Compressed nitrogen used to slide subway into place

Compressed nitrogen used to slide subway into place :In Rochester, United Kingdom an 800 tonne reinforced concrete underpass was installed using air jacks filled with compressed nitrogen. The 28 m long, 7.6 m wide and 4 m high box was installed between 18-21st April in an existing railway embankment. The liquid nitrogen in the air jacks helped to lift the structure while hydraulic rams pushed it into place

Compressed nitrogen used to slide subway into place

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