gi boston chapter 1 day seminar vibration monitoring tibbutt

3/6/2018

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Construction-Induced Vibration Monitoring

Prepared by:

Matt Tibbutt

Geocomp

Acton, MA

January 27, 2018


INTRODUCTION

Matthew Tibbutt

16 years I&M Experience

Europe, Middle East, North America

Burj Khalifa - UAE

CrossRail - London

Edmonton LRT – Alberta

Crenshaw Corridor – Los Angeles

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WHY MONITOR VIBRATIONS?

Damage to utilities

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Damage to buildings



Human perception

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TYPICAL CAUSES OF VIBRATIONS

Compactors

Driven and vibrated piles

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TYPICAL CAUSES OF VIBRATIONS

Ground improvement

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Demolition


HOW DO WE MEASURE VIBRATIONS?

General categories of vibration monitoring instruments

Earthquake

Blasting

Construction

Digital

Analogue

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Evolution of vibration monitoring

instruments over time

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How do vibration monitoring

instruments work?

Spring-mounted magnetic mass

moving within a wire coil to

generate an electrical signal

High speed analogue to analogue

to digital processor

Data acquisition unit

Readout

Communications

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Pros and cons of different systems

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PRACTICAL ASPECTS OF VIBRATION MONITORING

Equipment installation

Access

Security

Permissions

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Power

sources

Mains

Solar

Battery

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Protection of instruments

Vandalism

Theft

Accidental knocks from

construction operations

Accidental knocks from third

parties

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Equipment rental versus purchasing

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TRANSMISSION AND REPRESENTATION OF DATA TO END USERS

Historical

approach

Person stood

viewing data on

site

Chart recorded

data

Mailed or faxed

reports

Flashing beacon

warning

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TRANSMISSION AND REPRESENTATION OF DATA TO END USERS

Recent Advances

Wireless 4G communication

Web accessed near real time data

Email or text message alerts to stakeholders

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CONTRACTURAL ISSUES WITH VIBRATION MONITORING

Parties involved with typical projects

City / Town / Authority

Project Owner / developer / architect

Contractor

Engineers

Sub contractors

Utility owners

Adjacent property owners

Residents adjacent to project

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Flow chart of chain of command

Email alert issued to all stakeholders (contractor, owners, engineers)

Monitoring consultant verify data

Monitoring consultant discusses exceedance with contractor to obtain

source of vibration.

All stakeholders discuss mitigation to prevent further exceedances

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Who specifies what will be monitored and what are limiting values of

vibration?

Engineers specification defines areas to be monitored and limits

Consultants propose on non specified projects

Who gets access to the data?

Contractor

Owner

Engineers

Owners Project Managers

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VIBRATION MONITORING SPECIFICATIONS

Specifications often copied from previous projects, often not updated

with time

May not contain site-specific considerations

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Typical specified requirements for vibration monitoring

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Issues with

implementation of

specified requirements

Outdated requirements

Impractical locations –

instability of installation

on utilities

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Recommendations for vibration monitoring specifications

Updated requirements to match modern technology

Real thought given to location

Real thought given to threshold and limit levels

Less reliance on outdated standards to obtain limits

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CASE STUDY OF INSTRUMENTATION MONITORING

Edmonton

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CASE STUDY OF INSTRUMENTATION MONITORING

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IN THE PIPELINE

FULL MOBILE FUNCTIONALITY

IN THE PIPELINE

FULL MOBILE FUNCTIONALITY

3/6/2018

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IN THE PIPELINE

INTEGRATION INTO MANAGEMENT SOFTWARE

November 9, 2017

IN THE PIPELINE

INTEGRATION INTO MODELLING SOFTWARE


FUTURE ADVANCES IN INSTRUMENTATION MONITORING

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LOW COST – MASS

DEPLOYED

SACRIFICIAL

SENSORS

REAL TIME

ADJUSTMENT TO

PREDICTIVE

MODELS

INTERGRATION OF

CROWD SOURCED

DATA

USING HISTORICAL

DATA TO PREDICT

THE FUTURE

Questions?

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gi boston chapter 1 day seminar vibration monitoring tibbutt

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