FIELD: civil engineering. SUBSTANCE: wooden insertion pieces are installed in lengthwise slots. The slots have openings on the side of sleeper ends and are made of several layers of different density. The layers have elastic lining 5 between them. Upper layer 3 of the insertion piece is made of compressed wood of 900-1100 kg/m3 density, and others are made of natural wood of 450-650 kg/m3 density. Insertion piece length is more than twice as large as length of metallic lining 5. EFFECT: high durability. 2 cl, 5 dwg
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