e-mosty March 2019 Long Span and Multiple Span Bridges | Page 11
Figure 9: Ground improvement for tower foundations
Wall panels are pre-assembled and lifted into
position. They are connected with horizontal block
joints, welded skin plates and bolted splice
connections of the longitudinal stiffeners.
the decks of the approach viaducts at each end.
This means that they are set back from the end of
the 770m suspension bridge side spans.
The suspension cables are formed of PPWS –
Prefabricated Parallel Wire Strand – which are
continuous between the anchorages. The tie-
down, each comprising 4 No. tensioned bars, is
clamped to the main cable and transfers load
directly to the piled foundation of the side span
pier.
This method enables fast construction with the
possibility to erect further blocks above before
finalising welding works.
Anchorages and Cables
The ground conditions for the anchorages are
critical in order to resist the massive forces from
the suspension cables.
Superstructure
The deck of the bridge will be at a maximum height
of 72.8m creating a clearance of 70 x 1600 m, and
will have a total width of 45.06m and an overall
depth of 3.5m. It will carry six lanes (three in each
direction), together with a maintenance walkways
on each side.
There is weak soil on both the European and Asian
shorelines, so the side spans were increased to
take advantage of founding the anchor blocks
within the Miocene rock further from the shore.
Like the Osmangazi Bridge, the anchorages are
designed to minimise their height so that the
tension forces are transmitted directly to the
foundation blocks, reducing the over-turning
moment. The anchorages are positioned below
The bridge deck comprises two stiffened steel box
girders spaced 9m apart, connected by 3.5m deep
cross-girders every 24m.
Figures 10 and 11: Ground conditions – anchor blocks
1/2019