Page 21: of Marine Technology Magazine (April 2019)

Project @ a Glance

Customer Pro? le: Tappan Zee Constructors, LLC is a consortium – including Fluor Enterprises,

Inc., American Bridge Company, Granite Con- struction Northeast, Inc., and Traylor Bros., Inc. – that was hired to design and build the new Gov- ernor Mario M. Cuomo Bridge, one of the largest single design-build contracts for a bridge project in the United States. The project was started in

January of 2013 and, after a phased opening that started in 2017, the ? nal south traveling lanes were opened in September of 2018. De- construction work on the old bridge continues.

Business Challenge: The retired Tappan Zee

Bridge opened in 1955, and served more than 140,000 vehicles per day, far exceeding the amount it was expected to carry. The Tappan Zee

Constructors team was tasked with designing and constructing a new bridge to accommodate additional travel lanes (including bus and bicy- cle/pedestrian) and emergency shoulders and with safely demolishing the old bridge. Tappan

Zee Constructors reached out to the Measutron- ics Corporation and the Trimble Marine Con- struction team to improve productivity across the removal of the old bridge.

Solution: Trimble Marine Construction Software (TMC), Trimble precision GNSS receivers, Tele- dyne SeaBat T20 high resolution multibeam echosounder for marine imaging for subsurface applications

Accomplishments ? World’s ? rst application of real-time machine guidance for on-water cranes/excavators/ jack hammers, with sonar veri? cation: The system combines Trimble Marine’s position- ing, machine guidance and real-time visual- ization capabilities with Teledyne’s sonar ca- pabilities.

? Eliminated ‘working in the blind’: Safer, faster, more accurate dredging and demolition.

? Accelerated demolition and debris removal: ‘Bird’s eye view’ and precise accuracy show elevation, location, depth, bucket position and real-time 3D view of debris.

? Improved revenue capture with documenta- tion with ‘as-building’ capabilities: Multibeam sonar and image capture document bench- marks are met; plus identi? es ‘extra’ work www.marinetechnologynews.com

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