| 单词 | poling board |
| 释义 | > as lemmaspoling board poling board n. chiefly Mining and Engineering a board used to support the sides of an excavated structure. ΘΚΠ society > occupation and work > equipment > earth-moving and excavating equipment > [noun] > tunnelling equipment poling board1837 shield1837 packing-board1850 pilot tunnel1881 subterrene1956 mole1960 1837 Times 8 Aug. 6/6 The water..has penetrated the strata in the upper part of the excavation, and, accumulating in advance of the poling boards, has run into the shield at intervals with great violence. 1944 D. E. Warland Teach Yourself Constr. Details i. 10 With grounds of a loose nature, the poling boards are placed nearer together and horizontal timbers are used to support them. 1996 World Tunnelling (Nexis) 9 s5 Poling boards or boxes and breasting plates are being used as mechanical support. < as lemmas |
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