Tunnel Boring Machine (TBM)

tunnel boring machine (TBM), also known as a “mole”, is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can bore through anything from hard rock to sand. Tunnel diameters can range from one Howmetre (3.3 ft) (done with micro-TBMs) to 17.6 metres (58 ft) to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.

How much do tunnel boring machines costcost more than $45 Million USD. The 57.5 ft TBM used in the Seattle SR99 Project cost $80 Million USD (one of the largest TBM’s in use).

How does it go that fast Typically a Tunnel Boring Machine (TBM) can excavate about 50 or 60 feet per day on average with two or three shifts (~20 hours of excavation).Typically a Tunnel Boring Machine (TBM) can excavate about 50 or 60 feet per day on average with two or three shifts (~20 hours of excavation).
How much do tunnels cost per mileLight rail cost can go from as low as $ 42million per mile (surface) to as high as $400 million per mile if tunnel is involved (Toronto). The Baltimore Red Line had a total cost of $ 2.9 billion for 14.1 miles or slightly over 200 million per mile.

How much is the boring company worthForbes magazine estimates Musk’s net worth at $19.3 billion. The funding comes about five months after Musk said Boring Co would compete to fund, build and operate a “loop” to connect downtown Chicago with O’Hare Airport. Musk earlier sold Boring Co hats and flamethrowers to raise funds.

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