columns, fleeted forward two spans and then rolled back into its position bet- ween the next pair of columns. This was achieved with sets 59m long, weighing 163t, the movement carried at high level on trestling.
Since span construction was from third point to the corresponding point in the next span, two girder sets were The units were set to level and slope used, each consisting of two 2m deep on hardwood packs on the girder set welded plate girders in high yield steel flanges. These packs incorporated slid- braced together at 5.2m centres. On ing bearings to allow a span to be stress- completion of a span, the rear set was ed back to the live structure and permit rolled sideways to clear the tapering free thermal movement until the span
was self-supporting. In addition, to adjust a completed span to level before in-situ jointing and to release the girder set after the completion of a span, the contractors designed sandjacks up to 810t safe-working-load. Eight of these were located on the trestle heads be- neath the girder set.
Independent structures
The ground level traffic system on a 980m long section, section 6, precluded
Elevated roundabout and flyover at White City
Far East BUILDER, November 1970
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