ENB Liedbachtal Bridge, A 1 - Segment-by-Segment Construction
Short description
The existing Liedbachtal Bridge has only a limited operating permit and must be replaced. Once construction is complete, the new bridge will be moved into position using a transverse sliding method.
The project
The ENB Liedbachtal Bridge on the A1 was constructed as a prestressed concrete bridge with a double-walled box girder cross-section.
The structure consists of two superstructures, each approximately 330 m long.
Construction was carried out using the incremental launching method, in which the superstructures were built in sections approximately 30 m long and advanced to their final positions.
This construction method allowed the bridge to be built cost-effectively and with minimal disruption to the surrounding terrain.
Services in detail
Prestressing Technology, Bridge Construction:
- Internal strand tensioning method with subsequent bonding; external strand tensioning method, Type E
- Internal strand tensioning method L15 per Z-13.1.-114
- 670 metric tons of L15 prestressing steel
- 124 L15 tensioning anchors
- 124 L15 fixed anchors embedded in concrete
- 740 Fixed overlap coupling L22
- External tensioning method per Z-13.73-110123
- 300 metric tons of prestressing steel - 96 L15E prestressing anchors
- 96 L15E fixed anchors Approx. 700 deflection points
- Tensioning of the cantilever nose with tension members, L7, L9, and L12
- Tensioning in the box girder
Challenges
- Double-cavity truss, very wide, with a large number of tension members that must be installed within a tight timeframe.