Electrified railway catenary portal structure - Part: Scope of lattice portal structure - This part specifies the technical requirements, inspection rules, test methods, markings, factory certificates, storage and transportation requirements for electrified railway catenary portal structure. This section is applicable to electrified railway contact grid structure portal structures (hereinafter referred to as grid structure portal structures). Similar contact grid structure portal structures used in urban rail transit can refer to this section, and should not be used in passenger dedicated lines. The clauses in the following normative references are referred to as clauses in this part of TB/T2920. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions do not apply to this section. However, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this section. GB/T 41 Hexagon Nuts, Grade C (GB/T 41-2000, eqv ISO 4034; 1999) GB/T 95 Plain Washers, Grade C (GB/T 95-2002, eqv ISo 7091; 2000) GB/T 97.1 Plain Washers, Grade A (GB/T 97.1-2002, eqv ISO 7089; 2000) GB/T 470 Zinc Ingots (GB/T 470-1997, eqv ISO 752:1981) GB/T 700-2006 Carbon Structural Steels (ISO 630:1995, NEQ) GB/T 1591 Low Alloy High Strength Structural Steels, GB/T 2694-2003 Technical Conditions for Manufacturing Transmission Line Towers, GB/T 3098.1 Mechanical Properties of Fasteners, Bolts, Screws and Studs (GB/T 3098.1-2000, idt ISO 898-1:1999) GB/T 3098.2 Mechanical Properties of Fasteners Nuts Coarse Thread (GB/T 3098.2-2000, idt ISO 898-2:1992) GB/T 5117 Carbon Steel Electrodes GB/T 5118 Low Alloy Steel Electrodes GB/T 5293 Carbon Steel Welding Wires and Fluxes for Submerged Arc Welding GB/T 5780 Hexagonal Head Bolts, Grade C (GB/T 5780-2000, eqv ISO 4016:1999)
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