Casting supporter used in the safety protect of bridge and road, each supporter has to take 8500kg load at least. 
The top of supporter have to take 9000kg load at least. 
Casting supporter is manufactured from a suitable steel casting for structure to JIS SC410, SC480 and nodular cast iron to JIS FCD450. 
Three tubes casting supporter can increase the visibility of landscape at driving. 
The casting supporter choice shall be compatible with engineering design.