KCRC West Rail Contract No. CC-402

CLIENT -Canton Railway Corporation

CONTRACTOR Balfour Beatty - Zen Pacific Joint Venture

CONTRACT VALUE HK$3,334 million

CONSTRUCTION PERIOD October 1999 to October 2003

MAJOR WORKS CONSISTED OF :

- Construction of Nam Cheong Station with a footprint of approximately 36,000m 2 and gross floor area of 63,000m 2. The height of the station structure is approximately 19m above ground level and the depth of the station structure below ground level is approximately 12m. Major materials consisted of 400,000m 3 of concrete, 83,000 tonnes of reinforcement, 795,000m 2 of formwork with more than 1000 piles/barrettes required. The structure envelopes the alignments of the existing elevated Expressway (WKE) and the existing Airport Express Line (AEL) together with the existing MTR Line (TCL) all of which remained operational during the construction period.

- Construction of a pedestrian underpass within the station structure; - Construction of 4,770m of Roads which incorporated a 318m of viaduct, reinforced concrete bridges and retaining walls.; - Construction of approximately 554m of twin cell, 30m of single cell reinforced concrete box cut and cover railway tunnel constructed on 450 nos. of piles. - Construction of two temporary steel footbridges and demolition of two existing reinforced concrete footbridges; - Installation of approximately 334m of 2100mm diameter pipe culvert along the western side of the existing YC2 Culvert; - Construction of a PTI to serve Nam Cheong Station and modification works to the existing temporary PTI at site 6. - The contract also included Electrical & Mechanical works valued $415 million and ABWF works valued $ 275M.

HIGHLIGHTS:

The Nam Cheong Station is the southern terminal of the West Rail. It is an interchange station for the West Rail and the MTR . The structure envelopes the alignments of the existing elevated West Kowloon Expressway (WKE), the existing Airport Express Line (AEL) and the MTR Tung Chung Line. It also included the linking carriageway and the associated elevated flyover system. During the construction stage, the West Kowloon Expressway (WKE), the Airport Express Line (AEL) and the Tung Chung Line have to be operated normally. These requirements greatly enhance the difficulties in the construction. Therefore, the requirement in terms of construction technique was extremely high and stringent.

This station includes the track side platforms at ground level and an underground station hall for both the West Rail and the MTR Tung Chung Line. The underground station hall was constructed underneath the operating Airport Express Line (AEL) and the Tung Chung Line. In order to ensure the operation of the Airport Express Line (AEL) and the Tung Chung Line, “Top down” construction method was employed. Application of this kind of construction method in such a scale are seldom seen in .The underground station hall and platform design ensured the utilization and development of the underground space, reduced occupation of area at ground level. It also provided a grand outlook of the station structure. Apart from providing business activities, with the highly efficient pedestrian flow design, the crowds are quickly diverted to the relevant Airport Express Line station, bus station, residential blocks and commercial areas.

The column, beam structure and foundation design of the station has made provisions for the future development of multi-storey residential blocks on top of the station. The foundations design includes large diameter cast in-situ concrete bored piles, diaphragm walls and driven steel H-piles, etc. During the construction of the station, reinforced concrete column structures were reserved at the roof slab of the station for the future construction of the multi-story resident blocks. The multi-story shear walls of the future superstructures will be supported by the transfer plate at the station roof. This provides a flexibility to accommodate any future change in the layout of the superstructure.