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 1960–1970, Lengiprotrans developed a project for the BAM Chara — Tynda section with a length 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 site, the institute designed 798 artificial structures, including a railway overpass along the Khani River.
When designing the BAM at the pressure section in the narrow Khani gorge, several options were considered: installation of a subgrade with retaining walls, construction of an overpass on the slope along 2 tracks, laying a railway track with 2 bridge crossings across the river. As a result of a comparative analysis, the flyover option was adopted.
The flyover in plan is located on a curve with a radius of 800 m, slopes of 9 and 16.5% in the profile. It is designed according to the scheme 14x34.2 m with metal spans with ballast ride. Intermediate supports up to 12 m high and the abutments are of massive construction from blocks of mass use. This was due to the possibility of passing stone debris under the bridge.
