|
Even though it will be several months before residents see the main span of the new bridge put into place, the structure is already being created. For example, large forms (like the one pictured above) will be used to cast the concrete segments comprising the main span of the bridge. The forms are being built in the casting yard along the unused section of I-35W just north of Washington Avenue. They rise about three stories above the casting beds, which are the curved, ramp-like structures that appear side-by-side on the old freeway.
Shortly after the holidays, concrete will be poured into the forms to make the box girder segments that will fit together to form the main span of the bridge. Eventually, there will be eight casting beds and at least four forms. After the first segments are poured at one end of the casting bed, the forms will be removed and placed for the next segment. This method of casting segments is called "longline" casting. A rolling, heated enclosure will help keep the concrete and the workers warm throughout the casting process.
Construction UpdateFirst footing poured Dec. 17
On Monday morning, Dec. 17, the first concrete was poured at the footing for Abutment 1 on the south side of the construction site. All went well, and the concrete is now curing.
Foundation work is half doneConstructing the bridge foundations by drilling shafts and filling them with concrete will continue until early February. One hundred nine shafts will be drilled before this work is complete. Currently about 20 shafts have been completed.Excavation to begin at Pier 3Excavation work to prepare for construction of the footing for Pier 3 on the north side of the river will begin next week.
Expect lights at night and some drilling on Sundays
Lights may be noticeable from 6 p.m. to 4:30 a.m. as drilling crews work occasional second shifts. Drilling work may also occur on Sundays to take advantage of good weather and make best use of equipment. Christmas Day will be the only day since construction began Oct. 8 that no work occurs at the construction site.See more at the new Bridge Project WebsiteStory from: Minnesota Department of Transportation
Photo by Michael Kuchta, North Central States Regional Council of Carpenters