| 单词 | cantilever arm |
| 释义 | > as lemmascantilever arm 2. In Bridge-building. A projecting support or arm of great length, two of which, stretching out from adjacent piers, are used to support a girder which unites them and completes the span; also attributive, as in cantilever arm, cantilever bridge, etc. ΘΠ society > travel > means of travel > route or way > other means of passage or access > [noun] > bridge > parts of pierlOE bridge foota1450 heada1450 staddling1461 foota1500 bridge end1515 jowel1516 causey1523 starling?c1684 rib1735 spur1736 icebreaker1744 jetty1772 cutwater1776 roadway1798 sleeper1823 water-breaker1823 centrya1834 stem1835 suspension-tower1842 cantilever1850 semi-beam1850 pylon1851 half-chess1853 span1862 sway-bracing1864 needle-beam1867 ice apron1871 newel1882 flood-arch1891 needle girder1898 sway-brace1909 trough flooring1911 1811 T. Pope Treat. Bridge Archit. (frontispiece) Flying lever bridge.] 1850 E. Clark Britannia & Conway Bridges I. 276 The semi-beam or cantilever has to support half the weight of the beam suspended from its extremity [At p. 44 ‘bracket arch’ is used]. 1867 B. Baker in Engineering III. 338 (Long Span-Bridges The cantilever girder of uniform depth in appearance is identical with the independent girder. 1882 American 4 70 A combination of two cantilevers with a central girder. 1887 Hazell's Ann. Cycl. 174/2 The main feature [of the Forth Bridge] will be the extraordinary spans, for a rigid structure, of a third of a mile in length, each of which is made by two cantilevers of 680 feet long, united by 350 feet of girder. < as lemmas |
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