Rebate formwork system for slip form casting

C:\Interoovn\NRPortbl\DCC\EJL\1859725 I.doc-I0/06/2021 A formwork system for forming a rebate in the face of a core produced by slip form casting, the system comprising a rebate form comprising a rear part defining a hollow 5 interior and a forward part applicable to the rear part to close the hollow interior from the front, reinforcing bar couplers extending rearwardly from the rear part and engaged to the rear part by a threaded fastener passing into the coupler from the interior of the rear part, and a sealing strip extending along a rear face of the rear part and engaged by forward ends of the couplers to provide a seal against ingress of concrete slurry between the rear part 10 and the interior of the coupler.