| 摘要 |
<p>The metal chimney for industrial use has an internal flue conduit and a tubular sheath concentric with it. The sheath is of box-girder section comprising two concentric sleeves fixed to intervening struts (E) at the lower part of the chimney at least. the sleeve nearest the flue (C) can be formed by curved steel plates (T1, T2, T3) welded to the struts along their edges.</p> |
