… cores A couple of years ago, Construx designed a new type of adjustable moulds to produce any type of shaft or core without ties through the concrete element. The system is suitable to make single and double lift shafts, stair cores and box culverts. Since the first moulds have been installed in Belgium, three years ago, the worldwide demand for this type of mould has grown fast. Similar moulds have been supplied to Canada, New-Zeeland, United Kingdom, Germany, Northern-Ireland and many other countries.