HRBT UPDATES APRIL 2022
*Work is advancing on the tri-cell launch pit located on the South Island. Excavation in the launch pit will continue as the contractor continuously monitors and adjusts the groundwater elevations both inside and outside the launch pit. Excavating the launch pit on an island in the harbor is no easy task, and our project team is constantly adjusting to the conditions and requirements to ensure a safe operation. Shotcrete is applied as a substrate for waterproofing inside the TBM launch pit on the South Island.
*Assembly of the 46-foot diameter tunnel boring machine is underway on the South Island.
*Once complete, the launch pit will serve as a staging point for the Tunnel Boring Machine “Mary” and then launch her on her journey towards the North Island - creating the first of two new tunnels as she bores under the harbor.
* Work on the North Island is well underway with the expansion (almost doubled in size) to the island complete and the pile support structures for the new trestles being installed. Teams are still working to prepare the TBM (tunnel boring Machine) receiving pit.
25 апр 2022
