Presentation on theme: "Presentors: Tom Hardinger – Wisconsin DOT Eugene Hietpas – Collins Engineers Inc. This presentation and its contents may not be duplicated or reproduced."— Presentation transcript:
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.
NC Region Various Structures – Structures B , B , B Background Information Design Phase Construction Phase As-Builts
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 Post-flood dive inspections revealed major scour issues with streambed and/or substructure undermining. Project initiated in 2011 and built in late 2012.
B , STH 34, Knowlton Built Multi-span steel girder spans water depth streambed degradation during 2008 flood exposed seal-to-rock interface. Mitigated piers 2 and 3.
B-49-90, CTH HH, Stevens Point Built Multi-span pre- stressed girder spans water depth. Pier 4 Seal undermining at upstream nose.
B Existing Condition
B-71-18, STH 73, Nekoosa Built Multi-span steel girder spans water depth. Localized scour at piers 2 thru 6.
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 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 Designed by NCR and BOS. Let August 14, 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.
NC Region Various Structures – Structures B , B , B Construction 3D Imaging Design Phase/Pre-construction As-Builts
The Challenge Can You See Me Now?
Questions Contact: Eugene Hietpas Tom Hardinger