In order to construct the new Willamette River Bridge, crews need to reach the riverbed to build the bridge foundations. It would be impossible to work safely to drill shafts and install the bridges piers fighting the river’s current. But by building cofferdams, temporary steel or wooden enclosures that keep water and soil out of the work area, the crews can safely and quickly complete their work – all with the water whizzing by.
On the WRB, crews built nine cofferdams for column construction. Once the columns are complete, crews remove the cofferdams, letting rock and dirt fill in around the base of the columns.
 |
| Workers build a column inside a cofferdam on the Willamette River's north bank. |
Now that the foundations are complete and the arches are taking shape, we’re approaching another milestone: by the end of summer, crews will remove all but one the project’s cofferdams.
The cofferdam located in the center of the river at the base of the two arches will remain until the bridge is complete.
 |
| This cofferdam protects workers as they install rebar for bridge arches in the center of the river. |
Tidak ada komentar:
Posting Komentar