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206
Valve Houses and Valve Chambers.
De-watering Pumps.
Valve Houses.
Valve Houses Roofs.
Lanterne.
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junction between the vertical walls and the invert. The brick and concrete work to be carried up to the levels shown on Drawing No. 8. The outside exposed surface, above low water level, to be faced with Granite Ashlar work corresponding to the adjoining sea wall and finished with heavy 24" coping blocks as shown, fine dressed on all exposed faces.
26. The valve houses will be octagonal, the rectangular structures below are to have the brickwork at the corners brought out to required distance by off set coursed stone work.
In both the valve chambers, 30° cast iron connections to be let through the wall with flanges built into the walls, so that the 18" pipes may be readily and easily inserted and a watertight joint made at the entrance of each. The connecting of pipe lines to valve chambers will require careful consideration, and the method of construction adopted to be approved by the Engineer.
Within the chambers, the pipes, valves, and other apparatus necessary to connect the 18" submerged pipes to the 24" pipes connecting to the land mains to be supplied and erected as on Drawing No. 7. Suitable access gangways to be erected in structural steel work, the beams being carried in the walls on bedstones, fine dressed on the faces, joints and beds. The flooring to be of cast iron plating carried on suitable bearers made so as to be easily lifted out and hinged access provided. The whole of the steel work in the valve chambers is to be galvanized.
27. In each valve chamber a Centrifugal Pump with Motor to be provided, and a delivery pipe erected and carried through the wall above high water level to discharge any water that may collect, and a provisional sum is to be included in the tender, for Kowloon chamber, 5 h.p. motor and 3 inch pump £180, and for Victoria chamber 6 h.p. motor and 3 inch pump £200, delivered f.o.b.
28. Valve houses, Drawing No. 8, are to be erected upon the valve chambers, the walls to be composite, the outer face of fine dressed Granite Ashlar with moulded cope and splayed base, the granite to be of light colour, specially selected by the Engineer, very finely dressed on all exposed faces, joints and beds, and have sufficient number of headers to secure the work into the wall. The inside face of wall to-be covered with white glazed brickwork upon a base course 12" deep of pressed blue bricks.
The interior of the wall to be filled in with fine concrete 4 to 1, and at four points through the centre of the wall 14′′ wrought iron galvanised bolts with anchor plates to be carried up and secured to a steel wall plate of angle iron. The whole to be solidly bedded and securely anchored down.
29. Erch roof to be formed of galvanized steel structural work (Drawing No. 10) expanded metal, all properly connected and constructed to provide a rigid structure and encased in 4 to 1 fine concrete. The concrete to be fine granite chippings or crushed granite and washed sand. The upper and under surface to be finished in fine concrete 2 to 1, worked and brought to a fine smooth surface. The overhanging eaves all round to be worked and throated to shed water. If necessary, drain pipes from roof lantern to be embedded in roof and made to discharge clear of building.
The structural steel work of the roof to be connected to a 7′′x31′′ angle wall plate with rafters of 4′′x5′′×4" tees and finished with a channel curbing 7"X3′′ at the top to form an opening to carry a lantern.
The whole roof must be thoroughly watertight and storm proof in every way
30. On the roof of each valve house a lantern to be provided secured to the channel curbing, constructed lighthouse pattern of cast iron base, brass lantern and copper dome and a provisional sum of £626 is to be provided for two lanterns manu- factured by Chance Bros. & Co., of Birmingham, and delivered packed f.o.b.
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31. A doorway to be formed into each house fitted with teak door and frame Entrances and and heavy brass fittings and fastenings, all of heaviest pattern from approved makers. Lights to Valve
Houses. Three lights in each house to be provided of circular ship porthole pattern
or other selected, very heavy glazing and suitable for the position, watertight and storm proof from Carron Co., or other maker. Prime cost of six lights, £120.
32. Provide in each valve house a set of lifting gear on an 8*x4′′ rolled steel Lifting Gear. joist built into walls on padstones, Drawing No. 8.
The lifting gear to be a Messrs. Herbert Morris Limited Chain block (No, 2479.
page 27 in Catalogue No. 84) or other approved for a working load of two tons.
33. Include a provisional sum of £100 for providing electric lights, switches, Lighting and lamps and wiring, also for connecting mains at both Kowloon and Victoria and con- Connecting Cables. necting to Electric Companies mains, as directed by the Engineer.
34. Include a provisional sum of £50 for strutting bracing or otherwise adequately Provision for supporting pipes in valve chambers as may be directed by the Engineer.
Strutting Pipes.
GANGWAYS.
35. Each valve chamber to be connected to the adjoining sea wall by steel work Gangways. gangways, Drawing No. 9, supporting the 24" connecting pipe, covered with galvanized cast iron plates properly secured and guarded with chain handrail. The ends of the girders to be properly built in both at the valve chambers and sea walls.
The entrance at the sea wall in each case to be protected by a lock-up unclimbable gate, Drawing No. 10, in two leaves with two supporting columns and wing pieces so as to prevent access to the gangway from the shore, heavy brass or galvanized fastenings and fittings and locks, the whole to approved details.
The gangways are either to be heavily coated with bitumastic compound, or protected, by approved process, from corrosion due to the proximity to sea water.
36. The Contractors may, with the consent of the Engineer, substitute for the Alternative structural steel work gangway, a reinforced gangway with girders, and platform of Gangways. reinforced concrete material obtained in the Colony, and constructed in the Colony.
The design, etc., must be submitted to, and agreed by, the Engineer.
37. At the two ends of the pipe line, the 24" pipe is to be laid, to levels shown. Connection through the sea walls, which will be cut through, pipe properly bedded on padstone through Sea Wall. and built in all round in cement, and coping properly replaced.
GENERAL.
38. The Contractors shall, at their own expense, provide and maintain all Pumping. proper and sufficient pumps and pumping appliances, and shall pump out or otherwise remove any water which from any cause whatever at any time, may be found in the pipes, valve chambers or other works.
The Contractors shall not allow any water to run over or rise behind any work until such work shall have set or become sufficiently hardened so as, in the opinion
of the Engineer, not to be injuriously affected thereby.
39. All materials supplied to be used on the Works shall be of the very best Tests. quality and capable of withstanding such test or tests as the Engineer or Inspector may direct to be made.
40. Provide the sum of One Thousand Pounds (£1,000) for such additional Provisional work as the Engineer may direct, this amount together with all other provisional Amount for
Contingencies. amounts or P.C. items required to be included in Tender will be deducted in whole or part if not required.
Works to be
41. The pipe line valve chambers and appurtenant works to be constructed Pipe Line and and left perfectly watertight, and the Contract sum shall be deemed to include any Watertight. further works which the Contractors may consider necessary, additional to those specified, or shown on the drawings.