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单词 herringbone timbering
释义 herringbone timbering
[`her·iŋ´bōn ¦tim·bǝ·riŋ]
MINING ENGINEERING
A method of timber support in a roadway with a weak roof and strong sides, using neither arms nor side uprights; the crossbar is notched into the sides and supported at its center by a bar under it and parallel with the roadway; the bar is supported by struts notched into the sides at about half height.
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