10/18/2010 1 Field Construction Engineering Aspects of Bridge Construction Virginia Tech Construction Engineering Conference Creating Bridges As Art ® Thomas DeHaven, P.E. Executive Vice President - Figg Bridge Inspection, Inc. October 1, 2010 CABLE STAYED BRIDGES ARCHES RAIL BRIDGES LONG SPAN BRIDGES ENVIRONMENTAL BRIDGES LONG BRIDGES OVER WATER URBAN BRIDGES Today’s presentation will focus on what the construction engineer can do to help deliver a successful bridge project
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10/18/2010
1
Field Construction Engineering Aspects of Bridge Construction
Virginia Tech Construction Engineering Conference
Creating Bridges As Art®
Thomas DeHaven, P.E.Executive Vice President -Figg Bridge Inspection, Inc.
October 1, 2010
CABLE STAYED BRIDGES
ARCHESRAIL BRIDGES
LONG SPAN BRIDGESENVIRONMENTAL BRIDGES LONG BRIDGES OVER WATER
URBAN BRIDGES
Today’s presentation will focus on what the construction engineer can do to help deliver a
successful bridge project
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Two Types of Relationships
Work for Owner Design/Bid/Build
Work for Contractor
Creating Bridges As Art®
MINNESOTA NEW YORKDELAWARE VIRGINIA
Work for ContractorDesign/Build
Work for Owner Design/Bid/Build
C&D Canal Bridge Delaware
Smart Road BridgeVirginia
Varina-Enon BridgeVirginia
C&D Canal Bridge, Delaware 1994 - 750’ Main Span
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C&D Canal Bridge Delaware
Assistant Resident Engineer
Office Engineer
3 Field engineers at the site
2 Field engineers at the casting facility 230 miles away
Casting Yard Inspectors
Field Construction Engineering
Anticipate issues and solve them before they impact the project
Monitor all aspects of geometry control
Review contractor submittals
Monitor stressing of all PT including cable-stays (2 million pounds of force!)
C&D Canal Bridge, DelawarePrecast concrete delta frames to reduce cost and shorten the construction schedule.
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Pick Weights
Weight of equipment on deck & movement of loads
Precast PiersStep by step operations to
assemble a 100’ tall pier in a day
Cantilever ConstructionBalance loads during each step
of operation
Stressing Forces for vertical post-tensioning
Place pier segment first
Support conditions and rendundancy
C&D Canal Street Bridge, Delaware Span-by-span erection
Delivery and support of each segment
Weight of equipment on cantilever with geometry control and stay stressing
C&D Canal Bridge, DelawareConstruction Engineering examines ways to build over navigable waterways
Keep ships moving at all times
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C&D Canal Bridge, Delaware Opened in 19949 Design Awards
135’ Max
472’
Smart Road Bridge, Blacksburg, Virginia
Concrete segmental variable depth bridge Balanced cantilever construction
Smart Road Bridge, VirginiaNative materials along with flowing shapes create functional sculpture
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Out of balance superstructure load is taken in the pier
Smart Road Bridge, Virginia Balanced Cantilever Construction
Geometry control engineered to connect cantilevers accurately
Smart Road Bridge, Virginia Balanced Cantilever Construction
Smart Road Bridge, Virginia Geometry Control Critical
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Smart Road Bridge, VirginiaCompleted in 20019 Design Awards
Work for Contractor Design/Build
I-35W Bridge Minnesota
Penobscot Narrows BridgeMaine
JFK AirTrainNew York
I-35W BridgeMinneapolis, Minnesota
504 Ft. Main Span
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I-35W BridgeMinneapolis, Minnesota
Opened Sept. 18, 2008 - 5 a.m.
Design/Build in 11 months
Flatiron/Manson Joint Venture
10 lane Interstate over the Mississippi River
FIGG Led the Engineering Team and managed the local consultants
Construction engineering included casting procedure, erection analysis & quality insurance inspection
Minnesota Workers Built This Bridge
The bridge design relied heavily on Minnesota workers and resources
Equivalent of 400 full-time employeesemployees (vast majority local)
Local subcontractors, local materials
A Strategy for Safety and Speed
2-3 shifts day and night, including all holidays except Christmas Day
Zero lost time incidents
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Curing procedures for cold weather
February 15, 2008Pier Construction
Formwork is field engineered
Casting yard on south approach roadway
January 27, 2008
Long Line Precasting
Working from previous segments move bulkhead forward
Place rebar cage and place concrete for bottom slab and webs
Field engineering includes inspection of reinforcing and post-tensioning for quality assurance