A 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.
www.PortofMiamiTunnel.com We Dig the Tunnel. . .The Community Can Too!
The advantages of tunnel boring : a qualitative/quantitative comparison of DB and TBM excavation by Peter J Tarkoy, PhD, Geotechnical and Tunnel Construction Consultant and James E Byram, PhD, Senior Research Scientist
First, reduce the tunnel diameter. The current standard for a one-lane tunnel is approximately 28 feet. By placing vehicles on a stabilized electric skate, the diameter can be reduced to less than 14 feet.
Trans-Planetary Subway Systems (Rand Corporation PDF)The first section of this page was written by Phil Schneider: Photo of United States Air Force tunnel boring machine at Little Skull
a sufficient distance. In other cases, the NATM is used to create a preliminary lining as the TBM progresses. Especially in cases where two TBMs dig toward each other from opposite ends of a tunnel, it may be too difficult or expensive to remove them when the digging is completed. As it n
A 150-ton tunnel boring machine breaks through on the Lemay Redundant Force Main in St. Louis, Mo. SAK Construction LLC, O’Fallon, Missouri, is the contractor.
NIAGARA TUNNEL PROJECT TECHNICAL FACTS . Last updated on November 21, 2012 VOICES from the Niagara Tunnel - A Living History (click link above for more information)
The first section of this page was written by Phil Schneider:. Photo of United States Air Force tunnel boring machine at Little Skull Mountain, Nevada, USA, December 1982.
Glossary. Abutment - the outermost end supports on a bridge, which carry the load from the deck. Aluminum - a lightweight chemical element (Al); the most abundant metallic element in the Earth's crust
KAMY series of Roadheaders offers the best cutting performance in a wide range of rock formations. Equipped with geometrically optimized transverse or longitudinal cutter heads, these flexible machines can be used to excavate subway tunnels, road tunnels, railway tunnels and water tunnels without using explosives.