Key Erection Techniques of Steel Box Girders in Zones Without Hanger Cables of 1915 Canakkale Bridge
The 1915 Canakale Bridge in Turkey is a two-tower suspension bridge with a main span of 2 023 m.The superstructure consists of 3 563 m-long steel box girders,of which,the steel box girders in the side spans and the zones without hanger cables are not standard segments,with lengths varying from 9.8 to 43.6 m and weights varying from 344 to 1 330 t.During construction,multiple girder hoisting and erection techniques were utilized.For the girder segment S33,bespoke corbels were prepared to facilitate the positioning and launching operation.To ensure the controlled welding quality of the segments S32 and S31 in the side span,temporary hanger cables were installed to allow smooth working procedure shift.For the segments S01,T00 and M01 in the tower zones,a tailored three-way adjustable support and guide frame were prepared to ensure the safe hoisting and accurate positioning of the girder segments.The erection of segments S02 and M02 in the tower zones was restricted by the already-erected segments,in this case,a swing system was used,which helped achieve the large-angle swing and erection of the segments by the main-cable-supported cranes.The utilization of other devices and measures,including the hanger cable tuning devices,pull-back system in side spans and synchronized girder segment lifting by four main-cable-supported cranes,ensured the smooth assembly and welding of the segments S01,T00,and M01.
suspension bridgesteel box girdergirder in zone without hanger cablesswing systempull-back system in side spansynchronized lifting by multiple main cable-supported cranesconstruction technique
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