Planning
for the Railway - Bridge structure execution planning
 If
the DB AG builds a new bridge under an existing line, renews an existing
bridge or at the request of the road construction company widens a bridge
because of larger thoroughfare width, it must always build under traffic
- "under rolling wheel". A diversion for a longer time is not
possible in the normal case. Construction under traffic requires a great
expense of auxiliary construction measures, which naturally also drive
up construction costs considerably.
It is not unusual that the share of the construction
costs for the pure creation of the bridge structure amounts to only 1/3
of the total costs and the remainder of the construction costs is incurred
by shuttering measures, auxiliary bridges, insertion, construction in
night and weekend breaks and for further measures for maintaining the
traffic.
In addition to these increased construction costs
the Germany Railway calculates so called operating impediment costs, costs
due to slow running, due to rail substitution traffic and due to increased
labour costs for maintaining the traffic.
Together with the Komm company a construction method
was developed already in 1989 that was patented under the designation
"Method and equipment for inserting structural members, especially
bridge structural members" (Patent No. 94 19449).
With our patented method for inserting railway bridges
around 200 bridges with dimensions of up to 70 x 40 m and weights up to
7,500 t have been inserted. The structures can be moved exactly in height
and position with an insertion speed of around 10 m/h and an insertion
force of around 3% of the dead weight.
It represents from the railway operating viewpoint
and from an economic viewpoint a very good construction method for producing
railway overbridges, proven in the meantime by a large number of completed
structures. The essential advantage compared with other construction methods
lies in minimizing the railway-relevant construction time for the substructures
and the resulting reduction of the operating impediments.
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