1003 Sprague Street_Edmonds Special Inspection.pdfSTARK
FOUNOATIONS
July 17, 2018
Mr. Ken Marquardt
Ram Jack West
850 Bethel Drive
Eugene, Oregon 97402
Re: Special Inspection - 1003 Sprague Street, Edmonds, Washington
Permit No.: BLD2018-0879
Dear Ken-
4001 Main Street, Suite 305
Vancouver WA,98663
P: 360.566.7343
I have performed the special inspection of the installation of the helical piers per ICC ESR-1854 for the above -referenced
oroiect.
Helical Pier Installation:
The helical pier used for installation was a 2 7/8 inch diameter pipe with a 10 inch diameter helix configuration. The
installation was performed by RamJack West certified installers for RamJack Products using a 2.5K drive head.
The maximum axial load requirement for this project is 22000 Ibs ultimate load. The piers were driven to depths of 7 - 10
feet with a minimum installation pressure of 3000 psi. This results in an ultimate axial capacity of 25010 Ibs, exceeding the
required ultimate load per the design documents.
Summary:
Based on my special inspection and structural observation, the helical piers were installed according to the engineering
design load requirements and according to ESR-1854.
Please give our office a call if you have any questions or need further assistance
Regards,
Daniel Stark, P.E.
Stark Foundations, Inc.
Attachments: Drive Log
Helical Driver Torque Chart
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I?XPIRFS: 07/13/20
RAM.lACK
Foreman: Mchael Martin Crew: Start Date: 7/9/18
HELICAL PIER DRIVE LOG
ADDRESS: 1003 Soraoue St, Edmonds, WA.
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HELICAL DRIVER TORQUE CHART
2.51K Driver
Dealer :
Ram Jack Systems Distribution, LLC
13655 County Road 1570
Ada, OK 74820
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Torque Equation:
Hydraulic Motor
Model: Sauer Danfoss 151-7257 T= (Pressure 247placement� Gear Ratio*%,motor*�
11 gear
Displacement (in') : 19.32
where: Pressure = hydraulic pressure (psi)
Gear Drive: Displacement = hydraulic motor displacement (in')
Model : Fairfield S07A26604 q— = motor efficiency
Ratio : 4.1 17 W r = gear drive efficiency
Tor ue Chart
Pressure (psi) 1 500 750 1 1,000 1 1,250 1 1,500 1 1,750 2,000 1 2,250 1 2.500 1 2,750 0 3,000
Torque((t-lbs) 1 463 1 6951 927 1 1,158 1 1,390 1 1,622 li 1,853 1 2,085 1 2,317 1 2,548 1 2,780
*NOTE: The torque can also be calculated at any hydraulic pressure by multiplying the pressure by the psiltorque factor for this
helical driver which is 0.926.
Ultimate
*NOTE: 1) Ultimate Capaeity(Q„) = Installation Torque (7) x Torque Correlation Factor(K,).
2) Capacities shown in table assumes the pile is fully braced and has no eccentric loading.
3) A safety factor of2 should be applied to the ultimate capacity to obtain the working load capacity.