Construction of a road viaduct over railway line along Gminna-Cisowa streets in Tomaszów Mazowiecki
Our story connected with this viaduct reaches back to the year 1994, when we prepared a design for the renovation of an old, post-war (WWII) structure – a wooden deck supported on steel beams. 14 years later a decision was made to widen the viaduct and increase its load capacity. In 2008 we made the first design with fully steel deck and girders. Unfortunately – due to lack of funding – unrealized
The year 2014 brought a change, money flowed in, but we needed to renew the construction permit that had been valid for 3 years. At that moment, we changed the superstructure from steel to concrete. We designed a 3-span rigid frame with middle supports as columns, inclined toward the middle. To avoid long works over the electric line, the middle span was designed of pre-tensioned concrete beams of KUJAN type. The frame spans are 8,5+17,0+8,5m long. The inclined columns and abutments are supported on one large foundation slab, strengthened with steel sheet piles on the circumference. The deck carries a bituminous road 6,5m wide and one pedestrian sidewalk 2.0m wide. On access to the viaduct from the south, there is a retaining wall keeping the stability of the slopes.
Interesting facts
The viaduct is designed with quite a big skew angle – 60 deg. – as the angle between railway and road axes. The skew angle made it a little hard to draw the proper geometry of inclined supports.
Moreover, calculations of the node connecting inclined support and deck of both precast and in-situ structure required more attention than usual.
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