e-mosty June 2018 American Bridges American Bridges | Page 13

Figure 21 and 22: Floating batch plant
THE MAIN SPAN TOWERS
The towers are constructed in successive segments
with the assistance of mobile eight jump forms. They
are used simultaneously – each tower requires 26
jumps in total, with each jump rising between 12 and
18 feet, see Figures 23 and 24.
The forms follow the slight outward angle of the
towers as they continue upward. As they rise, the
walls of the forms are narrowed to shape the
decreasing perimeter of the towers.
Forming the horizontal bar of the H-shaped towers
are crossbeams. They are securing the outward-
angled towers and serve as the underpinning of the
concrete road deck.
Figure23: Tower construction with the aid of the jump forms
Figure 24: Jump Forms
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