Old-aged reinforced concrete sleepers
Requirements for used reinforced concrete sleepers
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Index |
Eligibility group requirements |
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Group I |
Group II |
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Type of intermediate rail fasteners |
Clip-bolt fastening (CB) |
All types |
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The tonnage passed on the sleeper and the period of its service from the moment of the first packing. |
No limits |
No limits |
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Cross cracks in concrete |
Not allowed |
The greatest opening of cracks up to 1 mm without destruction of concrete. |
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Longitudinal cracks in concrete |
Not allowed |
The greatest opening of cracks up to 3 mm without destruction of concrete. |
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Concrete chipping: |
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at the edges of the railways |
No more than 30 mm in length and no more than 10 mm deep. |
It is allowed to be no more than 100 mm long and not more than 30 mm deep. |
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on other edges of sleepers |
No more than 100 mm long and not more than 30 mm deep without exposing the reinforcement. |
No more than 300 mm long and not more than 60 mm deep. |
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working creases in holes for embedded bolts |
Not allowed |
Allowed |
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Non-straightness of the sub-rail |
No more than 1 mm |
Not more than 5 mm |
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Thickness of the washer at the point of contact with the head of the insert bolt. |
Not less than 4 mm |
Not less than 2 mm |