AS 1085 12:2002 Railway track material Part 12: Insulated joint assemblies.
5 DEFINITIONS
For the purpose of this Standard, the definitions below apply.
5.1 Factory-assembled bonded insulated joint
A Ioint manufactured in controlled conditions using rail and joint materials (see Figure 1). The rail may be raight or curved to a nominated radius A factory-aseembled bonded insulated joint is intended to be welded in place in track and may be manufactured to provide a running surface smoother than can be expected from fidd-aembled insulated jdflts
5.2 Ferrules, insulating
Insulating tubes used to provide insulation of bolts or sivage faeners from the rails and jdflt bars
5.3 Fid-assembIed insulated joint
A kit induding two joint bars which may be encsulated in insulating material, insulation, insulating end po to separate the two rails to be joined, high-rength bolts or vage faeners other hardware such as ferrules washers bushes and glues information on asserrtly, and any other materials that may be neceary. A fidd-aembled insulated joint isintendedtobeaembledinexiingornewtrackwithorwithouttheuseofglue(see
Figure 1).
5.4 Joint bars
Bar-type eel plates rolled, machined or forged, used to join two sections of rail.
5.5 Cut number
A nunter that isnwked on both railsforming afactory-aseembled joint.
5.7 Rail end post
Inilating material used to separate the rail ends It is profiled to the cross.section or angled
cut of the relevant rail.
6 METHODOFSPECIFYING
Insulated joints shall be specified by grade, type and ze of rail, e.g., Grade Al, factorya mbled bonded insulated joint in accordance with AS 1085.12 for 50 kg rail.
NOTE: The purchaser should provide to the aipplier any additional information that is for joint selection (see Appendix B).
7 PERFORMANCE REQUIREMENTS
7.1 Electrical effectiveness
Electrical ilation shall be provided between—
(a) the rails;
(b) eachjoirit bar andthe rails;
(C) each bolt or ivage faener and the rails; and
(d) the joint cononents and the rail-to-sleeper faening syem when inaIled in track.
NOTE: The purchaser should supply the manufacturer with the required information and drawings induding details of the rail to sleeper faeners (see Appendix B).
Joints shall be deslgned to prevent the accumulation of water, du or any materials that could reduce the effectiveness of the electrical isolation when inalled in the track.
Factory-assembled bonded insulated joints shall be finished with smooth surfaces Fiddassembled joints shall be able to be finished with smooth surfaces
Where used, the length of insulating ferules shall be such that they extend to within 2 mm of the outer face of each joint bar of a fully ten9oned insulated joint.
7.2 Test performance
Grade A and Grade B insulated joints shall conform to the opriate limits for the teds given inTablel.
For factory-assembled jdnts the rail ends to be joined shall not deviate from the cut plane by more than 2 mm within the height or width of the rail and shall match each other within the tolerance of ±0.2 mm.
NOTE: The matching tolerance may be achieved by cutting the pairs to be joined from the same length of rail and usng propriate marking (eg., cut numbers) to ensure that the matching pairs are kept together.AS 1085 12 pdf download.