KMRC likely to install noise barriers in Salt Lake next week

USA Utah News

Kolkata: Components of noise barriers for the East-West Metro will soon reach Kolkata from Taiwan. The Kolkata Metro Rail Corporation (KMRC) is likely to start installing them on five stretches of Salt Lake from next week.
Like Delhi Metro, KMRC is putting up the barriers along the 5km elevated corridor in areas from where complaints of sound pollution was received. The areas are DL block, in front of Anandalok Hospital, near Rabindra Bharati University (RBU) campus at EE block, near ILS Hospital opposite East-West Metro’s Central Park depot and at the Duttabad-Salt Lake crossing near Bidyadhari School.
The noise barriers will stretch 20-30m along both sides of the viaduct or the superstructure on which the tracks have been laid.
Mumbai-based Metalmeccanica Fracasso India was contracted to provide the material acquired from Taiwan to build around 400sqm of sound barrier spread over the five areas.
“PIMMA sheets and micro-perforated sheets that were brought to Mumbai from Taiwan have been dispatched to Kolkata,” an official said. Sheets made of PIMMA or polymethyl methacrylate, commonly known as acrylic glass, are considered most economical. It can be easily fabricated for aesthetic applications. The noise barriers will be framed in galvanized steel frames. KMRC is working on the methodology of installation — the height of the sheets vary between 2.5m and 1.5m from the viaduct’s parapet.
The elevated Metro viaduct runs close to hospitals, homes and educational institutions on the above stretches of the VIP township. Last year, the noise recorded in these neighbourhoods when the East-West trains chugged around was 78-80 decibels.
KMRC decided to filter out the sound through absorptive barriers that mitigate the noise generated by trains by 20 decibels. The agency also checked with the other type — reflective noise barrier — but decided against it. “The reflected sound would be uncomfortable for the passengers and we don’t want that. After all, East-West Metro matches international standards,” said an engineer.

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