Moving Forward - MAASTO - 2C - St Croix Crossing.pdf · Moving Forward MAASTO Conference July 17, ... •18 feet deep on main span ... –Three foundations must be complete by end

Moving ForwardMAASTO Conference

July 17, 2013

Connecting Oak Park Heights & Stillwater, Minnesota with Houlton, Wisconsin

Welcome/Introductions

David Solberg - WisDOT, Project Manager

Jon Chiglo - MnDOT, Project Director


Where is Stillwater, Minn.?


Project Area


MinnesotaWisconsin

Project Overview


Project Need

• Traffic congestion• Mobility• Safety• Delays from Lift Bridge

operation• Physical restrictions• Needs of pedestrians• Lift Bridge condition


Act of Congress126 STAT. 268 PUBLIC LAW 112–100—MAR. 14, 2012

Public Law 112–100 112th Congress

An Act To authorize the St. Croix River Crossing Project with appropriate mitigation measures to promote river values.


Protected Resources


• 50+ permits/approvals

• Almost 30 different agencies/entities

Extradosed Bridge Type

• Composite of Cable Stay and Segmental Box Girder bridge types.

• Load shared by Beam Action (i.e. deck stiffness) and Cables to Towers

• 40+ Extradosed Bridges in Japan plus more in France, Korea, and Canada.

• Pearl Harbor Bridge, CT (1st U.S. Extradosed Bridge)


Extradosed Bridge Type


Organic Style


St. Croix Crossing Main Bridge


Multi-State Coordination• Design Review

– Over the shoulder reviews

• Development of Specifications

• Risk Management

• Split Project Management

• Wisconsin Approach

• Minnesota Approach and Bridge

• Partnering meetings

• Public Outreach in Wisconsin and Minnesota


Extradosed Bridge Contract

• June, 2012 - Selected HDR/B&T to Design Bridge

• July, 2012 - Selected HNTB as Peer Reviewer

• Completed Design Optimization Study

• Span lengths

• Reduce water piers

• Implement foundation results of load test

• Identify most effective method to construct bridge

• CIP vs. Precast segmental


Design Refinement Analysis• Lengthened spans from 475’ to 600’

• Reduced number of water piers from 6 to 5

• Reduced number of tower piers from 7 to 5

• Foundations Load Test

• 20% reduction in number of shafts

• 20% reduction in shaft area

• 50% reduction in rock socket length

• Identify method to construct bridge

• Less impact on shore (reduce footprint)


Specialty Studies and Reports

• Design and Load Rating Criteria

• Bridge Maintenance and Inspection Manual

• Quality Management Plan

• Bridge Fixity Study Report

• Wind Engineering Study Report

• Redundancy Analysis Report

– Cable stay system; struts between box girders

• Bridge Security

Bridge Data

• Total bridge length 5060 feet

• Out-to-out width on deck

• 98 feet on main spans; 43 feet on approaches

• Precast Segmental Areas

• 18 feet deep on main span (650 segments)

• 10 to 14 feet deep on approach (375 segments)

• Cast-in-place Areas

• Gore area, 14 to 18 feet deep

• On Ramp, 10 to 14 feet deep


Typical Extradosed Span


Double Box Girder Size


Early Foundations Contract

• Separate contract for all pier foundations in river

– 10 pier towers, 4 drilled shafts per tower

• Risk management strategy

• Let in March of 2013

• Completion by July 1, 2014

– Three foundations must be complete by end of 2013

– Incentive to complete all piers by January of 2014


Superstructure Contract

• Plans and Specifications Ad Date of July 19, 2013.

• Project Letting of October 11, 2013.

• Pre-qualification of Key Contractor Personnel.

• Provide CPM schedule and 4D model to bidders.


Schedule Management

• CPM schedule for design and construction – Cost and resource loaded schedules

• Design completed in 12 months

• Design and Construction Quality Management

• Co-Housed with HDR– Expedite decisions, issue resolutions

– Commitment to schedule

• Fourth dimension of 4D model


4D Model


Cost Management• Lump Sum Design Contract

– Payment made on earned revenue

• Active Risk Management of Contract

• Independent Cost Estimator

• Design Refinement Analysis

• Constructability Reviews

• Locked Incentive (no excuse clause)

• Design and Construction Quality Management

• Early contracts (Foundations, Piling, Mn Approach)


Keys to Continued Project Success

• Communication and Public Outreach

• Aggressive Cost/Schedule Management

• Proactive Risk Management

• Partnering

Connecting Oak Park Heights and Stillwater, Minnesota with Houlton, Wisconsin

Successful Completion


Documents

Moving Forward - MAASTO - 2C - St Croix Crossing.pdf · Moving Forward MAASTO Conference July 17, ... •18 feet deep on main span ... –Three foundations must be complete by end