362 NOTES ON DOCKS AND DOCK CONSTRUCTION. 



and stones not less than 4 feet long, barked with rubble stone, 

 weighing from 2 to 3 tuns, set in 5-to-l concrete, coped with 

 granite stones 3 feet 6 inches wide by 17 inches thick, iu lengths 

 of not less than 4 feet, 151 2s. U. ; 139 4; 129 12s. Sd. ; 

 mean 140 19 6 



Ordinary quay wall founded on the boulder clay, consisting of concrete 

 foundation, freestone ashlar face backed with rubble stone, set in 

 5-to-l Portland-cement concrete, 116 5s. ; 101 Is. 6d. ; mean 108 16 3 



Quay walls on piles and concrete foundations, substituted for concrete 



cylinders 172 



Quay walls founded on sheet- and bearing-piles 144 8 3 



Albert Dock, Hull. 1 Cost of dock walls constructed of stone set in lias- 

 Itino mortar, including excavation below the dock floor level, 

 mooring-rmgs and ashlar blocks for the same, and all extras, per 

 lineal foot 19 9 



Quay Wall, Dublin. The cost of construction complete is given by Mr. Stoney as 



follows : 2 



Special Plant 



Diving-bell and barge 5,454 



Floating-shears 18,783 



Block wharf 4,610 



Cranes, concrete mixer and engine chain, testing machine, rails, trucks, 



weighbridge, moorings, stone-barge, etc. 5,000 



33,847 



Quay wall per foot run complete = to 16 cubic yards 



s. d. 

 Excavating and levelling foundation, including maintenance of bell and 



bell-barge 300 



Block standing on wharf, including all materials, suspender-bars, 



girders, etc. 16 



Lifting, transporting, and setting blocks, including maintenance of 



floating-shears, etc. 2 10 



Filling in side grooves in blocks with concrete 10 



Superstructure above concrete block, faced and coped with granite ... 11 2 

 Shifting moorings, maintenance of wharf, and sundries 100 



3i 2 



Interest on plant at 7 per cent., allowing 400 feet run completed per 



annum 5 18 6 



Total cost per foot run 40 6 



= per cubic yard of wall complete 200 



In some valuable articles in Engineering, on the subject of 

 concrete blocks and their cost, it is suggested that the probable 

 selling value of the special plant when done with should be 

 credited to the work in estimating the cost. 



It would appear reasonable, however, that works of this kin<l, 



1 M.P.LC.K, vol. Ixi. p. 113, 116. 2 Hid., vol. xxxvii. p. 344. 



