Steel tube with circular cross section - has several,inner, longitudinally aligned. reinforcing plates supported against tube wall

摘要

The reinforcing plates (2,3), which adjoin each other in a frictional joint, form together a polygon seen in cross-section. Three plates can form an equilateral triangle, or six plates can form a hexagon. Each plate can have an obtuse angled edge such that the edges adjoin the tube wall. The tube can be galvanised. USE/ADVANTAGE - For spiral staircase metal supports, with the vibrations safely absorbed by the reinforcements.