The successful completion of a second 5-mile tunnel by HS2 near Greenford, west London, indicates progress in the Northolt Tunnel project, entirely spanning 8.4 miles. Four tunnel boring machines (TBMs) are digging, with significant engineering techniques applied due to high groundwater pressure. The TBMs maintain pressure through a special 'reception can' during breakthrough, preventing water ingress. Named after 18th-century astronomer Caroline Herschel, TBM Caroline recently reached its breakthrough milestone while community involvement further enhances the project’s local significance. With 93% of the tunnel completed, HS2 is also focused on the sustainable reuse of excavated materials.
The completion of a 5-mile railway tunnel underneath west London marks a significant milestone for HS2, showcasing the advanced technology of tunnel boring machines in the project.
Due to high water pressure, HS2's unique 'reception can method' is utilized to protect machines and maintain pressure during the breakthrough, highlighting the engineering challenges faced.
TBM Caroline, named after astronomer Caroline Herschel, is the second of four tunnel boring machines to complete its 5-mile journey, underscoring community involvement.
As of now, 93% of the Northolt Tunnel is built, with excavated London Clay being repurposed effectively, reflecting the project’s commitment to sustainability.
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