СНиП 2.05.07-91

СНиП на английском языке 2.05.07-91

SNiP in English

3.94. It should provide track laying of new wooden or new and used concrete ties for internal railways of industrial facilities, according to the table 19*.  Selection of tie type for cases, wherever accepted utilization both new and concrete ties, shall be done, considering the shipping distance and conditions, which are established in the Item 3.95* and 3.96.

3.95*. Concrete ties shall be laid on the tangents and curve sections with radius 350m and more, with circulation of the rolling stock with axial load not more than 265 kN (27 t-f) and without limitation of traffic flow. Used rail ties of I validity group, complying to the above-specified standards, are accepted to be utilized for all approach and internal railways. The II validity group ties can be utilized for all railways, excepted approach and adjacent railways I category and specialized railways for hot freight transportation.

Railway sections, which are assigned for filling in and off of tank-cars and located with the distance less than 25 km from stationary storage reservoirs, to store liquids of air separation or discharge-filling appliance for such products, shall be provided with concrete ties on gravel or crush stone bed.

It should be generally provided wooden ties, which passed bitumen treatment or were treated with other material resistible to hostile environment on the handling sites, wherever corrosive freights are served, and also arrangement of special spouts in the roadbed for corrosive liquid and polluted superficial water removal.

Track laying of concrete ties with different structures, or both concrete and wooden ties in the same rail length is prohibited. Replacement of two-six concrete ties with wooden ties in the screw joint areas is accepted.

The track laying on the approaches to level crossings, switches and iron bridges shall be provided with wooden ties instead concrete ties.

Transition from concrete ties to wooden shall be arranged by method of combined rail length, assembled from concrete and wooden ties. The transition point from one type of the ties to the other shall be located on the distance 6 –6.5 m from rail joints.

3.96. Concrete ties shall not be utilized:

for track laying on portable railways; in the regions with permafrost soils; on over-watered and heaving soils; on handling sites, which are assigned for mass bulk cargo services; on the slopes with angle more than 200/00; in the areas where railway are under impact effects with handling of cargo; on the areas with non-stabilized roadbed and with intensive obstruction; on the railways for slag and metal tipping; in the areas of metal flow and hot workshops; on tangent inlays with length 25m and less, between conjugated curves with radius less than 350 m, switches and girder-type rail crossing with balks.

3.97. Electrical insulation of rails from ties shall be provided with track laying of concrete ties for railways with electric traction and also for sections, equipped with track circuits.

3.98. Concrete switch ties shall be utilized for switches.

Concrete switch ties for switches with frogs, grades 1/5,1/6,1/7,1/9 and from rails R50 and R65 are accepted for track laying on all industrial facilities railways, excluding railways with circulation of rolling stock with axial loads 450 kN and more, and also portable railways and railways with destructed roadbed on heaving soil sections; in the areas of melt and flaming-slag flow; wherever is possible heavy objects falling directly on the railways; and also switches with prevailing traffic in one direction.

Concrete switch ties are necessary to be laid on high quality bed from crush stone and asbestos.

Switches with concrete switch ties on newly constructed railways shall be laid after soil consolidation up to value 0.98 of maximum density determined by method of standard consolidation.