St. Anthony Falls (35W) Bridge

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Coordinates: 44 ° 58 ′ 44 ″  N , 93 ° 14 ′ 42 ″  W.

Interstate 35W (Minnesota) St. Anthony Falls (35W) Bridge
St. Anthony Falls (35W) Bridge
On the opening day, view from the south.
Official name St. Anthony Falls (35W) Bridge
Convicted 10 lanes of the I-35W
Subjugated Mississippi River
place Minneapolis , Minnesota , United States
Entertained by Minnesota Department of Transportation (Mn / DOT)
Building number NBI 27410 (northward), 27409 (southward)
construction Box girder bridge made of reinforced concrete
overall length 371 m
width 55 m
Longest span 154 m
height 37 m (estimated)
Clear height 21 m
vehicles per day 141,000 (2005 estimate)
start of building October 30, 2007
opening September 18, 2008
location
St. Anthony Falls (35W) Bridge, Minnesota
St. Anthony Falls (35W) Bridge

The St. Anthony Falls (35W) Bridge is the new crossing of the Mississippi River in Minneapolis , Minnesota as part of Interstate Highway 35W . The construction, commissioned by the Minnesota Department of Transportation (Mn / DOT, the Minnesota Department of Transportation ) became necessary after the existing bridge structure collapsed at the same location on August 1, 2007.

In addition to the Mayor of Minneapolis RT Rybak and the Governor of Minnesota Tim Pawlenty , numerous residents of the city also influenced the planning of the building in public hearings. Nevertheless, the planning and construction took place much faster than usual for comparable structures. One reason for this is the importance of the river crossing at this point for traffic in the city and in Minnesota's north-south traffic. The new building was released on September 18, 2008, 414 days after the bridge collapse and more than three months before the originally planned date.

Collapse of the previous river crossing

The old, collapsed bridge

On August 1, 2007, at 6:05 p.m. local time, the existing bridge on Interstate Highway 35 over the Mississippi River in Minneapolis collapsed. The roadways collapsed into the river and onto its banks. 13 people were killed and 145 injured in the accident.

The structure was built in 1967 and was originally designed for a load of 66,000 vehicles per day. The useful life was estimated at at least 50 years. Initially, there were two lanes in each direction across the bridge. In 1988, in response to the increased traffic, the hard shoulder to the left and right of the two lanes were converted into lanes, so that a total of eight lanes crossed the river. In 2004, an average of around 141,000 vehicles drove over the bridge every day.

financing

Press conference of the Ministry of Transport . Left to right: Tim Pawlenty, RT Rybak, Mary Peters (obscured), Keith Ellison , Betty McCollum , Norm Coleman.

Within a few hours of the collapse of the existing bridge, politicians had spoken out in favor of building a replacement structure as soon as possible. Emergency aid was provided by the United States federal government to clear the rubble and retrieve the victims. The deputy for the 8th congressional district of Minnesota in the US House of Representatives Jim Oberstar , of the House Transportation Committee projects, introduced a bill to at least 250 million US dollars to provide for a new building available; the draft was unanimously adopted on August 3rd.

The Republican Senator Norm Coleman and Senator Amy Klobuchar of the Democratic-Farmer-Labor (DFL) introduced a bill with success by the Senate. President George W. Bush signed the bill on August 6, 2007; however, because of disagreements in Congress, it was not until December 26, 2007 before President Bush signed the budget amendment bill ordering the spending.

Discussion of execution

Piers on the north bank in May 2008

RT Rybak (DFL), the Mayor of Minneapolis, indicated early on that in the rush to fill the void in the city and state transport network, future transport policy requirements and considerations should not be neglected . He demanded that the new building should serve both the increased traffic and local public transport. In negotiations between Mayor Rybak, Minnesota's Minister of Transport Carol Molnau and Governor Pawlenty, the requirements for a new building project were finally drawn up. These envisaged a ten-lane bridge, which should be prepared for the subsequent installation of a bus lane or a light rail and whose useful life should be estimated at at least 100 years. At a public hearing, hundreds of citizens of the twin cities of Minneapolis-Saint Paul expressed a desire that public transportation needs be considered in planning. Transport Minister Molnau and the Chairman of the Metropolitan Council Peter Bell initially insisted that a light rail should not be part of the plans for the new building. However, the governor of Minnesota instructed the Department of Transportation (Mn / DOT) to consider a light rail line when planning. The state of Minnesota will bear the additional costs of up to 35 million US dollars. A route of the light rail line " Central Corridor " over the new bridge saves up to 200 million US dollars in construction costs, since a new tunnel had to be built in the previous planning of the line and a bridge had to undergo extensive renovation work.

Finally, it was decided that the new building over the river should be designed with two bridge structures separated by around two and a half meters, each with five lanes, with the option of a tram line to be implemented later or of separate bus lanes over the structure. In the planning, the total width was planned to be around 60 meters - around 25 meters more than the collapsed bridge.

Tender

Prefabrication of the box girder sections in May 2008

After the old bridge collapsed, Mn / DOT asked construction companies to register their interest in the tender by August 8, 2007. Typically, projects of this magnitude in Minnesota take three years to complete, but because of their importance, the Department hoped to complete within 15 months. On August 9, it was announced that five companies had declared their intention and that the offers had to be submitted by September 18, 2007.

On September 19, 2007, the contract was awarded to Flatiron Constructors and the Manson Construction Company ; Figg Engineering was selected as senior engineer . The bid submitted by Flatiron Constructors was the one with the highest price and the longest construction time. The expected cost framework for the construction was estimated at 300 to 350 million US dollars . Included in the budget were premiums for quick construction; the contract was ultimately awarded for $ 234 million. The contract included a $ 200,000 penalty for each day of delayed completion after the scheduled December 24, 2008 deadline. If completed early, construction companies could receive premiums of up to US $ 27 million.

The projects that have already been implemented by the selected construction companies include the Escambia Bay Bridge near Pensacola (Florida), the John James Audubon Bridge between St. Francisville and New Roads in Louisiana , the Arthur Ravenel Jr. Bridge near Charleston (South Carolina), and part of the San Francisco-Oakland Bay Bridge in California. Figg Engineering were the lead structural engineers for the construction of the Sunshine Skyway Bridge near St. Petersburg (Florida).

Construction phase

July 5, 2008.

Mn / DOT maintained a website which documented all activities related to the construction of the new bridge and provided weekly reports on construction progress, pictures of the various construction phases, animations and other materials. On December 17, 2007, far away from the construction site, the first concrete beam was poured, around 60 m long, 4.1 m wide and 137 cm thick. The bridgeheads were founded about 30 m deep.

Work was carried out around the clock on the construction site; Up to 400 workers were active on site during the day and around half during the night.

On April 8, 2008, Mn / DOT announced that construction work was halfway through and predicted that completion could take place up to three months ahead of schedule. On July 5, 2008, the last bridge segments of the northbound carriageway were laid. The hope for an early completion proved correct when the Minnesota Department of Transportation was able to open the bridge to traffic on September 18, 2008 at 5:00 a.m.

Modern technology

The bridge is equipped with spray systems for de-icing and was built with prestressed reinforced concrete . 323 sensors monitor the bridge structure, including the movement of the bridge deck, the voltage and the temperature. This data is collected and analyzed by the University of Minnesota . Ultramodern spotlights with light-emitting diode technology provide the lighting on the bridge .

Web links

Commons : St. Anthony Falls (35W) Bridge  - Collection of Images, Videos, and Audio Files
 Wikinews: Minneapolis I-35W bridge spans Mississippi River (English)  - Message
 Wikinews: New I-35W Minneapolis bridge opens  - message

Individual evidence

  1. ↑ Tom check: Rebuild may begin in September ( English ) Minnesota Public Radio. August 7, 2007. Retrieved November 7, 2007.
  2. ^ Jason Hoppin: The design for the I-35W replacement bridge is unveiled ( English ) Pioneer Press. October 9, 2007. Retrieved November 7, 2007.
  3. ↑ MnDot - I-35W St. Anthony Falls Bridge ( Memento of the original from December 26, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / projects.dot.state.mn.us
  4. ↑ a b Engineer: Mn / DOT to open I-35W St. Anthony Falls Bridge to traffic at 5 am Thursday, Sept. 18 ( English ) MnDot. July 11, 2008. Archived from the original on September 21, 2008. Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved February 16, 2011. @1@ 2Template: Webachiv / IABot / www.dot.state.mn.us
  5. ↑ a b c Tom Scheck: Rebuild may begin in September . Minnesota Public Radio. August 7, 2007. Retrieved August 8, 2007.
  6. ^ Drivers, Businesses Celebrate 35W Bridge Reopening (English) , WCCO. September 18, 2008. Archived from the original on September 21, 2008 Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . Retrieved November 7, 2008. @1@ 2Template: Webachiv / IABot / wcco.com 
  7. ↑ Sea Stachura: Too much stress on I-35W bridge? . Minnesota Public Radio. August 6, 2007. Retrieved August 7, 2007.
  8. ^ At Bridge Site, Search of River Moves Slowly , By Monica Davey, New York Times, August 3, 2007
  9. ↑ House Panel Approves $ 250M Fund Request For Bridge , WCCO. August 2, 2007. Archived from the original on September 27, 2007 Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. . Retrieved August 7, 2007. @1@ 2Template: Webachiv / IABot / wcco.com 
  10. ↑ Amy Gardner: Bush Signs Domestic Spending Bill but Criticizes Pet Projects . Washington Post. December 27, 2007. Retrieved December 28, 2007.
  11. ^ Tom Scheck: I-35W bridge reconstruction could delay other projects . Minnesota Public Radio. August 5, 2007. Retrieved August 7, 2007.
  12. ↑ Jessica Mador: Residents have plenty to say about bridge replacement . Minnesota Public Radio. August 16, 2007. Retrieved August 24, 2007.
  13. ↑ Martiga Lohn: Dive resumes at bridge site after delay for fast-running river ( English ) Minnesota Public Radio. August 11, 2007. Retrieved August 12, 2007.
  14. ^ Letter from Carol Molnau and Peter Bell to Governor Tim Pawlenty ( English , PDF; 1.1 MB) MnDOT. August 10, 2007. Archived from the original on October 25, 2007. Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved August 12, 2007. @1@ 2Template: Webachiv / IABot / www.dot.state.mn.us
  15. ^ Allie Shah: Light Rail Proposed for Bridge Design . In: Strib Notebook . Star Tribune. August 10, 2007. Retrieved August 24, 2007.
  16. ↑ I35W Bridge Replacement - Rebuild Plans ( English , PDF; 37 kB) Mn / DOT. August 2007. Archived from the original on January 21, 2013. Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved August 27, 2007. @1@ 2Template: Webachiv / IABot / www.dot.state.mn.us
  17. ↑ Contractor drops bid to build replacement I-35 bridge ( English ) Minnesota Public Radio. August 28, 2007. Retrieved November 8, 2008.
  18. ↑ Tom Scheck: MnDOT chooses five finalists for 35W rebuild ( English ) Minnesota Public Radio. August 9, 2007. Retrieved August 10, 2007.
  19. ^ I-35W Contract Awarded, Conceptual Design Unveiled . Architectural Record, Mc-Graw Hill Construction. 2007. Retrieved November 12, 2007.
  20. ↑ a b Martiga Lohn Martiga Lohn: Rich contract awarded for I-35W bridge replacement . Minnesota Public Radio. September 19, 2007. Retrieved September 19, 2007.
  21. ^ Tom Scheck: State offers bonus for quick bridge replacement . Minnesota Public Radio. August 24, 2007. Retrieved August 24, 2007.
  22. ^ I-10 Bridges, Escambia Bay, FL, USA . SPG Media Group PLC. 2007. Retrieved August 10, 2007.
  23. ↑ JOHN JAMES AUDUBON BRIDGE . Buckland and Taylor Ltd .. 2005. Retrieved August 10, 2007.
  24. ↑ Tom Scheck: Who is Flatiron Construction? . Minnesota Public Radio. September 21, 2007. Retrieved September 21, 2007.
  25. ^ Sunshine Skyway Bridge (1987) . Structurae, Nicolas Janberg. 2007. Retrieved November 12, 2007.
  26. ^ Sunshine Skyway Bridge . Figg Engineering. 2007. Retrieved November 12, 2007.
  27. ↑ I35W St. Anthony Falls Bridge ( English ) Minnesota Dept. of Transportation. Archived from the original on December 26, 2007. Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved November 8, 2008.  @1@ 2Template: Webachiv / IABot / projects.dot.state.mn.us
  28. ↑ Jim Foti: 35W bridge rebuilding gets underway in earnest ( English ) Star Tribune. December 18, 2007. Archived from the original on December 19, 2007. Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved November 7, 2008. @1@ 2Template: Webachiv / IABot / www.startribune.com
  29. ↑ Reality Check: Speedy Road Construction ( English ) WCCO. May 28, 2008. Archived from the original on November 8, 2008. Retrieved on November 8, 2008.
  30. ↑ Bridge milestone, halfway done ( English ) KSTP. Archived from the original on November 8, 2008. Retrieved November 8, 2008.
  31. ↑ Jessica Mador: Cutting-edge technology makes new 35W bridge a model for future ( English ) Minnesota Public Radio. September 16, 2009. Retrieved November 7, 2009.
Upstream
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