Title : REHABILITATION OF EXISTING CULVERT BENEATH RUNWAY AT HYDERABAD AIRPORT
Authors : V. Rajendran and K. Balasubramanian
Publication : 13th – 16th February 2013
Volume :
Pages : 8-Jan
Price : 250
Abstract : The Airport Authority of India, Hyderabad, desired to strengthen the culvert beneath the runway at chainage 2335, which is running north to south across the airport boundary. This was necessitated as the culvert was at the touch down zone of the runway and was not capable of taking load from a heavier B-747-400 aircraft. The culvert is carrying sullage/waste water of the city. The central portion of the culvert for a span of 60m was required to be strengthened. The culvert has 3 vent and walls of the culvert are made up of stone masonry and the slab is of RCC. The following methodology was proposed by the consultants IIT Madras: (1) The existing culvert slab and walls were not taken in the design aspects and a new portal frame was designed; (2) Side walls with normal concrete and soffit of the slab with micro concrete were designed (3) The challenge was to ensure perfect contact between the existing slab and the new slab, as even a small gap would prove to be disastrous due to the point load of such a huge aircraft and mock up trials were conducted at IIT Madras to address the above issue. This paper describes in details the rehabilitation methodology adopted to strengthen the culvert beneath the runway as well as the mock up trials conducted at IIT Madras to ensure the proper bond between the old and new concrete. The paper also gives the details of the various challenges involved during the successful execution of the rehabilitation methodology.