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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.
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 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 ]
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.
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."
Its products have often pushed technological boundaries; a Herrenknecht-built TBM in the late 1990s was the largest in the world at that time, while the world's longest and deepest railway tunnel (the Gotthard Base Tunnel) was bored using the company's apparatus. By 2015, the company had around 5,000 employees.
In Tunnel boring machine (TBM) tunneling mechanical screening (scalping screener) is normally the first stage of the processing of tunnel rock. The screener removes rock particles below 16 or 20 mm diameter. This is to remove the high amounts of fines which is created when TBM tunneling in hard rock. Too much fines in concrete aggregates is ...
The Engineering News-Record (widely known as ENR) is an American weekly magazine that provides news, analysis, data and opinion for the construction industry worldwide. It is widely regarded as one of the construction industry's most authoritative publications and is considered by many to be the "bible" of the industry.