Full Issue (17 MB) - Pile Driving Contractors Association

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personal experience, for lower frequencies and greater durations, many objects are more responsive and for higher frequencies and short durations, many objects are less responsive. Table 1 illustrates a generalized sensitivity range, where 0.1 ips is 2.54 mm/sec, 1 ips is 25.4 mm/sec and 4 ips is 101.6 mm/sec. Sensitive Equipment and Computers • Standards are typically in accelerations expressed in (g) • Common acceleration standard is 0.25 g. At a frequency of 20 Hz, the equivalent PPV is about 19.04 mm/sec (0.75 in/sec). • These standards are typically designed for earthquake standards or steady state vibrations during operation • Equipment and computers are far less susceptible to short term transient vibration effects from construction than from the steady state operating standards usually published MINIMIZING LIABILITY Monitoring There are various types of instruments or seismographs available to measure ground vibrations and impact noise levels. To obtain reliable vibration measurements, the seismograph’s geophone must be well connected to the ground or the recording location – this is called coupling. For earth locations, the geophone should be buried at least 152 mm, spiked and covered with a sandbag. In an urban environment, the geophones should be bolted or otherwise adhered to the ground. Areas to avoid include unstable ground or hollow areas. With advances in technology, remote monitoring stations can be set up that allow real time posting of vibration data to a secure website that can be accessible by the contractor and state regulatory authority as needed. Action vibration levels can be set on the equipment to transmit data over a pre-determined level and text message and emails can be sent when those levels were recorded. Pre-Piling Surveys: Pre-piling building condition surveys provide a baseline of the property’s appearance prior to the start of piling. The surveys should be conducted by competent and experienced individuals and companies. The survey perimeters vary. Usually a range of 30.48 to 182.9 meter from the piling is standard. Typical survey formats consist of diagram sheets, color photos and supplemental videos of existing conditions. The use of high quality digital photographs and scanned (pdf) files incorporated into electronic copies of the surveys puts the data into a usable format for today’s construction project software. Education of Public and Communications A great deal of prospective problems, complaints and claims of damage from pile driving vibrations can be reduced with good communication at the onset of the project. Simply explaining to the surrounding property owners what they may expect to feel from pile driving activities can go a long way in the overall reduction in complaints. . excellence through experience over 20 years serving the northeast region. Geotechnical Engineering Soil and Rock Mechanics Shoring and Underpinning Design <strong>Pile</strong> Load Testing and Inspection Vibration Monitoring Construction Materials Testing Third Party Inspections Survey Layout 70 Pleasant Hill Road Mountainville, NY 10953 1-800-829-6531 www.tectonicengineering.com 94 • Q4 • 2009
Recordkeeping Good record keeping is essential for liability protection. The following information has to be documented at a minimum: what piles (type and length) are driven, when and where, seismograph serial number and location, distance and direction from seismograph to each pile, and make, model and energy of the hammer. CONCLUSION There is no perfect solution for dealing with the problems of pile driving near properties. However, there are some things that can be done to reduce the problems, such as: • Maintenance of good public and community relations • Performance of appropriate and detailed pre-construction surveys – establish base line condition of neighboring properties • Undertaking of seismic monitoring, including the use of remote web based systems Following the above recommendations and having a good understanding of vibrations and techniques for measuring them are necessary to mitigating problems related to pile driving vibrations. Submitted by: David Harrison, Vice President and Principal, Seismic Surveys, Inc, 4375 Gibsonia Road, Suite 4, Gibsonia, Pennsylvania; dharrison@seismicsurveys.net Article summarized from ‘Contemporary Topics in Deep Foundations’, 2009 International Foundation Congress and Equipment Expo, Edited by Magued Iskander, Ph.D., P.E., Debra F. Laefer, Ph.D., Mohamad H. Hussein, P.E. t With advances in technology, remote monitoring stations can be set up that allow real time posting of vibration data to a secure website that can be accessible by the contractor and state regulatory authority as needed. • Q4 • 2009 95
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THE OFFICIAL PUBLICATION OF THE PIL
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PILE DRIVING CONTRACTORS ASSOCIATIO
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We Service You From Mill Rollings W
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PORT OF HOUSTON EXPANSION BUILT ON
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and Wayne Waters (president, Ed Wat
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Executive Director’s Message Exec
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meeting in Orlando, FL. The meeting
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With nearly 200 acres of stock and
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Charlie Gibson Manson Construction
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Annual Membership Directory As a me
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PDCA MEMBERSHIP APPLICATION Step St
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A Driving Force in the Foundation E
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Chapter Updates Chapter Updates PDC
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THE SHAPE OF THE FUTURE... Port of
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Member Profile Footing piles for po
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Member Profile Johnson Bros. Many M
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The company is a “F.A.S.T.” (Fo
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Independent Pipe and Steel, Inc. Me
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Taking the Lead in over40 countries
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DRIVEN PILE COST COMPARISON for two
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on hammerhead piers, incorporating
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We Get Thousands of Tons of New Pil
Page 47 and 48: The results of the DPH test did con
Page 49 and 50: The vibration compacts the concrete
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Page 55 and 56: RoyOMartin-Colfax Treating speciali
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Page 59 and 60: Driven Treated Timber Piles Lead th
Page 61 and 62: Steel piles take the LEED® in a GR
Page 63 and 64: MARINE AND HEAVY CONSTRUCTION 711 E
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Page 67 and 68: pumped from the top of the pile to
Page 69 and 70: “MAFCO” - Your one stop shoppin
Page 71 and 72: AZ / Larssen U AZ / Larssen U Ball
Page 73 and 74: The Harvey Canal Project: Saving Ti
Page 75 and 76: Project Spotlight Miles and Miles o
Page 77 and 78: Project Spotlight Safety Procedures
Page 79 and 80: Project Spotlight Kremer carries
Page 81 and 82: Project Spotlight “It’s interes
Page 83 and 84: Project Spotlight Seeing the waters
Page 85 and 86: THE BUSINESS OF BUSINESS THE BUSINE
Page 87 and 88: in English while performing specifi
Page 89 and 90: PDCA 14 th Annual Conference and Ex
Page 91 and 92: 2010 PROJECT OF THE YEAR Awards Put
Page 93 and 94: Monitoring Pile Driving Vibrations
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Page 99 and 100: 2009 New PDCA Members Contractor Me
Page 101 and 102: 2009 New PDCA Members SK Geotechnic
Page 104: A.P.E. AMERICAN PILEDRIVING EQUIPME
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Full Issue (17 MB) - Pile Driving Contractors Association

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