Plug for attaching objects to pre-stressed concrete cavity roof panels comprises sleeve with longitudinal slits at its upper end which is spread by cone with threaded central bore, into which bolt is screwed

摘要

The plug for attaching objects to pre-stressed concrete cavity roof panels comprises a sleeve (2) with longitudinal slits (4) at its upper end. A spreading cone (8) fits into this whose base has a diameter (D1) which is greater than the inner diameter of the sleeve and not more than its outer diameter. This has a threaded central bore (9), into which a bolt is screwed to spread the sleeve.