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Y , <br /> Structural Calculations - Residence Underpinning <br /> Project Name : May Residence Project No. : 19001.18 <br /> -row iammg] <br /> Designed By : DET Date : 10-Jun-19 ENGLNE NG <br /> DESCRIPTION: <br /> The structural calculations and drawings enclosed are in reference to the design of the foundation underpinning of the single- <br /> story residence located in Everett,WA as referenced on the coversheet.The round steel tubes and retrofit brackets are used to <br /> stabilize and/or lift settling foundations.The bottom and back portion of the bracket is securely seated against the existing <br /> concrete footing. Using the weight of the existing structure, pier sections are continuously hydraulically driven through the <br /> foundation bracket and into the soil below until a load bearing stratum is encountered. Lateral earth confinement and a driven <br /> external sleeve with a starter pier provide additional stiffness to resist eccentric loading from the foundation. Once all piers are <br /> installed,they are simultaneously loaded with individual hydraulic jacks and closely monitored as pressure is applied to achieve <br /> desired stabilization and/or lift prior to locking off the pier cap.The piers are required to resist vertical loading from the roof <br /> framing,wall framing,floor framing,concrete slab on grade,and concrete turn-down footing. <br /> The entire underpinning system has been reviewed and analyzed and is therefore a fully engineered system complying with all <br /> current codes and stamped by a licensed design professional. Deep foundation guidelines, load combinations,special inspection <br /> and testing requirements per IBC 2015 have been included.Axial and bending capacities of the external sleeve,analysis of the <br /> retrofit foundation bracket, design reductions,and corrosion considerations have been incorporated in all required calculations <br /> per AISC 360-10.Concrete foundation span capacities have been analyzed per ACI 318-14. Bracket fabrication welding has been <br /> performed by Behlen Mfg Co.conforming to AWS D1.1 performed by CWB qualified welders certified to CSA Standard W47.1 in <br /> Division 2. In addition, Behlen Mfg Co. has received US99/1690 certification meeting ISO 9001:2008 requirements by ANAB <br /> accredited SGS. <br /> PIER LAYOUT PLAN: <br /> NOTES: <br /> 1. CONTRACTOR TO NOTIFY ENGINEER OF <br /> RECORD OF DISCREPANCIES BETWEEN FIELD <br /> CONDITIONS&THOSE SHOWN IN THESE. <br /> DOCUMENTS PRIOR TO <br /> CONSTRUCTION/INSTALLATION OF PIERS <br /> NDRIM <br /> 2. (E)CONCRETE STEMWALL ON(E) <br /> CONC FOOTING(CONTRACTOR TO <br /> VERIFY 6"1x1'-41H(MIN)(E)CONC <br /> STEMWALL AND 18'Wx6"DP(E)CONC <br /> FOOTING MIN TYP(NOTIFY EOR IF <br /> FIELD CONDITIONS DIFFER)) <br /> 3. aghtDETAIUS EET S-2.00 .-® <br /> 4. INDICATES LOCATION OF FSI 288 PUSH %3, SMART JACK, <br /> ®w PIER W/FSI FS288BL FOUNDATION TIP(3) <br /> BRACKET PER S-2.0 <br /> PUSH PIER INSTALLATION NOTES: <br /> • DESIGN LOAD TO PIER=7,073 L8 = <br /> • 3.5"0 x 0.216 x 30'LONG EXTERNAL PIPE to. <br /> SLEEVE . <br /> • 2.875"0-x 0,165 x 36"LONG PIER TUBE <br /> + 3.5.0 DRIVE AND LIFT CYLINDER BORE <br /> • TARGET 1471 INSTALLATION PRESSURE <br /> • MINIMUM 1103 PSI INSTALLATION PRESSURE <br /> • MINIMUM 10'-0"INSTALLATION DEPTH <br /> + MINIMUM 114"FOUNDATION LIFT DURING ® <br /> INSTALLATION TO STABILIZE <br /> I' <br /> 5. PIER SPACING SHALL BE AS INDICATED ON PLAN W C) © C j ( j <br /> (6-0-MAX) <br /> , 8'-0" T-2" j T 0" <br /> LEGEND PUSH PIER. L6x6x3/8x3'-0" <br /> • PUSH PIER TYP(8) TYP(2) <br /> ANGLE IRON \\ <br /> SMART JACK <br /> Tower Engineering Company 21907 64th Ave.W,Suite 140, Mountlake Terrace,WA 98043-2298 Sheet 1 of 7 <br />