BAS 92268
Loisach Bridge Ohlstadt
11.08.2009
© Alexander Z. (Wikipedia)
Creative CommonsKeine weiteren Bilder verfügbar
Germany
Bavaria
Ohlstadt
Loisach
A95 motorway
Beam bridge
concrete
1970 bis 1972
70.96 m
1315.00 m
29.00 m
9.00 m
0.00 m
0.00 m2
in operation
Wikipedia:
The Loisach Bridge Ohlstadt, at 1315 m, is the longest bridge in the Free State of Bavaria.
Foundations and Substructures
Due to the geological conditions at the crossing of the Murnau Moor, the abutments and piers have deep foundations. These consist of a total of 1182 cast-in-place concrete driven piles, which, with a diameter of approximately 50 cm, are founded on gravel subsoil at depths of 13 m to 22 m.
The pile head foundations for the piers, which are up to 7 m high, were constructed within a sheet pile cofferdam. The piers are made of reinforced concrete and have a circular solid cross-section with a diameter of 1.2 m. Typically, four columns are positioned along the pier axes, two for each superstructure. The piers adjacent to the main span over the Loisach River are designed as pier slabs.
>Superstructures
The two adjacent superstructures of the prestressed concrete bridge utilize a continuous beam as their structural system in the longitudinal direction and are divided into three independent sections by two expansion joints. Fixed points are located at the midpoint of each section at two piers. In the transverse direction, the 15 m wide superstructures are generally designed as two-webbed plate girder cross-sections with a structural depth of 1.7 m, without crossbeams in the column axes. In the area of the Loisach River, with a main span of 71 m, a hollow box girder cross-section with a variable structural depth of 1.7 m to a maximum of 3.0 m above the pier walls is arranged over the length of three bridge spans. The longitudinal prestressing consists of internal tendons.
The span lengths for the 40-span bridge superstructure of the Garmisch-bound carriageway are 20 times 31.10 m + 70.96 m + 2 times 31.10 m + 2 times 41.47 m + 7 times 31.10 m + 44.27 m + 28.30 m + 6 times 31.10 m. Due to the oblique angles of the crossings with the streams and roads, the spans and number of spans of the second superstructure differ from these. This structure has 39 bays and spans of 3 times 41.47 m + 17 times 31.10 m + 70.96 m + 2 times 41.47 m + 8 times 31.10 m + 22.80 m + 44.27 m + 6 times 31.10 m.
Construction execution
The superstructures with slab girder cross-section were constructed section by section, mostly on a weekly basis, using two launching systems. For the 31.10 m long bays, the girders were supported on columns alongside the piers. For the longer spans, one structure had an additional temporary support in the span, while the other structure had temporary bracing via two 5 m high auxiliary pylons. The superstructure sections with hollow box girder cross-sections were concreted on temporary support structures in the outer spans, and in the main span above the Loisach River using cantilever construction with 5 m sections.
The Loisach Bridge Ohlstadt, at 1315 m, is the longest bridge in the Free State of Bavaria.
Foundations and Substructures
Due to the geological conditions at the crossing of the Murnau Moor, the abutments and piers have deep foundations. These consist of a total of 1182 cast-in-place concrete driven piles, which, with a diameter of approximately 50 cm, are founded on gravel subsoil at depths of 13 m to 22 m.
The pile head foundations for the piers, which are up to 7 m high, were constructed within a sheet pile cofferdam. The piers are made of reinforced concrete and have a circular solid cross-section with a diameter of 1.2 m. Typically, four columns are positioned along the pier axes, two for each superstructure. The piers adjacent to the main span over the Loisach River are designed as pier slabs.
>Superstructures
The two adjacent superstructures of the prestressed concrete bridge utilize a continuous beam as their structural system in the longitudinal direction and are divided into three independent sections by two expansion joints. Fixed points are located at the midpoint of each section at two piers. In the transverse direction, the 15 m wide superstructures are generally designed as two-webbed plate girder cross-sections with a structural depth of 1.7 m, without crossbeams in the column axes. In the area of the Loisach River, with a main span of 71 m, a hollow box girder cross-section with a variable structural depth of 1.7 m to a maximum of 3.0 m above the pier walls is arranged over the length of three bridge spans. The longitudinal prestressing consists of internal tendons.
The span lengths for the 40-span bridge superstructure of the Garmisch-bound carriageway are 20 times 31.10 m + 70.96 m + 2 times 31.10 m + 2 times 41.47 m + 7 times 31.10 m + 44.27 m + 28.30 m + 6 times 31.10 m. Due to the oblique angles of the crossings with the streams and roads, the spans and number of spans of the second superstructure differ from these. This structure has 39 bays and spans of 3 times 41.47 m + 17 times 31.10 m + 70.96 m + 2 times 41.47 m + 8 times 31.10 m + 22.80 m + 44.27 m + 6 times 31.10 m.
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