Bridges are complex structures when built on land, and the challenges of construction and maintenance add up when parts of the bridge are built under water. Multibeam sonar surveys enable seeing the structures clearly also below waterline, which is important in every phase of the bridge’s life cycle.

Compare the as-built situation to plans

Multibeam sonar survey creates a 3-dimensional point cloud of the surveyed structure. Nowadays almost all the plans are also in 3D, increasingly BIM (Building Information Model) models. Scanning the construction in 3D enables comparison of the planned and built structure.


Detect risky structures and damages

Compared to traditional diving inspections, multibeam sonar survey gives more comprehensive picture of the underwater structures and the adjacent riverbed. Erosion around the foundation may not be noticed when diving near the structure, but it can easily be spotted when looking at the “big picture” of the bridge and its surroundings.

Verify the quality of construction

Whether you are building a totally new bridge or repairing the old one, it is important to verify the quality of work after the project. Is the structure as planned and the surrounding area cleaned from construction material? Update the as-built model to databases, if there has been changes to the plan during the construction. Also, when demolishing a bridge in the end of its life cycle, it is important to check the underwater for remaining material to ensure the safety of navigation or a new construction. A well-planned bridge maintenance requires a thorough knowledge of the condition of the structures.

VRT has a strong experience from different bridge structures with hundreds of inspections done, so just leave your details via the form below and we’ll get back to you the soonest!


Interested in our services? Contact us!

Karri Kolehmainen & Ville Mäkeläinen

Karri Koistinen

+358 40 0604927



Ville Mäkeläinen

+358 44 513 2222


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