News
R3 Horna Štubňa—Bypass, new railway bridge SO201–00
08/12/2009
Skanska recently engaged ABM to fast-track installation works and obtain cost savings for a new railway bridge carrying a single-track railway from Štubňa to Prievidza over the new R3 expressway. The original proposal was based on an in-situ concrete abutment with a temporary steel bridge deck being used with a permanent deck of steel beams cast with a concrete infill. This involved long-term restrictions on traffic on the track and two full possessions.
ABM Mosty in conjunction with Skanska devised a proposal to implement a buried Opti-Cadre structure with a span of 13.5 m resulting in an installation period of just 10 days. The structure is 33m long and the roof units are up to 46 T max. The skew of the bridge also demanded bespoke prefabricated wing walls up to 8.8 m tall and the sloped edges incorporate a coping unit to enhance the appearance. The efficiency of the design resulted in a deck thickness of 800mm and a wall thickness of 500m. This was a result of the efficiencies obtained by using soil-structure interaction in the calculations. The aesthetics of the bridge are also emphasized using purpose built precast edge beams that also support railings at the edges.
Skanska also obtained considerable programme advantages and reduced the demand for possessions with this new technology. In the entire construction period of 43 days the following works were completed:
• dismantling the rail, sleepers and ballast
• excavating a cut in the existing embankment
• driving 420 precast piles
• pouring concrete screeds
• installation of the ABM structure
• waterproofing, joint sealing & backfilling
• re-building the rail track and ballast
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