stepped riser with sandwich plate.

摘要

A stepped riser (4) comprising a sandwich structure having upper and lower metal sheets (10, 11) and an intermediate layer (12) of a plastic material or polymer bonded to said metal plates to transfer shear forces therebetween, characterized in that said upper plate has a thickness ranging from 2 to 10 mm, said bottom plate has a thickness ranging from 2 to 10 mm and said intermediate layer has a thickness ranging from 10 to 100 mm.