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Iowa DOT Seminar 4

This document discusses techniques for deploying instruments to monitor phenomena in the built world such as vibrations, crack movements, tilt, and settlement. It describes various seismographs, sensors, and methods that can be used to monitor these phenomena remotely including through logging devices, remote communication technologies like cellular modems, and solar power solutions for locations without AC power. The goal is to effectively capture data on structural movements and changes over time through continuous or triggered monitoring.

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lrbol
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39 views24 pages

Iowa DOT Seminar 4

This document discusses techniques for deploying instruments to monitor phenomena in the built world such as vibrations, crack movements, tilt, and settlement. It describes various seismographs, sensors, and methods that can be used to monitor these phenomena remotely including through logging devices, remote communication technologies like cellular modems, and solar power solutions for locations without AC power. The goal is to effectively capture data on structural movements and changes over time through continuous or triggered monitoring.

Uploaded by

lrbol
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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SOLUTIONS FOR THE BUILT WORLD

Fall 2015 Iowa DOT Vibration Seminar


Techniques of Instrument
Deployment
Click to edit Master title style

W. Robert Hannen
rhannen@wje.com
Techniques of Instrument Deployment

 Phenomena to Monitor
 Vibrations
 Crack Movements
 Tilt
– Structural movement
– Soil movement
 Settlement
Techniques of Instrument Deployment - Vibrations

 Seismographs
 Instantel  White Industrial
Seismology
– Minimate Plus
– Mini-Seis III
– Minimate Pro4, Pro6
– Mini-Seis
– Micromate
 Geosonics/Vibratech
– 3000LC
– 3000-EZ Plus
– 3000LCP
– 5500
Techniques of Instrument Deployment - Vibrations

Instantel
Minimate Plus

Minimate Pro4

Micromate
Techniques of Instrument Deployment - Vibrations

Geosonics/
Vibratech
3000LC

3000-EZ Plus

3000LCP

5500
Techniques of Instrument Deployment - Vibrations

 Attaching Seismometer
 In Ground

 Hard Surface
Techniques of Instrument Deployment - Vibrations

 Attaching Seismometer
 Underside of slab
 Wall
Techniques of Instrument Deployment - Vibrations

 Seismograph Installation Preferences


 In-ground is best reflection of the USBM
guidelines
 Usually basement slab is chasen
 Avoid boilers, furnaces, sump pumps,
dehumidifiers.
 Keep logging unit out of low water area.
Techniques of Instrument Deployment - Vibrations

 Monitoring Modes
 Waveform Recording
– Triggered or manual
– Fixed length or Auto-record
 Histogram
– Logging Interval
– Store
– Peak Particle Velocity
– Frequency
– Peak Vector Sum = Sqrt(L2 + T2 + V2)
 Histogram/Combo
Techniques of Instrument Deployment - Vibrations

 Monitoring Modes (continued)


 Histogram/Combo
– Continually collect histogram data
– Trigger to capture waveform event if a threshold
is exceeded
 AutoCallHome (essential)
– Transmit files to remote server when any event
occurs
– Trigger level exceeded
– Scheduled upload time
– Allows server to send alert notifications
– Results in 2 emails for triggered event
Techniques of Instrument Deployment - Vibrations

 Communication (Remote Access)


 Land-line modem
 Cellular modem
– Airlink RavenXT
– Sierra Wireless LS300
– Serial interface
– Static IP address for remote access
– i.e. 166.156.17.70
 Satellite modem
Techniques of Instrument Deployment - Vibrations

 Communication Issues (Remote Access)


 Signal strength (RSSI)
– Basements
– Rural areas
 Supplemental antenna
 Antenna cable extension
 Signal booster
 Serial cable extension
Techniques of Instrument Deployment - Cracks

 Measurement Modes
 Visual observations
– Crack Gages
– Tell-Tale Crack Monitors, RST Instruments Ltd.
– Crack Monitoring Equipment, Geotest
Instrument Corp.
– Avongard Crack Monitor, Avongard Products
USA
Techniques of Instrument Deployment - Cracks

 Measurement Modes
 Visual observations
– Optical Comparator
– Fowler 7x Lupe
Techniques of Instrument Deployment - Cracks

 Measurement Modes
 Remote
Logging/Monitoring
– Potentiometer
– LVDT
– Mount plunger & core
on opposite sides of
the crack
– Requires
weatherproofing
– Continuous power
Techniques of Instrument Deployment - Cracks

 Measurement Modes
 Remote Logging/Monitoring
– Requires logging device and remote
communications
– Sensor can be affected by temperature changes.
Techniques of Instrument Deployment - Tilt

 Tilt Monitoring for structural movement


 Single axis or bi-axial
– Use with logging device and remote
communications for single location
– Use single tilt meter with several anchored base
plates to be read periodically
– Can be affected by temperature changes
– May require stabilization period depending on
sensor type.
– Mounting location is an issue
– Column
– Slab or beam between columns
Techniques of Instrument Deployment - Tilt

 Tilt Monitoring for structural movement


– Applied Geomachanics Model 711
– Jewell InstrumentsTuff Tilt 801
Techniques of Instrument Deployment - Tilt

 Tilt Monitoring for Soil Movement


– Borehole Inclinometers
– Would detect lateral soil move before it effects
surface-mounted structures
– Several casings with one inclinometer
– Requires manual readings at incremental
depths
– Single borehole with several inclinometers
anchored at several depths
– Can be monitored with logger and remote
communication
Techniques of Instrument Deployment - Settlement

 Elevation and Lateral Position Surveys


– Referenced to a stationary benchmark
– Targets on buildings, pavements
– Manual optical survey equipment
– Scribe marks
– Total Station
– Prisms mounted on surfaces
– Can be automated
Techniques of Instrument Deployment - Vibrations

 When AC Power is
not available:
 Solar panel
 Enclosure with
battery
Techniques of Instrument Deployment - Vibrations

 When AC Power is
not available:
 Solar panel
 Enclosure with
battery
Techniques of Instrument Deployment - Vibrations

 When AC Power is
not available:
 Solar panel
 Enclosure with
battery
Techniques of Instrument Deployment - Vibrations

 When AC Power is
not available:
 Solar panel
 Gangbox with
battery
 Transducer buried
in ground beneath
box

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