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  2. Shaft sinking - Wikipedia

    en.wikipedia.org/wiki/Shaft_sinking

    The modern shaft sinking industry is gradually shifting further towards greater mechanisation. Recent innovations in the form of full-face shaft boring [4] (akin to a vertical tunnel boring machine) have shown promise but the use of this method is, as of 2019, not widespread. [5]

  3. Herrenknecht - Wikipedia

    en.wikipedia.org/wiki/Herrenknecht

    Herrenknecht AG is a German company that manufactures tunnel boring machines (TBMs). Headquartered in Allmannsweier, Schwanau , Baden-Württemberg, it is the worldwide market leader for heavy TBMs. Established by Martin Herrenknecht in 1975, the company soon grew.

  4. List of military nuclear accidents - Wikipedia

    en.wikipedia.org/wiki/List_of_military_nuclear...

    The weapon detonated as planned at the bottom of a sealed vertical shaft 900 ft (270 m) below the Earth's surface, but the device's energy cracked the soil in unexpected ways, causing a fissure near ground zero and releasing a plume of hot gases and radioactive dust that continued for many hours, raining fallout on workers within NTS.

  5. Saint-Charles shaft - Wikipedia

    en.wikipedia.org/wiki/Saint-Charles_shaft

    The Saint-Charles shaft (or No. 8 shaft) is one of the main collieries of the Ronchamp coal mine.It is located in Ronchamp, Haute-Saône, in eastern France.In the second half of the nineteenth century, this shaft made it possible to mine large coal seams, contributing to the company's golden age.

  6. Water Lily Shaft - Wikipedia

    en.wikipedia.org/wiki/Water_Lily_Shaft

    The Water Lily Shaft near Eureka, Utah was dug during 31 days in 1921 and won a "World Champion Shaft Sinking" competition. It was drilled by Walter Fitch Jr. Company using Waugh Clipper Drills, and set a record of "427.5 feet of vertical, three-compartment shaft" being dug in a 31-day period.

  7. Shaft (civil engineering) - Wikipedia

    en.wikipedia.org/wiki/Shaft_(civil_engineering)

    In civil engineering a shaft is an underground vertical or inclined passageway. Shafts are often entered through a manhole and closed by a manhole cover. They are constructed for a number of reasons including: For the construction of a tunnel; For ventilation of a tunnel or underground structure, aka ventilation shaft

  8. Boring (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Boring_(manufacturing)

    A part's-eye view of a boring bar. Hole types: Blind hole (left), through hole (middle), interrupted hole (right). In machining, boring is the process of enlarging a hole that has already been drilled (or cast) by means of a single-point cutting tool (or of a boring head containing several such tools), such as in boring a gun barrel or an engine cylinder.

  9. Core drill - Wikipedia

    en.wikipedia.org/wiki/Core_drill

    This method greatly reduced the time required to drill a hole, and thus its cost, which increased the use of drilling and decreased the use of shaft sinking as a means of mineral exploration. It is also quite useful if there is a high risk of the hole walls collapsing when the drill tube is retracted, so it is suitable for most soil types, and ...