Old-aged reinforced concrete sleepers

Requirements for used reinforced concrete sleepers

 

Index

Eligibility group requirements

Group I

Group II

Type of intermediate rail fasteners

Clip-bolt fastening (CB)

All types

The tonnage passed on the sleeper and the period of its service from the moment of the first packing.

No limits

No limits

Cross cracks in concrete

Not allowed

The greatest opening of cracks up to 1 mm without destruction of concrete.

Longitudinal cracks in concrete

Not allowed

The greatest opening of cracks up to 3 mm without destruction of concrete.

Concrete chipping:

 

 

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.

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.

working creases in holes for embedded bolts

Not allowed

Allowed

Non-straightness of the sub-rail

No more than 1 mm

Not more than 5 mm

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