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JEC Europe 2012 - A pedestrian crossing of an unusual shape has been built by order of the Khimki administration (Moscow region, Russia).
This pedestrian overpass consists of four 33-metre-long spans integrated into a single unit at a centre support with 4 vertical towers at each extremity containing a pedestrian staircase.
An open and airy look of the structure is achieved due to a decorative spiral lattice made from composite material which embraces the spans and towers.
The structure of the lattice is made of a set of thin-walled hollow curved tubes connected by cross-shaped elements at their points of intersection. A spatial structure is connected to the load-bearing elements of spans pointwise, whereas the structure around the towers is supported by an understructure.
The standard structural element is a thin-walled curved tube 2800 mm long with a 200-mm diameter and wall thickness from 3 to 5 mm. The connecting elements, either dismountable (consisting of two halves) or one-piece, form a spatial cross-shaped structure. The tubes are assembled into the spatial structure by way of bonding as well as with mechanical elements.
The structure uses 1,777 composite elements, including 1,168 tubes, 316 cross-shaped dismountable joining elements, and 293 non-dismountable elements. The total weight of the composite elements is 13,689 kg. The weight of a similar metal structure would be 38,447 kg.
The material used to produce the elements of the decorative grid is glass-fibre reinforced plastic based on multiaxial quasi-isotropic fibres and polyester resin. The production technology is vacuum infusion and pressure moulding through an airtight bag.