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Construction Tech Review | Monday, November 07, 2022
ABC has some unknowns, but with all the bridge rehabilitation and construction projects on hold, it makes sense to continue using it.
FREMONT, CA: It is no secret that America's bridges require maintenance. In the US, highway-building boom viaducts built in the middle of the 20th century have outlived their expected lifespan by 50 years. Congress has approved trillions of dollars in infrastructure expenditure due largely to the terrible condition of bridges throughout the United States. However, money alone cannot fix the nation's bridge issues. Rapid development is also necessary to eliminate the current bridge backlog.
This is why many bridge builders in the United States are employing accelerated bridge construction (ABC) procedures. By shortening the time required to construct a bridge, this strategy decreases traffic delays and work-site risks for vehicles and construction workers. Additionally, it often reduces construction expenses.
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ABC has been around for quite some time. Most bridges constructed using this method are stronger, more durable, and survive longer than viaducts constructed with conventional methods. On several ABC bridges, however, structural concerns have been detected. Therefore, many individuals need clarification on whether these problems are unique to ABC or merely typical bridge design and engineering flaws that occur on ABC-constructed bridges.
This article will discuss rapid bridge construction and its advantages and disadvantages to assess if it's desirable to continue using it when so many structures need to be repaired or replaced.
THE FUNDAMENTALS OF ABC
A significant portion of the bridge can be constructed in a separate location using ABC. Within 48-72 hours, they are shipped to the bridge site and set up. Bridge and road closures, traffic delays, and overall project expenses can all be reduced by using ABC. Such spans are built to last centuries, often a century or more.
Commonly, ABC employs the following three methods:
Prefabricated bridge elements and systems: Prefabricated sections of a bridge are constructed away from the actual bridge site and then transported to the construction site for assembly. The deck, beams, and railings are the typical constituents.
Slide-in bridge construction: Parts of a bridge or the complete structure can be slid into a position adjacent to or in place of an existing bridge.
Geosynthetic reinforced soil-integrated bridge system: It's an unconventional method of constructing abutments and approaching embankments. The bridges have fewer bumps, which annoy travelers and could allow dangerous substances to pass.
Crews can finish the bridge by installing the pavement, lighting, and under-bridge utility lines once the main features have been built.
The on-site portion of constructing and replacing bridges is sped up with the help of ABC. It's important to note that this doesn't speed up anything. Despite the advances in ABC technology, it is still possible for the design, engineering, and planning stages to consume considerable time.
ABC: BENEFITS AND DRAWBACKS
ABC has a lot going for it when it comes to making connections. There are difficulties involved as well. The benefits and drawbacks of using this methodology are outlined below.
Advantages of ABC:
Reduced time for building (but not necessarily for developing)
Experiencing fewer traffic delays
In fewer instances will roads and bridges be closed.
Better protection for employees and motorists
Reduced building expenses
Lower effect on the environment
The longevity and durability of bridges are enhanced.
Disadvantages of ABC:
The prefabricated parts of an ABC structure must be moved into place using specialized machinery, such as self-propelled modular transporters. Construction companies need to give ABC their all if they want to make the first investment in gear worthwhile.
The machinery needs to be handled and used on the job site. ABC requires a great deal of training to be performed correctly and securely.
Installing an ABC is more difficult than other types of bridge construction. Managing it requires better preparation and coordination.
Working on an ABC project requires experts in their field. In today's competitive job market, finding this caliber of talent may take time and effort.
ABC projects have a shorter track record than more conventional bridge-building projects. ABC bridges appear safer and more durable and endure longer than conventionally constructed ones.
ABC: THE BOTTOM LINE
With the current backlog of bridge restoration and building projects, it makes logical to continue using ABC whenever possible, although there are still some questions about it. It might help the currently available infrastructure funds go further and faster toward improving the state of the nation's bridges. It's also useful for ensuring the safety of construction workers and motorists. When construction companies consider the social and economic gains from reducing the frequency of bridge and road closures, it's simple to see why ABC, or at least the increasing usage of prefabricated pieces on conventional project sites, is a good idea.
ABC should continue to be employed, but as with any novel building technique, it's crucial to keep an eye on the latest developments to ensure nothing goes wrong. In the meantime, it is sensible to increase its application to realize its benefits.
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