Figure 21 : Deck section is lifted up on Central Tower Figure 22 : Segment between SAV and South Tower
5.3 Erection Travellers
The main frame of the ET is a single truss , with primary members consisting of I-section plate girders with flanges in the vertical plane . Two front and rear supports to the main frame are spreader beams on longitudinal beams . The lifting jack carriage tracks backwards and forwards along the top flanges . Movement is achieved with a pinned twin cylinder launching jack system .
Upon completion of segment erection , removal of each ET had to be done piece-meal owing to its location between the permanent stays with adequate protection provided to the cable stays .
Figure 23 : Erection traveller
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