Lefortovo tunnel began to rebuild the fire-resistant coating

© RIA Novosti / Vladimir Escapability tunnel. Archival photoLefortovo tunnel began to rebuild the fire-resistant coating© RIA Novosti / Vladimir Astapkovich

Work on the restoration of fire-retardant coating in Lefortovo tunnel began in Moscow, have informed in a press-service of the municipal services complex on Thursday.

«The staff of the GBU «Gormost» began work on the restoration of the fire-retardant coating in the Lefortovo tunnel, which will be held in three stages throughout the construction of 3 kilometers», — is spoken in the message.

It is noted that the first stage will prepare the surface of the tunnel – hold blasting. In the second stage are restored concrete surface of the tunnel with shotcrete installation.

«This is a special machine designed for spraying concrete mixtures and heat-resistant concrete by: deliver moisturizing composition occurs only at the time of his application,» — said the press service.

The main advantage of this technology, as noted in a press-service, is a high material feed rate from the sprinkler, up to 30 meters per second, which provides excellent compaction and therefore high strength sprayed concrete.

«The same fire resistant material is applied to the third and last stage of the work. It also uses a special gun-mounting», — concluded in the complex.