Construction Methodology for Cross Bay Link Sample Clauses

Construction Methodology for Cross Bay Link. 4.2.1 The major construction works would comprise the following activities: 4.2.2 No dredging works are envisaged for the construction of CBL. 4.2.3 Piling and pile cap construction would occur in three different sections for the Main Bridge, Eastern Approach and Western Approach. 4.2.4 Marine drilling rigs would be used for the installation of piles. One drilling rig to be used for the Eastern Approach foundations and one drilling rig to be used for the Western Approach as well as the Main Bridge foundations. There would be two marine piling fronts in total and the works undertaken in the following sequence. 4.2.5 A silt curtain would be placed around each foundation construction location to form the first line of defence against dispersion of sediment plume during pile, pile cap and pier construction. Steel sheet piling would be undertaken within the silt curtain to form a cofferdam and a second line of defence against dispersion of sediment plume during excavation of piles and construction of the pile cap. 4.2.6 Cylindrical steel casings (of the pile diameter) would be installed at each pile location within the steel sheet pile cofferdam. Excavation from within the cylindrical steel casing would be undertaken from the seabed level down to the pile founding level. The excavated materials would be transported from cylindrical steel casing by watertight closed-grab to a construction barge. 4.2.7 Following the excavation stage, a steel reinforcement cage would be lowered to the excavated void within the cylindrical steel casing. Concrete would then be poured by skipper to fill up the excavated void. The cylindrical steel casing would then be slowly retrieved by vertical pull during the concreting work. 4.2.8 For construction of the pile cap, temporary false work and formwork would be erected within the steel sheet pile cofferdam, the reinforcement placed into position and concrete would be placed to complete the pile cap. 4.2.9 This construction method would avoid the need to dredge sediment because the pile cap would be located above the sea bed. Sediment excavated from within the cylindrical steel pile casings would be placed in a barge and disposed in accordance with regulations. 4.2.10 ▇▇▇▇▇▇▇ ▇▇▇▇▇▇ would be used to transport steel pile casings to foundation locations and a crane would lift and place them into position. The pile casing would be installed using a hammer rig and the concrete would be supplied by another barge containing the concrete lorr...
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