Butovskaya metro line to have recycled plastic sleepers

June 6

Butovskaya Moscow metro line will soon have composite (composite is a multicomponent extra durable material) sleepers instead of traditional wooden ones.  They are made of recycled plastic. Repair work is underway on the open section of Butovskaya Line between Ulitsa Skobelevskaya and Ulitsa Gorchakova stations. Metro workers have laid more than 600 new composite sleepers.

Recycled plastic sleepers serve five times longer than wooden ones, for more than 50 years. Besides, they are more resistant to various damages: they do not rot, they are mould- and water-resistant (unlike wood). In addition, composite sleepers do not conduct electricity. This is important for safety reasons, as electricity is transmitted along the third rail to drive the train.

New sleepers are more endurable than wooden ones. And they are almost three times lighter than reinforced concrete ones, which makes them easier to install. Moreover, composite sleepers reduce noise and vibration when the train is moving. This in turn helps to protect the railway tracks from the negative impact of vibration and reduce the scope of repair work.

"Most of Butovskaya Line runs on the surface. So, its tracks require greater care, as they are affected by precipitation and temperature variations. Sleepers made under the new technology will improve movement safety and reliability of this branch's infrastructure. In total, more than 11,000 composite sleepers are to be laid here until 2021 to replace wooden sleepers along the entire length of Butovskaya Line," said Deputy Moscow Mayor, Head of the Department of Transport and Road Infrastructure Development Maxim Liksutov.

The repairs are carried out at night, so that the work does not interfere with passengers. At this time, metro is closed and there are no trains running.

Recycled plastic sleepers were first tested in Moscow metro in 2016. The experiment was successful, as the sleepers proved to be wear-resistant and durable. Workers started to lay them on different lines of Moscow Metro. This February, the section of Sokolnicheskaya Line from Krasnoselskaya to Bulvara Rokossovskogo station had its composite sleepers laid.

Moreover, recycled plastic sleepers were laid on tram tracks in Moscow in 2018. First, they were tested on Prospekt Mira tram line section. Last year, these sleepers were laid on nine track sections, in Bolshaya Kalitnikovskaya Street, 1st and 4th Roshchinsky driveways, Donbassky overpass. The total length of tracks with plastic sleepers is 10 km.

Production of  recycled plastic sleepers is an environmentally friendly technology that reduces the use of wood and saves trees. It is used in Europe and Asia, the US and Canada. Wooden sleepers are also impregnated with environmentally harmful coal tar preservative. But even with impregnation they serve only 10 years. The new technology allows re-using the plastic. Its recycling helps to solve the problem of solid waste disposal.

This and next years, such sleepers are expected to be laid on 22 tram track sections.

Source: mos.ru

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