148. At the airport, resheeting with a 1″ thick coat of bituminous macadam was applied to the works road, the hardstanding in front of the HAEC hangar and a portion of the taxi track. Part of the existing hardstanding area was rebuilt with 6″ of vibrated concrete plus a 1″ bituminous carpet.
149. Bridge No. 35 on Pokfulum Road just outside the City Boundary was widened in reinforced concrete to remove a dangerous traffic bottleneck.
150. At Lo Wu on the frontier, where the fence crossing the river had been washed away, a narrow 3-span reinforced concrete bridge some 84 feet long was built to carry jeep patrols and support the new frontier fence.
Reconstruction of Au Tau Bridge
4
151. Located near milestone 27 in the New Territories, the original Au Tau Bridge was partly demolished during the Japanese invasion. Further damage by heavy post-war traffic made reconstruction essential. The longest bridge in the Colony, the new structure of reinforced concrete has 11/25-ft. spans, an overall width of 36 feet and is simply supported on 18″ x 18″ R.C.C. piles. The piles were precast with 1:4½ vibrated concrete of maximum graded aggregate, rapid hardening cement and a water-cement ratio of 0.475. They were handled in 7 days and driven after 14 days with a 5-ton “Vulcan” single-acting hammer to a penetration giving a bearing capacity of 65 tons per pile from the Hiley formula. Pile driving was made difficult when rubble from the old demolished abutments was encountered. The carriageway consists of 4″ of bituminous macadam with a 1″ thick wearing coat on a 10″ deck slab carried by main deck beams 37″ deep. The two 5-ft. wide footways are surfaced with 2½″ of granolithic concrete. The railings are of fine punched granite.
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148. At the airport, resheeting with a 1′′ thick coat of bitu- minous macadam was applied to the works road, the hard- standing in front of the HAEC hangar and a portion of the taxi track. Part of the existing hardstanding area was rebuilt with 6" of vibrated concrete plus a 1" bituminous carpet.
149. Bridge No. 35 on Pokfulum Road just outside the City Boundary was widened in reinforced concrete to remove a dan- gerous traffic bottleneck.
150. At Lo Wu on the frontier, where the fence crossing the river had been washed away, a narrow 3-span reinforced con- crete bridge some 84 feet long was built to carry jeep patrols and support the new frontier fence.
Reconstruction of Au Tau Bridge
4
151. Located near milestone 27 in the New Territories, the the original Au Tau Bridge was partly demolished during the Japanese invasion. Further damage by heavy post war traffic made reconstruction essential. The longest bridge in the Colony, the new structure of reinforced concrete has 11/25-ft. spans, an overall width of 36 feet and is simply supported on 18" x 18" R.C.C. piles. The piles were precast with 1:41 vibrated concrete of " maximum graded aggregate, rapid hardening cement and a water-cement ratio of 0.475. They were handled in 7 days and driven after 14 days with a 5-ton "Vulcan" single acting hammer to a penetration giving a bearing capacity of 65 tons per pile from the Hiley formula. Pile driv- ing was made difficult when rubble from the old demolished abutments was encountered. The carriageway consists of 4′′ of 13" bituminous macadam with a 1" thick wearing coat on a 10" deck slab carried by main deck beams 37" deep. The two 5-ft. wide footways are surfaced with 21" of granolithic concrete. The railings are of fine punched granite.
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