View All Posts

Apr 20

Bridge Piling Installation nearing Completion, Fabrication of Girders and Box Culverts Ongoing

Posted on April 20, 2018 at 1:18 PM by Kirsten Freeborn

Posted on April 20, 2018

 Over the past two weeks, quite a bit of work has been completed on the 48 Avenue Bridge Replacement project, both here in Camrose as well as off-site.

 Starting on April 9th, PSA’s pile driving sub-contractor has now completed installation of the steel pilings on the east side of the new bridge, and is well underway to completing installation of the pilings on the west side.  The locations for each of the 62 steel pilings that were used for this project were precisely surveyed before the start of installation, and were measured multiple times during the installation to ensure that they were driven vertically into the ground.  The pilings used for the east and west bridge abutments were driven approximately 21 metres into the ground so that they could be embedded about 1 metre into the underlying bedrock.  Because of the significant length of the pilings, the pilings were installed in two sections with the top section being welded onto the bottom section before the pile driving operation resumed.  The top of each steel piling was galvanized to prevent long-term corrosion of the steel.

 Once all of the pilings are installed, PSA will begin installation of the abutment cap, which will sit on top of the abutment pilings and upon which the concrete bridge girders will rest.  Over the next two weeks, PSA will begin work on fabricating / installing the back walls and wing walls, which will be installed on the outsides of the bridge pilings (i.e. on the side away from the water) to prevent the future road structure from spilling into the lake at the bridge opening.  PSA will also begin cleaning out the lake bed within the bridge opening (i.e. between the east and west bridge pilings) to remove loose organic material, and installing additional large rocks (rip rap) between the pilings to prevent water flowing under the bridge from damaging the bridge or the roadway.  Work on this component of the project will begin shortly, and will likely continue until early June.

 PSA and AMEC have also advised the City that fabrication of the concrete box culvert pieces is going well, and should be complete by the end of April.  Based on the current construction schedule, these pieces will be delivered to Camrose in mid-May, at which time PSA will begin installation of the pedestrian underpass.  This installation will take about a month to complete, and should be done by mid-June.

 Finally, PSA and AMEC have advised that fabrication of the concrete bridge girders is still on schedule for a tentative completion in early to mid-May.  As these are to be installed in June and early July, fabrication on these pieces will be complete in time for the installation to begin.

Here are a few photos of the recent pile driving operations, as well as the off-site fabrication of concrete box culverts (for the pedestrian underpass) and the bridge girders:

Blog Photo 1

April 9th – Flags indicating the locations where the pilings are to be installed on the east side of the new bridge

Blog Photo 2

April 10th – Installation of the bottom sections of the pilings on the east side of the bridge

Blog Photo 3

April 11th – Placement of the top sections onto the bottom sections of the pilings on the east side of the bridge.  These sections were welded together prior to resuming piling operations.  Note the top portion of the pilings are galvanized (grey in colour) to prevent the steel from corroding over time.

Blog Photo 4

April 18th – Installation of the pilings is complete on the east side of the new bridge.  The contractor has already installed the bottom piling sections on the west side of the new bridge, and is starting to lift the top sections into place for welding.

Blog Photo 5

April 10th – A few of the completed concrete box culvert pieces in a storage yard near Red Deer.  The full rectangular pieces will be installed under the new roadway, while the angled piece seen at the right of the photo will be installed near the entrances to the underpass.  Note that the weight of one of the completed box culvert pieces is over 26,000 kilograms (refer to the stamp near the bottom corner of the piece).

Blog Photo 6

April 9th – Three of the completed concrete bridge girders in a storage yard near Blackfalds.  The steel loops located on the tops of the girders are to allow these heavy girders to be lifted, and will be cut off by PSA once the girders have been placed on the abutment caps.
Blog Photo 7

April 11th – Fabrication of one of the concrete bridge girders in an indoor facility near Blackfalds.  This photo was taken shortly before concrete was poured into the mold.  Note the steel rebar throughout the girder that will help provide strength to the new bridge girders.  The cylindrical tubes running along the length of the girder help reduce the total weight of the girder.  These have been designed to reduce the overall cost of the girder, without sacrificing the strength of the girder or its future performance.