Highlighs & Facts of Strukturas Form Travellers:

• Max. Segments length: 5,0 m
• Max. width superstructure = 11,78 m
• Length of hammerhead: 13,0 m
• Min. hor. radius: STRAIGHT
• Max. longitudinal slope: 0,7 %
• Section cross fall: 2,5 %
• Weight of heaviest segment: 154 TONS
• Highest Segment height: 4,92 m
• Lowest Segment height: 2,5 m
• Min. Distance to neighbor bridge: 2,07 m
• The maximum allowable deflection of the Main Girder due to concrete load is approx.: L/400
• The maximum allowable deflection for other structural members: L/250

STRUKTURAS
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Video Credits to Fabe Polska Sp. z o.o..

The OHMSS was used for concreting the central deck box and the WFT used to install the pre­ cast struts and concrete the wings.

The broad range of technical requirements used during the design phase of the OHMSS included the following features: 

• the outer formwork of the OHMSS must be possible to open when free distance to the ground is only 3.0m;
• the outer formwork must be able to pass in the closed position over the existing railway without reaching a height of more than 0.7 m;
• the rebar U-cages (bottom slab and webs) of the deck must allow for assembly in 12 m sections and in the final position using the transport devices that equip the OHMSS;
• the sections of the rebar U-cages of the deck must allow for lifting from ground level or as an alternative be transported over the deck that has already been built and later moved through the inside of the OHMSS main structure through its rear support;
• the deck shall be concreted in two phases, the first phase involving the concreting of the central box using the OHMSS, the second phase involving the installation of the pre-fabricated struts of the deck wings and the concreting of the wings itself using the WFT;
• allow for the OHMSS to move backward to the abutment and proceed with a side-shift to the alignment of the second deck parallel to the first one;
• allow for the passing of the OHMSS through the WFT, after dismantling the OHMSS external formwork and without needing to dismantle the WFT (only its 4 legs are dismantled);
• allow for the forward movement of the OHMSS passing over the deck of the central bridge to the opposite shore of the Vistula River.

What is special about Strukturas MSS technical solution?

• MSS construction method ensures minimal interference with nature, traffic and private property.
• MSS Mezio will be utilised for NERIS bridge, it what was produced 2005 for viaduct MEZIO, Portugal and running on sharing economy base over 20 years in multiple bridges in Europe. This shows Strukturas sustainable approach for designing and utilising machines with long lifespan creating minimal CO2 emission footprint.
• MSS will be used with tower crane on top. Tower crane will be launched with MSS.
• Fresh concrete loads will be transferred not to the pier, but to the pier foundation.
• Tailored Hydraulic Internal formwork will be used to boost construction productivity.
• Typical cycle is expected 2 week/span.

MSS Neris Key facts:

• Max span: 45,0m 
• Max. MSS span: 36,35m
• Weight of superstructure: 28,8t/m 
• Width of superstructure: 13,9m
• Min hor. radius: R = 3965m
• Max long. Slope: 0,25%
• Bridge length: 1510,0m 

What is special about Strukturas solution?

• Tailored for Concreting the massive and geometrically narrow complex hammerhead to extend additional long and heavy segments using the balanced cantilever method.
• Prepared for the installation by incremental launching of a steel deck that will seamlessly overlay the partially concreted hammerhead.
• Allows continued concreting the hammerhead under the steel deck, integrating it with the deck while maintaining full support and precision.
• This innovative solution minimise crane and labour needs through hydraulic adjustments, while keeping the Special Form Traveller in place to ensure precise geometry and alignment.