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AES Site Visit on 22 March 2014 Final
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3/24/20143/24/2014
11
Harbour Area Treatment Scheme Stage 2AHarbour Area Treatment Scheme Stage 2AConstruction of Sewage Conveyance SystemConstruction of Sewage Conveyance System
from North Point to Stonecutters Islandfrom North Point to Stonecutters Island
Site Visit by AESSite Visit by AES22 March 2014
ContentContent
• Background of the Project• Background of the Project
• Tunnel Construction• Tunnel Construction
• Geotechnical Monitoring• Geotechnical Monitoring
• Stakeholders and Community• Stakeholders and Community
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Harbour Area Treatment Scheme - Stages 1 and 2AHarbour Area Treatment Scheme - Stages 1 and 2A
NN
StonecuttersStonecutters Island
Sai Ying PunSai Ying Pun
Sandy BayNorth Point
Sandy BayCentralCentral
Wan Chai EastHATS Stage 1 Catchment
Ab d
Wan Chai East
HATS Stage 2A CatchmentCyberport Aberdeen
Outfall System (Completed in 2000)Ap Lei ChauHATS Stage 1 Sewage Conveyance System
Ap Lei Chau
(Completed in December 2001)
Wah fu Proposed HATS Stage 2A Sewage Conveyance System (under construction)
Wah fuConveyance System (under construction)
33
Achievement of HATSAchievement of HATS
R t f l i Vi t i H b i 2004 t d i l l• Return of corals in Victoria Harbour since 2004, as reported in local
newspapernewspaper
• Re-open of 7 beaches in Tsuen Wan District – 4 were re-opened in• Re-open of 7 beaches in Tsuen Wan District – 4 were re-opened in
Jun 2011, 1 was re-opened in Sep 2013 and the remaining 2 will be p p g
re-opened in 2014re-opened in 2014
• Cross Harbour Race was resumed in 2011 at the east side of• Cross Harbour Race was resumed in 2011 at the east side of
Victoria Harbour
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HATS Stage 2A - Sewage Conveyance SystemHATS Stage 2A - Sewage Conveyance System
Ap Lei ChaiNorth Point p
AberdeenTunnel J Aberdeen
Tunnel K
S i Yi PSai Ying Pun
Tunnel L
Contract NoContract No.DC/2007/23DC/2007/23
LegendStonecutters Island
DC/2008/09g
Stonecutters IslandDC/2008/09
DC/2007/24DC/2007/24
DC/2007/23
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Contract No DC/2007/23Contract No. DC/2007/23
Client Drainage Services Department (HKSAR)g p ( )
Engineer AECOM Asia Co. Ltd.Engineer AECOM Asia Co. Ltd.
Contractor Gammon Construction LtdContractor Gammon Construction Ltd.
Major Features Tunnel Length: 12kmMajor Features Tunnel Length: 12km
C t t S HKD $3 7 BilliContract Sum HKD $3.7 Billion
ContractContract C t
July 2009Commencement
July 2009
Anticipated Completion Main Works by end 2014Anticipated Completion Main Works by end 2014
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Sewage Conveyance System fromSewage Conveyance System from North Point to Stonecutters IslandNorth Point to Stonecutters Island
DS PS(JS)DS & PSDS & PSNorth Point
DS PS(JS)DS & PSDS & PSWan Chai East Central Sai Ying PunNorth Point Wan Chai East Central Sai Ying Pun
To Stonecutters Island
PS(JS)RS & PSLegend Sai Ying PunStonecutters Island
Soil Layerg
Rock LayerRock LayerDS Drop ShaftDS Drop Shaft
PS Production ShaftPS Production Shaft
JS J ti Sh ftJS Junction Shaft
RS Ri Sh ftRS Riser Shaft
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Typical Sections of TunnelsTypical Sections of Tunnels
Twin Pipes Single Pipep(N h P i S i Yi P )
g p(S i Yi P SCISTW)(North Point to Sai Ying Pun) (Sai Ying Pun to SCISTW)
2( Approx. excavated size : 3.7x3.7 to 5.9x5.9 m2 )( pp )
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Key Considerations for Deep Sewage TunnelKey Considerations for Deep Sewage Tunnel
E tensi e tr ffi nd tilitiesJardine House
Extensive traffic and utilities (52 floor building)
diversion would be involveddiversion would be involved
I i d tSewageSewageT lT l160m160m Inconvenience caused to TunnelTunnel160m160m
publicpublic
• Tunnels underneath major urbanized areasj
• Cover to the tunnels > 30m of bedrock• Cover to the tunnels > 30m of bedrock
MTR MTR• Avoid affecting the foundation of existingAvoid affecting the foundation of existing buildings and facilities
SewageSewagebuildings and facilities
Sewage Sewage TunnelTunnel
• Avoid encroachment into private landsTunnelTunnel
• Geology• Geology
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Hydraulic Design – Inverted Siphon SystemHydraulic Design – Inverted Siphon System
About 170mGround
G it S tGravity SystemPumping
H d
y y
L diff b t Head• Large difference between downstream water level Upstream
Downstreamand ground level
Downstreamg
• Higher pumping Head• Higher pumping Head
Hydraulic GradientGravity Method
Hydraulic Gradient
Inverted Siphon SystemGravity Method
Inverted Siphon SystemAbout 45mUpstream Ground Downstream• Small difference betweenSmall difference between
downstream water level anddownstream water level and ground levelground level
Hydraulic GradientPumping
Head• Lower pumping Head Hydraulic Gradient Headp p g• Less pumping cost• Less pumping cost
Inverted Siphon SystemInverted Siphon System
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T l C t tiTunnel Construction
1111
Tunnelling CycleTunnelling Cycle
After every 4 - 6 blasts y(typically)
Probe Ahead( yp y)
Measure Water InflowT S t
Measure Water InflowTemporary Support
P E tiScaling Mucking
Pre-Excavation G tiScaling, Mucking
and Geological MappingGrouting
and Geological Mapping
BlastingBlasting
(Drilling and Charging)( g g g)
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Pre Excavation GroutingPre-Excavation Grouting
Previous Grout HolesControl HolesControl Holes
Grout Holes
Tunnel Face
Blast
III III IV
Blast
Overlapp
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Pre Excavation GroutingPre-Excavation Grouting
High pressure grouting with micro-fine cement and colloidal silica has beenHigh pressure grouting with micro fine cement and colloidal silica has been applied to control groundwater inflow effectivelyapplied to control groundwater inflow effectively.
B f G ti f GBefore Grouting After Grouting
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Drilling Blast HolesDrilling Blast Holes
Drilling Blast Holes in Progress
Blast Holes Drilled
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Blast Holes Drilled
15
Delivery of ExplosivesDelivery of Explosives
Kam ShanKam Shan Country
ParkPark
Kowloon ReservoirReservoir
Checking the Amount Kowloon Explosives Depot (KED)
gof Explosives at KED
16
p
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Collection and Delivery of ExplosivesCollection and Delivery of Explosives
Checking the Amount of ExplosivesChecking the Amount of Explosives at Blasting SiteDelivery of Explosives at Blasting SiteDelivery of Explosives
Cartridge ExplosiveCartridge Explosive
D t tDetonators
Detonating Bulk Emulsion Primer17
gCords
Bulk Emulsion Pump
Primer17Pump
Charging ExplosivesCharging Explosives
Charging Explosives Completed
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Warning and MonitoringWarning and Monitoring
Display Traffic Warning Vib ti d Ai ODisplay Traffic Warning Sign Board
Vibration and Air Overpressure M it i D i Bl tiSign Board Monitoring During Blasting
G i d W i R d FlGonging and Waving Red Flag 5 i B f Bl ti
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5 mins Before Blasting19
Condition After BlastingCondition After Blasting
Cl N i E lClose Noise Enclosure
After BlastingAfter Blasting
Initiate Blasting
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Spoil RemovalSpoil Removal
H l dTunnel Locomotive Haggloader
Shuttlecar Mucking System2121
Temporary SupportTemporary Support
Rock DowelsGeological Mapping Rock Dowels
Shotcrete
ShotcretingShotcreting
Steel Ribs
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Tunnel Lining ConstructionTunnel Lining Construction
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G t h i l M it iGeotechnical Monitoringg
2424
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Geotechnical MonitoringGeotechnical Monitoring
Piezometer
2525
Geotechnical MonitoringGeotechnical Monitoring
Ground Settlement Marker Structural Settlement Marker
Tell-tale2626
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GEOMON SystemGEOMON System
• Alert levelAlert level• Action level• Action level• Alarm levelAlarm level
Installed (No )Installed (No.)
G d S ttl t M k 517Ground Settlement Marker 517
Structural Settlement Marker 489Structural Settlement Marker 489
Piezometer 129Piezometer 129
Tell-tale 13
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St k h ld d C itStakeholders and Communityy
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Meetings with StakeholdersMeetings with Stakeholders
• District Councils• District Councils• SPCA• SPCA
C H b T l• Cross Harbour Tunnel• MTRC• Customs Marine Base • FSD Diving BaseFSD Diving Base
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School Talks and Activities to Introduce HATSSchool Talks and Activities to Introduce HATS
School Talks / Interview by the Students• School Talks / Interview by the StudentsD i C titi• Drawing Competitions
• Dragon Boat Raceg
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Charity / Community Caring EventsCharity / Community Caring Events
• Walk for Millions• Walk for Millions• Coastal Cleanup• Coastal Cleanup
Vi it t th Eld l C t• Visits to the Elderly Centres• Blood Donation Day• Pizza Making with Childreng
3131
Communication ChannelsCommunication Channels
7901 811124 ho r Hotlines 7901 8111• 24-hour Hotlines
Q t l N l tt• Quarterly Newslettersy
• HATS Project WebsiteHATS Project Website
http:/www dsd gov hk/http:/www.dsd.gov.hk/
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Thank You!Thank You!
Q & AQ & A