To build the arches of the northbound I-5 Willamette River Bridge, crews will tie massive cages of steel rebar, build formwork mold and pour tons of concrete. But the materials that will ultimately support the entire weight of the bridge won’t be able to support themselves until the concrete cures. Until then, they’ll be supported by steel towers, which are being installed over the course of the next two months.
Steel towers that supported construction of the southbound bridge arches were saved for use on the northbound bridge. Reusing the towers saves time and money, and the steel will be recycled or reused for other construction when the arches are complete.
After workers anchor the towers to the work bridge, they will weld steel beams in place over the towers. Large wood beams on top of them will form the work platform for arch construction.
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| Arches begin to form from the south side of the river. Their falsework is supported by the steel tower on the work bridge. Steel piles driven in the river also support arch construction. |
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| Ironworkers use the wooden platform to install and tie the rebar. They will build wooden forms around the rebar cages to create the fram needed to pour the concrete. |
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| The first steel tower was installed on the work bridge on the north bank of the river. Construction of the falswork shown on the right rises above the work bridge toward the first tower. |
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