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A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand , each of which requires specialized technology.
The decision whether to construct a tunnel using a TBM or using a drill and blast method includes a number of factors. Tunnel length is a key issue that needs to be addressed because large TBMs for a rock tunnel have a high capital cost, but because they are usually quicker than a drill and blast tunnel the price per metre of tunnel is lower. [ 2 ]
It is a rapidly growing sector of the construction and civil engineering industry. It can be defined as "a family of methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities."
A rotating cutting wheel is located at the front end of the shield. Behind the cutting wheel there is a chamber where the excavated soil is either mixed with slurry (so-called slurry TBM) or left as-is (earth pressure balance or EPB shield), depending on the type of the TBM. The choice of TBM type depends on the soil conditions.
Construction Data Company, is a publisher of business information which caters to the commercial construction industry. They are also known as CDC News and CDC Publishing , and are the third largest provider of commercial SaaS construction reports in the United States , next to Dodge Report and Reed Construction Data .
CMD Group, formerly Reed Construction Data and Construction Market Data, is a provider of business information for the North American construction industry. CMD is owned by ConstructConnect. Its historical roots lie in Construction Market Data, founded in 1982 to publish construction leads and market data.
Teesside Beam Mill (TBM) is a steel reheating and rolling plant located at Lackenby, on Teesside, North Yorkshire, England. The plant was set up in the 1950s by the Dorman Long company and began full production in 1958, making beams for building projects. The plant produces around 750,000 tonnes (830,000 tons) of steel products per year, and is ...
The Tuen Mun - Chek Lap Kok TBM otherwise known as Qin Liangyu or more formally, the Mixshield S-880 was the world's largest tunnel boring machine launched in June 2015 by Herrenknecht in Germany. [ 1 ] [ 2 ] The TBM was used to drill a 5 km tunnel connecting Tuen Mun to the Hong Kong International Airport , part of the Tuen Mun–Chek Lap Kok ...