A joint venture of Sylmar-based civil construction firm Tutor Perini Corp. and its subsidiary Frontier-Kemper Constructors ...

They excavated the tunnel, lining it with 112,000 pre-cast ... lies ahead of us to complete the tunnels’ four ventilation ...

The Manhattan Tunnel Project scope ... along with an access shaft at 12th Avenue and the Manhattan West Side Highway, which will later become a ventilation facility for the tunnels.

The contractor will also be responsible for constructing an access shaft at ... into a permanent ventilation structure, and removing obstruction that could slow or damage the tunnel boring ...

Its angular silhouette stands out amongst the lazy contours of Colborne Moor, between Chapel-en-le-Frith and Edale. Investigating this structure, I discovered that it’s a ventilation shaft for ...