Erection Of Superstructure In Metro Viaduct

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ERECTION OF SUPERSTRUCTURE

●      Erection is done during night because road traffic is less and space required is available.
●      Care should be taken that work is done at least 6 m away from of electric wires and poles.
●      There should not be any traffic or anything prone to damage within swing area.
●      Cranes are used to lift and place the structure. One crane is used for erecting pier cap and two cranes for erecting U Girder
●      Location of crane is decided upon following factors :
○      Size and weight of superstructure.
○      Area available free from utilities.
○      Boom length and boom angle as decided by engineer.
○      Swing Area.
○      Location of trailer truck.
●      Crane rests with its arms.
●      Steel plates are kept below the arms so that load is transferred uniformly to ground over larger area.
●      Counter Weight is decided upon following factors :
○      Weight of crane, boom, hook, chains, structure to be loaded.
○      Ground reactions at all fours crane arms is calculated.
○      Moment of all the forces is balanced about a point.
●      Boom length and boom angle is decided upon load chart of the crane which is provided by crane manufacturers.
●      Before the erection once trial swinging is done without load, to check the alignment and positioning.
●      Structure is then lifted and placed.
○      Pier cap on pier.
○      Girder on pier cap.
●      Surveyors play a important role in positioning the structure accurately as desired.
●      For pier cap temporary steel support is given and stitching is done by pouring concrete in the hollow region left.
Girders are rested on neoprene rubber pads bolted with steel plates with structural glue applied on both surfaces for shear load transferring.
Location: Mumbai, Maharashtra, India

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