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DRIVEN PILE SPECIFICATIONS

DRIVEN PILE SPECIFICATIONS. Chapter 11. Generic Specification (11-6). Owner responsible to “estimate” pile lengths. Contractor responsible to provide and install undamaged piles. Must satisfy minimum required depth of embedment. Must drive to required ultimate capacity, w/ reasonable BC.

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DRIVEN PILE SPECIFICATIONS

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  1. DRIVEN PILE SPECIFICATIONS Chapter 11

  2. Generic Specification (11-6) • Owner responsible to “estimate” pile lengths • Contractor responsible to provide and install undamaged piles. Must satisfy minimum required depth of embedment • Must drive to required ultimate capacity, w/ reasonable BC

  3. Approved Hammers (11-9) OED Measure Stroke (11-10) CED Bounce Chamber Pressure (11-10)

  4. Battery Proximity Switches Transmitter

  5. Approval of Pile Driving Equipment (11-11) Wave Equation Equipment Form (11-14) Reasonable Blow Count 30-120 bpf (11-15) Driving Stresses (11-15, chap 10) Concrete (f’c, fpe) Steel (fy)

  6. Grade 50 ksi

  7. ASD Factors of Safety (11-16) Ultimate Pile Capacity (11-17) Must be shown on Plans: ASD Or LRFD Optimum Pile Installation – Maximum Curvature (11–17)

  8. Drive System Components (11-19) Hammer Cushion (11-19) Pile Cushion w/ concrete piles (11-20) New Pile Cushion for each Pile Used Pile Cushion for Re-Strikes Leads (11-21)

  9. Hammer Cushions • Are materials placed between the pile hammer ram and the helmet • It’s function ? To relieve impact shock and thereby protect the hammer while at the same time transmit consistent energy to the pile

  10. Recommended: Not Recommended: Man-made cushion materials made of micarta, nylon, urethane, or other polymers Hardwood Plywood Wire rope Asbestos Hammer Cushions

  11. NIM

  12. NIM

  13. NIM

  14. Pile Cushion • Concrete piles require a pile cushion between the helmet and the pile lead • Typically made of plywood, hardwood, plywood & hardwood composites, or other man-made materials

  15. NIM

  16. NIM

  17. Followers(11-21) Only with Engineer’s Approval Jets (11-22) Only with Engineers Approval Pre-Boring (11-22) Only with Engineers Approval

  18. Follower • Is a member interposed between a pile hammer and a pile to transmit blows when the pile head is below the reach of the hammer • Use of a follower is accompanied by a loss of energy delivered to the pile due to compression of the follower & losses in connection

  19. NIM

  20. Jetting • The use of a water or air jet to facilitate pile driving by displacing parts of the soil • Jetting is useful in driving piles through very dense material

  21. NIM

  22. Spudding • The act of opening a hole through dense material by driving or dropping a short & strong member & then removing it • Used as an alternate to jetting or predrilling in upper soil consisting of miscellaneous fill

  23. NIM

  24. Gates Formula – limited (11-23) Phase in WEAP (11-25) Static Load Tests (11-26 & 27) Include Dynamic Testing (11-28) Contractor Responsibilities (11-29) Restrike (11-30) Duration Cold Hammer

  25. Tolerances (11-35) Pile Heave (11-35) Installation Sequence (11-36) Unsatisfactory Piles (11-36) Pay Items (11-40)

  26. ANY QUESTIONS ?

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