| 单词 | raking prop |
| 释义 | > as lemmasraking prop raking prop n. Engineering an inclined prop used to support the curbs (curb n. 10) in the excavation of a tunnel, mine-shaft, etc. ΚΠ 1844 F. W. Simms Pract. Tunnelling ix. 86 For the insertion of each raking prop, a narrow space is first excavated from under the sill. 1875 J. B. McMaster Bridge & Tunnel Centres 81 The object in making some of these ribs without the tie beam is that, by so doing, the centring may be brought close up to the heading without interfering with the raking props. 1952 R. Hammond Civil Engin. Plant & Methods vi. 159 The two main cills [of the railway tunnel] are stayed by raking props. 1986 C. R. I. Clayton et al. Earth Pressure & Earth-retaining Structures (1993) xi. 272 The position of raking props should be checked, in order to ensure that potential failure surfaces..have a high factor of safety. < as lemmas |
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