Special Topics in Structures

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343341 - Foundation Retrofit of Three Buildings Utilizing Micropiles

Saturday, April 21
8:00 AM - 9:30 AM
Location: 204AB

FOUNDATION RETROFIT OF THREE STRUCTURES UTILIZING MICROPILES

John H. Edens, P.E.1 and Billy L. Fisher2

1Senior Design Engineer, Hayward Baker, Inc., 661 Shahan Prairie Road, Little Elm, TX 75068; JHEdens@HaywardBaker.com
2Senior Project Manager, Hayward Baker, Inc., 661 Shahan Prairie Road, Little Elm, TX 75068; BLFisher@HaywardBaker.com

ABSTRACT:
Micropiles are an economical foundation solution for projects that have access constraints and low headroom conditions. Conventional piling techniques can be expensive or even impossible in these types of situations when foundation upgrades are required. Micropiles have been used to retrofit existing foundations due to under design of existing foundations or to upgrade existing foundations for added load. This paper will discuss three case studies where micropiles were used to retrofit existing buildings. The first project is a parking garage in Lake Highland, Texas where 36 micropiles were used to remediate 12 of the existing failed parking garage column piers. The second project is a fifty-plus year-old building in downtown Dallas, Texas where 24 micropiles were used to upgrade existing foundations for new loads due to building renovations. The third project is another fifty-plus year-old building in downtown Dallas, Texas that involved the conversion of an existing basement into a parking garage. It required 5 micropile to underpin an existing wall footing that was to be undermined for ramp construction and 6 additional micropiles to support three new wall columns created within an existing wall to allow the passage of cars. The new foundations were installed within the project schedule and will provide long-term support for all applied foundation loads.

John Edens

Senior Design Engineer
Hayward Baker, Inc.

John has spent 28 years in the geo-structural design-build construction business working for both contractors and consultants, including Nicholson, Bauer, Clark Construction, AMEC Earth and Environmental, Kleinfelder and currently serving as a senior design engineer with Hayward Baker Incorporated in their Dallas Texas regional office. His experience includes design of soil nail and anchored walls, concrete diaphragm walls, soil mixing, jet grouting, compaction grouting, micropiles, drilled shafts, stone columns and rigid inclusions. John earned his Bachelors of Science degree in Civil Engineering in 1989 from Virginia Tech. He is a past chairman for the DFI Soil Nail and Tiebacks Committee and has been a presenter at many ASCE events over the years.

Presentation(s):

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Billy Fisher

Senior Project Manager
Hayward Baker, Inc.

Billy Fisher is a Senior Project Manager at Hayward Baker, Inc. with over fifteen years of experience in geotechnical construction. He is responsible for the Grouting, Foundations and Ground Improvement Division for the Little Elm TX. office of Hayward Baker, Inc. Responsibilities include bidding and managing a variety of geotechnical construction projects for the Central Region. Duties include soliciting work, reading specifications to verify constructability, preparing estimates and bid packages. Managing project details and client relations are also among routine duties. Responsible for the overall management of the divisions office and field staff.

Presentation(s):

Send Email for Billy Fisher


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