Compared to the graceful arches that span the Willamette River, the concrete bridge deck may seem straightforward and simple, yet it is much more than a flat slab of concrete. Here’s a description of how contractors poured the southern section of the Whilamut Passage Bridge deck that stretches over Franklin Boulevard last week.
After completing construction of the box girders that support the deck, crews added wooden falsework to maintain the hollow box structure. Then they installed steel reinforcements on top of the box girders before pouring the concrete.
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| Manske Construction Corporation created two layers of gridded rebar that are carefully spaced for added strength. |
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| The ironworkers used different sizes of steel rebar, set at a variety of angles, to reinforce different sections of the deck. Notice the large rebar used for a joint located above a bridge column. |
Once the rebar was installed, spaced and tied together, contractor Knife River pumped concrete to the bridge deck from trucks parked on Franklin Boulevard. A specially trained operator used a Bid-Well machine to distribute, flatten and smooth the concrete.
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| The Bid-Well follows right behind the freshly pumped concrete. Crews moisten the material before it's distributed to allow for a wet cure. |
After the fresh concrete cures for 14 days, crews will post-tension the new bridge deck and let the concrete cure for another 120 days to allow for natural shrinkage and greater strength.
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