Tag Archives: Deep Foundation Design

TH 53 Bridge Begins to Rise from the Ground

Bridge and Subsurface Rendering
Bridge and Subsurface Rendering (rendering courtesy of MnDOT)

A lot has changed from a year ago at the TH 53 Bridge sight near Virginia, Minnesota.  This time last year, the design-phase test pile program was wrapping up with three Statnamic load tests and we had just completed our initial geologic field investigation.  Since then, significant excavation, rockfall protection, and foundation work has been completed.  During summer and fall of 2015, DBA worked closely with contractors Hoover Construction and Pacific Blasting to maintain rockfall protection throughout the East Abutment and Pier 1 (East Pier) excavation process.  Official ground breaking occurred last November and foundation work started shortly after.  A total of 32, 30-in micropile foundations have been installed by Veit Specialty Contracting  and Kiewet Infrastructure  has completed a temporary causeway across the massive Rouchleau Pit by placing over 300,000 cubic yards of fill.

With the foundations of both piers complete, and the pier towers are starting to rise up, where they will carry the bridge deck 200 ft above.  The abutments are also taking shape with rock bearing concrete footings now poured on both sides of the pit.  The only foundation work left is to install tieback anchors at the East Abutment, which will reduce the lateral loading of the tall piers.

In a little over a year, the bridge is scheduled to open to traffic.  You can keep track of the progress through the project web cam.

Current View of Site, Piers Beginning to Rise
Current View of Site, Piers Beginning to Rise (photo from OxBlue Web Cam)

Ground Breaking of New TH 53 Bridge in Minnesota

TH 53 Bridge

TH 53 Bridge, artistic rendering courtesy of MnDOT

The official groundbreaking for the Trunk Highway (TH) 53 Bridge and Relocation Project occurred last week at the project site in Virginia, Minnesota.  The bridge, which is the main element of the project, will span the Rouchleau Iron Ore Mine Pit.  The project is scheduled to be completed in a brisk two years in order to allow for mining where a section of TH 53 is currently located.  Upon completion the 1,100-foot long bridge will be Minnesota’s highest, with the roadway sitting approximately 330 feet above the bottom of the floor of the Rouchleau Pit.  Kiewit was selected as the general contractor for the project with Veit Specialty Contracting as the foundation contractor.

Foundation construction will start in late November or early December with the installation of 30-inch diameter micropile foundations for the western pier of the three span, steel plate girder bridge.  Although the foundation work is just about to get started, DBA has been hard at work on the project for over a year.  DBA first got involved as a consultant to MnDOT for the design-phase load test program conducted last fall.  Since then, DBA was contracted as the geotechnical engineer of record for the project.  Working with bridge designer Parsons, DBA designed the bridge foundations, an anchored abutment, and rockfall hazard mitigation systems for this geologically challenging site.  DBA has also analyzed several soil and rock slopes to verify stability of the bridge and roadway.

Most recently, some of us were on site to inspect some of the rockfall protection elements on the east side of the mine pit. Last week we spent two days climbing and repelling a on a portion of the eastern highwall, which is currently covered in rockfall protection drapery. The drapery was installed for the protection of workers excavating rock for the eastern bridge pier.   The drapery was installed by Pacific Blasting in association with Hoover Construction.  Some pictures from our drapery inspection visit are below.

For more information about the project, click here, and for our previous blog posts on this project, click here.

John and Paul provide some scale to this picture as they work their way down the drapery.

 John concentrating as he inspects the drapery seam as he decends.

Deep Foundations Events Update–October 2013

As involved as we are in the deep foundations industry (and just returning from the DFI annual conference), it seemed appropriate to take time to highlight several upcoming events in the industry.  All of these are great opportunities to get PDH credits, do some networking, and build relationships in the deep foundations industry.  Most are cooperative efforts of one or more of the G-I, DFI, PDCA, and ADSC.  All of them have a line-up of great speakers that are leaders in the industry.  Click on the links below to learn more about each one. 

 

14th Annual Design and Installation of Cost-Efficient Piles Conference
Wednesday, October 23, 2013
Sheraton North Houston, Houston, TX

The DICEP conference will present modern approaches to maximize Efficiency, Effectiveness and Economy (E3) of driven piles through a series of presentations including driven pile design, testing, evaluation and case studies.  Steel sheet pile design and corrosion protection are also addressed.

 

 

Drilled Shaft Foundations Seminar – Reliability in Drilled Shaft Foundations
Thursday, November 7, 2013
Hilton Midtown, New York, NY

The program will feature presentations by leading industry design engineers and civil engineering contractors on some problems encountered with drilled shaft foundations and how those problems were solved.

 

 

Driven Pile – A Foundation for the 21st Century
Wednesday, November 13, 2013
Loews Vanderbilt Hotel, Nashville, TN

  • A one-day specialty seminar on driven piles
  • Featuring 11 presentations by key industry professionals
  • Provides 6 PDH credits for all participants, including 1 PDH on Ethics  

 

 

Here are few open Calls for Abstracts (by order of due date):

IFCEE 2015 – March 17-21, 2015 – San Antoniio, TX – Due October 28, 2013

DFI 39th Annual Conference on Deep Foundations – October 21-24, 2014 – Atlanta, GA – Due January 10, 2014

DFI Superpile 2014 – June 19-20, 2014 – Cambridge, MA – Due February 3, 2014