Page 284. In conjunction with the bridge construction the opportunity was taken to realign and regrade the roadway on either side for a total of 3,100 feet. All curves were widened, transitioned and superelevated to conform with a design speed of 35 miles per hour whilst all changes of grade were introduced by parabolic vertical curves. The standard two-lane carriageway width of 22′-0″ with 5′-0″ wide footways and bus parking bays were provided. A flexible surface of bituminous macadam on rock bottoming was provided on newly filled sections of the road whilst the remainder was constructed in 8″ thick vibrated concrete with a 1″ wearing coat of 3″ premixed bituminous macadam supplied by the Government Quarry in Kowloon.
Work on the project was commenced on 26th May and the bridge and approaches were completed by the end of the year.
Page 285. Quarrying, crushing and screening of Hong Kong granite continued throughout the year at Hok Un Quarry (Mainland) and at Tsat Tze Mui Quarry (Island). Both plants were operated by the Roads Office and they supplied the bulk of the Department's needs for crushed stone of all sizes and bituminous macadam.
286. At both Quarries the rock was produced by benching, with secondary blasting for reduction of larger boulders. The explosive used was Gelignite 62% N.G. and the yield of rock per pound of explosive including both primary and secondary blasting averaged 6.09 tons.
287. Before being fed to the primary crushers the rock was hand broken to 8″ or 12″ spalls by stone breakers using spalling hammers. It was then loaded by coolies into 27 cu. ft. steel side tipping wagons on 24″ gauge light railway track and pushed to the primary crushers.
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