Padma Multipurpose Bridge Project

Total number of piles for similarpile capacity (97 MN) and pierlength (103 m)Impact on the foundationdesignAccommodation of servicesOverall length (including lengthof the bridge and viaducts)Main bridge, mNorthern abutment (m):Rail viaduct – northern endNorthbound road waySouthbound road waySouthern Abutment (m):Rail viaduct – southern endNorthbound road waySouthbound road wayConcrete Extradosed Bridge Steel Truss Bridgelarge diameter reinforced concrete bored piles, with steelsleeve above River bed level572 336Significant Impact.The increased dead weight loading because of morenumber of piles has a significant impact on thefoundation designProvided under the deckThe 30 inch diameter gas main can be supported underthe cantilevered section of the deck (similar to Jamuna).With the extradosed cables, the high voltage electricalcables cannot be supported on overhead masts and willbe required to be supported on extensions of the deckcantilever on the opposite side to the gas main.Higher, total 16,613 m. 828 m excess to other option.The length of transition structure (approach viaducts) iscontrolled by road vertical alignment (4%) necessary toachieve the desired vertical navigational clearances andthe maximum permissible rail grade (0.5%).6,1503,5837658873,693785750The piles will either be hollow steel tubes driven into the River bedor bored cast in situ concrete pilesLess ImpactLight superstructure due to less number of piles.Provided in the lower deck.The 30 inch diameter gas main can be supported on the lowerlevel of the truss adjacent to the rail line. Access for maintenanceis easily provided.The high voltage electrical cables can be supported either onoverhead masts or within the truss at the lower level on the otherside to the gas main.Less, total 15,785m.6,1502,7899551,0772,899975940Railway performanceTotal, m16,61315, 785The vertical deflection is estimated at 306mm under For traffic loading the deflection at midspan is 88mm, for railway6-13