- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
Timber over 4 in (10.2 cm) and less than 6 in (15.2 cm) in thickness and 8 in (20.3 cm) or over in width.
Industry:Mining
Timber support used in stopes to hold up the roof, consisting of a square frame of chocked round timbers and filled with waste rock.
Industry:Mining
Timber that has been sawed into boards, planks, staves, or other pieces of comparatively small dimensions. In mines, timber is used in the construction of coal chutes, mine cars, mine doors, forms for concrete structures, surface buildings, and for many other purposes.
Industry:Mining
Timber that has been treated either to make it flame resistant or to protect it from destruction by fungi and insects. Cover boards used with steel arches are often vacuumpressure impregnated with a flame-retardant preservative for safety and to comply with the flame-proofing requirements covering escape roadways.
Industry:Mining
Timbers braced against a wall as a temporary support. Also, the timbering used to prevent a sliding of earth adjoining an excavation.
Industry:Mining
Timbers of sufficient strength to support the roof of the tunnel. They are sometimes set upon sills and usually capped with short crosspieces.
Industry:Mining
Timbers placed along the sides of the track of a working place in rows on some predetermined plan.
Industry:Mining
Timbers set obliquely against pillars of coal to carry a plank partition, making a triangular air passage or manway.
Industry:Mining
