In a bid to speed up the much-delayed Phase-IV project, Delhi Metro Rail Corporation (DMRC) is going to use a technology that has been used on a few occasions previously. Prior to this, DMRC has used different types of precast structures such as box girders, I-girders and U-girders, to construct its corridors, but for the Phase-IV project, DMRC has decided to standardize the usage of U-girders for the entire 104-km network on the six proposed corridors to save time and construction cost. The U-girders will also have inbuilt sound barriers, apart from built-in cable support. When compared to other types of girders, the much longer U-girders drastically reduce construction time, but due to their length, require absolute precision during construction. Also, their length makes transporting from casting yard to the site a tricky task. While the conventional box girders and I-girders are 2.2m to 2.5m long, the length of U-girders varies between 22 and 27 meters. The longer length means a span between two pillars can be constructed overnight compared to 5-6 days in case of conventional girders. DMRC has used these girders in the Airport Express Line, the Badarpur to Faridabad section of Violet Line, and in a section in Noida, said an official spokesperson, who added that standardization will reduce time and costs in redesigning, re-checking and employing different construction schemes. It will also help in ensuring that no human error creeps in while preparing a new set of drawings by various consultants.
📅Published on:
30 August 2019
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