DFI / ADSC Joint Micropile Committee Meeting – October 19, 2011

The next DFI / ADSC Joint Micropile Committee meeting will take place at the DFI 36th Annual Conference on Deep Foundations in Boston, MA on Wednesday, October 19th from 10AM to 12PM. All committee members are encouraged to attend. The venue location is below:

The Seaport Hotel and World Trade Center
One Seaport Lane
Boston, MA 02210

To see a copy of the latest Chairman’s report for the Joint Committee, click HERE.

More information on the 36th Annual Conference on Deep Foundations can be found HERE. See you in Boston!

DFI Super Pile 2012 Conference – Invitation to Speakers

May 16-17, 2012
Hilton Portland & Executive Towers
Portland, OR, USA

Six of DFI’s technical committees have joined forces to organize this year’s Super Pile Conference. The two-days will consist of sessions on the subjects of Driven Piles, Augercast Piles, Drilled Shafts, Micropiles, deep foundation applications in the marine environment, testing and evaluation of foundation systems as well as design for seismic considerations. The first day will be a combined session; the second day will be two concurrent sessions giving attendees the option to choose which presentations are of interest to them.

Presentations will focus on concept/method, historical development, theory and design, system specifications, system attributes and ideas for future development. Equipment, material and instrumentation suppliers and vendors will be presenting their services as well in the exhibit hall. Complete details of the event as plan progress can be found at www.dfi.org.

Presentation proposals are solicited on the following topics relating to Driven Piles, Augercast Piles, Drilled Shafts, Micropiles, Testing and Evaluation, and Marine Foundations:

  • Seismic Considerations
  • Case Studies
  • History / Theoretical Background
  • Quality Control and Inspection
  • Unique Pile Systems
  • Marine Applications
  • Innovation
  • Practice-Oriented Research
  • New Equipment and Technologies
  • Relationship between Design, Construction and Equipment used in a project.
  • Sustainability

Potential Speakers for SuperPile 2012 should submit a brief abstract (no more than 300 words) describing the subject matter of their proposed presentation. Please include the presentation title and presenter name in the abstract document. The due date for abstract submissions is Friday, December 16, 2011. Please send proposals to DFI Headquarters via email to Katie Criqui (kcriqui@dfi.org).

Notification of acceptance and guidelines for presentation development will be returned to all submitters no later than Monday, January 23, 2012.

All authors of accepted proposals will be required to commit to presenting their topic on May 16th or 17th and will be required to submit a paper or PowerPoint presentation handout to be included in the seminar publication by Wednesday, April 25, 2012.

Questions should be directed to:

Katie Criqui, Event Coordinator
Deep Foundations Institute
326 Lafayette Avenue, Hawthorne, NJ 07506 USA
Tel: 973-423-4030, FAX: 973-423-4031, Email: kcriqui@dfi.org

Upcoming Deep Foundations Industry Events

The following upcoming events are good places to learn about micropiles and stay up to date on what is going on in the micropile industry. Some are micropile specific while others are more general deep foundations oriented with micropile components or associated events. Click on the individual links for more information:

DFI / ADSC Joint Micropile Committee Meeting
Thursday, July 28, 2011
ADSC Summer Meeting
The Charleston Place Hotel, Charleston, SC

ADSC Anchor and Micropile Installation School (AMPIS)
September 11-16, 2011
Houston, TX

DFI 36th Annual Conference on Deep Foundations
October 18-21, 2011
The Seaport Hotel and World Trade Center, Boston, MA

ADSC 2012 Equipment Expo and Conference
March 14-17, 2012
San Antonio, TX

DFI SuperPile 2012
May 16-17, 2012
Portland, OR

DFI / ADSC 2012 Micropile Seminar
Tentative Date: Mid-November 2012 (exact date TBD)
Washington, DC

Stay tuned for more information as the dates for these events get closer.

Jon Bennett Joins Brayman Construction Corporation


Saxonburg, PA (June 8, 2011) — Jonathan Bennett, PE, D.GE, M.ASCE has recently joined the Brayman Construction Corporation team as Chief Engineer; Mid-Atlantic Region. Operating out of Brayman’s Manassas, VA office, Bennett will head the efforts to develop the Mid-Atlantic market for Brayman’s Foundation Division for specialties such as caissons, marine and piling and drilling and grouting. Jon can be contacted at (304) 707-4840.

Brayman Construction Corporation is a leading regional, specialty and general contractor guided by values of EQUITY, URGENCY, TENACITY and PROFESSIONALISM. Incorporated in 1947, grown and diversified by the current ownership/leadership since 1992, Brayman has become a nationally recognized provider of heavy civil construction projects. Brayman’s competencies include: large scale, complex bridges, broad based geotechnical construction, marine and dam construction and rehabilitation, complex and heavy steel erection and rehabilitation and demolition services. The company targets technically challenging projects in all of the above areas of expertise.

Visit our website at: www.brayman.com for additional information.

A Second Chance: LRFD for Micropiles Webinar

If you missed the last one, there is another ASCE Continuing Education webinar coming up on LRFD for Geotechnical Engineering Features: Micropile Foundations. The date is advertised as Friday, July 29, 2011 at 11:30AM to 1:00PM. You get the best bang for your buck if you register and make it available to a group because for one registration fee, you can have an unlimited number of people from your organization attend at your site. I have seen this webinar and it is worthwhile if you are new to AASHTO LRFD Design for Micropiles or if you just want to get a bunch of geotechnical engineers together on a Friday to have fun talking about Micropiles. I know of one group that registered an entire local ASCE Geotechnical Chapter for it.

Find out more and register for the event HERE. The webinar description is below:

This webinar focuses on micropile foundations. Micropile foundations are often a technically sound and cost-effective foundation choice where a deep foundation solution is appropriate based on site conditions, applied loads and project schedule and performance requirements. The Load and Resistance Factor Design (LRFD) platform offers a rational framework for consideration of micropile foundation systems. The webinar will use the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge and Structures Specifications as a basis for the technical content. The webinar will include discussion on the terminology and construction of micropiles. It will also focus on topics such as: identification of limit states and resistance factors, axial compression and uplift resistance of a single micropile, estimation of grout-ground bond resistance and tip resistance, and group efficiency factors for evaluation of axial resistance of micropiles in groups. It is assumed that the participant has a basic working knowledge of design and construction of deep foundations.

Post 2011 DFI / ADSC Micropile Seminar Update

The 2011 DFI / ADSC Micropile Seminar held last week in Little Rock, AR was an exciting whirlwind tour of micropile technology and featured presentations from the leading micropile practitioners in the United States and worldwide. The next Micropile Seminar will occur sometime in either Spring, Summer or Fall of 2012. Keep an eye out for information on this event that is likely to be combined with an Anchored Earth Retention seminar to boot.

The Peabody Hotel, Little Rock, AR







If you are interested in LRFD for Micropiles, I have posted my presentation on the subject from the seminar on my Scribd page. You can view that presentation and others I have given in the past at http://www.scribd.com/jonbennett. If you have questions or comments as to other aspects you would like to see covered, let me know as I will be presenting a revised version at the next seminar.

In terms of upcoming Micropile industry events, don’t miss SuperPile this week in Charleston, SC. The next ADSC / DFI Joint Micropile Committee meeting will be held at the ADSC Summer Meeting also in Charleston, SC. Check ADSC’s website for information on that. Hope to see you at one of these events.

LRFD vs SLD for Micropiles Comparison

Load and Resistance Factor Design (LRFD) is the predominant design method utilized today for reinforced concrete and structural steel, and is the primary focus of the relatively new AASHTO LRFD Bridge Design Specifications. Historically, micropile design has been performed mainly with Service Load Design (SLD) and Allowable Stress Design (ASD) methodologies and most of the design manuals and specifications in existence prior to 2008 were based on SLD and ASD concepts. The AASHTO LRFD Bridge Design Specifications document offers the most comprehensive LRFD guidance for geotechnical engineering features in the United States (and maybe the World) today. The use of this LRFD design specification is mandated by the majority of State DOTs for use in designing highway bridges and highway structures governed by it. The AASHTO LRFD specification adopted a micropile design section in 2008.

In recent DFI / ADSC Micropile Seminars, there have been a number of questions regarding the proper use of LRFD for micropiles. On May 4, 2011, at the DFI / ADSC Micropile Seminar in Little Rock, AR, I will give a presentation that will cover the fundamentals of LRFD as it applies to micropiles, and will provide a comparison with SLD methodology. We will work through an example analysis problem where we will see how every aspect of micropile axial design compares between SLD and LRFD. We will be looking specifically at FHWA and IBC Service Load Design compared to AASHTO LRFD design. This covers pretty much all the current bases for mainstream micropile design. I have never seen this type of comparison presented so don’t miss out.

Register HERE. Hope to see you in Little Rock!

2011 DFI / ADSC Micropile Seminar

Details have been finalized for the 2011 DFI / ADSC Micropile Seminar to be held in Little Rock, AR. Complete information and registration details are available on the ADSC website.

Date: Tuesday and Wednesday, May 3-4, 2011
Location: Peabody Hotel, Little Rock, AR, USA

DFI / ADSC Micropile Seminar

A day and a half event to discuss the history of micropiles, design and construction, industry challenges, load testing, material and equipment, quality control, and selected case histories. This seminar will include a presentation on LRFD for micropiles in response to increased interest in the subject. The event will feature presentations from the leading North American and worldwide experts on micropile design and construction.

Presentations will include:

  • History and Overview
  • Structural Design
  • Geotechnical Design
  • Load Testing
  • Lateral Loads on Vertical Micropiles
  • Hollow Bar Micropiles
  • Local Micropile Design
  • Materials and Equipment
  • LRFD for Micropiles (by yours truly)
  • Panel Discussions

Exhibitor spaces and sponsorship opportunities are available.


Don’t miss this once-a-year event! Get full information HERE.

A Brief History of Micropiles

The first use of micropiles dates back to the early 1950’s in Italy, where new methods of underpinning for existing structures were needed to restore structures and monuments damaged during World War II (Lizzi, 1982). Dr. Fernando Lizzi is commonly recognized as the inventor of micropiles in the form of the root pile or palo-radice.

Dr. Lizzi was a civil engineer and Technical Director with the Italian specialty foundation contractor Fondedile and obtained the first patents for root piles in Italy in 1952. This early form of micropile technology was used extensively in Europe for the restoration of various structures and monuments.

Fondedile introduced micropiles into North America in 1973 by performing a number of projects, mainly in the Northeastern United States. By the mid 1970’s a number of US specialty foundation contractors previously engaged in drilled and grouted anchor work had developed their own variants of the technology. There was slow growth of the technology in the time period between the mid 1970’s and the mid 1980’s with Fondedile closing their North American venture for economic reasons. (Bruce and Juran, 1997)

There has been a rapid growth in the specification and use of micropiles in the United States since the mid 1980’s to early 1990’s partly as a result of FHWA research efforts, trade association promotion efforts and the development of various publications offering standardized design and specification guidelines.

In the early 1990’s, the Intermodal Surface Transportation Efficiency Act (ISTEA) provided massive funding for the rehabilitation of highway infrastructure in the United States. As part of this effort, the FHWA undertook a number of research and development projects associated with specialty geotechnical construction to encourage innovation in geotechnical applications and produced several design manuals including the first on micropiles. This was the beginning of the surge in micropile use in the United States.

In 2006 and 2007 respectively, the International Building Code and the AASHTO LRFD Bridge Design Specifications incorporated design code sections for micropiles thus making way for further expansion of applications in both building and highway construction. Micropiles currently are widely specified and used in all construction sectors worldwide.

Dr. Fernando Lizzi