CONTRACK PBPW
Expansion joint concrete slab (CONTRACK PBPW pol. Płyta Betonowa z Przyrządem Wyrównawczym), integrating a prefabricated concrete element with a track device, which eliminates track stresses resulting from thermal expansion of rail steel.
Integration of the concrete slab structure and the expansion joint is achieved through the use of a special (box) design of the latter.
CONTRACK PBPW dimensions depend on the expansion joint used, in particular the travel value of the essential elements (working range) and the design requirements.
Expansion joints are installed in the slab rail ducting using alignment pads which allow their alignment to the designed grade line.
Rail adjacent zone is made using polyurethane material for continuous, flexible rail fixing.
As a standard, the slabs are suitable for tracks with a typical rail spacing of 1,435 mm and 1,000 mm, while their minimum width is 2,200 mm.
Slabs combine the main load-bearing layer of the substructure of the ballast with the installation that is the wearing layer of the road surface of any texture (e.g. rough, smooth, imitating cobblestones, diamond pattern).