Wednesday, April 10, 2019

Iconic Signature Bridge In Delhi

The bridge was inaugurated on 4th November 2018. Signature Bridge is an elaborated cantilever span cable- stayed bridge, comprising of an asymmetrical inclined namaste-shaped Steel Pylon of 154 m height.

                         Total length of cable stayed bridge from expansion joint to expansion joint is 575 meters, with main cable- stayed span of 251 meters supported with 15 sets of cables on one side and counterbalanced by 8 back stay cables attached at a rocker bearing on axis 23. 
The bridge's steel and concrete composite deck has dual carriageway of 4 lanes, 14 m each, with about 1.2 m central verge, space for anchoring cables, maintenance walkway and crash barrier on either side of the central verge. The outer to outer width of bridge is around 35.20 m and the approach span are about 36 m long. Spherical bearings are provided on all the piers. Pendulum bearing are provided for back stay.
                          The Steel Pylon of around 154 meters from top of the bearings consists of two legs made up of steel boxes, which merge into one upper pylon body zone made up of a load bearing skin stiffened by internal stiffeners and bracing s, where the cable supporting the main span and the back stays are anchored. Each of the pylon legs consists of a hollow steel box, which would be roughly 50 - 80 meter high. The upper end is the kink diaphragm, which is the transition from pylon leg to the pylon body.
                            It also has a pylon head, made up of beams and columns in steel structure with a glass cladding. Major part of the steel for pylon is of grade S355. In very highly stressed anchorage zones, S460 grade steel is also used. Each leg of pylon rests on spherical bearings to transmit vertical loads of around 17,000 T.
                             The deck spans 32 m in transverse direction for B lanes of traffic,4 lanes in each direction. The composite deck consists of two main girders (I- shaped) in longitudinal direction and cross girders at 4.5 m spacing along the deck. Spans are of 13.5 m long on the cable- supported part, 36 m on the approach  spans, which are supported over concrete columns. Most part of the deck slab is made up of full depth prefabricated concrete elements of varying thickness from 250 to 350 mm, stitched in- situ over steel girder flanges. In highly stressed areas, near pylon base and backstay anchorage, in-situ concrete up to 700 mm thick is used.
                                The cables are made up of bundles of parallel 15.7 mm strands of class 1.770 MPa, protected against corrosion with hot dip galvanization & outer PE- pipes. Depending on the location the number of strands per cable varies from 55 to 123 nos. at the main span and is 127 nos. for each backstay.
                                 Under the axis A and C, independent foundations are provided up to the depth of 20 m below ground level as generally rocky stratum was geotechnically determined at that level.
                              There are 6 numbers of open foundation resting on rocky strata at a depth of about 20m. 
                              As the open foundation were to be rested on rock by about 20 m below the ground level, sheet - piled cofferdam was used for excavation by Elevated Lateral Support System (ELS).
                           All well foundation were required to be done adopting jack down method of sinking for controlling the sinking operation without tilt and shift. 


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