The Baikal-Amur Mainline (BAM) is the largest railway passing through the territory of Eastern Siberia and the Far East in the direction of Taishet — Sovetskaya Gavan.
In 1967 Lengiprotrans was commissioned to design the BAM Chara — Tynda section of about 670 km. The route was laid in the region of the Olekma-Vitim mountainous country through rugged ridges dissected by river valleys. On the Chara — Tynda line, the institute has developed designs for 798 artificial structures, including 25 large railway bridges and 1 overpass.
A large railway bridge across the Imangrakan River was erected at 1359 km of the BAM. The structure is designed according to the 5x34.2 scheme with a length of 181.6 m. Spans are metal with a ride on top on cross-sections. The abutments have a prefabricated monolithic structure, developed by Lengiprotrans in 1980 for mass use at bridge crossings of the Chara — Tynda section. At the base of the supports, drill posts with a diameter of 0.8 m and bored pillars with a diameter of 1.0 m were used.
Photo: Boris Kavashkin / ITAR-TASS, Baikal-Amur Mainline, station "Pervaya" near the village of Severomuisk, 1999.
