Bridge Inspections For A Safer Infrastructure
Discovering the path to remain relevantAugust 28th, 2018 Author: Rajika Jayatilake
A nation’s treasure is buoyed by the existence of healthy infrastructure. On the flip side, a bridge collapse is a monstrous and unjustifiable loss of national treasure, apart from the ensuing loss of innocent lives and unwarranted loss of property.
Genoa Italy Bridge Collapse
As consequential as infrastructure is, one would expect that only the best of attention would be mobilized to take care of a country’s bridge system. And more so in an age of technology when accuracy and convenience are available at the touch of a button.
However, reality brings a rude awakening. More often than not, technology is bypassed in the crucial task of bridge inspections, and archaic inspection methods over half a century old, still hold sway. The result can only be a disaster waiting to happen.
And disasters do happen. The latest collapse of a bridge that received global attention, was a 200-meter stretch of a highway bridge in Genoa, Italy, which gave way during a violent storm on August 14, 2018, killing 38 people, injuring at least 15 others, and rendering 10-20 more people missing, while destroying 35 cars and a number of trucks, which dropped 45 meters to the railway below.
Subsequent investigations into the disaster exposed severe underspending on aging infrastructure over the years, even though heavy tolls were collected from road users.
What happens in the US is somewhat different. US authorities are spending colossal budgets every year, on inspection, repair and maintenance of the aging US bridge system, but with little result. Despite gobbling down precious tax payer dollars, many bridges continue to be in a state of grave deterioration.
Red flags are rustling urgently, even as maintenance work gets done. The primary problem is inaccurate diagnoses and insufficient data of bridge conditions obtained from obsolete inspection methods. And it is self-explanatory, that unless a correct diagnosis is made, the cure is not going to be effective, whatever the money spent on repair and maintenance.
This begs the question, when preventive maintenance is lighter on the nation’s purse than replacing parts of bridges, why isn’t more care given to the process of maintenance, which starts with bridge inspection?
To counter the current muddled situation, small firms such as Florida-based Infrastructure Preservation Corporation (IPC), have introduced modern technologies utilizing customized robotics and drones.
These methods are convenient and speedy, and provide accurate and quantitative data to help the Department of Transportation (DOT) better allocate its limited resources.
Robotics are able to detect issues early in the infrastructure lifecycle. Asset owners, therefore, are able to carry out repairs early, extending the service life of the structure and saving billions in untimely replacements. The same inspections that are currently being done manually, can be done with greater accuracy, and with quantitative results, by using modern technology and robotics.
IPC engages nondestructive technology (NDT) in robotic systems that are able to identify deterioration in concrete and other structural material at the initial stages. In fact, IPC has taken modern technology to another level, by producing custom-built robotics that enable quantitative results. And all this is possible with existing DOT budgets. With the results it receives, IPC is able to provide an action plan for repairs before deterioration spreads and compromises the safety of bridges.
Material deterioration, fatigue, vibrations, foundation integrity issues, design flaws and consistent loads and overloads on bridges weaken their serviceability and lifespan. Extreme weather conditions add to the problem. Intense heat can warp concrete and steel while salting of bridges in harsh winters will corrode steel. Conventional technologies can only expose these problems when they are apparent to the naked eye, which is too late to prevent a disaster.
IPC has shown how robotic devices are able to provide precise quantitative data for an entire bridge, not just for sections of it.
The data provided is decisive enough to expose any problem minutely. It clues in on anything irregular, even before the issue becomes a problem.
This is where the knowledge and years of experience of bridge inspectors, can make a difference. Accurate data provides the opportunity for inspectors to make real-time assessments, identifying exact locations and sizes of irregularities.
Armed with their skills and expertise, inspectors are able to analyze the information received and decide how to proceed with repair and maintenance.
Post Tension Tendon Inspection Service
Locates loss of metallic area inside external tendons.
When I interviewed the president of Infrastructure Preservation Corporation, Doug Thaler as to why technology like this has not been adopted for bridge inspection globally, his response was, “With the condition of infrastructures worldwide, it is only a matter of time.”
Thaler explained that modern technology and robotics provide more quantitative data for less money and exceed requirements of Federal Highway Administration (FHWA) and American Association of State Highway and Transportation Officials (AASHTO), the two agencies that set the standards for these inspections. He said, “Typically, and unfortunately change only takes place after a catastrophe. After the I-35 collapse of 2007 in the US, new regulations were released. You will see the same in Italy after the recent collapse.”
In the I-35 disaster, the design anomaly ensured an accident waiting to happen, since the bridge opened for business. Yet, inspectors were taken completely unawares because seeking out design errors is not standard practice for bridge inspections. Had technology been used instead, quantitative data may have indicated an abnormality before disaster struck, for what should have been the strongest part of the bridge, was in fact, one of its weakest.
With inspections done the same way for over 50 years by a handful of companies, it appears more than time to let fresh air in. Says Thaler, “The asset owners themselves need to be at the forefront of legislating the changes. Also, local heads of USDOT districts have the authority to pull any work away from current asset managers in the interests of the public. Those who don’t want a catastrophe striking on their watch, will start exerting their authority before it’s too late.”
Unfortunately, infrastructures worldwide have aged and deteriorated to a point where business as usual will put lives at risk.
The bridge inspection industry seriously needs to welcome the advantages of technology before another bridge collapses somewhere.
American writer Adora Svitak very fittingly said, “To ignore technology is to become obsolete.”
OLD INSPECTION METHOD
NEW INSPECTION ROBOTIC SERVICES
* Lane Closures
* Bucket Trucks Required for many inspections
* Quantitative Data
* Few or No Lane Closures
* Fewer or No Bucket Trucks
* Quantitative Data
* Provides action plan for repairs
* Helps the asset managers better allocate assets to conduct repairs.
By locating early stage deterioration and properly maintaining & conducting repairs the service life of our critical infrastructure assets can be extended and untimely replacements