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

Central-Wan Chai Bypass and Island Eastern Corridor LinkIsland Eastern Corridor Link -

Causeway Bay Typhoon Sheltery y yp(Contract No. HY/2009/15)

Tim Leung

Singapore – 11 November 2016 Mr. Tim Leung

Client

Highways Department, Hong Kong GovernmentHighways Department, Hong Kong Government

Engineering Firm

AECOM Asia Co LtdAECOM Asia Co. Ltd.

Contractor

China States Construction Engineering (Hong Kong) Ltd

Contractor

Singapore – 11 November 2016

China States Construction Engineering (Hong Kong) Ltd.

2

Contract InformationOverall Cost for Tunnel Civil Works Cost:

€ 614 million (HK$ 5.37 billion)

Length of Drive:

Mined Tunnel = 167 metresCut-and-Cover Tunnel = 598 metres

Duration:

27 S t b 2010 31 M h 2016 (5 5 )27 September 2010 – 31 March 2016 (5.5 yrs)Date of Completion of Tunnelling Civil Works:

31 March 2016


31 March 20163

Central – Wan Chai Bypass and Island Eastern Corridor Link

Brief Description

Central, Wan Chai and Causeway Bay lie inCentral, Wan Chai and Causeway Bay lie inthe heart of Hong Kong and are heavilytrafficked. The existing roads along thenorthern shore of Hong Kong Island is

tl ti b d it d i itcurrently operating beyond its design capacity.Hence there is a compelling need to provide anew trunk road – a 4.5 km dual 3-lane “Central

Wan Chai Bypass (CWB)” to relieve the– Wan Chai Bypass (CWB) to relieve theexisting traffic congestion and cater for theanticipated traffic growth. The CWB, consistsof 3.7 km tunnel, will be an expressway, p yrelieving the congestion between the east-west along the northern shore of Hong KongIsland and coping with the predicted trafficflow


flow.

4

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


Scope and Type of WorksScope and Type of Works

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


g

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

Construction Method for CWB – Cut-and-

Temporarily reclaimed area

for CWB Cut andCover Tunnel and Installation of Diaphragm Wall

Construction sequence of Cut‐and‐Cover Tunnel and construction of Diaphragm W ll i f h

Temporary ReclamationOriginal View of Site Area TS2

Wall 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

Scope and Type of WorksEx‐Wan Chai Public Cargo

Working AreaCross Harbour Tunnel

Causeway Bay Typhoon Shelter

Cut‐and‐Cover Tunnel being constructed

Mined Tunnel to be constructed by Drill‐and Break method

Cut‐and‐Cover Tunnel being constructed

Ex‐Wan Chai Public Cargo Working Area

Causeway Bay Typhoon Shelter

Cross Harbour Tunnel

Completed Cut‐and‐Cover Tunnel

Completed Cut‐and‐Cover Tunnel

Mined Tunnel being constructed


Scope and Type of Works

Moorings and Anchorages


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

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


• Diaphragm Wall Underwater Cutting

Split & Remove Cut Piece





1. Additional Steel Weight at CHT Portal To compensate the additional induced stress estimated in CHT anchors due to p

mined tunnel excavation

2. Standby Dewatering / Recharging Systemy g g g y Act as contingency measure against floatation during mined tunnel construction

3. Instrumentation Monitoring at CHT Portal3. Instrumentation Monitoring at CHT Portal To closely monitor the structural behavior of CHT portal

4 Magnetometry survey carried out in horizontal holes to4. Magnetometry survey carried out in horizontal holes to Confirm the existence of CHT anchors Check clearance between existing CHT ground anchors and the tunnel


Additional Steel Weights


Standby Dewatering /Recharging SystemDewatering Wells – 37 nos.Recharge Wells – 51 nos.Piezometers – 13 nos.


Comprehensive Instrumentation Monitoring

L t Pl f ADMS P i Layout Plan of ADMS Prisms and Strain Gauges

Notification via e‐mail and SMSNotification via e‐mail and SMS

Convergence Monitoring in

Alert, Action and Alarm (AAA) Trigger Levels +/‐13, 18 and 22mm

Alert, Action and Alarm (AAA) Trigger Levels +/‐13, 18 and 22mm

Trigger Standby Dewatering / Recharging System

Trigger Standby Dewatering / Recharging System


Two Major Stages

17

Overall Approach to Management of Construction (Methods and Schedule) to Successfully Complete the Excavation(s) within PlanSchedule) to Successfully Complete the Excavation(s) within Plan


Overall Approach to Management of Construction (Methods and Schedule) to Successfully Complete the Excavation(s) within PlanSchedule) to Successfully Complete the Excavation(s) within Plan

Trinocular Tunnel


Demonstrated Overall Owner Satisfaction with Completed Work, Including Safety and Quality PerformanceIncluding Safety and Quality Performance

• Meeting tight programme / milestone• Upon completion of Mined Tunnel, negligible displacement / deformation at the existing Cross Harbour

TunnelTunnel• Winning several safety & environmental awards• Speech of the Client, Director of Highways Department

of HKSAR, during the Breakthrough Ceremony at MinedT l ti fi d ith th tTunnel, was very satisfied with the outcome.

Speech from Director of Highways Department of HKSAR on 15


Speech from Director of Highways Department of HKSAR on 15October 2014

CSW 2015 – Competition Award “Zero Accident”

Public / Community Relations Programs to Bring Public Support to the Project and Mitigation of Construction Impactsto 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 theexisting road network





• Arranged site visits including collection of public views, consultation of Legislative Council,Harbour‐Front Commission and District Councils






Goh Chok Tong William H. Frist

Site Visit – Singapore Emeritus Senior MinisterG h Ch k T (22 J 2016)

Site Visit – US ex-Senator William H. Frist (19 Mar


Goh Chok Tong (22 Jan 2016) 2015)

24





• Appreciation and acknowledgment from various events and competitions• Appreciation and acknowledgment from various events and competitions


Relevance of the Project and on the Tunnelling Solution

CWB CWB –– The Missing LinkThe Missing LinkCWB CWB –– The Missing LinkThe Missing LinkCWB CWB –– The Missing LinkThe Missing Link


Interesting Features / Commercial ResolutionTo alleviate long traffic queue between east‐west along thenorthern shore of Hong Kong Island

From Central to North Point By 2017: 45 minutesBy 2017: 45 minutes

From Central to North Point

With CWB: 5 minutes


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 I t ti l C f U d d C t ti P 2016 j i tl ith 3 d E t International Conference Underground Construction Prague 2016 jointly with 3rd Eastern

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


Development of Cost Saving Underground Solutions

This project is designed for the rapid population growth andincreased urbanisation in the decades ahead, and will be onef h f d h d llof the major infrastructures in Hong Kong and such design will

surely wide use of underground solutions worldwide.

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


Why the Entry should be Selected for an AwardDespiteDespite thethe numerousnumerous challengeschallenges encountered,encountered, thethe teamteam werewere ableable totosuccessfullysuccessfully completecomplete thethe projectproject onon timetime andand withinwithin budget,budget, andand withwithsomesome costcost savingssavings.. OverallOverall thethe clientclient waswas veryvery satisfiedsatisfied withwith thethe outcomeoutcome.


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

Documents