Vibrations from Construction Activities
Vibrations from construction activities such as blasting, rock excavation, general excavation, pile driving, and tunneling can lead to property damage, litigation, project delays, and increased costs. Automated vibration monitoring provides a reliable and cost-effective way to control for excessive vibrations, protecting project owners, construction companies, and nearby properties.
Typical Monitoring Requirements
Vibration Monitors: A vibration monitor with a triaxial geophone must be installed at a specified location to record vibrations. Larger projects may require multiple vibration monitors and geophones. Each monitor continuously samples the three channels of its geophone, recording the highest values at regular intervals. If any sampled value exceeds an alert threshold, the monitor stores that “event” with additional data. Events should be reported immediately.
Data Transfers: Data must be offloaded from the vibration monitor for processing.
Compliance Reports: Compliance reports are generated using specialized software. The most common reports are histograms and waveforms. Histograms, which present the highest values recorded during every 15 minute interval, can be used to demonstrate that the site was actively monitored. Waveform reports, generated only for alert-level events, present a waveform plot, peak particle velocity for each channel, and other information.
Ready Access to Data: It is useful to have complete records of the monitoring program available in case of claims.
Alerts: Alerts must be distributed quickly to inform those responsible for construction activities that vibration limits have been exceeded and that some action has to be taken.
Advantages of Automation
Minimal Maintenance: Automated systems are protected by rugged, weatherproof enclosures. AC or solar panels keep batteries charged, and automated memory management ensures that monitoring continues without interruption.
Unattended Data Transfers: Automated systems transmit data to a server at regular intervals. When an alert threshold is exceeded, the system transmits data immediately, so that alerts and waveform plots can be sent out.
Scheduled Compliance Reports: Automated systems generate compliance reports at specified intervals and can distribute the reports by email. This saves time, eliminates complicated workflows, and frees staff for less repetitive work.
Web Access to Data: Automated systems store all data files and reports on a secure server, ensuring that compliance records are complete. The files are easily accessed with any browser by visiting a password-protected website. The website can also show the alert status of all the vibration monitors on the site and generate plots and csv data files on demand.
Timely Alerts: Automated systems can send out near-real time alerts complete with an attached waveform report to smartphones and PCs. Alerts are also displayed on the website. Real-time alerts consisting of on-site strobe lights and warning horns can be implemented for critical applications.
Automated Vibration Monitors
PVM – Portable AVM
The PVM adds the convenience of automation to a portable vibration monitor. It has a
strong, waterproof case and is designed to be repositioned as required by the project. The PVM includes an Instantel vibration monitor and geophone, a cell modem with activated cell service for automated data transfers, and a 15 Ah battery with charging regulator.
AVM – Standard AVM
The standard AVM includes is supplied in a lockable, weatherproof enclosure that can be mounted on a wall or pole. It includes an Instantel vibration monitor and geophone, a cell modem and service for automated data transfers, an external antenna, a 7Ah battery with charging regulator, and an AC adaptor. AVMs can also be supplied with solar panels.
RVM – Rugged AVM
The RVM features features a heavy-gauge steel enclosure, a shatterproof solar panel, and
low profile antenna. It includes an Instantel vibration monitor and geophone, a cell modem and service for automated data transfers, two well-secured, large capacity AGM batteries, modular connections, fuses, control panel, a solar controller with digital readout, and more.
Provided with Automated Systems
- Continuous monitoring
- Automatic data transfers
- Automatic memory management
- Automatic alert notifications
- Secure data storage on GEO server
- Automatic data processing on GEO server
- Automatic generation of standard reports
- Automatic generation of customized reports
- Web access to data & reports
Options & Services
- Rent or buy
- Monthly fee for web service
- Branded website
- Solar panel
- On-site strobe and horn
The AVM monitors continously in histogram-combo mode. Measurements are transferred offsite to GEO’s AMP server at scheduled intervals. If a waveform recording is triggered, it is transferred immediately after the event.
The AMP server receives and processes the measurements, checking if alarms notifications should be sent. Notifications are sent out as emails or text messages.
Measurements are then stored in a project database and made available on the project website. Users visit the project website to see PPV status, histogram reports, and waveform reports.