The side walls consist of a double row on each side of "Larsen" steel sheet piling containing an alloy of copper which is guaranteed to give a life of 80 years. The frame work of the terracing is constructed - of reinforced concrete Struts spaced 5 feet centre, formed to take the wood planking to receive the shores which Support and hold the vessels tu equilibrium on the keel blocks. The entrance to the dock is constructed with an extra heavy type of "Larsen" piling securely stiffened by channel trons and connected by 3" dia. ties carried back to a Iongitudinal system of anchor piles about 65 feet long. This piling connects with two strong boxes of heavy construction which form the entrance and which the caisson butts against effectively making a watertight joint.
"The flooring of the dock inside the entrance is of 6 inch and 4 inch pine, aid on 14 inches x 14 inches pine beams spaced 5 ft. centres. The beams are supported by round piles 14 Inches centre. diameter and having fa length of 38 ft. These circular pile: fare connected to the beams with heavy straps fitted over the beams and connected by bolts.
The entrance and sill are supported on reinforced conerete piles spaced about 4 fi. centres, and have a rolid foundation of concrete on top 4 thick to which is attached the 6 inch flooring.
The Dock Bottom The dock bottom has a camber of 8 Inches to allow water to. drain rapidly to sump and the dock bottom is constructed with a 6 inch rise The Calsson is fitted with an elec tically driven centrifugal pump having an 11 inches suction and dir charge.
The suction Is divided into two Inch pipes to enable the caisson 19. he kept level when being raised. This pump is directly connected to and driven by an electric motor of hop.
Two large sluice valves 48 inches diameter with steel pipes are fitted through the caisson, to unable the Aock to be flooded quickly. Th valves are operated from the tank eck, the operating wheels being fitted on bulb bearings.
The Caisson Is designed to be: ble. to float in a stable condition on a light draft to enable the dock to be used at any state of the tide.
The pumps installed are two: Vickers—Gill 29 inch Axial Flow Horlzontal Spindle Propeller pum rach delivering 21.700 Imperial ga jons per minute (8470 long tons per hour) against a total head of 27% ft when running at 720 rom. absorbing 382 lip. having an efficiency of 7 per cent. Each pump is direct counted to one "English Electric" A. G. S-1% Protected Type Slipring Induction Motor capable of developing 380 lip. at 720 rpm. wound for 3 phase, cycle, 400 volt supply. Atted with rush lifting and short circuiting device, The Drain Pump 'The dock drain pump is of the' Pulsometer Enaincering Co's Type "E10" Centrifugal Pump with 12 inch suction and 10 inch delivery branches to deliver 2.800 Imperial gallons per minute against a total head of 97% feet, absorbing 32 h.p. mounted an a cast' iron combination base plate. direct coupled -to an "Englich Flee ttle "LKS-17 Motor capable of developing 40 lip. at 720 rpm.
The pumps were supplied by the Jardine Engineering Corporation, Lid. The suction pipes of the lars: pumps are 40 inch dia. and discharge into a tank which has a main discharge pipe of copper steel 6 ft. la diameter which is laid well below the low water level and led to the river no gutterways being employed, s ie was considered a means of collecting mud and preventing a clean dry bottom.
The sump has been arranged and is 10 ft. wide and 4 ft. deep, vonstructed of steel sheet piling with the usual perforated steel plates to permit of ample flow of water to the pumps. Ladders on each side fic access to bottom of dock are hinges and tucked in behind the inner side of the entrance boxes. Slopes for the removal of heavy gear from vessels 'The lay out of the pump room well arranged and is contained in 9 steel tank placed at the lowest dept' possible.
'The pump house is a handsome ret brick Building, containing separate bhat and cold water baths for Officers and Men elaborately fited up with modern plumbing, with kitchens and. Store Room, elc, and operating, engineers' quarters." The boiler hous? fs situated at the head of the dock: and contains a large Scotch boiler, coal bunker and boiler attendants
Text read from the printed page and cleaned; old type leaves the occasional error.