Data Management
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The Challenge
- Instrument the Central Artery Tunnel
- Monitor during construction
Canopy by Hilton Hotel on 111 North Street in Boston, MA was a $125 million project joint venture between CV Properties, Harbinger Development and Olshan Properties.
In addition to the hotel, the project also includes 12,711 square feet of retail and restaurant space. Portions of the building are built above a very sensitive structure: the Central Artery Tunnel that carries I-93 beneath downtown Boston.
The Solution
Geocomp provided real-time monitoring during construction of the hotel above the tunnel. The final design for the hotel called for a portion of the structure’s weight to be carried by the existing tunnel roof girders.
During excavation of the soil above the tunnel and subsequent backfill and vertical construction, the tunnel roof girders were expected to deflect upwards as the soil load was removed, and then settle as the foundation elements and structural load related to the building were added. Geocomp actively monitored the ceiling and walls of the tunnel to ensure that the actual measured deflections did not exceed the specified design criteria. An automated motorized total station (AMTS) was installed prior to construction to monitor the tunnel walls.
In addition, Geocomp designed a customized liquid-level monitoring system specific to the project. The liquid level system was installed to measure the deflections inside certain confined spaces in the ceiling of the tunnel where the AMTS was unable to monitor.
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