Model Number

Thickness-Diameter Ratio

Concrete Strength Grade

Thickness of Inner Steel Plate/mm

Thickness of Outer Steel Plate/mm

S-1

0.2153

C60

15

10

S-2

0.2153

C70

25

15

S-3

0.2153

C80

35

20

S-4

0.2461

C60

25

20

S-5

0.2461

C70

35

10

S-6

0.2461

C80

15

15

S-7

0.2769

C60

35

15

S-8

0.2769

C70

15

20

S-9

0.2769

C80

25

10