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Bridge scour prevention
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Bridge Scour Prevention

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Bridge scour prevention

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Bridge Scour Prevention

Presentors:

Tom Hardinger – Wisconsin DOT

Eugene Hietpas – Collins Engineers Inc.

This presentation and its contents may not be duplicated or reproduced without the expressed written consent of Collins Engineers, Inc.


Bridge scour prevention

NC Region Various Structures – Structures B-37-0187, B-71-0018, B-49-0090

Background Information

Design Phase

Construction Phase

As-Builts


Background information

Background Information

  • Project included 3 bridges over Wisconsin River (Marathon, Portage and Wood Counties in central Wisconsin).

  • Substructure units are conventional seal, footing and pier walls.

  • Major flood events 2008, 2010 and 2011.

  • Post-flood dive inspections revealed major scour issues with streambed and/or substructure undermining.

  • Project initiated in 2011 and built in late 2012.


B 37 187 sth 34 knowlton

B-37-187, STH 34, Knowlton

  • Built 1969.

  • Multi-span steel girder spans.

  • 20-38’ water depth.

  • 8-10’ streambed degradation during 2008 flood exposed seal-to-rock interface. Mitigated piers 2 and 3.


B 49 90 cth hh stevens point

B-49-90, CTH HH, Stevens Point

  • Built 1999.

  • Multi-span pre-stressed girder spans.

  • 8-15’ water depth.

  • Pier 4 Seal undermining at upstream nose.


B 49 90 existing condition

B-49-90 Existing Condition


B 71 18 sth 73 nekoosa

B-71-18, STH 73, Nekoosa

  • Built 1962.

  • Multi-span steel girder spans.

  • 15-22’ water depth.

  • Localized scour at piers 2 thru 6.


Design considerations

Design Considerations

  • Permanent vs. Temporary Repairs.

  • Alternatives.

    • Conventional Riprap placement.

    • Articulated grout mats/grout bags and structural grout.

  • Traffic disruptions.

  • Environmental.

  • Project Inspection - Most work underwater.


Design challenges

Design Challenges

  • Limited WDOT history/experience (design and construction).

    • HEC 23 guidelines.

    • Input from other states: Montana, Iowa, MN.

    • Input from industry.

  • Environmental.

    • Aquatic bed impacts.

  • Development of Specifications.


Project detail of scour repairs

Project Detail of Scour Repairs


Project 1009 45 65

Project 1009-45-65

  • Designed by NCR and BOS.

  • Let August 14, 2012.

  • Cost $532,111.

    • Scour Repair Grout: $4,829/CY (6 CY).

    • Grout Bags: $482/CY (402 CY).

    • 4 “ Grout Mats: $837/CY (256 CY).

  • Contractor: JF Brennan Company, La Crosse.


Bridge scour prevention

NC Region Various Structures – Structures B-37-0187, B-71-0018, B-49-0090

  • Construction

    • 3D Imaging

      • Design Phase/Pre-construction

      • As-Builts


The challenge

The Challenge

  • Can You See Me Now?


Installation layout

Installation/Layout

  • Issues


As builts

As-Builts


As builts1

As-Builts


As builts2

As-Builts


Questions

Questions

Contact:

Eugene Hietpas

[email protected]

Tom Hardinger

[email protected]


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