Naini River Bridge Strenghtening

EasyChair Preprint 10886

Abstract

The Naini stay cable bridge over Yamuna river is located in the city of Allahabad in Uttar Pradesh, India. The bridge was built in early 2000 and it is one of the two only way to cross the river across the town. The approach spans and the side spans of the stayed cable part are connected by an half-joint equipped with bearings. Almost immediately after completion of bridge construction, some cracks appeared in the vicinity of the half-joint. A thorough investigation ordered by National Highway Authority of India lead to the conclusion that the design loads of the bearings and the half-joint has been under-estimated. Eventually, after several years of study to assess the extend of the issue and define possible corrective action, a solution to strengthen the half-joint and to replace the bearing was defined by the designer COWI and Freyssinet was awarded to the procurement and execution of the work with two phases: • The reinforcement of the structure by installation of two 40-ton beams clamped with PT bars on each bridge girder • The replacement of the bearings at the joint and at the top of the nearby pile.

The main challenge of this project was to be able to deliver the 40T strengthening steel beams from underneath the bridge deck to minimize the load on the half-joint during temporary phase of strengthening work. During this project, Freyssinet developed an innovative floating platform carrying the steel beams to launch them directly from the bank of the river. The floating platform was then tugged on the river right below the bridge deck to allow the lifting the beams in their final position.

Keyphrases: Access Platform, Method., Post-tensioning, Strenghtening, bearings

@booklet{EasyChair:10886,
  author    = {Jean-Roch Lucas},
  title     = {Naini River Bridge Strenghtening},
  howpublished = {EasyChair Preprint 10886},
  year      = {EasyChair, 2023}}