Tri State Presentation - 9-24-15
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Transcript of Tri State Presentation - 9-24-15
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LAKE MEAD WATER INTAKE NO. 3Constructing the highest pressure tunnel in the world
to preserve drinking water supply for two million people
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Drought in the Colorado River basin Colorado River supplies 90% of Las Vegas’
water
1983 2013
The Situation
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3
Lake Mead dropped 150 feet between
2000 and 2015
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HIGH AND LOW LAKE LEVEL ELEVATIONS
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Intake No. 1 Out of ServiceIntake No. 2 Out of Service
Saddle Island Elevation 860’
Spillway gates
Elevation 1,000’
Hoover Dam
Dead Pool - Elevation 897’
Spillway Gate - Elevation 1,224’
Elevation 1,050’
INTAKE NO. 3
INTAKE NO. 2
INTAKE NO. 1
Drought Impacts
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If the lake level falls below 1,050 feet: Intake No. 1 will be out of service Pumping capacity will be reduced
A new intake system is needed to preserve existing
capacity and water quality if lake levels continue to decline.
Lake Mead Water Level Impacts
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Lake Mead Intake No. 3 Approved by SNWA Board of Directors May
2005 Six contracts (originally), $817 Million total
(est)… Deferred Pumping Station - three major contracts $650M estimated construction value
Completion 2015 (2020 with Pumping Station)
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Challenges Variable Geology:
Hard, fractured Weak sedimentary Volcanic rock
High tunneling pressures – 17 bar (250 psi)
Intake Structure installed in 350 feet of water
Intake Structure/TBM docking within a 1-ft tolerance after 3 miles of tunneling
Connection to existing operating intakes
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Project Location
Lake Mead Las Vegas
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Exist Water Treatment
Facility
L3P3 PUMPING STATION
Intake 3
INTAKE TUNNEL
DISCHARGE PIPELINES
INTAKE No. 2 CONNECTOR TUNNEL
Lake Mead Intake No. 3 Contracts
Exist Intake 1
Exist Intake 2
INTAKE No. 2 CONNECTION & MODIFICATIONS
Lake Mead
Saddle Island
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Exist Water Treatment
Facility
Intake 3
INTAKE TUNNEL
INTAKE No. 2 CONNECTION
Exist Intake 1
Exist Intake 2
INTAKE No. 2 CONNECTION & MODIFICATIONS
Lake Mead
Saddle Island
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Vegas Tunnel Constructors (Design-Build) ~ $450MAccess Shaft• ~ 600’ deep• 30’ finished interior diameter
Tunnel• Launch Chamber ~ 202’ long, 47’ W x 35’ H• Starter Tunnel ~ 450’ long, 27’ W x 25’ H • TBM tunnel
– 20’ finished internal diameter– ~ 14,904’ long– 14” concrete segmental lining
Intake Structure (elev 860)• 96’ high• 16’ diameter riser• Radial inlet
Shafts & TunnelAs deep as the Wynn is tall!
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13
Top-Down Shaft Construction Sequence
1) Drill2) Blast3) Excavate4) Map the rock
face5) Initial Support6) Lower Form7) Cast ConcreteRepeat…
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Shaft ExcavationCompleted
January 2010
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TBM Assembly Chamber
TBM Chamber Excavating Top Heading – Nov 2009
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TBM Assembly Chamber
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Beginning of inflow in Starter Tunnel - June 28, 2010
Incursion of Unstable Ground
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Tunnel Flooding
Flooding EventJune 28th – July 1st, 2010
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Area of Tunnel Inflows
Tunnel Realignment
New Alignment
January 2011
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20 Realigned Starter Tunnel viewed from Cavern – 03/29/11
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Starter Tunnel
CompletedJune 2011
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Drilling Jumbo Truck - Hoover Dam Diversion Tunnelshttp://www.usbr.gov/history/photos/dams007.jpg
Back then…
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23
Tunnel Boring Machine• 24ft Outside Diameter• 600ft Long Trailing Gear • Total Weight 1500 Metric
Tons• TBM was designed to be
driven in rock with water head up to 17 bar (250 psi)
• Capable of grouting and soil improvement ahead of the face
• Machine designed and fabricated specifically for this project with strict cooperation between SNWA, Design-Builder, and Supplier (Herrenknecht)
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Contract 01
TBM TRAILING / SUPPORT GEAR - 585’ long, 1500 tons
TBM
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Strand Jacks Used to Handle Weight and Depth
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Lowering TBM Down Shaft
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27 TBM Lowering September 2011
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TBM Positioned At Tunnel Face
December 27, 2011
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Local Mfg. of Precast Segments
5 Segments + I keystone = Ring
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30 Tunnel Segments delivered to Site
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31
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Segment Transport
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3,000 feet at
13.5 bar WHAT PSI IS 13.5
BAR ?
195.80 PSI
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Took a Toll on the Machine
2013 Mar 29
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2013/2014 TBM Repairs
3 Repair Stops
4 foot deep niche excavated in front of cutterhead
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36
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Soft eye
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25’ 10”
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41 Stainless Steel Riser Assembly
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42 Stainless Steel Intake Screen
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Intake Riser - Excavation
Spring 2010
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44
Preparations for Excavation at lake bottom
• Additional ground investigation• Bathymetry Survey• Excavation and Blasting done from
crane barge• Clam and airlift “Overburden”-
15,000 CY• Overburden was 6 ft of desert soil;
very small silt layer about 6 inch on top.
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Shaped Charges Placed on rock surface 7.5 kg / charge Placement structure
30 ft x 30 ft Small blasts at surface – Fish Scare
23,000 charges
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46 Rendering of final excavation at lake bottom
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Intake Structure Installation
Total Tremie Concrete = 11,300 cy
February and March 2012
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Assembled Intake Structure Conveyed to Intake Site
15 Feb 2012
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Concrete Batch Plant
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Concrete Transport Barge
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Intake Structure Tie in
10-ft.
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ROV Intake Inspection
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Cleaning Seal with ROV
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Lowering Bulkhead
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Piece of soft eye during hole through
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59
Breakthrough on December 10, 2014
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60
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TBM Removal
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TBM Removal
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TBM Removal - Completed Apr 27, 2015
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Tunnel Steam Cleaner
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Remaining Milestones
Intake No. 3 Shafts & Tunnel
Operational October 2015 Final Completion January 2016
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600
800
700
900
1100
1000
1200
1300
Intake 3 Tunnel
Inta
ke 3
Inta
ke 1
Connector Tunnel
RMWTF
AMSWTF BROFIPS-1 IPS-2
IPS-2 Pump Operation Limit El. 1000
IPS-1 Pump Operation Limit El. 1050
Lake Elev. (feet above MSL)
Inta
ke 2
Isola
tion
Gate
L3PS
68
Low Lake Level Pumping Station
L3PS was approved by the SNWA on December 10, 2014
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L3PS CONTRACT PACKAGES
Mass Excavation - Design-Bid-Build
Pumping Station - CMAR Underground Mechanical and Electrical
Discharge Pipelines – Design-Bid-Build
Electrical Feed & Substation – Design-Bid-Build (by CRC)
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Questions? Questions ?