In part 2 of our series, we showed you how the arches were jacked apart to support their own weight. We’ll now explain the final step.
Even during a dusting of winter snow, crews remained hard at work. The photo above shows them preparing to pour concrete to close and connect the ribs using the same concrete cocktail of small aggregate and water reducers that was used for the reinforcement cages. After seven days, the concrete reached its intended strength and the falsework could be removed.
In January, once the arches could stand on their own, crews used cranes to dismantle the wooden forms and steel support system. All of the material is being saved and reused to build the arches for the northbound I-5 bridge.
With all the falsework now removed, the weight of the arches is fully supported by the large concrete shafts that were poured deep in the ground on either bank and in the middle of the river, revealing the beauty and grace of the new bridge yet to be.
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