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Contract No. DC/2007/16
Lai Chi Kok Transfer Scheme
The Lai Chi Kok Transfer Scheme (LCKTS) forms an integral part of the overall flood control strategy for West Kowloon to intercept the surface runoff at six locations from the hinterland north of Lai Chi Kok and provide a drainage tunnel discharge directly into Victoria Harbour near Stonecutters Island.
The key project features encompass 6 drop shaft intakes arranged on the Lai Chi Kok hillside to intercept storm water runoff and direct water into the 4.9m-dia Branch Tunnel constructed by using slurry TBM through mainly bedrock. The Branch Tunnel discharges into the Stilling Basin structure which is constructed below Butterfly Valley Road at the former Wai Man Tsuen. The 4.9m-dia Main Tunnel, also constructed by slurry TBM, comprises an inverted siphon with inlet Shaft M1 and outlet Shaft M2 adjacent to Victoria Harbour.
Atkins is commissioned by Leighton, John Holland JV to carry out detailed design including tunnelling shafts, goetechnical interpretation, traffic, utilities diversion, environmenatl and other civil and structural works design.
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Harbour Area Treatment Scheme Stage 2A Construction of Sewage System from Aberdeen to Sai Ying Pun (Contract No. DC/2007/24)
The Harbour Area Treatment Scheme (HATS) Stage 2A Sewage Conveyance System (SCS) has been proposed by the Drainage Services Department (DSD) to collect and convey the pre-treated sewage from eight existing Preliminary Treatment Works (PTW). These are located along the northern and south-western shorelines of Hong Kong Island, and ultimately connect to the Stonecutters Island Sewage Treatment Works (SCISTW) for treatment before final disposal into the western harbour via an existing submarine outfall. The construction contract has been split into two contracts, Contract No. DC/2007/23 and DC/2007/24.
Atkins is commissioned by the Contractor, Leighton LNS JV for the detailed design for temporary and permanent supporting system of five numbers, 10m diameters, 85m to 120m deep shafts and a 7.5km long, 4 to 5m span tunnel finally containing a pair of elliptical sewage conveyance ducts connecting the bottom of the shafts; and provide environmental and temporary traffic consultancy service for the project. The professional consultancy services provided for this project include skills on geotechnical, civil & structural, tunneling, transport and environmental aspects.
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Castle Peak Cable Tunnel
Atkins is responsible for the scheme design and construction supervision for the Castle Peak Cable Tunnel. This is a 4.5km long utility tunnel designed to house eight 132kV cables, and is being constructed between Castle Peak and Tsuen Mun, below mountainous terrain using a hard rock TBM. The internal diameter of the tunnel will be 4.5m. Precast concrete segments are being used as the tunnel lining. Due to the high rock cover and associated groundwater pressure, both drained and undrained linings are being utilised. The tunnel will pass through both granitic rock and the Tsuen Mun formation, which are separated by a large faulted zone. |
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Contract for CLP Power Tunnelling Projects Consultancy Services – Tsz Wan Shan Cable Tunnel
In March 2001 Atkins was awarded the consultancy services agreement for four cable tunnels by the CLP Power Hong Kong Ltd. Atkins provided preliminary and reference design, and construction supervision for these projects which were constructed under design-and-build contracts.
The 650m long, 3.2m I.D. Tsz Wan Shan Cable Tunnel was constructed using the same Bessac TBM as used for Tuen Mun Cable Tunnel. As the tunnel vertical alignment was selected to be above rockhead, the horizontal alignment was limited, with more than 80% of the alignment curved (minimum radius of 160m). |
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Contract for CLP Power Tunnelling Projects Consultancy Services – Tuen Mun Cable Tunnel
Tuen Mun Cable Tunnel was the second of the four design and build tunnels under the CPL Power Tunnelling Projects Consultancy. The scheme comprised a 3.2m I.D, 200m long constructed below Tuen Mun River . The Tuen Mun Cable Tunnel was constructed using a pressurized face “Bessac” TBM (3.79m O.D.) (subsequently used on Tsz Wan Shan Cable Tunnel). Ground conditions included soft clays with 20m of water pressure. The tunnel was lined with precast concrete segmental rings, concurrent with the tunnel excavation. Atkins provided preliminary and reference design, and construction supervision for this project. |
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Contract for CLP Power Tunnelling Projects Consultancy Services – Kwai Chung Cable Tunnel
The Kwai Chung project consisted of three permanent shafts, one temporary shaft and a tunnel. The 1000m long, 4.5m span tunnel was constructed by drill and blast from a number of faces. Temporary support was provided by shotcrete and rockbolts, with insitu concrete used for the permanent lining. Atkins provided preliminary and reference design, and construction supervision for this project. |
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Contract for CLP Power Tunnelling Projects Consultancy Services – Chi Ma Wan Tunnel
The Chi Ma Wan Cable Tunnel consists of a 3.3m diameter, 3200m long tunnel running from Tai Long to Pui Wo. The alignment passes below mountainous terrain, with cover above the tunnel in excess of 250m. The tunnel was excavated using a hard rock TBM. Pregrouting ahead of the excavation was carried out based upon the results of probe drilling. The tunnel was generally unlined, with support provided as dictated by the results of rock mapping. Support was permanent rock dowel, mesh and steel channels, with localized linings (incorporating permanent drainage measures and shotcrete) provided in a limited number of locations to ensure the permanent water ingress limits achieved. |
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Ma Wan and Kap Shui Mun Channels Cable Crossings
CLP awarded a design and build contract in April 2000 to Skanska International Civil Engineering AB (main contractor), supported by A J Lucas (HDD subcontractor), ABB (cable supplier) and Atkins (design consultant). The tender design proposed six HDD drillholes 550mm in diameter. The Ma Wan crossings (2 Nos.) are each 1,300m long. The Kap Shui Mun crossings (4 Nos.) are each 850m long. Atkins was responsible for the design of all civil works for the project, including design of the outer steel casings to resist both permanent and temporary loadings including pulling loads during installation. The design took into account the varying ground conditions along the route, including decomposed rock and potentially unstable fault zones. |
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Tolo Harbour Effluent Export Scheme
This Scheme was designed to reduce pollution in Tolo Harbour . Stage I of the scheme involved a 7.4km long gravity tunnel, constructed using a double shielded 3.56m diameter hard rock TBM, with precast segmental lining. The machine cut through hard granite at record speeds of 43m/day and 209m/week, exceeding that normally achieved by drilling and blasting. Atkins in association with Balfours International ( Asia ) Consulting Engineers Ltd. provided a full range of consultancy services for the project from planning and feasibility studies through detailed design and tender evaluation to construction supervision. |
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Underground Power Transmission System - Nam Fung Road to Mount Parker
This project was undertaken by Atkins to provide an underground power cable system for distribution of power from the Lamma Island power station to the eastern part of the Hong Kong Island . Works included constructing a cable tunnel through 5.4km of hard granite rock and 120m of soft ground, passing under Mount Nicholson , Mount Butler and Mount Parker . As the Geotechnical and Tunnel Consultant for this project, Atkins was responsible for the feasibility study, site investigation, design, design submissions and approvals documentation, tender evaluation, construction supervision and detailed tunnel logging and support installation. |
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Gas Pipeline from Braemar Hill to Wong Nai Chung Gap
This project involved the construction of a 2.6km long, medium pressure gas pipeline from Braemar Hill to Tai Hang Road , and an associated pressure reduction station. For environmental and other reasons, the pipeline was built within a 3.35m diameter bored rock tunnel for most of its length and a hard rock TBM was used for excavation of the tunnel. Atkins, in association with Acer Consultants (FE) Ltd., provided a full range of consultancy services for this project from planning and preliminary design through detailed design and tender evaluation to construction supervision. |
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