Abstract: Slip form concrete laying machines for forming curbs are equipped with apparatus which forcibly inserts compressible sheets downwardly in the freshly laid concrete, the sheet being strengthened by a backing plate and an attached strip at its lower edge.
Abstract: Slip form concrete laying machines for forming curbs are equipped with apparatus which forcibly inserts compressible sheets downwardly in the freshly laid concrete and which prevents the spread of the curb as the sheet is inserted.