SEGMENTAL BRIDGES-PARÇALI KÖPRÜLER

CONFEDERATION BRIDGE     8 Mil uzunluğundaki köprü Kanada'daki Prince Edward adası ile New Brunswick bölgelerini birleştirmektedir.Dünya'daki yüzeyi suyla kaplanan en uzun köprüdür.Yılın 5 ayında köprü sular altında kalmaktadır.Tasarımcılar buzlanmayı önlemek ve bunları köprü yüzeyinden ayırmak için köprü yüzeylerine 52 derecelik açı oluşturmuşlardır.Bu buz kütleleri hem köprüye ağırlık vermekte hemde hacim genişlemesi sonucu köprüyü deformasyona zorlamışlardır. *Ömrü: 100 years *Yapı malzemeleri:Betonarme yapı,Öngerilmeli beton *Uzunluğu: 12.9 km , Genişliği:11 m her iki taraftaki emniyet şeritleri hariç *Yüksekliği: Su seviyesinden 40 m *Köprü ayakları: Agırlık temel ve taş temel

ROOSEVELT KÖPRÜSÜ PROJESİ     The New Roosevelt Bridge in Stuart is a twin segmental box girder bridge with over 560,000 square feet of bridge deck. This structure replaces two aging bascule spans, the Northbound which opened in 1934 and the Southbound in 1964. The older span, Northbound, is being removed and taken out approximately seven miles offshore and dumped into the ocean to become an artificial reef. The newer span, Southbound, is being retained for local traffic and is scheduled for a complete rehab when the new bridge is completed.

The project began in April, 1994. The project finished ahead of schedule, and had an opening date of November 1, 1997. With 1112 segments required for the project, it was necessary to cast the segments in White City (15 miles North) and transport them to the site. Due to the "S" configuration of the bridge, no two segments are the same. This required careful monitoring and close coordination with the contractor's reinforcing and post tensioning operations. A 546 foot long fishing pier was constructed at the water line under the bridge connecting Flagler Park and the City Riverwalk. The fishing pier utilizes the bridge footings as fishing platforms with benches, lighting, and decorative railings. The bridge has several unique features: Drainage of the bridge is completely contained inside the bridge via fiberglass pipes where it is then piped to either end into retention ponds. The bridge was built using cantilever type construction with an overhead gantry crane , which was necessary due to the shallowness of the St. Lucie River. The gantry was approximately 430 feet long and 30 feet high which allowed it to complete two spans before having to be moved. The interior is completely open which has allowed a golf cart to be placed inside each bridge for ease of maintenance. A special class 5 concrete microsilica mix was used in the high corrosion zone giving the bridge a 75 year lifespan (Yukarıdaki metni türkçeye çevirmeden orjinal hali ile yayımlıyorum)

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