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  Delivery of a Complex Tunnel Package During the COVID -19 PandemicThrough

  As part of the Thames Tideway Tunnel, a Sprayed Concrete Lining (SCL) Connection Tunnel was required between the Carnwath Road Riverside (CARRR) Shaft and the west section of the Main Tunnel in a short period. This project presented some unique design and construction challenges, such as excavating near the buried TBM body, breaking through and excavating the existing tunnel, and changing the approved Potential Damage Assessments (PDAs) that had assumed the construction via TBM rather than SCL. All these complexities required many stakeholders to be involved in the process. Therefore, collaborative subsurface planning was crucial for delivering the design of the Connection Tunnel. Moreover, to meet the construction programme, the detailed design was largely progressed whilst the UK was in "lockdown" due to COVID-19, when many companies had reduced staff, and face-to-face meetings were no longer an option.

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