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FHWA > Every Day Counts > Accelerating Technology > Prefabricated Bridge Elements and Systems > GRS-IBS

GRS-IBS

What is GRS?

GRS–IBS is a form accelerated bridge construction (ABC) that lowers cost, slashes construction time, improves durability, and increases safety — all at the same time. For budget–challenged Federal, State, and local transportation agencies, that is a life-saver.

GRS–IBS technology uses alternating layers of compacted granular fill material and fabric sheets of geotextile reinforcement to provide support for the bridge. GRS-IBS also provides a smooth transition from the bridge onto the roadway, and alleviates the "bump at the bridge" caused by uneven settlement between the bridge and approaching roadway. The technology offers unique advantages in the construction of small bridges, including:

GRS process step 1: Lay a row of facing blocks. GRS process step 2: Add a layer of compacted fill to the height of the facing blocks. GRS process step 3: Add a layer of geosynthetic fabric (reinforcement).

How Does It Work?

Rather than installing a deep foundation, this reinforced soil method builds up the substructure in a faster, simpler way. A GRS integrated bridge system is similar to a layer cake!

Step 1:  Lay a row of facing blocks.

How Does It Work?

Rather than installing a deep foundation, this reinforced soil method builds up the substructure in a faster, simpler way. A GRS integrated bridge system is similar to a layer cake!

Step 1:  Lay a row of facing blocks.

Step 2:  Add a layer of compacted fill to the height of the facing blocks.

How Does It Work?

Rather than installing a deep foundation, this reinforced soil method builds up the substructure in a faster, simpler way. A GRS integrated bridge system is similar to a layer cake!

Step 1:  Lay a row of facing blocks.

Step 2:  Add a layer of compacted fill to the height of the facing blocks.

Step 3:  Add a layer of geosynthetic fabric (reinforcement). Repeat until desired height is achieved.


What are the Benefits of GRS?

Publications:

Updated: 05/23/2012

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