BS EN 13481-4-2012 pdf download.Railway applications Track Performance requirements for fastening systems Part 4: Fastening systems for steel sleepers.
EN 13674.1, Railway applications — Track — Rail— Part 1: Vignole railway rails 46 kg/rn and above
EN 1 3674-4+A1, Railway applications — Track — Rail — Part 4: Vignole railway rails from 27 kg/rn to. but excluding 46 kg/rn
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13481-1:2012 apply.
4 Symbols
For the purposes of this document, the following symbols apply.
FHFAmaK static preload applied in measurement of high frequency stiffness of assembly, in kN;
FFA1 minimum force applied in measurement of dynamic low frequency stiffness of assembly. in kN;
FFk reference force for measurement of dynamic low frequency stiffness of assembly. in kN;
FLFp1 notional fastening clip force assumed for measurement of dynamic low frequency stiffness of pad, in kN;
Fjpm reference force for measurement of dynamic low frequency stiffness of pad, in kN;
axial toad at which gross slip occurs in the longitudinal ra restraint test (EN 13146-1:2012), in kN:
FSAI notional fastening clip force assumed for measurement of static stiffness of assembly, in kN;
force applied to assembly in measurement of static stiffness of assembly, in kN;
F5,1 notional fastening clip force assumed for measurement of static stiffness of pad, in kN;
force applied to pad in measurement of static stiffness of pad, in kN:
lç transfer stiffness in measurement of high frequency stiffness of assembly, in N/rn;
ICLFA low frequency dynamic stiffness of assembly, in MN/rn:
L lateral component of force transmitted by the wheel to the rail head as shown in Figure 1, in kN;
PL component of load parallel to the running surface of the rails, in kN;
On structures such as long bridges, the longitudinal force transmitted between the track and the structure may be calculated by the method in EN 1991 -2. The value of Fmix measured in accordance with EN 13146-1 may be used in the calculation. In such cases, and subject to agreement between the purchaser and manufacturer, the minimum requirement for longitudinal restraint may be reduced.
5.2 Torsional resistance
When required by the purchaser, the torsional resistance shall be measured by the procedure in EN 13146-2
and the result reported.
5.3 Pad and assembly stiffness
As required by EN 13146-4, the assembly static stiffness and assembly low frequency dynamic stiffness shall be measured in accordance with EN 131 46-9+A1. Measurement of the rail pad static stiffness is required at the purchaser’s discretion in accordance with EN 13146-8. If the purchaser requires any of the following it shall be measured in accordance with EN 13146-9+A1:
pad low frequency dynamic stiffness:
assembly high frequency dynamic stiffness.
Test loads are given in Table 2.
NOTE Guidance on the measurement of pad high frequency dynamic stiffness is given in EN 13146’9:2009+A1:2011, Annex A. For the measurement of assembly properties at acoustic frequency see EN 15461 +A1.
5.4 Effect of repeated loading
As required by EN 13146-4, this shall be determined by the procedure in EN 13146-4 with the following addition: that sleepers shall be tested in accordance with EN 13146-4:2012, 7.4 and Figure 5, but the steel sleeper, or pair of sleepers, shall be supported on elastomenc soft it pads as described in Annex A.
5.5 Electrical resistance
This shall be not less than 5 kfl when measured in accordance with EN 13146-5. One only of the three sleepers shall be tested before and after the repeated load test in 5.4. The user may specify a higher value for use with certain track circuits. Durtng the repeated load test sequence, the edges of the rail pad shall not be removed for the clamping force test. The clamping force test procedure for assemblies not incorporating a rail pad (EN 13146-7:2012. 7.3) shall be used with the pad in position.
NOTE This requirement relates to signalling currents only, not to traction currents. Guidance on traction currents is given in EN 50122-2.
5.6 Effect of exposure to severe environmental conditions
Following exposure to the salt spray test in accordance with EN 13146-6:2012, the fastening assembly shall be capable of being dismantled, without failure of any component and re-assembled using manual tools provided for this purpose.BS EN 13481-4-2012 pdf download.
BS EN 13481-4-2012 pdf download
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