mechanical members and includes the sus- 

 pension assembly, the torque tube and cables, 

 and the track. 



Suspension system . --To obtain a supporting 

 structure that could be installed readily on a 

 wide channel without need for expensive piers 

 in the water, a suspension system was used. 

 The main system (fig. 3) consists of a single 

 28.1-mm. diameter preformed steel cable with 

 six strands, each composed of 19 wires. This 

 cable is suspended a distance of 34.7 m. be- 

 tween two support towers, 4.9 ni. high. The 

 towers on both banks are constructed of 

 15-cm. standard weight pipe. Backstays of 

 wire rope, extending out and in line with 

 the traveling screen, assist in holding the 

 support towers in a vertical position. Addi- 

 tional support is provided by transverse wire 

 ropes extending perpendicular to the direction 

 of the main cable. Each of these side cables 

 (fig. 2) is attached on the ground to a concrete 

 anchor. 



Torque tube and cables . --The torque tube 

 (fig. 4) functions as a stiffener element to 

 minimize deformation of the cable from moving 

 loads or nonuniform water pressures. It is 

 formed of 7-gage steel, 20.3 cm. in diameter, 

 and runs directly below the main cable from 

 tower to tower. 



I 5-cm. e STO WT PIPE 

 fSUPPORT TOWER) 



X 63-cm.X 91-cm. 

 SHELBY TUBE 



2.5-cin.PLATI 



25-C(i\ X38-cm. 

 PLATE 



Figure 4. — Connection detail for torque tube and 

 support tower. 



The torque tube is given vertical support at 

 6.1-m. intervals by 9. 5-mm. suspender cables. 

 Turnbuckles in the suspender cables provide 

 for adjustment of the vertical alignment of 

 the torque tube. Horizontal and vertical loads, 

 imposed on the track support assembly by the 

 walkway and screen, are carried by the torque 

 tube (fig. 5). The torque tube is therefore 

 subjected to shear, torque, and bending. Side 

 cables and torque cables form a couple to 

 oppose these forces. 



The side cables extend horizontally from 

 each side of the torque tube at 6.1 -m. intervals 

 to anchors on the shore. These cables take 



, SUSPtNSION CABLE 



SHEAVE 



BOTTOM OF CANAL 



Figure 3. — Typical section of traveling screen deflector. 



8 



