Q 79
(3) Peak Road Service Reservoir.
144. This reservoir was completed during August under the contract with Messrs. Fook Lee & Co., the final amount being $51,927.40. The completion was delayed due to a large quantity of rock, and by a slip which occurred as a result of the heavy rain in April. The walls of the reservoir are of reinforced concrete cantilever design, 15 feet high with a maximum thickness of 18 inches. To secure a dense watertight concrete it was decided to vibrate the concrete in the walls and invert, internal vibration being used in the walls, and a vibrated tamping joist for the invert. On test no signs of leakage could be detected.
145. The reservoir has a capacity of 600,000 gallons at a T.W.L. of 750.00 A.P.D. and is divided into two sections by a division wall ten feet high.
(c) CROSS HARBOUR PIPES.
146. This work was referred to in paragraph 238 of last year's Departmental Report.
(1) Materials.
147. The pipes, which were supplied by Messrs. The Newport & South Wales Tube Co., are of 21" internal diameter, twenty-five feet long and made of 7/16" thick mild steel plate. One end of the pipes is fitted with a Victaulic ring, the other end being alternately long sleeve spigot and socket suitable for welded joints. On arrival in Hong Kong, the pipes were lined with centrifugally deposited cement mortar " thick and sheathed with vibrated cement concrete 21⁄4" thick, with a coating of protective paint. The spigots and sockets of alternate pipes were then welded together and the joint sheathed to form a composite length of approximately fifty feet. This work was carried out under contract by Messrs. The Hume Pipe (Far East) Ltd. and was completed in February, with the exception of the closing lengths. These were made up as soon as the necessary lengths were known.
(2) Preparation of Harbour Bed. Dredging.
148. Dredging operations, which were continued under the direction of the Port Works Office, were completed on the 18th June, and approximately 15,000 cubic yards of spoil were excavated by Government grab dredgers Nos. 1 and 2 assisted by one hired from Messrs. Sang Lee & Co., for a period of one and a half months. The poor output of the dredgers was due to the tough layer of boulder clay encountered which had to be loosened by a powerful jet of water before it could be removed by the available plant. Prior to the use of the water jet, attempts were made to loosen the boulder clay by blasting but the results were not satisfactory.
Formation of Bed.
149. The Netherlands Harbour Works Company, under the direction of the Port Works Office, completed the bed within 75 feet from Queen's Pier on the 15th May, when their contract was closed. During the year, 2,925 lineal feet of foundation mound was prepared and 725 lineal feet of protective mound constructed; 52 bearer blocks were manufactured and 185 were set to correct lines and levels. The mass concrete ramp at the Kowloon terminus was constructed and 3 R. C. piles 20 feet long manufactured.
The 75 feet section at Queen's Pier was carried out by Messrs. Woo Hing and included the setting of eight special blocks on the approach to Queen's Pier and the construction of a thrust block containing 80 cubic yards of Concrete at the level of -35.5 C.D. The whole of this work was completed during the month of September.
Q 79
(3) Peak Road Service Reservoir.
144. This reservoir was completed during August under the contract with Messrs. Fook Lee & Co. the final amount being $51,927.40. The completion was delayed due to a large quantity of rock, and by a slip which occurred as a result of the heavy rain in April. The walls of the reservoir are of reinforced concrete cantilever design, 15 feet high with a maximum thickness of 18 inches. To secure a dense watertight concrete it was decided to vibrate the concrete in the walls and invert, internal vibration being used in the walls, and a vibrated tamping joist for the invert. On test no signs of leakage could be detected.
145. The reservoir has a capacity of 600,000 gallons at a T.W.L. of 750.00 A.P.D. and is divided into two sections by a division wall ten feet high.
(c) CROSS HARBOUR PIPES.
146. This work was referred to in paragraph 238 of last year's Departmental Report.
(1) Materials.
147. The pipes, which were supplied by Messrs. The Newport & South Wales Tube Co., are of 21" internal diameter, twenty-five feet long and made of 7/16" thick mild steel plate. One end of the pipes is fitted with a Victaulic ring, the other end being alternately long sleeve spigot and socket suitable for welded joints. On arrival in Hong Kong, the pipes were lined with centrifugally deposited cement mortar " thick and sheathed with vibrated cement concrete 24" thick, with a coating of protective paint. The spigots and sockets of alternate pipes were then welded together and the joint sheathed to form a composite length of approximately fifty feet. This work was carried out under contract by Messrs. The Hume Pipe (Far East) Ltd. and was completed in February, with the exception of the closing lengths. These were made up as soon as the necessary lengths were known.
(2) Preparation of Harbour Bed. Dredging.
148. Dredging operations, which were continued under the direction of the Port Works Office, were completed on the 18th June, and approximately 15,000 cubic yards of spoil were excavated by Government grab dredgers Nos. 1 and 2 assisted by one hired from Messrs. Sang Lee & Co., for a period of one and a half months. The poor output of the dredgers was due to the tough layer of boulder clay encountered which had to be loosened by a powerful jet of water before it could be removed by the available plant. Prior to the use of the water jet, attempts were made to loosen the boulder clay by blasting but the results were not satisfactory.
Formation of Bed.
149. The Netherlands Harbour Works Company, under the direction of the Port Works Office, completed the bed within 75 feet from Queen's Pier on the 15th May, when their contract was closed. During the year, 2,925 lineal feet of foundation mound was prepared and 725 lineal feet of protective mound constructed; 52 bearer blocks were manufactured and 185 were set to correct lines and levels. The mass concrete ramp at the Kowloon terminus was constructed and 3 R. C. piles 20 feet long manufactured.
The 75 feet section at Queen's Pier was carried out by Messrs. Woo Hing and included the setting of eight special blocks on the approach to Queen's Pier and the construction of a thrust block containing 80 cubic yards of Concrete at the level of-35.5 C.D. The whole of this work was completed during the month of September.
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