TB/T 1495-2020 Type I fastening system
1 Scope
This standard specifies the composition, assembly performance, technical requirements for parts and components, inspection methods, inspection rules, marking and packaging, storage and transportation of Type I fastening system.
This standard is applicable to Type I fastening system for 50 kg/m rails on concrete sleepers of ballasted tracks on mixed passenger and freight railways with straight and curve radius not less than 295 m and those for various railway station tracks.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2 Fasteners - Ends of parts with external thread
GB/T 41 Hexagon nuts, style I - Product grade C
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197-2018 General purpose metric screw threads - Tolerances
GB/T 224 Determination of the depth of decarburization of steels
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method
GB/T 443 Lubricating oils for total loss systems L-AN
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB/T 531.1 Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)
GB/T 700 Carbon structural steels
GB/T 1040.1 Plastics - Determination of tensile properties - Part 1: General principles
GB/T 1040.2 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics
GB/T 1043.1 Plastics - Determination of charpy impact properties - Part 1: Non-instrumented impact test
GB/T 1222 Spring steels
GB/T 1689 Rubber vulcanized - Determination of abrasion resistance (Akron machine)
GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids
GB/T 2411 Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore hardness)
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3512 Rubber vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 9789 Metallic and other non-organic coatings - Sulfur dioxide test with general condensation of moisture
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 15822.1 Non-destructive testing - Magnetic particle testing - Part 1: General principles
GB/T 19466.3 Plastics - Differential scanning calorimetry (DSC) - Part 3: Determination of temperature and enthalpy of melting and crystallization
JB/T 9151.1 Method of verification for fasteners - Size and geometry - Bolts, screws, studs and nuts
TB/T 2478 Metallographic grading atlas for spring clips
TB/T 3395.1-2015 Fastening systems for high-speed railway - Part 1: General requirements
TB/T 3396.1 Test methods for fastening systems of high-speed railway - Part 1: Determination of longitudinal rail restraint
TB/T 3396.3 Test methods for fastening systems of high-speed railway - Part 3: Determination of static stiffness for fastening assembly
TB/T 3396.4 Test methods for fastening systems of high-speed railway - Part 4: Test of fatigue performance of fastening assembly
TB/T 3396.5 Test methods for fastening systems of high-speed railway - Part 5: Determination of electrical resistance
TB/T 3396.7 Test methods for fastening systems of high-speed railway - Part 7: Vertical load test for cast-in fastening components
YB/T 2010 Hot-rolled sections for fastener of rail
3 Terms and definitions
No terms and definitions are listed in this document.
4 Composition of fastening system
A Type I fastening system consists of spring clip (except that Type B spring clips are used at No.14 joint gauge baffle, Type A spring clips are used), gauge baffle, baffle seat, underrail backing plate, nut, flat washer, screw spike, and optional underrail height adjustment backing plate. The assembly of the fastening system is shown in the figure.
Dimensions in millimetres
Keys:
1——Nut;
2——Flat washer;
3——Spring clip;
4——Gauge baffle;
5——Baffle seat;
6——Screw spike;
7——Underrail backing plate;
8——Underrail height adjustment backing plate;
9——Rail (50 kg/m).
Figure 1 Schematic diagram for the assembly of Type I fastening system
5 Assembly performance
5.1 Longitudinal rail resistance
If tested according to TB/T 3396.1, the longitudinal rail resistance of each group of fastening system shall not be less than 11 kN.
5.2 Assembly fatigue performance
5.2.1 After 3 × 106 load cycles, no parts and components of the fastening system shall be damaged, and the gauge expansion shall not be greater than 6 mm; after the fatigue test, the change rate of static stiffness shall not be greater than 25% in the assembly of the fastening system.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Composition of fastening system
5 Assembly performance
6 Technical requirements for parts and components
7 Inspection methods
8 Inspection rules
9 Mark and packaging
10 Storage and transportation
11 Assembly and configuration
Annex A (Informative) Assembly and configuration of Type I fastening system
