TBM TUNNELING

What is TBM Tunneling?

Tunnel Boring Machines (TBMs) excavate underground tunnels using a circular cross section (cutter head) to cut through and grind rock at the front of the machine which is then conveyed to the construction site at the rear of the machine. TBMs are able to grind through almost any type of rock.

Frontier-Kemper has constructed more than 70 tunnels across North America using hard-rock and soft-ground Tunnel Boring Machines, Road Headers, Shields, and other methods.

Why use TBMs?

TBMs limit disturbance to surrounding areas and produce a relatively smooth tunnel wall (reducing cost of tunnel lining).

CURRENT & RECENT TBM PROJECTS:
East Side Access Queens Tunnels
Seymour Capilano Twin Tunnels
University Link Light Rail Extension
South Platte Interceptor
Paradise Whitney Interceptor

TBM TRACK RECORD:

Miles Completed: 90 miles
Miles Under Construction: 1.9 miles
Years of Expertise: 31 years

TBM EXPERTISE:

  • Hard Rock Tunneling
  • Soft Rock Tunneling
  • EPB/ Earth Pressure Balance Tunneling
  • Mixed Shield/Slurry Tunneling
  • Microtunneling

TUNNEL LINING

  • Cast-in-Place Concrete
  • Pre-Cast Concrete Segmental
  • Steel
  • Shotcrete
  • Steel Supports & Rock Dowels
  • Grouting