Ii6 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



H.W. 



20 FEET 



FIG. 75. 



H.W.O.S.T. 



Buckey Dock and Harbour. 1 Figs. 75, 7G, 77, represent the 

 method adopted for the concrete walls, pier, and breakwater at 

 Buckey. The east pier has a somewhat novel appearance. The 

 work was tidal, but whilst the outer-wall foundations were dry 



at low water, the inner 

 wall was founded at 7 

 feet below low- water line, 

 and was carried out within 

 coffer-dams. 



To economize labour 

 on such tidal work, and 

 to expedite the progress 

 of construction, the inner 

 wall was built on piers 

 4 feet thick, placed so 

 that the clear span of the 

 arches was 20 feet. This 

 plan saved a considerable 

 amount of rock excava- 

 tion, and enabled the 

 work generally to be 

 much expedited, Figs. 

 75, 76. 



The framing for the 

 pier forming the break- 

 water founded at a depth 

 of 10 feet below low water, 

 and part of the west pier 

 founded at a depth of 

 7 feet below low water 

 of ordinary spring tides, 

 was erected in the follow- 

 ing manner : Horizontal 

 beams of timber 9 inches 

 square were bolted to 

 posts of the framing of 

 the last length of concrete built. These beams projected in the 

 line of the extension of the wall ; posts 9 inches square were then 

 erected 6 feet apart from centre to centre, and bolted to the 

 horizontal beams, and lined on the inner side with planking 

 1 M.r.I.C.E., vol. Ixx. p. 350 



Fia. 70. 



ELEVATION OF ARCHES. EAST 

 Fio. 77. 



