Patent ID: 8647542

Claim:
A method of forming a rebate in a surface of a slip cast core with at least one cast-in ferrule opening into the rebate for receiving a reinforcing or fastening element, said method using a formwork system, the formwork system comprising: a ferrule having an interior passage; a rebate form, and at least one ferrule support carried by the rebate form, wherein the ferrule support comprises a finger, the finger projects from an inner face of the rebate form and the finger is received within the interior passage of the ferrule to engage an internal surface of the interior passage of the ferrule to provide support for the ferrule along the interior passage of the ferrule during casting of the ferrule into the core; and wherein the finger is axially withdrawable from the interior passage of the ferrule after casting by a withdrawal of the rebate form from the core in an outward movement perpendicular to the face of the core thereby exposing an outer end of the ferrule which opens onto the rebate to receive a reinforcing or fastening element; said method comprising: attaching the rebate form to a slip form or reinforcement, with the ferrule support carried by the rebate form; pushing the at least one ferrule onto the finger of the ferrule support so that the finger is received within the interior passage of the ferrule to engage the internal surface of the interior passage of the ferrule; casting the ferrule into the core with the finger providing support for the ferrule along the interior passage of the ferrule during said casting; and after said casting, withdrawing the rebate form from the core in an outward movement perpendicular to the surface of the core, thereby exposing the outer end of the ferrule which opens onto the rebate to receive the reinforcing or fastening element, wherein said withdrawing axially removes the finger from the interior passage of the ferrule without destroying the ferrule support.