German Unity Transport Project 8

 Nuremberg – Erfurt – Halle/Leipzig – Berlin

Slab Track Austria (STA) system

The Slab Track Austria system is based on decoupled, elastically-supported track slabs. Two tapered apertures are cast into each track slab to prevent lifting and warping. Decoupled, elastic support is provided by a PU/rubber granulate layer adhesively bonded to the underside and to the inside of the cast tapered holes in the track slab. The prefabricated slabs are cast using steel formwork, to achieve the highest possible degree of precision. Sound dampers can easily be laid on the track slab to meet requirements for constructing slab track. The system can be used on embankments, bridges, mass-spring systems and in tunnels.

Facts and Figures

Length: 5,16 m (2,56 bis 5,16 m)
Width: 2,40 m (2,10 bis 2,40 m)
Thickness: 160 mm (160 / 240 mm)
Overall height: Rail type UIC 60
(Running surface of the rail - top edge of concrete):
For reinforced casting     >= 473 mm
For unreinforced casting  >= 433 mm
Openings: 0.91 x 0.64 m (top)
0.87 x 0.60 (bottom)
Weight: 50.00 KN (gross)
51.40 KN (with Vossloh 300-1)
Types: Straight (R>3697 m)
Curved (R=200 to 3697 m)
Thickness of cast concrete: Reinforce          >= 80 mm
Not reinforced    >= 40 mm
Rail supports: je GTP 8 Paare Schienenstütz-
punkte, Abstand 650 mm
Aufbau - Gleistragplatte System ÖBB/PORR
Aufbau - Gleistragplatte System ÖBB/PORR (Grafik: PORR AG)

Advantages of the system:

  •  Low-maintenance system suitable for heavy loads, freight traffic and passenger traffic on high-capacity and high-speed lines
  •  Structurally-borne noise reduced by the elastomeric layer. Stress cracks caused by creep, shrinkage or temperature fluctuations  are also prevented
  • Maximum precision in track slab production
  • Consistently high quality is ensured and logged by a sophisticated quality assurance system
  • A high degree of prefabrication makes fast laying possible
  • The high early strength of the self-compacting cast concrete, applied without vibration, facilitates a high pour rate
  • Possibility of unrestricted adjustment of settlement if required
  • Replacement of track slabs possible in a few hours
  • The low overall height and width are also suitable for smaller tunnel cross-sections
  • The track slabs can be fitted with suitable plugs, making subsequent mounting of track fittings on the smooth, flat surface of the prefabricated concrete possible without drilling

Substructures:

1. Tunnel inverts
Tunnel inverts are usually low-settlement or settlement-free and thus form an ideal substructure for slab track. The system can be laid directly on the invert. Semi-shells are inserted diagonally in the cast concrete every 50 metres, or every 25 metres in the vicinity of the portals, to drain surface water. The remaining clearance from the screed is usually filled with ballast or mass concrete.

2. Bridges
Bridge support structures can also be used as an immediate substructure for slab track, analogous to tunnel inverts. Horizontal forces, for example, are reliably dissipated into the bridge structure through thrust. 

3. Embankments
Slab track is laid on embankments using a load distribution or hydraulically-bonded layer. The effects of weather are very small, due to the high level of prefabrication of the slabs and the relatively small cast openings. This also applies, of course, to laying on bridges.
Cross-sections for Section VDE 8. 1 (Drawings: DB AG)

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The project VDE 8 is supported by :