For large diameter tunnels, the Tunnel Boring Machine features a smaller compartment ASME PVHO decompression chamber attached to it’s front face membrane. The size of these compartments varies, but all must contain sufficient space to seat employees and maneuver a stretcher in an emergency. Employees must undergo compression in order to service the cutting blade located at the front of the Tunnelling Machine, and then must be decompressed upon returning. Our PVHO decompression chambers are equipped with Quick Release Doors, which are designed and fully fabricated by All-Weld. Our Decompression Chambers have been operated in Canada, USA, Brazil, Portugal, as well as two used in the construction of the undersea Channel Tunnels between England and France.
