Micropiles Design 101 - Structural Engineers

1 Micropiles Design 101 Allen Cadden P EAllen Cadden, Chester, PALas Vegas, NV 2008 Objective Develop a background understanding of the geotechnical and Structural Design processes for Micropiles in Structural foundation support for Considerations5Bi fD i Design for Engineers Fundamentals are similar to Fundamentals are similar to traditional pile Design However, due to the small Structural section, Structural Design and stiffness can often controloften control3 Designers Must UnderstandAvailable Tools Drilling rigs Drilling rigs Drilling methods Available Structural Materials Reasonable Bond ValuesValues Quality ControlConstruction Techniques Drill Rig 4 Micropile Materials Permanent Steel Pipe API 5CT & ASTM A252 80 ksi yield Flush joint threads Steel Reinforcement ASTM A615, Gr. 60 & 75 ASTM A722, Gr. 150 Mechanical coupling Hollow barsCtGtStar Iron Works Cement Grout Neat cement ASTM C150 W/C ratio of 4000 psi (min)Williams FormDesign Involves: Knowing the site Knowing the site Understanding the loads Understanding the geology Calculations Specifications Specifications Quality Control5A Word on Geology Review of Geotechnical Dataobtain samples anddevelop sections obtain samples and develop sections estimate Design parameters evaluate corrosion potential identify problem areas, if anyMicropile Design Steps Internal - Structural External - Geotechnical Connection of Pile to Structure62.

Micropiles Design 101 Allen Cadden P EAllen Cadden, P.E. West Chester, PA Las Vegas, NV 2008 Objective • Develop a background understanding of the geotechnical and structural design processes for micropiles in structural ... Geotechnical Design – Empirical Average Bond Values (allowable loads) ...

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