Firstly, there are three type ladders outside steel silo
1.Spiral ladder
2.Straight ladder
3.“Z” shape ladder

Secondly, see picture for spiral ladder. This picture shows the fabricate process of spiral ladder.
The fabrication step,
a.Use special fix connect with silo eage, tight it
b.Weld the foot board with special fix, to protect silo shell
c.Weld the safety fence

 

Thirdly, the advantage of spiral ladder
a.Save energy
b.More safety
c.Easy to fabricate