Page 117 - สะพานเครื่องหนุนลอย

11-9

ตารางที่ 11.1 Anchor Cable Requirements for Upstream Overhead system Reinforced Bridge Construction

(Wet gap) Number and Anchor Cable size in inches for stated maximum current velocities
Bridge Bridge 5 fps 7 fps 9 fps 11 fps

Span in feet type Single Dual Triple Single Dual Triple Single Dual Triple Single Dual Triple
M 4 3/8 3/8 3/8 3/8 3/8 3/8 1/2 3/8 3/8 1/2 1/2 3/8

200 Cl 60 and
M 4 T 6 1/2 3/8 5/8 5/8 1/2 1/2 3/4 5/8 1/2 7/8 3/4 5/8
M 4 1/2 3/8 3/8 1/2 1/2 3/8 1/2 3/8 3/4 5/8 1/2

400 Cl 60 and
M 4 T 6 5/8 1/2 1/2 3/4 5/8 1/2 1 7/8 5/8 1 1/4 1 3/4

M 4 5/8 1/2 3/8 5/8 1/2 3/8 3/4 5/8 1/2 7/8 3/4 5/8
600 Cl 60 and

M 4 T 6 3/4 5/8 1/2 1 3/4 5/8 1 1/4 1 3/4 1 1/2 1 1/4 7/8
M 4 5/8 1/2 3/8 3/4 5/8 1/2 7/8 3/4 5/8 1 7/8 3/4

800 Cl 60 and
M 4 T 6 7/8 3/4 5/8 1 1/8 7/8 3/4 1 3/8 1 1/8 7/8 (**) 1 1/2 1 1/8

M 4 3/4 5/8 1/2 7/8 5/8 1/2 1 3/4 5/8 1 1/8 7/8 3/4
1,000 Cl 60 and

M 4 T 6 1 7/8 3/4 1 1/4 1 7/8 1 1/2 1 3/8 1 (**) (**) 1 1/4
M 4 3/4 5/8 1/2 7/8 3/4 5/8 1 7/8 3/4 1 1/4 1 7/8
1,200 Cl 60 and

M 4 T 6 1 1/8 7/8 3/4 1 3/8 1 1/8 7/8 (**) 1 1/2 1 1/8 (**) (**) 1 3/8
* Based upon improves plow steel cable and2 percent initial cable sag.

** Unsafe Based on cable span equal to 1.1 times wet gap plus 100 feet.