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Geocomp deployed their iSite data logging system along with the iSiteCentral web-based data management program to deliver data to the engineer on a real-time basis 24/7.
S.R. 65 Bridge Piers Underpinning
Over two weekends in March, the existing supports under the S.R. 65 North and South approaches to Ft. Duquesne Bridge were cut away, allowing the load transfer of the highway structures above to new supports. The old supports had to be removed to make room for the new light rail tunnels.
Geocomp engineers and technicians were on-site for 24-hour shifts monitoring the piers while the load was transferred from the old supports to the new supports using a complex post-tensioning process. Any movement greater than 6 mm would trigger an alarm and work would immediately be halted. The measured movements were less than 3 mm, and the work proceeded without incident. Martin Hawkes, a project manager for Geocomp, marveled at how smoothly the entire operation progressed. Martin took this dramatic photo of the nighttime work. 
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Worker cutting through an old support under S.R. 65. Above the worker, four reflective prisms connected to the left pier (yellow) are visible. An automated total station was trained on the prisms, and real-time data collected from these targets were constantly monitored. Once all the old supports were cut, the load was transferred to the new supports. One of these new supports is located to the right of the worker.
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