System for construction of composite u shaped reinforced girders bridge deck and methods thereof

A precast method of construction of composite U shaped reinforced concrete and steel girders bridge deck, comprising the steps of:

• assembling steel main girders and cross girder fabricated with shear connectors at site for spans more than 15 m;
• casting upside down said main girders with said slab, wherein the grade of concrete is equal or higher than deck concrete so that the stresses are in permissible limits;
• precasting a web if handling capacity is available;
• precasting two or more cross girders with top slab to get moment of inertia enhanced thereby to carry dead loads and live loads;
• placing said main girders with slab in a position over supports where cross girders with deck are to be connected to the web of main girder and casting of web portion in situ.

An in situ method of construction of composite U shaped reinforced concrete and steel girders bridge deck, comprising the steps of:

• assembling steel main girders and cross girders fabricated with shear connectors at site for spans more than 15 m;
• placing main girders in a position where said cross girders are to be connected;
• performing concreting in slab over top flange of main girder and web portion;
• spreading 6 mm MS deck sheet over top of said cross girders and being welded with 3 mm fillet welds;
• performing concreting in the deck portion to ensure better transfer of forces and control of deflection after 14 days of concreting over top flange and web portion of main girders slab.