IMUA ANNUAL PRESENTATION 2013

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Cori O’Connor’
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1 IMUA ANNUAL PRESENTATION

2 Who We Are: Founded in 1947 in Colorado Have expanded to a company of approximately 2,000 With Operations Constructing Transportation, Water and Energy Infrastructure throughout the US and Canada 2

3 Focus on Inland Bridge Construction I-35W - Minnesota 3

4 Where We Started: Glenwood Canyon Corridor (I-70) Glenwood Springs, Colorado 4

5 Sagadahoc Bridge over the Penobscot River 5

6 CAROLINA BAYS PARKWAY MYRTLE BEACH 6

7 Arthur Ravenal Bridge over the Cooper River 7

8 Alfred Zampa Memorial Bridge Over the Carquinez Straits Crockett, CA 8

9 San Francisco Oakland Bay Bridge Skyway 9

10 John James Audubon Bridge Sereno Brown, PE Deputy P.M. / Project Engineer 10

11 About the Project 11

12 Contract Details Proposal Date: January 18, 2006 NTP Date: May 4, 2006 Final Acceptance: May 5, 2011 Total Contract Value: $347,860,000 Final Contract Value: $355,901,114 12

13 Contract Team Flatiron Constructors, Inc. 54% Granite Construction, Inc. 25% Parsons 21% 13

14 Where is St. Francisville, LA 14

15 Bridge 3-3: Cable-Stayed Unit Bridge 3 15

of Earth Work 4 New Intersections 10+ Design Consultants Bridge 6

16 Project Overview 8 Bridges Begin Bridge 3 Bridge 2 12 miles of 2-lane asphalt roadway End Bridge 3 Bridge 4 Bridge 5 1,100,000 CY of Earth Work 4 New Intersections 10+ Design Consultants Bridge 6 Bridge 7 Bridge 8 New US Hwy 61 & LA Hwy 10 Intersection Existing US Hwy 61 16

17 General Information First Design-Build project for Louisiana DOTD Furthest South in Mississippi River that drilled shafts are used to support superstructure. Other Notable Citations: 1. John James Audubon at 1,583 ft 1. Longest Cable Stay Bridge in Western Hemisphere! st Longest Cable Stay Bridge in the World 2. Cooper River at 1,546 ft (Also Constructed by FLATIRON) 1. Previous Record Holder for Longest in Western Hemisphere th Longest Cable Stay Bridge in the World 17

18 Layout of Cable Stayed Unit 18

19 General Arrangement 1583 ft Main Span 2866 ft Cable Stayed Portion 2.27 miles including approaches 19

20 Chief Obstacles to a Bridge of this Type 1. Finding an adequate foundation 1. No Rock 2. High Potential For Vessel Impact / Barge Impact 2. Contending with the Mississippi River 1. Extreme Variability in River Levels 2. Unpredictable and Potential For Rapid Change 20

21 Chief Obstacles to a Bridge of this Type 1. Finding an adequate foundation 1. No Rock 2. High Potential For Vessel Impact / Barge Impact 2. Contending with the Mississippi River 1. Extreme Variability in River Levels 2. Unpredictable and Potential For Rapid Change 21

22 Traditional Foundation Types 1. Sunken Caisson 22

23 Traditional Foundation Types 1. Sunken Caisson 23

24 Traditional Foundation Types 1. Sunken Caisson 24

25 Traditional Foundation Types 1. Sunken Caisson 25

26 Traditional Foundation Types 1. Sunken Caisson 26

27 Traditional Foundation Types 1. Sunken Caisson 27

28 Traditional Foundation Types 2. Driven Pile 28

29 Traditional Foundation Types 3. Drilled Shafts 29

30 Install Oscillator 1. Set Base 2. Set Oscillator 30

31 Excavate Temporary Casing Using Bottom of Permanent Casing 90 Temporary Casing Hammer Grabs West East

32 32 Excavate Temporary

33 Lower Cage Set Rebar Cage Upper Cage 33

34 Pour Tremie Concrete 1 Initially, Tremie pipe is set ~ 6 above base plate while concrete is pumped. 2 Once flow is established and a seal around the Tremie is formed by the concrete, the temporary casing is oscillated up, always maintaining a 10 plug. 10 Min. Embed Note: In order for casing to be extracted, a 10 Slump must be maintained for Duration of Pour (~8 hours) 34

35 Chief Obstacles to a Bridge of this Type 1. Finding an adequate foundation 1. No Rock 2. High Potential For Vessel Impact / Barge Impact 2. Contending with the Mississippi River 1. Extreme Variability in River Levels 2. Unpredictable and Potential For Rapid Change 35

36 Access to the Work 36

37 Access to the Work 37

38 Chief Obstacles to a Bridge of this Type 1. Finding an adequate foundation 1. No Rock 2. High Potential For Vessel Impact / Barge Impact 2. Contending with the Mississippi River 1. Extreme Variability in River Levels 2. Unpredictable and Potential For Rapid Change 38

39 Trestle and Work Platform Built to feed all stages of construction from drilled shafts to deck erection. East Trestle 342 ft long West Trestle 870 ft long Provided some relief from annual flood waters. 39

40 Annual Fluctuation of Mississippi River Max River Level Min River Level

41 Working on the River (Or Trying ) HIGHEST RIVER LEVEL RECORDED OVER LAST 85 YEARS NEW $2M CRANE 41

42 Working on the River (Or Trying ) 42

43 Working On the River (Or Trying ) 43

44 Foundation Construction Design & Construction of Pier Footings 44

45 Foundation Construction Design & Construction of Pier Footings THE CHALLENGE: How to construct a reinforced concrete monolith, approximately half the size of a football field, underwater. In depths that can vary from 4 to 45 below water? THE PLAN: Construct the shell of the pier, above water, then carefully submerge it into position create a waterproof seal and then remove all the water leaving a rigid empty shell to construct your pier within. BEHOLD: The Modular Cofferdam For an idea that does not first seem insane, there is no hope. Albert Einstein 45

46 Past Project Experience Bath, Maine Bath, Maine

47 Past Project Experience John s Pass, FLORIDA

48 Vetting the Design: We Built Models 48

49 Vetting the Design: We Built Models Lots of Models 49

50 Lowering Mock-Up Employee Training Even Full Scale! 50

51 Peer Design Review (Global Marketplace) Concept Peer Review Final Peer Review Project Design Check Cofferdam Design Project Locale Project Design Check 51

52 Cofferdam Erection Sequence Piles and trestle are installed 52

53 Install Soffit Panels Top View 53