm

    Dolos in one layer

    You have to have a rock base underneath. Kd is dependent upon your assumed data and or factors.
  5. ayfarm

    Dock Design

    Refer to NAVFAC manuals and also the MIL STD.
  6. ayfarm

    Water Tower foundation design

    I would consider individual pile/ftg. foundation also.
  7. ayfarm

    DRIVING PILES THROUGH AN EARTHFILL?

    Concrete piles driven thru quarry rock, riprap size or cobbles may not sustain the impact and therefor would crack, break or refuse before tip elev. is reached. In other words u have installation probs. The moment demand is also greater at this location and ps/pc piles are prone to cracking...
  8. ayfarm

    Settlement calculation of Caisson on rubble mound

    Refer to NAVFAC foundation guide manual.
  9. ayfarm

    How do you figure the rate of sinki

    How do you figure the rate of sinking for a huge caisson having W wt. 80ft down into dense sand/silt formation 100 ft below sea level while excavating inside? Since location and plumbness are necessary, what mechanical method/means would I employ to achieve the desired goal? Thanks for input.
  10. ayfarm

    Advances in Concrete

    A good well designed mix to reach the required strength for the next construction loading phase will do the trick especially if you accelerate the curing.
  11. ayfarm

    Steam or Air ?

    Scenario is to run say min. 5000 CFM aircompressors blowing several underwater (100 ft sea) jet nozzles on and off cycle at 300 psi operating. Would steam be cheaper instead? How about freeze up and enviro concern at sea? What nozzle valve design would work to prevent soil plug ups? Please help.
  12. ayfarm

    Compressed Air Nozzle

    I am searching info on how to quantify the performance of a compressed air nozzle under 100 ft. of sea water, the purpose of which is to reduce soil friction/adhesion interaction between a huge steel object being sunked 80 ft. into dense sand/silt glacial formation. Input is 300 psi (air or...
  13. ayfarm

    Steel Pipe Piles

    I normaly run the weap analysis and determine the drivability stresses/depth using various hammers. An open ended 10&quot;d pile would plug between 15d to 30d and u may need to clean out pile. I would weld a driving plate at tip and reinforce top if driving stress are larger than 80% yield. Then...
  14. ayfarm

    Pile type comparisons

    A cast in place pile is where u drive a can then fill it up with rebar and concrete. A driven pile is a driven steel can, HP, wood or concrete pile already casted or made. Dont even think of auger piles because of enviro probs. Depending on the demand loads, the least number of pile to install...
  15. ayfarm

    Pile Depths

    It happens everyday around here. There is now a provision in the contract for the contractor to get paid LF of pile installed. It is now a common practice to perform test piles, weaps, pda's prior to production pile installation. The soils engineer still bears responsibility in some instances...
  16. ayfarm

    Pile base carrying capacity

    Run a weap analysis if values are known. Piles are designed to support compression, tension and lateral loads. You may find that you can not drive pile past its stress limit and beyond hammer's capacity during installation, such that you will have to redesign the pile anyway.
  17. ayfarm

    Pull-out calculation Steel-Pile

    I do this kind of work for a living. Yes you can pull the pile. The only question is money if you have the time. A vibro will work but there is a cheaper way to do it. To arrive at the cheapest way is to know these info. When was the pile driven Soil info driving info hammer info available...
  18. ayfarm

    Residential Footing Loads ?

    Refer to UBC code, footings are designed for seismic, gravity, wind, snow and other applicable loads in your locality.
  19. ayfarm

    Expansion joint

    Expansion joints are designed for seismic, temp, wind and other external forces encountered.
  20. ayfarm

    survey and control techniques to ensure pile installment accuracy

    Use a total station w/ EDM or an accurate DGPS system wheteher you are on land or in water!

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