HomeMy WebLinkAboutHelical Piling Insallation Cert, original Design/Build, Engineering, Construction Management
Innovative Design.,Solid ConstrLiction. . ®s.I
CHRISTOPHER KARCW&ASSOCIATCS
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Kirk Ljongquist
Kirk's Bobcat Service, Inc.
14538 94"'Street North
West Palm Beach,33412
June 4,2020
Ref: Helical Piling Installation Certification for"Pool&Spa"
Project: Cox Residence
123 Queen Federika Ave
North Hutchinson Island, FL
Certification of 10 Helical Piles under Pool&Spa
Engineer: M. Randall Rogers, PE
i
1801 Hazelwood Drive
Fort Pierce, FL 34982
FL PE 68212
Project No.: n/a
Dear Kirk:
This letter will certify your installation of 10 helical piles under the Pool&Spa as specified by the referenced engineer.
The engineer directed you to install all ten(10)helical pilings with a working load of 12 tons Capacity and an Ultimate Load
of 24 tons Capacity. The depth of the installation is as noted on the attached Table 1.0.
The Helical Pier Distributions, LLC installation and Design guidelines; specifically,the psi to Torque Chart, indicates that a
field pressure reading of 2,200 psi yields 7,000 ft-lbs of torque. In accordance with the Criteria sheet entitled,"Determining
Capacity from the Hydraulic Pressure" and using their ratio of"9.0"for a 2.875-inch diameter shaft;this minimum torque
generates a capacity of(7,000*9.0)=63,000 lbs or 31.5 tons.This is the"installed"capacity. i
The field results for this project as indicated in the attached Table 1.0 meets or exceeds the specified requirement of the
engineer.
This letter certifies that all ten(10) pilings meets the engineer's design requirement.
Please contact me should you have any further questions or inquiries.
Thank you kindly,
Christo!<herCarch;PE-President
COA 78,24=7
Christopher Karch&Associates 13125 Tangerine Blvd West Palm Beach FL 33412 www.cka-inc.com 561.686.5577
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HELICAL PILE INSTALLATION CERTIFICATION
by.
CHRISTOPHER KARCH,PE
CHRISTOPHER KARCH ASSOCIATES,INC.
13125 TANGERINE BLVD
s
WEST PALM BEACH,FL 33412
(561)686-5577
FLORIDA PE 50024
COA 7824
Design Engineer of Record: M.Randall Rogers,PE
123 Queen Federika Ave
North Hutchinson Island,FL
Referenced Torque Chart"
Project No.:n/a Pressure Reading Torque
Phone:(772)201-1634 (psi) (ft.lb)
Fax: 1000 2000
Florida PE:68212 1350 3500
COA: 1500 4050
1700 5000
Owner/Residence: Cox Residence 1950 6000
123 Queen Federika Ave 2200 7000
North Hutchinson Island,FL 2300 7480
2500 8200
Installer. Kirk's Bobcat Service
Kirk Ljongquist
(561)718-0222 Specification: 12 Ton Working Load Capacity
24 Ton Ultimate Load Capacity
Helical Pile: Helical Pier Distributions,LLC Date of Installation:5/18/2020
2 r/e'dia.Shaft
30"between Helices
Calculations pursant to Helical Pile Manufacturer
TABLE 1.0-INSTALLATION DATA VS DESIGN CRITERIA
Piling No. Depth Pressure Reading* Torque" K factor Installed Load Capacity Design Capac"*•* SF over Working Capacity
(ft) (psi) (ft.lbs) (1/ft) (Ibs) (kips) (tons) (tons) (unitless)
1 28 2200 71000.0 9 63,000 63.0 31.50 12 2.63
2 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
3 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
4 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
5 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
6 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
7 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
8 35 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
9 28 2200 7,000.0 9 63,000 63.0 31.50 12 2.63
10 28 - _2200_ 7,000.0 9 63,000 63.0 31.50 12 2.63
• Field Pressure Reading --- --__- -- - - -- _
•• Pursuant to Pier Helical Pier Systems Referenced Torque Chart for 2 7/8"Shaft - -
"* Per Design Engineer of Record
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