Torras Causeway MacKay River Bridge
About the Bridge
F.J. Torras Causeway is a four-lane paved road with a series of Bridges, It travels approximately 4.2 miles over a salt marsh and a series of five tidal rivers (west to east): a branch of Terry Creek/Dupree Creek, the Back River, the Little River, the Mackay River Bridges (part of the Intracoastal Waterway), and the Frederica River. It terminates on Gascoigne Bluff on the western edge of St. Simons Island. Prior to the construction of the Torras Causeway, the only way to reach St. Simons Island was by a ferry that left from a dock in Brunswick and arrived at a pier on the southern tip of the island. The causeway was reconstructed in 1949-50. In the mid-1980s, the causeway was widened from two to four lanes to accommodate the increase in traffic. The four bridges had to be rebuilt and reconstructed to carry four lanes of traffic in each direction.
Since construction of the bridge hair line and more visible cracks in support beams associated with the Mackay Bridge portion of the causeway had been reported during GDOT inspections. To better predict the remaining life expectancy of the bridge Cleveland Electric Labs (CEL) and ChM4 installed an all optical SHM System monitoring 24/7 with continuous live data with an automatic reporting system. CEL and ChM4 installed a series of XY crack sensors, strain and tilt optical sensors to evaluate whether the cracks are continuing to grow or has reached a stabilized growth pattern that will allow many more years of use. The bridge data evaluated was done by AECOM the Prime for the project.
Cleveland Electric Labs (CEL) X & Y Optical Crack Sensor
Model of bridge built used for pre-assemble of sensor system and location approvals. The model also used in the cloud SQL user interface software IntelliOptics®. A model is also shown used for crack monitoring developed by Cleveland Electric Labs (CEL) that gives you X & Y movements. This sensor is temperature compensated along with FBG sensors embedded in each beam and is all composite bodies so rust is no concern. This unit can be purchased with X,Y & Z movements as well, click here to see the installation details of the optical system for the following sensors. (1) Luna Interrogator and 8 channel multiplexer, (1) os3610 strain sensor, (2) os4350 temperature sensor for environmental purposes, and (98) CEL crack sensors or 49 sets to monitor crack growth.
IntelliOptics® structural health monitoring software, developed by ChM4 is a powerful, user-friendly interface that collects data from multiple sensor types and displays status information via one centralized program. Please CLICK on each page for a closer view. Also see our software section for more information and our Intelli-Insight® predictive analysis module for maintenance of critical structures.
ChM4 and Cleveland Electric Labs pictures of structural health monitoring installation of FBG optical sensors, XY crack sensors, temperature, strain, tilt sensors, control panels and software turnkey project. (tag images for close up)