HomeMy WebLinkAboutTrans 2014-06-09 Item 2A - Discussion - 2014 Bridge Inspections - 196th-200th Street Bridge Repair Using King County Discretionary AssistanceCity of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
TO: Mayor Haggerton
FROM: Bob Giberson, Public Works Director
By: Grant Griffin, Senior Program Manager
DATE: June 6, 2014
SUBJECT: 2014 Bridge Inspections - 196th - 200th Street Bridge Repair
Project No. 91410402
King County Discretionary Assistance
ISSUE
Pursue a project to repair the approach slab seat on the west end of the Tukwila /Kent,
jointly owned, 196th -200th Street Bridge under the 2014 Bridge Inspection Program,
using the King County Discretionary Work Program.
BACKGROUND
The approach slab seat on the west end of the 196th -200th Street Bridge has
sustained damage due to slab foundation fill settlement and resulting slab movement.
The west end sidewalks approaching the bridge have also sustained damage due to
pressure from the approach slab movement.
DISCUSSION
The approach slab fill settlement has been recorded on the routine bridge inspection
report for a number of inspection cycles. Settlement has allowed the slab to rotate at
the connection to the west bridge abutment causing concrete spalling and a bump at
the bridge approach. The movement caused buckling of the sidewalk on the
southwest corner of the bridge and was reported to Public Works on May 29, 2014.
The settlement has reached the point where a repair is necessary for public safety and
to protect the bridge from further damage. The King County Bridge Structural Engineer
has inspected the bridge and determined that no restrictions are necessary as we
pursue the repair project.
FISCAL IMPACT
This project is in the early stages of development and repair options are being
determined and estimates prepared. The cost of the work is expected to fall within the
budget of the 2014 Bridge Inspection Program. Updates to the committee will be
presented as the information becomes available.
RECOMMENDATION
Information only.
Attachments: Vicinity Map
Bridge Inspection Report
W:1PW Eng1PROJECTSW- RW & RS Projects\Bridge Inspection Programs\Bridge Inspections 2014 (91410402)1196th_200th Bridgellnfo Memo King Co Discretionary 196th - 200th Bridge - sb.docx
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Project Site
196TH — 200TH Street Bridge
VICINITY MAP
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Project Site
196TH — 200TH Street Bridge
VICINITY MAP
196th -200th Street Bridge — Federal Structure Identifier 8712100
Inspection on June 2, 2014 by Tukwila Public Works, Grant Griffin and Scott Moore.
Tukwila Road Maintenance requested an engineering review of the situation on the west end of the
196th- 200th Street Bridge that had caused the sidewalk to buckle on the Southwest approach. Review of
the bridge revealed an ongoing problem of roadway fill settlement causing unanticipated movement of
the west approach slab. This movement has caused damage to the approach slab seat and a bump at
the slab bridge transition.
Further investigation and analysis of the bridge plans indicate that no traffic restrictions are necessary
but that a repair project is warranted to prevent further damage. The King County Bridge Structural
Engineer has inspected the damage and is in concurrence with this assessment.
See detailed photos of the damage below:
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1- Settlement top of traffic barrier above NW corner abutment — approach slab interface.
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2- Void behind West Abutment wall Spalling Concrete where slab connection is failing.
Construction falsework is still in place. Void is approx. 10 feet deep or more. Reinforced fill on
roadway side is supporting approx. two - thirds of the slab but is able to rotate causing spalling of
the outside edge of the approach slab seat. No movement visible with traffic loads. Settlement
is happening for the entire width of the bridge.
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3- Settlement of slab on SW corner. Barrier with Fractured Fin finish visible. Initial settlement
marked to track additional settlement. Void and falsework to left is same location as picture
No.2 above.
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4- View of void on NW corner. Slab settlement and falsework visible. Abutment wall column at left.
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5- Slab settlement on NW Corner. Location above void shown in photo No.3
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