Micropiles – An Overview Micropiles – An Overview - AGC

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Basic Design Process Step 1>>>Evaluate Feasibility and Requirements Step 2 >>>Review available information and geotechnical data Step 3 >>>Develop applicable load combinations Step 4 >>>Prepare preliminary design Step 5 >>>Prepare structural design of cased length Step 6 >>>Prepare structural design of uncased length Step 7 >>>Revise preliminary design, as necessary Step 8 >>>Evaluate geotechnical capacity Step 9 >>>Estimate group settlement Step 10 >>Design cap connections Step 11 >>Develop Load Test Program Step 12 >>Prepare Drawings and Specifications
Step 8 >>Evaluate Geotechnical Capacity • Establish Stratum for Bond Zone ‣ Certain soils not generally suitable (e.g., organics, cohesive soils w LL>50, PI>20); (if must be used, include comprehensive testing, increased FS) • Select Ultimate Bond Strength (ά bond ) and Compute Bond Zone Length (L b ) ‣ P G-Allowable = P Ultimate /FS = 1/FS (q p A p ) + 1/FS (ά bond π D b L b ) ‣ R R = φ R n = φ qp R p + φ qs R s = φ qp (q p A p ) + φ qs (π d s ά b L b ) ‣ Consider end bearing in high quality rock only with adequate verification of rock quality and construction methods to obtain good contact; ‣ Provide minimum bond length in contract documents; ‣ Assume Type A for bond zone in rock and Type B for bond zone in soil; ‣ See references in NHI-05-039 and AASHTO LRFD 4 th Ed, 2007 Interim 2008
Page 1 and 2: Micropiles - An Overview April 1, 2
Page 3 and 4: Definition - Micropile • A small
Page 5 and 6: Micropile Classification System Ref
Page 7 and 8: Case 1 Micropiles (After FHWA NHI-0
Page 9 and 10: Case 2 Micropiles (After FHWA NHI-0
Page 11 and 12: Micropile Classification Based on G
Page 13 and 14: Possible Applications of Micropiles
Page 15 and 16: Overview of Micropile Applications
Page 17 and 18: Micropile Installation (After: FHWA
Page 19 and 20: Drilling Techniques May Be Propriet
Page 21 and 22: Drilling Techniques May be propriet
Page 23 and 24: Steel Reinforcement • Steel casin
Page 25 and 26: Footing Connections Compression
Page 27 and 28: Footing Connections Compression and
Page 29 and 30: Footing Connections Compression and
Page 31 and 32: Grouting (Including Post-Grouting)
Page 33 and 34: Grouting Equipment
Page 35 and 36: Foundation Arrangement
Page 37 and 38: Design for Structure Foundations
Page 39 and 40: Basic Design Process Step 1 >>>Eval
Page 41: Step 4 >>> Prepare Preliminary Desi
Page 45 and 46: Step 8 >>Evaluate Geotechnical Capa
Page 47 and 48: Design for Lateral Loading • Same
Page 49 and 50: Basic Design Process Step 1>>>Evalu
Page 51 and 52: Load Testing Program • “Verific
Page 53 and 54: QA/QC
Page 55 and 56: QA - During Construction Contractor
Page 57 and 58: Birmingham Bridge Retrofit for Capa
Page 59 and 60: Numa T-150 Eccentric Percussive Dri
Page 61 and 62: Installing Casing
Page 63 and 64: Flushing the Hole Clean During Dril
Page 65 and 66: Installing Reinforcing Bar with Spa
Page 67 and 68: Birmingham Bridge Subsurface Profil
Page 69 and 70: Typical Ultimate ά bond Micropile
Page 71 and 72: Birmingham Bridge Pier 10N Strength
Page 73 and 74: Birmingham Bridge Pier 10N Strength
Page 75 and 76: Thanks to the following for selecte

Micropiles – An Overview Micropiles – An Overview - AGC

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