Bechtel Lecture- Highlights of 4 Special Projects Henry H. Bardakjian
Transcript of Bechtel Lecture- Highlights of 4 Special Projects Henry H. Bardakjian
Bechtel Lecture- Highlights of 4 Special Projects
Henry H. Bardakjian
Arial View of the Carlsbad Desalination Plant
144-inch Diameter RCCP Bay Subaqueous Aqueduct from
Saddle Island to the Main Land
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Saddle Island
Lake Mead Intakes
144-inch Diameter RCCP for the 600 MGD Bay
Aqueduct near Las Vegas
3
12 inch wall, 5/8 inch steel cylinder and three reinforcement cages
Triple 144-inch RCCP assembly weighing 180 tons with two
temporary bulkheads in the launch way saddles on rails. The
assembly is ready to be launched into the water.
5
The floating assembly was pulled by a tug from the
launching site up to the laying barge.
6
The assembly was positioned in the laying barge.
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The hoisting frame
and saddles were
positioned on top
of the assembly.
One bulkhead
would later be
removed and the
assembly lowered
into 90-ft. deep
water for
installation
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Laying Barge and Hoisting Frame and Saddles
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Test Pipe with deflection and radial tension monitors
The hoisting frame
and saddles were
positioned on top
of the assembly.
One bulkhead
would later be
removed and the
assembly lowered
into 90-ft. deep
water for
installation
11
Radial tension and diagonal tension shear crack
at the first test pipe
12
L = 19,884’ (3.8 Miles)
L = 22,458’ (4.3 Miles)
Previous Contract Complete = 8,008’
Arrowhead Tunnels- A 144-Inch-Diameter
Composite Steel-and-Concrete Tunnel Liner Designed For External Heads Up to 1200 feet.
Arial View of the Carlsbad Desalination PlantWaterman Portal
Initial Concrete Gasketed-Segmental Liner
Bechtel Award PresentationFinal Lining Installation
Arrowhead East Tunnel 1999
Components of the composite wall tunnel liner
Figure 2. Components of the Composite Wall Tunnel Liner
CO
NC
RE
TE C
OR
E
NELSON STUD
OUTER CAGE
INNER CAGE
Reinforcing Cages and Nelson Studs Inside The Steel
Cylinder
Special Project Requirements
Hauling Two Pipe Sections into Tunnel
Load Deflection Tests with Some of the
Instrumentation Shown
Figure 4. 3-Edge Bearing Load-Deflection Test
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Measured vs. Calculated Deflections
Measured Deflections
Core
Thick.
Deflections at 50%
Impact Load, in.
Deflections at First
Crack Load, in.
Deflections at 0.01”
Crack Load, in.
Horizontal Vertical Horizontal Vertical Horizontal Vertical
10 in. 0.024 0.02 0.081 0.09 0.42 0.47
12 in. 0.01 0.007 0.044 0.040 0.24 0.27
Calculated Deflections
Core Thick. Maximum Deflection, in.
Uncracked Cracked
Horizontal. Vertical Horizontal Vertical
10 in. 0.041 0.018 0.061 0.027
12 in. 0.031 0.014 0.034 0.015
Bechtel Award Presentation
Olivenhain-Lake Hodges 120-inch Diameter Penstock
Wye Section
Olivenhain-Lake Hodges 120-inch Diameter Penstock
Material Selection Challenge-
Voestalpine Steel Producer in Leinz, Austria
Leinz, Austria
Fabrication Challenges
120 inch steel penstock