| 单词 | rafter timbering |
| 释义 | > as lemmasrafter timbering rafter timbering n. now rare supporting timber in a mine or tunnel arranged like rafters in the roof of a house. ΚΠ 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 167 Rafter-timbering, timbering in which the pieces are arranged like the rafters of a house. 1907 M. M. Kirkman Building & Repairing Railways v. 114 in Sci. Railways (rev. ed.) The tunnel may be supported by rafter timbering, or..longitudinal bar timbering may be used. < as lemmas |
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