HomeMy WebLinkAbout917 ROCKY RD - SPECIAL INSPECTIONS - 2/24/20214400 NE 77th Ave, Suite 275
Vancouver, WA 98662
P: 360.566.7343
E: starkd@starkfdn.com
February 24, 2021 Project No.: 20.010.CBS
Wendy LangdonLangdon
Complete Basement Systemste Basemment Systeems
11795 E 45th Avenue45th Aveenue
Denver, Colorado 80239Coloradoo 80239
RE: Special Inspection - 917 Rocky Road , Fort Collins, Coloradoecial Insppection - 9917 Rockky Road , Fort Collins, Coloorado
Permit No.: B2100739No.: B21000739
Dear Wendy :endy :
I have performed the special inspection of the installation of the helical and push piers per IBC Chapter 17 for the above-referenced project.
Helical Anchor Installation:
The helical anchor used for installation was a 2 7/8 inch diameter pipe with a 10” & 12” diameter helix configuration. The installation was
performed by Complete Basement Systems certified installers for Groundworks products, using a 7K drivehead.
The maximum axial load requirement for this project is 3,000 lbs working load, 6000 lbs ultimate load. The anchors were driven to depths of 16 to
17 feet, with a minimum installation pressure of 2,100 psi. This results in an ultimate axial capacity of 56700 lbs, exceeding the required ultimate
load per the design documents.
The following part numbers were installed:
Lead P/N: TAH-288-60-10-12
Extension(s) P/N: TAH288
Bracket P/N: PP21617-34B
Push Pier Installation:
The push pier used for installation was a 2 7/8 inch diameter pipe using a FS35DC Drive Cylinder with a working area of 9.62 square inches. The
installation was performed by Complete Basement Systems certified installers for Groundworks products.
The maximum axial load requirement for this project is 10,000 lbs working load, 20000 lbs ultimate load. The piers were driven to depths of 25 to
31 feet, with a minimum installation pressure of 5750 psi. This results in an ultimate axial capacity of 55315 lbs, exceeding the required ultimate
load per the design documents.
The following part numbers were installed:
Lead P/N: PP21617-36PTA w/ Friction Reduction Collar
Extension(s) P/N: PP21617-48ESA
Bracket P/N: PP21617-34B w/ PP21617-48ES Guide Sleeve
Summary:
Based on my special inspection and structural observation, the helical and push piers were installed according to the engineering design load
requirements and according to IBC Chapter 17.
Please give our office a call if you have any questions or need further assistance.
Regards,s,
Daniel Stark, P.E.Stark, P.E .
Stark Foundationsoundationns
Nathan Daniel
W Stark
Digitally signed by
Nathan Daniel W Stark
Date: 2021.02.25
10:25:34 -08'00'
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2
Hydraulic
Pressure (PSI)
Driving Force
(Pounds)
GREY
( 14.18 in2 )
Drive Cylinder
14.18 Factor
Driving Force
(Pounds)
RED
( 9.62 in2 )
Drive Cylinder
9.62 Factor
Hydraulic
Pressure (PSI)
Driving Force
(Pounds)
GREY
( 14.18 in2 )
Drive Cylinder
14.18 Factor
Driving Force
(Pounds)
RED
( 9.62 in2 )
Drive Cylinder
9.62 Factor
200 2,836 1,924 5,200 73,736 50,024
400 5,672 3,848 5,400 76,572 51,948
600 8,508 5,772 5,600 79,408 53,872
800 11,344 7,696 5,800 82,244 55,796
1,000 14,180 9,620 6,000 85,080 57,720
1,200 17,016 11,544 6,200 87,916 59,644
1,400 19,852 13,468 6,400 90,752 61,568
1,600 22,688 15,392 6,600 93,588 63,492
1,800 25,524 17,316 6,800 96,424 65,416
2,000 28,360 19,240 7,000 99,260 67,340
2,200 31,196 21,164 7,200 102,096 69,264
2,400 34,032 23,088 7,400 104,932 71,188
2,600 36,868 25,012 7,600 107,768 73,112
2,800 39,704 26,936 7,800 110,604 75,036
3,000 42,540 28,860 8,000 113,440 76,960
3,200 45,376 30,784 8,200 116,276 78,884
3,400 48,212 32,708 8,400 119,112 80,808
3,600 51,048 34,632 8,600 121,948 82,732
3,800 53,884 36,556 8,800 124,784 84,656
4,000 56,720 38,480 9,000 127,620 86,580
4,200 59,556 40,404 9,200 130,456 88,504
4,400 62,392 42,328 9,400 133,292 90,428
4,563 64,700 43,894 9,600 136,128 92,352
4,600 65,228 44,252 9,800 138,964 94,276
4,800 68,064 46,176 10,000 141,800 64,700
5,000 70,900 48,100 - - -
Driving Force Comparison
****Lower hydraulic pressure is much safer!!!***
7.16.2020_rev1
Comparative Analysis Between
GREY ( 14.18 in2 )
and
RED ( 9.62 in2 ) Drive Cylinders
Driving Force Comparison
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