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Home My WebLink AboutPermit Field Test & Inspection Report 2006-1-25 .' Jan. 25. 2006 9: 57AM No.0149 P. 2/4 " c3 ~nginpering K & A Engineering, Inc. P.O. Box 23624, Eugene, OR 97402 521 Market St., Suite I, Eugene, OR 97402 (541) 684.9399 Voice (541) .&84-9358 FAX January 25, 200& Ralph and Paula Peterson 6880 Glacier Or. Spnngfield, OR 97478 Project: 49.05 'Subject: Inspection certification - Foundation underpinning City Of Springfield permit no. COM2005-01654 6880 Glacier Dr., Springfield, OR PURPOSE AND SCOPE As requested, K & A Engineering, Inc. has provided on-site inspection of foundation underpinning of the foundation of your home at the subject site address. This work was permitted by the City of Spnngfield and was completed by Van Dam Construction, Inc. Our services included on-site inspection of the piers during Installation, inspection of the leveling of the foundation after piers were installed, and this summary report. PIER INSTALLATION Underpinning Design Underpinning for this project was deSIgned by K & A Engineering, Inc. and consisted of placement of steel helical piers to support the existing concrete foundation. The design was specifIed in a repair plan that was part of our geotechnical foundation investigation report to you dated April 22, 2005. Our recommendations InCluded specific locations, pier type, and minimum ultimate pier capactties to be achieved. Pier Installation The helical piers were installed at the locations with two exceptions. See the attached As-built Pier Plan. An additional pier was required (pier no. 5) due to the presence of a large rock at the originally specified location. Also, and additional pier was needed near the water heater, pier no. 17, due to an error in our original foundation plan's dimensions. Piers 1-5 and 10-35 consisted of 2.875-mch diameter schedule 80 high-strength steel pipe with a 10.inch, 12- inch, and 14-inch helical plate welded to the bottom lead, separated by approximatelv 2-feet Piers 6-9 consisted of a 2.875-inch diameter schedule 80 high-strength steel pIpe with a 1 Q-inch and 12-inch helical plate welded to the bottom lead. . Jan. 25. 2006 9:57AM No.0149 P.3/4 K a A Englnesring, Inc. Piers were driven into the ground using a hydraulic drive system to screw the piers into the soil. Pressure readings of the hydraulic drive pressure, correlated to drive torque, were taken for each pier installed. Table 12 shows the maximum pressure and torque readings at the final installed depth for each pier. Table 1 . Pier Installation Summary Drive Calc. Required Pressure, Torque, ft- U1t. UIl Pier Depth, ". psi Ib Capacity, k Capa(;ity, k 1 10.5 1800 6121 61 44 2 8 1300 4421 44 44 3 10.5 1800 6121 61 44 4 10 2000 6801 68 44 5 9 1800 6121 61 44 6 8 1500 5101 51 44 7 9 1800 6121 61 44 8 10 1500 5101 51 44 9 7 1100 3741 37 44 10 9 1800 6121 61 44 11 9 1800 6121 61 44 12 10 1800 6121 61 44 13 10 1900 6461 65 44 14 10 1700 5781 58 44 15 9 1800 6121 61 44 16 10.5 1750 5951 60 44 17 10 2000 6801 68 44 18 10 1800 6121 61 44 19 13 1700 5781 58 44 20 19 2100 7141 71 70 21 16.5 2100 7141 71 70 22 12.5 2100 7141 71 70 23 12 2100 7141 71 70 24 11 2100 7141 71 70 25 11 2300 7821 78 70 26 10.5 2100 7141 71 44 27 11 2300 7821 78 44 28 11 2100 7141 71 44 29 11.5 2100 7141 71 44 30 12 2100 7141 71 44 31 16.5 2300 7621 78 70 32 18 2300 7821 78 44 33 18 2100 7141 71 44 34 16 2200 7481 75 44 35 16 2100 7141 71 44 Project: 49.05 Chent: Peterson 6880 Glacier Dr., Springfield, OR Page 2 of 3 January 25, 2006 . Jan. 25. 2006 9: 57AM No. 0\49 P. 4/4 K It A Engineering, Inc. After pier installation, Fasteel' Ultra pier brackets2 were Installed over the exposed pier shaft into recessed slots cut into the footing, so that the pier bracket shelf solidly supported the stem wall The brackets were attached to the foundation using two 5/8.inch expansive anchors. \ Note that the bracket for pier 31 was a specially fabricated bracket designed to attached to the side of the stem wall using *-inch steel plate and attached to the wall using 6 - %-inch diameter grade 75 all-thread bars affixed to the wall using high-strength epoxy. After installatIon of the brackets, hydraulic jacks were used to lift the foundation on the piers. A level was used to determine floor level, and a torque wrench was used on the jacks to ensure even distribution of foundation loading to the supporting piers. After pier installation and foundation leveling, the areas surrounding the piers were backfilled and graded. SUMMARY AND RECOMMENDATIONS Based on our field observations and measurements, the piers, as installed, meet our design specifications for capacity. We believe that the underpinning system, as installed, is adequate to support the design live and dead loads for the foundation. We recommend acceptance Of the foundation underpinning system, as-built, by the local building official. Thank you for the opportunity to be of service. Please call me if you have any Questions. Sincerely, Michael Remboldt, P.E. K & A Engineering, Inc. cc: Van Dam Construction, Inc. 1 The pier and bracket manufacturer and supplier of1he hydraulic drive eqUipment is Fasteel Systems, 463 Kirkwood Rd., #58, St Louis, MO 63122 www.fasteel.com 2lhese brackets have a rated ultimate capacity of 120 kips. Project 49.05 Client: Peterson 6880 Glacier Dr., SpringfIeld, OR Page 3 of 3 January 25, 2006 . Jan, 25. 2006 9: S8AM " -f k geo!echn.icaVcivil "- ...:J engineering U Eugene, OR 97408 l en gin e er i n g 541 684 9399 541 6849358 fax No. 0150 P. 1/1 Ji9. Projed: 6880 Glacier Dr. , Client. Peterson - COM200S-01654 Job No: 49.05 Date:. 1/24/2006 Sheet: 1 of 1 ,; '" '\ EXISTING FOUNDATION AND STEMWAlL (TYP.) - HELICAL PIER AND BRACKET TYPICAL r~----~----W-, : ';-----------, ~~- --~---~-~ I I L_______-, r----l ~ I I I I I I ~I II II ;tfl II 1,k1 II II I~ I L_________~ I I I I I r^---ft"--~-~~' I I J ~I )}, LU ~ L!,). ~'--------J L____J . I ~ , , I I gg-g---&--g~ : I I I I , I ,L- W WI , : ~ }} r-----"~ , ~ I I I I I Rf--W--~lr-..., "I I I I I L__..,' r----.-:J I ~ I I I I I I I - . I I ~ I I """ I 11 --'lY-_J ~ - I I ~ L________J I I I I I I I I I I I I I I I I I I I I I L________---1 I L__________~ CD AS-BUilT PIER P~A~_. 1 - 3/32" = 1'.0" ~' "