| 单词 | roof bolt |
| 释义 | > as lemmasroof bolt roof bolt n. a bolt for attaching something to or securing a roof; esp. (Mining) a tensioned rod anchoring the roof of a working to the strata above; cf. rock bolt n. at rock n.1 Compounds 2a(a). ΘΚΠ society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > bolt > types of round bolt1582 ringbolt1599 pikebolt1622 rag bolt1625 set-bolt1627 clinch-bolta1642 eyebolt1649 clinch1659 screw-bolt1690 king bolt1740 wrain-bolt1750 wraining-bolt1769 toggle-bolt1794 strap-bolt1795 wring-bolt1815 through-bolt1821 truss-bolt1825 slip-stopper1831 stud bolt1838 anchor bolt1839 king rod1843 joint bolt1844 spade-bolt1850 shackle-bolt1852 roof bolt1853 set-stud1855 coach bolt1869 truss-rod1873 fox-bolt1874 garnish-bolt1874 fang-bolt1876 stud1878 U bolta1884 rock bolt1887 hook bolt1899 tower bolt1911 explosive bolt1948 1853 H. Haupt Bridge Construct. ii. 222 30 roof-bolts 36 inches long ¾ inch diam. 1901 Locomotive Mag. Apr. 75/1 The bars are put on and attached by the roof bolts being screwed into them. 1950 Sci. News Let. 9 Sept. 174/3 Roof bolts, which replace in part the pillars of earth or timbers to support the roof after ore is removed, are steel rods driven into the roof either vertically, or at an angle to hold the layers together. 1955 Trans. Inst. Mining Engineers 114 849 Roof bolts cannot be used to replace normal supports at the face, but they have been used..to bolt weak immediate beds together or to stronger beds above. 1994 Guardian 27 July i. 2/7 The use of cost-saving roof bolts..was a factor in the roof fall which caused the deaths of three miners last year. < as lemmas |
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