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How Mega Tunnel are Made ? Heavy Dangerous Mega Tunnel Boring Machines Drilling Tunnel

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How Mega Tunnel are Made ? Heavy Dangerous Mega Tunnel Boring Machines Drilling Tunnel - Extreme Dangerous Biggest Mega Tunnel Boring Machines World's
A tunnel boring machine, 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.
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).
In order to avoid any damage to the sensitive buildings, subsidence, heave and vibrations must be avoided at all cost. In addition, the impact on traffic above ground must remain as small as possible. The S-442 is a classic EPB machine with an outer diameter of 12.06 meters and a total length of 95 meters. With its rotating cutting wheel, the tunneling machine breaks the material from the tunnel phase. The material is then transferred to the belt conveyer system in the rear of the shield via a screw conveyer while the hydraulic cylinders press the machine forward continuously.

The reinforced concrete segments, known as lining segments, are installed under the protection of the shield’s skin. When the ring building has been completed, the machine can push itself against the new tunnel ring and drill further into the soil.
What is the largest tunnel boring machine?
Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across. The machine was 326 feet (99 m) long and weighed 6,700 short tons (6,100 t).
Who invented the tunnel boring machine?
James Henry Greathead invented tunnel boring machine (TBM)

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