Shatin to Central Link (SCL) Cross Harbour Section Professional Forum II 4 th December 2009 22/06/2010 Page 1
Agenda Public Views To summarize the views sought in the consultation activities throughout the past months. The Preferred Scheme Westerly Alignment To update the design development of the SCL Cross Harbour Section. Extent of Reclamation To discuss the extent of reclamation. Q&A 22/06/2010 Page 2
Immersed Tube Tunnel - Alignment Envelope HUNG HOM STATION Existing Cross Harbour Tunnel Envelope for Cross Harbour Tunnel Options WESTERN ALIGNMENT CORRIDOR ENDORSED AT PROFESSIONAL FORUM NO.1 EASTERN CORRIDOR WESTERN CORRIDOR Central Wanchai Bypass (CWB) SLIP ROAD NO.8 EXHIBITION STATION 22/06/2010 Page 3
Public views Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 4
Consultation activities Major stakeholders in Causeway Bay Typhoon Shelter (CBTS) Private mooring users Anchorage area users Royal Hong Kong Yacht Club mooring users Buildings with sea water intake at CBTS Professional Groups Professional Forums Harbour-front Enhancement Committee Presentations to professional institutes (including CILTHK, HKCA, HKIA and HKIP) 22/06/2010 Page 5
Consultation activities (cont d) General Public District Councils Information Paper to all 18 District Councils Presentations to Wan Chai, Eastern, Yau Tsim Mong, North, Kwun Tong and Southern District Councils Public Forums at NT, Kowloon and HK Island Exhibitions Digest 22/06/2010 Page 6
Major views The majority of people agreed that there is an overriding public need for the SCL. Many people urged for its early completion. The finding that there is no reasonable zero reclamation option is supported. The vast majority preferred the Westerly Alignment in view of less impact to the Causeway Bay Typhoon Shelter (CBTS) and more direct route. 22/06/2010 Page 7
Other views Some stakeholders suggested that the SCL alignment should avoid passing through the CBTS. Some suggested that the CBTS breakwater should be relocated northward to provide more sheltered space such that the construction of the SCL within the CBTS could be expedited. Some suggested that the immersed tube tunnel method be adopted in the CBTS to reduce temporary reclamation. 22/06/2010 Page 8
Why Alignment Can t Avoid CBTS? Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 9
Alignment to North Point / Fortress Hill HUNG HOM STATION Fortress Hill / North Point Stations not capable of accommodating interchange passenger movements Existing buildings form barrier NORTH POINT Principal destination on north shore of Hong Kong Island FORTRESS HILL CENTRAL EXHIBITION STATION TIN HAU ADMIRALTY WAN CHAI CAUSEWAY BAY Constraint caused by Island Line capacity 22/06/2010 Page 10
Alignment to West of Existing Cross Harbour Tunnel No cross platform interchange with NIL Shared use of existing West Rail tunnel not possible due to capacity constraints Clash with Coliseum foundation Very deep alignment to pass under CWB tunnels Cross Harbour Gas Main Cross Harbour Tunnel SCL tunnels very deep to pass under Cross Harbour Tunnel in rock Very deep Hung Hom Station significant impact on East Rail to the north 22/06/2010 Page 11
Other Views Temporary breakwater Immersed tube extended into CBTS Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 12
Other Views TEMPORARY BREAKWATER For forming more sheltered space to north of CBTS Cannot be justified as It requires additional temporary reclamation; and Preferred scheme requires no additional moorings to be moved out of CBTS IMMERSED TUBE EXTENDED INTO CBTS Similar extent of mooring area affected A significant section of existing breakwater must be removed to float units into place 22/06/2010 Page 13
Part 2 Design Development Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 14
Cross Harbour Section SCL IMMERSED TUNNEL FAIRWAY Gas Main BRIDGE PROTECTION FENDERS SCL ALIGNMENT Cross Harbour Tunnel LIMIT OF DREDGING FOR IMT TUNNEL PROTECTION LAYER CBTS CUT & COVER SECTION IMMERSED TUNNEL SECTION CWB BREAKWATER IMMERSED TUNNEL SECTION CUT & COVER SECTION MARINE TRAFFIC FAIRWAY 22/06/2010 Page 15
Scheme Presented in Previous Forum Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 16
Westerly Alignment - Option 2 TS3(E) & TS3 (W) Completed Tunnel Tunnel Structure Completion of SCL from SVB 22/06/2010 Page 17
Westerly Alignment - Option 2 To be completed after CWB construction TS3(E) & TS3 (W) Completed Tunnel 22/06/2010 Page 18
Westerly Alignment - Further Opportunities for Earlier Completion Can works in this area be completed earlier? TS3(E) & TS3 (W) Completed Tunnel 22/06/2010 Page 19
Westerly Alignment - Further Opportunities for Earlier Completion Requirements for Earlier Completion Need to provide sufficient navigation channel and work space in CBTS Proposed revised temporary reclamation and mooring arrangement have to be accepted by concerned stakeholders Some additional moorings (compared to CWB) may need to be relocated outside CBTS Timely authorization of SCL 22/06/2010 Page 20
Developments Since Previous Forum Hung Hom Landfall Essentially as presented at Forum No.1 Causeway Bay Typhoon Shelter Extensive liaison on integration with Central Wanchai Bypass Extent of SCL works to be carried out by CWB agreed Discussion with Stakeholders, Marine Department and Highways Department on Marine construction access Mooring provisions Mitigating impacts on RHKYC operations 22/06/2010 Page 21
Causeway Bay Typhoon Shelter - Further Option development 22/06/2010 Page 22
SCL Works to be Constructed Under CWB Project SCL Tunnel by SCL Project SCL Tunnel by CWB Project To Hung Hom Station Existing Permanent Seawall Proposed Extent of SCL Tunnel to be Constructed by CWB Area of Temporary Reclamation Left by CWB Project at End of Stage 2 Police Officers Club / SVB Approx.160m Shatin to Central Link Causeway Bay Typhoon Shelter Central - Wan Chai Bypass (CWB) Original TS4 Revised TS4 Temporary Seawall to be Constructed after the Authorization of SCL Project Victoria Park Road 22/06/2010 Page 23
SCL Works with Causeway Bay Typhoon Shelter With CWB Stages 1 & 2 At End of CWB Stage 3 CAUSEWAY BAY TYPHOON SHELTER CAUSEWAY BAY TYPHOON SHELTER CWB TUNNEL LEGEND COMPLETED TUNNEL BY CWB BY MTRC TEMPORARY SEAWALL With CWB Stage 4 Following CWB Completion Final SCL Section Completed 18 Months After CWB Works CAUSEWAY BAY TYPHOON SHELTER CAUSEWAY BAY TYPHOON SHELTER CAUSEWAY BAY TYPHOON SHELTER CWB TUNNEL No additional moorings to be relocated out of CBTS Exploring potential for previously affected PMA moorings to return to CBTS on completion of CWB works 22/06/2010 Page 24
Minimising Reclamation - Causeway Bay Typhoon Shelter Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 25
Temporary Reclamation at Causeway Bay Typhoon Shelter Existing breakwater to be removed and then rebuilt after tunnel construction completed Temporary seawall cope line Temporary piles required for reprovisioning of Royal Hong Kong Yacht Club operating jetty. (Exact location to be agreed with the Yacht Club) Temporary rock bund to provide transition between temporary seawall / breakwater wall and existing breakwater Temporary wall Temporary seawall cope line Interface between CWB and SCL temporary reclamation 22/06/2010 Page 26
Cross Section to North of Breakwater Temporary reclamation width 62m (Approx.) 20m (approx) 20m (approx) Reinstatement to existing seabed level after tunnel construction completed Sea level Original sea bed Dredge level SCL Tunnel Temporary wall 22/06/2010 Page 27
Construction through Breakwater Stage 1 Causeway Bay Typhoon Shelter Temporary seawall Existing breakwater Causeway Bay Typhoon Shelter 92m approximately Cut-and-cover tunnel Immersed tube tunnel Mean sea level Existing CBTS North Breakwater Infill with mass blocks (no dredge) C&C tunnel to be constructed Temporary seawall Temporary wall 22/06/2010 Page 28
Reprovisioning of Royal Hong Kong Yacht Club Operating Facilities REPROVISIONED RHKYC FACILITIES TEMPORARY JETTY (POSITIONING TO BE AGREED WITH RHKYC) 22/06/2010 Page 29
Minimising Reclamation At Hung Hom Landfall Introduction Line 1 (Myriad MM Regular pt. 22, Line Spacing pt. 28) Introduction Line 2 Introduction Line 3 22/06/2010 Page 30
Hung Hom Landfall Cut & Cover Tunnel To Hung Hom Station 20m approx. 93m approx. 20m approx. International Mail Centre Hung Hom Bypass Temporary works area Freight Pier Cut-and-cover tunnel 20m approx. 62m approx. 20m approx. Immersed tube tunnel 22/06/2010 Page 31
Temporary Reclamation at Hung Hom Longitudinal Section Fill and armour protection layer on tunnel to match IMT Extent of cut-and-cover section dictated by requirement to avoid underwater blasting of rock Cut-and-cover section Existing seawall to be removed and rebuilt Rock head Proposed SCL track level Existing fender pile to be removed and rebuilt after construction 22/06/2010 Page 32
Realigned Fender Piles NEW FENDER PILES EXISTING FENDER PILES PILES TO BE REMOVED HUNG HOM BYPASS FENDER PILES TO BE REINSTATED REALIGNED FENDER PILES 22/06/2010 Page 33
Reinstatement of Freight Pier To Hung Hom Station International Mail Centre Hung Hom Bypass Freight Pier Part of freight pier to be demolished 22/06/2010 Page 34
Summary Reclamation Requirements PERMANENT Relocated fender piles TEMPORARY HUNG HOM STATION Hung Hom landfall Relocated fender piles LOCATION APPROXIMATE AREA Hung Hom Landfall 1.0 Ha Causeway Bay Typhoon Shelter/ Adjacent to Breakwater Royal Hong Kong Yacht Club Jetty 2.2 Ha RHKYC jetty CBTS EXHIBITION STATION ADMIRALTY STATION 22/06/2010 Page 35
Conclusions There is a clear and present need for the SCL to cross the harbour This should follow the Western alignment parallel to the Cross Harbour Tunnel Construction will be by Immersed Tube / Cut-and-cover methods Reclamation will be required but this has been minimised 22/06/2010 Page 36
Way Forward Complete Cogent and Convincing Materials Report Gazette the SCL upon completion of the preliminary design and first round of public consultation Continue liaison with key interfacing stakeholders 22/06/2010 Page 37