Rehabilitation of dilapidated bridges / arch constructions
Because of the strong increase of the heavy traffic in the last decades a change in use occured for these bridges and meanwhile these constructions have reached their maximum capacity. For this reason it is absolutely necessary to rehabilitate older bridge constructions. With the reconstruction, actual working load types are considered – with many existing constructions it is the question if their bearing capacity can be enhanced.
Bridge constructions, which serve as underpass or culvert of the appropriate section of road, rank among others to these objects. The rate of wear and / or the load capacitance of the existing bridge construction with regard to the prospective requirements gives information about, if the construction must be rehabilitated. With such projects the now since more than 100 years well-known corrugated steel construction method has been proven.
The rehabilitation of civil engineering constructions with corrugated steel succeeds within the following steps:
The prefabricated corrugated, curved and corrosion protected steel sheets are assembled ring by ring in front of the existing building and pulled successively into the building by a cable pull. After the completion of this procedure and right position of the corrugated steel building inside the existing building follows the gradual filling of the space between new and old building with a commercial available concrete material over the building ends or through the factory-made injection sleeves. To fill the space between the new and old building e.g. a walling including ventilation and control openings is needed. At the same time extending the old building the outside standing are as of the new building (e.g. cut ends) are backfilled layer by layer with soil. After a short drying time of the filling material the load capacity is given according to the traffic load of the requirements.
- The rehabilitation of bridges with the corrugated steel construction method is characterized by following features:
- low planning costs – no expensive calculations and drawing
- low effort during the implementation – no demolition of the existing building, no impairment of the road and railway traffic and avoidance of traffic diversion
- low construction time
- very low cross-section loss due to wide range of different profile shapes and dimensions
- long service life through high-quality corrosion protection
- low long-term maintenance costs
- building extension possible at the same time
- elimination of costly repairs or new construction of front and wing walls with factory-made pieces of embankment