Hyderabad, November 04: The South Central Railway (SCR) has taken up the construction of a large four-lane road under bridge (RUB) between Fatehnagar and Nature Cure Hospital stations in the city using the modern ‘Box Pushing Technique’, enabling the work to progress without stopping the trains.
Once completed, the RUB would provide a direct connectivity between Begumpet and Balanagar area for the convenience of road users.
The work for the railway portion of the bridge is expected to be completed by February 2011 at a cost of about Rs 13.50 crore.
The bridge consists of two vents to accommodate two lane roads each with footpath.
The length of the vent is 29 meters with a width of 2.80 meters and a height of 6.69 meters.
Each vent will comprise three pre-cast RCC box segments using ready-mixed concrete.
These pre-cast segments are pushed across the railway line with the help of specially designed thrust bed and jacking equipments.
The jacks are operated hydraulically and controlled through centralized power pack and control panel.
The earth is excavated through an excavator and lifted from the bottom of the box to ground level with the help of specially made lifting cranes as there is a level difference of six meters between the box and the adjacent ground level. Care has been taken to remove the excavated earth and rock by means of tippers in the night to a dumping place outside the city limits.
The rock is removed by using mechanical means of chiseling/ rock splitter.
The total concrete being used is 2,100 cubic meters and the reinforced steel is 300 metric tonnes (MT). The weight of the six segments together will be 5,250 MTs with each segment weighing on an average 875 MTs.
The SCR Engineering Department have taken required safety precautions in the execution of the work so that no unsafe conditions prevail while pushing the box under running trains.
–Agencies