3/24/2014 3/24/2014 1 1 Harbour Area Treatment Scheme Stage 2A Harbour Area Treatment Scheme Stage 2A Construction of Sewage Conveyance System Construction of Sewage Conveyance System from North Point to Stonecutters Island from North Point to Stonecutters Island Site Visit by AES Site Visit by AES 22 March 2014 Content Content • Background of the Project • Background of the Project • Tunnel Construction • Tunnel Construction • Geotechnical Monitoring • Geotechnical Monitoring • Stakeholders and Community • Stakeholders and Community 2 2
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3/24/20143/24/2014
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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
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
15
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