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

2

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.

7

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

8

Laying Barge and Hoisting Frame and Saddles

9

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

21

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