Causeway Bay Typhoon Shelter Yy Yp

Central-Wan Chai Bypass and Island Eastern Corridor Link - Causeway Bay Typhoon Shelter (Contract No. HY/2009/15)

Tim Leung

Singapore – 11 November 2016 Mr. Tim Leung Client

Highways Department, Hong Kong Government Engineering Firm

AECOM Asia Co. Ltd . Contractor

China States Construction Engineering (Hong Kong) Ltd.

2 Singapore – 11 November 2016 Contract Information Overall Cost for Tunnel Civil Works Cost: € 614 million (HK$ 5.37 billion)

Length of Drive: Mined Tunnel = 167 metres Cut-and-Cover Tunnel = 598 metres

Duration: 27 Sep tem ber 2010 – 31 Marc h 2016 (5. 5 yrs ) Date of Completion of Tunnelling Civil Works: 31 March 2016

3 Singapore – 11 November 2016 Central – Wan Chai Bypass and Island Eastern Corridor Link Brief Description

Central, Wan Chai and Causeway Bay lie in the heart of Hong Kong and are heavily trafficked. The existing roads along the northern shore of Hong Kong Island is currently operating bdbeyond its didesign capacitity. Hence there is a compelling need to provide a new trunk road – a 4.5 km dual 3-lane “Central – Wan Chai Bypass (CWB)” to relieve the existing traffic congestion and cater for the anticipated traffic growth. The CWB, consists of 3.7 km tunnel, will be an exppyressway relieving the congestion between the east- west along the northern shore of Hong Kong Island and coping with the predicted traffic flow.

4 Singapore – 11 November 2016 Scope and Type of Works

To meet requirements of the Protection of the Harbour Ordinance (PHO)  least intrusion into the Victoria Harbour  the minimum extent of permanent/temporary reclamation

5 Singapore – 11 November 2016 ScopeScope and and Type Type of of Works Works

• Construction of Cut‐and‐Cover tunnel below sea bed • Construction of Mined Tunnel underneath the existing Cross Harbour Tunnel

6 Singapore – 11 November 2016 Scope and Type of Works

• Temporary reclamation (and its removal) after the completion of the tunnel

Temporarily reclaimed area Construction Method for CWB – Cut-and- Cover Tunnel and Installation of Diaphragm Wall

Construction sequence of Original View of Site Area TS2 Temporary Reclamation Cut‐and‐Cover Tunnel and construction of Diaphragm WWllall is one of the most common methods of construction of tunnel. This method is adopted in the CWB Project. The brief construction procedures are shown in the diagrams.

Construction of Cut and Cover Tunnel Seabed Reinstated after Completion of Cut-and-Cover Tunnel

7 Singapore – 11 November 2016 Scope and Type of Works

Ex‐Wan Chai Public Cargo Causeway Bay Cross Harbour Tunnel Working Area Typhoon Shelter

Cut‐and‐Cover Tunnel Mined Tunnel to be constructed by Cut‐and‐Cover Tunnel being constructed Drill‐and Break method being constructed

Ex‐Wan Chai Public Cargo Cross Harbour Tunnel Causeway Bay Working Area Typhoon Shelter

Completed Cut‐and‐Cover Mined Tunnel Completed Cut‐and‐Cover Tunnel being constructed Tunnel

8 Singapore – 11 November 2016 Scope and Type of Works

Moorings and Anchorages

9 Singapore – 11 November 2016 Design & Construction Innovations Developed for and during the Project

Major tunnel plant in operation No. Drilling Jumbo 6 Crawler Drill 3 Rock Splitter 3 Hydraulic Breaker 8 Backhoe 5 Wheel Loader 3

Singapore – 11 November 2016 Design & Construction Innovations Developed for and during the Project

• Modification of Drilling Jumbo for Continuous Slot Holes (Free Faces) Drilling

Guide Plunger

Drilling of continuous slot holes by modified drilling jumbo with guide plunger

11 Singapore – 11 November 2016 Design & Construction Innovations Developed for and during the Project

• Diaphragm Wall Underwater Cutting

Split & Remove Cut Piece

12 Singapore – 11 November 2016 Design & Construction Innovations Developed for and during the Project

13 Singapore – 11 November 2016 Design & Construction Innovations Developed for and during the Project

1. Additional Steel Weight at CHT Portal  To compensate the additional induced stress estimated in CHT anchors due to mined tunnel excavation

2. Standby Dewatering / Recharggging System  Act as contingency measure against floatation during mined tunnel construction

3. Instrumentation Monitoring at CHT Portal  To closely monitor the structural behavior of CHT portal

4. Magnetometry survey carried out in horizontal holes to  Confirm the existence of CHT anchors  Check clearance between existing CHT ground anchors and the tunnel

Singapore – 11 November 2016 Additional Steel Weights

15 Singapore – 11 November 2016 Standby Dewatering /Recharging System Dewatering Wells – 37 nos. Recharge Wells –51 nos. Piezometers –13 nos.

16 Singapore – 11 November 2016 Comprehensive Instrumentation Monitoring

Layou t Plan of ADMS Pr isms and Strain Gauges

Notification via e‐mail and SMS Alert, Action and Alarm (AAA) Trigger Levels +/‐13, 18 and 22mm Trigger Standby Dewatering / Recharging System Convergence Monitoring in Two Major Stages

17 Singapore – 11 November 2016 Overall Approach to Management of Construction (Methods and Schedule) to Successfully Complete the Excavation(s) within Plan

18 Singapore – 11 November 2016 Overall Approach to Management of Construction (Methods and Schedule) to Successfully Complete the Excavation(s) within Plan

Trinocular Tunnel

19 Singapore – 11 November 2016 Demonstrated Overall Owner Satisfaction with Completed Work, Including Safety and Quality Performance

• Meeting tight programme / milestone • Upon completion of Mined Tunnel, negligible displacement / deformation at the existing Cross Harbour Tunnel • Winning several safety & environmental awards • Speech of the Client, Director of Highways Department of HKSAR, during the Breakthrough Ceremony at Mined TlTunnel,wasverysatisfi e d with theoutcome.

Speech from Director of Highways Department of HKSAR on 15 CSW 2015 – Competition Award “Zero Accident” October 2014

20 Singapore – 11 November 2016 Public / Community Relations Programs to Bring Public Support to the Project and Mitigation of Construction Impacts

• Community Liaison Centre (CLC)

21 Singapore – 11 November 2016 Public / Community Relations Programs to Bring Public Support to the Project and Mitigation of Construction Impacts

• Community Liaison Centre (CLC) • Using work barges for delivery of concrete trucks to avoid imposing additional traffic load to the existing road network

22 Singapore – 11 November 2016 Public / Community Relations Programs to Bring Public Support to the Project and Mitigation of Construction Impacts

• Community Liaison Centre (CLC) • Using work barges for delivery of concrete trucks to avoid imposing additional traffic load to the existing road network • Arranged site visits including collection of public views, consultation of Legislative Council, Harbour‐Front Commission and District Councils

23 Singapore – 11 November 2016 Public / Community Relations Programs to Bring Public Support to the Project and Mitigation of Construction Impacts

Goh Chok Tong William H. Frist

Site Visit – Singapore Emeritus Senior Minister Site Visit – US ex-Senator William H. Frist (19 Mar GhGoh Cho k Tong (22 Jan 2016) 2015)

24 Singapore – 11 November 2016 Public / Community Relations Programs to Bring Public Support to the Project and Mitigation of Construction Impacts

25 Singapore – 11 November 2016 Relevance of the Project and on the Tunnelling Solution

CWB – The Missing Link

26 Singapore – 11 November 2016 Interesting Features / Commercial Resolution To alleviate long traffic queue between east‐west along the northern shore of Hong Kong Island From Central to North Point By 2017: 45 minutes

From Central to North Point

With CWB: 5 minutes

27 Singapore – 11 November 2016 Demonstrate “Value Added” by All of the Above • Four technical papers on this project were published and presented in the international conferences  Institute of Materials, Minerals and Mining (IOM3) in September 2015  World Tunnel Congress 2016 (WTC2016) in April 2016  IItnternati ona lCCfonference UUdnderground CCttionstruction Prague 2016 jjitlointlywith 3rd EEtastern European Tunnelling Conference (EETC2016) in May 2016 • Selected to be the cover story of The Journal of the Hong Kong Institution of Engineers in September 2016

28 Singapore – 11 November 2016 Development of Cost Saving Underground Solutions This project is designed for the rapid population growth and increased urbanisation in the decades ahead, and will be one of themajorinfrastructures in Hong Kong and such design will surely wide use of underground solutions worldwide.

As the theme of WTC 2017, the project team resolved “Surface Challenges” and provided “Underground Solutions” for this section of Central – Wan Chai Bypass Tunnel

29 Singapore – 11 November 2016 Why the Entry should be Selected for an Award Despite the numerous challenges encountered, the team were able to successfully complete the project on time and within budget, and with some cost savings. savings.OverallOverallthe client was very satisfied with the outcome. outcome

30 Singapore – 11 November 2016