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Drawing on knowledge from across the company, over engineers were involved rringsted the project to deliver the multidisciplinary elements of the scheme. Segment joints are designed with locating dowels to facilitate high quality build ensuring good waterproofing performance and long term durability. One of the biggest challenges of the tunnelling works under central London was protection of the vast network of existing third party utilities, tunnels, structures, railways and historical buildings.
Tapered tunnel rings with 8 segments were designed to accommodate the minimum track alignment radius. Adding to the challenge, the scheme had to link into 14 railway networks and be completed within a tight timescale. The tunnels are lined withPrecast Concrete Segments.