Hohenwarthe Elbe Bridge
Coordinates: 52 ° 13 ′ 15 ″ N , 11 ° 42 ′ 15 ″ E
 Hohenwarthe Elbe Bridge
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| Convicted | Federal motorway 2 | |
| Crossing of | Elbe | |
| place | Hohenwarthe | |
| construction | Composite steel bridge | |
| overall length | 1170.11 m | |
| width | 2 × 19.25 m | |
| Longest span | 140.71 m | |
| Construction height | 4.0 m - 7.1 m | |
| building-costs | 107 million DM | |
| start of building | 1994 | |
| completion | 1997 | |
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The Elbe Bridge Hohenwarthe is with 1170 m the longest bridge construction of Highway 2 . It spans the Elbe and the diked foreland north of Magdeburg near Hohenwarthe at river kilometer 338.60 . The bridge train was first built between 1935 and 1936 as a section of the Reichsautobahn Berlin-Hanover and opened to traffic on January 10, 1937. As part of the six-lane expansion of Federal Motorway 2 ( German Unity Transport Project No. 11 ), the old bridge was replaced by a new one between 1994 and 1997.
Old bridge construction
The first structure had a superstructure with two lanes for each lane, but without a hard shoulder. The length of the bridge was divided into two parts: an 832 m long foreland bridge and a 327 m long steel bridge over the river. A wide dividing pillar was placed between the two sections . The flood bridges consisted of a series of continuous girders that were separated by expansion joints and had span widths of 33.5 m. In the transverse direction they had a 22.5 m wide reinforced concrete slab beam cross-section with four webs. A three-span truss bridge with an overhead roadway with a maximum span of 140.7 m was present over the Elbe . A public sidewalk was arranged in the lower chord level of a superstructure. Access was via stairwells in the dividing pillars. On April 13, 1945, the German Wehrmacht blew up the bridge over the river.
A wooden temporary bridge was built in 1945. This was replaced in 1952 by a single-lane drivable superstructure for the Berlin-Hanover carriageway with a maximum span of 128 m. Between 1967 and 1969 the second superstructure section of the Hanover-Berlin carriageway was also restored. After the older superstructure had been repaired, the structure was finally accessible on two lanes in both directions in 1980.
New building
The new building, again a two-part construction, began in 1994. He replaced the old bridge with two separate, wider superstructures, which are arranged at a clear distance of 5.0 m. The minimum headroom on the Elbe was 6.5 m at the highest navigable water level. The structures are designed with a width of 19.25 m for three lanes and one hard shoulder. At 21.75 m, the northern superstructure of the river bridge is 2.5 m wider than the southern one, as it also has a footpath and bike path. Both the superstructures and the abutments of the old bridges were demolished. The building was completed in 1997, the construction costs amounted to about 107 million DM.
Foreland bridge
- Superstructures
The two adjacent superstructures of the prestressed concrete bridge have the continuous beam as a structural system in the longitudinal direction . In the transverse direction, they have a three-web T- beam cross-section with a constant construction height of 1.7 m. The longitudinal preload consists of internal tendons . The superstructure only has cross members in the end axes. The spans for the 25-span bridge are 28.2 m - 24 × 33.5 m. The distance between the support axes on the dividing pillar is 11.2 m.
- Foundation and substructures
The pillars and abutments are flat . The 24 pillar slabs of the southern superstructure date from 1935, new ones were built for the northern superstructure. The 6 m to 15 m high pillars have a full cross-section, are usually 1.6 m wide and 21 m long and clad with granite masonry. In addition to the old separating pillar with external dimensions of approximately 10 m × 20 m × 15 m, a new one was also built, and the abutments were completely rebuilt. A dike passage is integrated into the western abutment .
- Construction work
The old massive superstructure of the approach bridge was blown up and disposed of. The new T-beams were built with a feed scaffold with a cycle length of 33.5 m and a weekly cycle.
Power bridge
- Superstructures
The main girders of the two superstructures of the composite steel bridge consist of steel troughs with webs 10.5 m apart (or 11.7 m for the northern superstructure) below the deck. The box webs have a constant incline, which means that the base plate width varies between 6.0 m (or 7.2 m) and 8.21 m (or 9.42 m) due to the variable girder height. The webs are connected to the reinforced concrete deck using headed bolt dowels . A reinforced concrete floor slab is also arranged below in the area of the pillars. The carriageway slab is 19.25 m (or 21.75 m) wide, prestressed in the transverse direction and, with a variable cross-section height above the main girder webs, a maximum of 48 cm (or 52 cm) thick. The superstructures are haunched in the longitudinal direction . The construction height above the two river pillars is a maximum of 7.11 m, in the middle of the river 4.6 m and at the bridge ends 4.0 m. The spans of the three-span superstructures are 93 m - 140.71 m - 93 m. The anchor point of the superstructures is the eastern pillar of the river.
- Foundation and substructures
The river piers are on glacial till in sheet piling boxes shallow foundation . They were rebuilt for both lanes. The foundations were made with underwater concrete .
- Construction work
The steel superstructure of the river bridge was dismantled with truck cranes , in the area of the Elbe with the help of pontoons . The new steel superstructure was delivered by ship in five individual parts to the two foreshore areas. Cranes have lifted the individual components and placed them on auxiliary supports. Then these were welded together. The 120 m long and 840 t heavy middle section was welded together on assembly supports next to the bridge, floated in with a pontoon and lifted in with strand jacks. The reinforced concrete deck was built in sections with a formwork carriage .
literature
- DEGES: Bridge structures in the new federal states . Ernst & Sohn, Berlin (Germany), 2004. ISBN 3-433-01700-X
- Roland May : Pontifex maximus. The architect Paul Bonatz and the bridges. Monsenstein and Vannerdat , Münster iW 2011, ISBN 978-3-86991-176-2 , pp. 284-289, 532f., 615-617.
Web links
Individual evidence
- ^ Karl Schaechterle, Fritz Leonhardt: The design of the bridges . Volk und Reich Verlag, Berlin 1937, p. 93
| upstream | Bridges over the Elbe | downstream |
| Herrenkrugsteg | Hohenwarthe Elbe Bridge |
Magdeburg Canal Bridge |