Figure 52. Connecting unit (chain restraints and rubber bumpers) 

 used to attach modules of Alaska-type floating 

 breakwater (after Adee, (Q) 1975b). 



Private developers installed a floating concrete pontoon-type breakwater 

 to protect a marina at Embarcadero, Yaquina Bay, near Newport, Oregon. The 

 wave climate at this site is quite limited with a maximum fetch of about 1 

 mile. The water depth beneath the breakwater at low tide is about 20 feet 

 and a chain (diameter, 1-1/2 inches) connected to piles driven into the bottom 

 is used to secure the structure. The breakwater has had one problem which 

 occurred at the connections between the modules. The original installation 

 used eyebolts on each module, connected with a chain, and rubber tires as 

 bumpers between the modules. The failure of several eyebolts necessitated a 

 redesign of the connection. To correct this situation, holes were drilled and 

 steel reinforcing plates were installed in the concrete shell; neoprene- 

 covered wire rope was then installed through the holes (Fig. 53). The 

 redesign appears to have successfully corrected the connection problem. 



Figure 53. 



Connection redesign (consisting of wire rope through 

 reinforcing steel plates) for concrete pontoon units 

 (after Adee, (c) 1975b). 



92 



