Figure 14 : Typical south approach launch phase
Once the final launches were completed , the temporary king posts , bearings and guides all had to be removed .
Installation of the permanent bearings and final internal slabs followed before the construction of the in-situ reinforced deck could commence .
4.4 NAV assembly and launch
The North Approach Viaduct steelwork was similarly assembled and welded on stillages behind the abutment as the South Approach . However the North Approach is only 221m in total length , and was launched after full assembly as a single element in the steel only condition .
These spans comprise a 75m length of twin box in the first span , a transition segment , and 146m of single box complete with stay anchor webs , which connects to the cable stayed north fan .
Figure 15 : SAV box girder and king post Figure 16 : SAV Complete
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