Bridges

SoundPrint® is a patented innovative monitoring technology that can detect and locate failures in high-strength steel wire, strand or cable through continuous, non-intrusive remote monitoring.

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With SoundPrint, bridge owners and engineers finally have a tool that helps ensure the long-termintegrity of post-tensioned, pre-tensioned, suspension and cable-stayed bridges. SoundPrint detects and locates tensioned wire failures through continuous, non-intrusive remote monitoring.

Because it continuously monitors for failure of tensioned steel elements, SoundPrint saves money on other bridge inspection and NDE techniques. Once SoundPrint has generated an understanding of the frequency and location of wire failures, other investigative techniques can be more cost-effectively applied to further evaluate the extent of deterioration. Information generated by the system can be integrated into the owner’s Bridge Management System

Types of Bridges


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Suspension Bridges

The main cables and suspender ropes of suspension bridges are often subjected to aggressive environments. Hidden corrosion of the wires leads to reduction in structural safety. SoundPrint provides complete, continuous surveillance of cable components on suspension bridges so that areas of active corrosion can be pinpointed.

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Cable-Stayed Bridges

The SoundPrint acoustic monitoring system provides a complete, continuous remote health monitoring solution for stay-cables. Corrosion or fatigue-induced failures can be detected long before they compromise the integrity of the stay. Because the system can track the actual number of dynamic cyclesthe stays experience, realistic fatigue performance can be compared with theoretical assumptions.

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Post-Tensioned Bridges

Suspect grouting practices and poor detailing have led to concerns about the durability of post-tensioned bridges and their susceptibility to corrosion-induced tendon failure. SoundPrint has been used to provide assurance about the condition of post-tensioned bridges with sophisticated acquisition and event filtering capabilities that can reliably detect low energy wire breaks in fully-grouted tendons in noisy environments.

How it Works


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Step 1

SoundPrint Acoustic Monitoring system is installed on a bridge or structure.

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Step 2

Sensors measure the dynamic energy released when tensioned wires fail.

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Step 3

Onsite Data Acquisition Unit performs preliminary hardware filtering and real-time pre-processing, rejecting superfluous acoustic event data.

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Step 4

Data from events that has passed preliminary filtering processes is transferred to our data-processing centre to be further examined.

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Step 5

Through a combination of applied proprietary software and analysis by highly trained professionals, acoustic events are assigned a time, location, and specific classification.

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Step 6

If and when the event is classified as noteworthy, electronic alerts are sent via email to the client. The data is immediately accessible on the 3D GIS website, and reports can be custom generated.

Information on Demand

Through the SoundPrint website, clients can now access data from their structures directly. Using the intuitive interface, managers can custom design their own reports, generated in real time. Acoustic events can be examined and replayed in real audio format, and presentation-quality reports for multiple sites can be viewed and printed.

Using our powerful and versatile GIS-based Management Interface, information from other instrumentation systems can also be integrated into the SoundPrint acquisition and processing system. Information from entire infrastructure management networks can be viewed on the client’s custom website. This provides managers with desktop access to a single-source, reliable service for all instrumentation requirements, providing information where it's needed, when it’s needed.

Case Studies

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Case Study: Fret Hartman Bridge

After the Fred Hartman Bridge was completed in 1995, large-amplitude vibrations of the cables were observed. Following comprehensive testing, TxDOT installed a SoundPrint® Acoustic Monitoring System to monitor any wire break activity occurring within the stays.

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Case Study: Waldo-Hancock Bridge

In order to ensure the future safety of the bridge, Maine DOT commissioned Pure Technologies to install a SoundPrint® acoustic monitoring system to detect and locate any future wire breaks. The SoundPrint system utilized wireless sensors to monitor both main cables from anchorage to anchorage.

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