Loisach Bridge Ohlstadt
Coordinates: 47 ° 37 ′ 38 " N , 11 ° 12 ′ 15" E
 Loisach Bridge Ohlstadt
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| Convicted | Federal motorway 95 | |
| Subjugated | Loisach | |
| place | Ohlstadt | |
| construction | Prestressed concrete - T-beam bridge | |
| overall length | 1315 m | |
| width | 2 × 15.0 m | |
| Longest span | 70.96 m | |
| Construction height | 1.7 m to 3.0 m | |
| height | 9 m | |
| start of building | 1970 | |
| completion | 1972 | |
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The Loisachbrücke Ohlstadt is with 1315 m the longest bridge in the state of Bavaria .
The structure is part of the federal motorway 95 and is located in Upper Bavaria between the motorway junctions Murnau am Staffelsee and Eschenlohe . To the west of Ohlstadt, it spans the Loisach valley with 40 fields at a maximum height of 9 m and further streams as well as the state road 2562 to Ohlstadt and the federal road 2 from Munich to Garmisch-Partenkirchen.
In the area of the bridge at the north abutment, the freeway route has a radius of 1300 m, beginning in the plan, turns into a turning clothoid (A = 500) in the middle of the bridge , followed by an arc with a radius of 2000 m. The overpass was built with two separate superstructures for the two carriageways between 1970 and 1972. From April 2013, the bridge was renovated for two years. The road surfaces, the bridge bearings and protective devices were renewed.
Foundation and substructures
Due to the geological conditions when crossing the Murnauer Moos , the abutments and pillars have a deep foundation . This consists of a total of 1182 in-situ concrete driven piles , which, with a diameter of around 50 cm , are founded on gravel layers at a depth of 13 m to 22 m .
The pile head foundations for the maximum 7 m high pillars were created within a sheet pile wall box. The pillars are made of reinforced concrete and have a circular full cross-section with a diameter of 1.2 m. There are usually four supports in the pillar axes, two each for a superstructure. The pillars next to the main opening over the Loisach are designed as pillar discs.
Superstructures
The two adjacent superstructures of the prestressed concrete bridge have a continuous beam in the longitudinal direction and are divided into three independent sections with two expansion joints . Fixed points are two pillars in the middle of the section. In the transverse direction, the 15 m wide superstructures are usually designed as two-web T-beam cross- sections with a construction height of 1.7 m, without cross girders in the column axes. In the Loisach area with a main span of 71 m, a box-girder cross-section with a variable construction height of 1.7 m to a maximum of 3.0 m is arranged over the length of three bridge fields above the pier discs. The prestressing consists of internal tendons in the longitudinal direction .
The spans for the 40-span bridge superstructure for the Garmisch carriageway are 20 × 31.10 m + 70.96 m + 2 × 31.10 m + 2 × 41.47 m + 7 × 31.10 m + 44.27 m + 28.30 m + 6 × 31.10 m. Due to the oblique intersections with the streams and roads, the spans and number of fields of the second superstructure differ. This has 39 fields and spans of 3 × 41.47 m + 17 × 31.10 m + 70.96 m + 2 × 41.47 m + 8 × 31.10 m + 22.80 m + 44.27 m + 6 × 31.10 m.
Construction work
The superstructures with T-beam cross-section were constructed in sections, mostly on a weekly basis, with two advancing armatures. In the 31.10 m long fields, the armor was stored on support towers next to the pillars. In the longer fields, one scaffold also had an auxiliary support in the field, the other scaffold had auxiliary bracing over two 5 m high auxiliary pylons. The superstructure sections with box girder cross-section were concreted in the edge fields on falsework , in the main field over the Loisach in cantilevered cantilever construction with 5 m sections.
literature
- GU Theimer: Construction of the Loisach Bridge near Ohlstadt. In: Die TIEFBAU Berufsgenossenschaft. 84th year, May 1972, No. 5, pp. 214-220.
Web links
Individual evidence
- ↑ Now it's the turn of the second bridge. Merkur-online.de, April 1, 2013, accessed April 6, 2013 .
- ↑ A 95: Two construction sites slow down the traffic. Merkur-online.de, April 3, 2013, accessed on April 6, 2013 .