Herrenknecht. Pioneering Underground Technologies . Three Different Shield Machine Types for Full Face Excavation. 1. open single shield for stable and usually non water-bearing ground conditions
Terminology. A tunnel is relatively long and narrow; the length is often much greater than twice the diameter, although similar shorter excavations can be constructed, such as cross passages between tunnels.
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Apart from cut and cover and blasting, Tunnel Boring Machine (TBM) is a commonly used construction method in building tunnels nowadays. The type of tunnelling method to be used depends on the specific geology of the project, tunnel length or diameter, logistical arrangements, environmental and other factors.
Each machine has a rotating cutterhead at the front and a series of trailers behind housing all the mechanical and electrical equipment. The TBM is effectively a large metal cylinder with a rotating cutting head at the front and conveyor belt at the back to remove the earth.
4/24 4.3 Preformed segments Preformed segments may be made of cast iron, steel or normal reinforced concrete. This type of lining usually comes with TBM or shield tunnelling
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
How do TBMs work? With a large rotating steel cutter head at the front of the shield, TBMs can pass through different types of soil, rock or mixture of both.
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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.