page_title: Komsomolsk-on-Amur road-rail bridge
section_title: Design
hierarchical_section_title: Komsomolsk-on-Amur road-rail bridge / Design
caption_attribution_description: Amur River Bridge
context_page_description: The bridge across the Amur River is a road-rail bridge across the Amur River near the city of Komsomolsk-on-Amur. The bridge has a single-rail track and two-lane highway that allows to completely divide automobiles and other traffic from trains. The bridge carries also a single-circuit 220 kV-powerline.
  Train service on the bridge began in 1975, while automobile traffic — in 1981. The bridge is a part of the railroad line Komsomolsk-on-Amur — Sovetskaya Gavan, and of the highway of regional significance R454 Khabarovsk — Komsomolsk-on-Amur.
context_section_description: A project for the future bridge was developed in 1970 by the Design Institute "Lengiprotransmost" (LGTM) at the request of the USSR Transport Construction Ministry. 
  The span structures of the bridge were designed for class S-14 loads, while the two-lane highway ― for class NC-80 and N-30 loads in compliance with current technical rules and building codes. The bridge's steelwork elements were designed for arctic service in the zone A.
  The construction works were carried out by the Komsomolsk work team MO-26 of the trust "Mostostroy-8". In fact, two spans of the single-rail track and two-lane highway are resting on the common ferro-concrete piers. The spans of the two-lane highway are fixed in the outboard supports (on the downstream side).
  The total length of the bridge, including approaches from abutment to abutment, was 1,435.32 metres. The height above the water edge was 24 metres. A catchment area was 1,730,000 km².
  During construction in the period 1970-1971, a method of Prof. Konstantin Silin (1913–1996) was used for the first time in domestic practice of bridge building for erecting piers on the foundations of ferro-concrete sheaths with a diameter of 3 metres that excluded the use of the caissons that had been traditionally used in the construction of large and road-rail bridges of the Trans-Siberian railway.
  For anchoring the ferro-concrete sheaths into the bedrock, the reactive turbo-drilling method was applied for the first time in the world practice of bridge building. For this, a reactive turbodrilling machine of RTB-600 series was used. It consisted of three turbodrills for providing rotation of a rock-cutting tool in the form of roller cones.
  After immersion to the design elevation, the sheaths were filled with concrete by the tremie method. Next, the sheaths were combined by a reinforced concrete slab with the use of sheet piling, on which a pier's body was set in.
  The foundations of intermediate supports were manufactured of ferro-concrete sheaths with a diameter of 3 metres to a unified design by "Lengiprotransmost" with the use of concrete of Class М400 (B30) on durability and of Class F300 — on frost resistance, filled with underwater hydraulic monolithic concrete of Class M200 (B15). Reinforcing cages of rebar with a strength grade up to A-I and A-II (St5sp and St3sp steel grades) in diameter of 10 to 20 mm were embedded into the sheaths voids. In total, 304 sheaths were immersed during construction.
  The intermediate supports were massive prefabricated monolithic structures. They were dressed with granite slabs from the edges of the foundations up to the high-water level area and equipped with pointed ends on the upstream side serving as cutwaters (starlings) equipped with a vertical cutting surface. The bridge's sandstone masonry piers were quarried from the Kiesovsky and Trikratninsky deposits.
caption: The Amur River Bridge
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