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GB/T 2694-2018: Specification of manufacturing for transmission line tower Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 2694: Historical versions
Similar standardsGB/T 2694-2018: Specification of manufacturing for transmission line tower---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2694-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.240.99 K 47 Replacing GB/T 2694-2010 Specification of manufacturing for transmission line tower Issued on. JULY 13, 2018 Implemented on. FEBRUARY 01, 2019 Issued by. State Administration for Market Regulation; National Standardization Administration. Table of ContentsForeword... 4 1 Scope... 5 2 Normative references... 5 3 Terms and definitions, symbols... 7 3.1 Terms and definitions... 7 3.2 Symbols... 9 4 General... 9 5 Materials... 10 5.1 Steel... 10 5.2 Welding materials... 11 5.3 Fasteners... 11 5.4 Zinc ingots... 11 6 Technical requirements... 12 6.1 Cutting... 12 6.2 Marking... 12 6.3 Forming (bending, flattening, opening and closing angles)... 13 6.4 Hole making... 14 6.5 Root cleaning, back shoveling, beveling... 15 6.6 Welding... 16 6.7 Assembly of welded parts... 23 6.8 Correction... 24 6.9 Hot dip galvanizing... 24 6.10 Trial assembly... 25 7 Inspection... 27 7.1 Certificate of conformity... 27 7.2 Inspection items... 27 7.3 Inspection requirements and methods... 27 7.4 Sampling plan and judgment principle... 29 8 Packaging, marking, transportation, storage... 33 8.1 Packaging... 33 8.2 Marking... 33 8.3 Transportation and storage... 33 9 Data handover requirements... 34 Appendix A (Normative) Hot-dip galvanizing layer uniformity test - Copper sulfate test method... 35 Appendix B (Normative) Hot-dip galvanized layer adhesion test - Drop hammer test method... 37 Appendix C (Normative) Test method for hot-dip galvanized layer thickness - Metal coating thickness gauge test method... 38 Appendix D (Normative) Hot-dip galvanized layer adhesion test -- Dissolution weighing test method... 391 ScopeThis standard specifies the materials, technical requirements, inspection, packaging, marking, transportation, storage in the manufacturing process of transmission line towers (hereinafter referred to as "towers"). This standard applies to the manufacturing of angle steel towers for transmission lines. It can be used as a reference for the manufacturing of power microwave towers, power communication towers and similar steel structures.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 41 Hexagon nuts, style 1 - Product grade C GB/T 95 Plain washers - Product grade C GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 470 Zinc ingots GB/T 699 Quality carbon structure steels GB/T 700 Carbon structural steels GB/T 702 Hot-rolled steel bars - Dimensions, shape, weight and tolerances GB/T 706 Hot rolled section steel GB/T 709 Dimension shape weight and tolerances for hot-rolled steel plates and sheets3 Terms and definitions, symbols3.1 Terms and definitions The following terms and definitions apply to this document. 3.2 Symbols The following symbols apply to this document.4 General4.1 The manufacture and inspection of the tower shall meet the design requirements. When the design needs to be modified, the consent of the design organization shall be obtained and the design change document shall be signed. 4.2 Matters not specified in this standard shall comply with the provisions of the relevant current national standards. 4.4 The production process of the tower shall comply with the provisions of the environment, safety, occupational health.5 Materials5.1 Steel 5.1.1 The specifications and grades of steel used in the manufacture of the tower shall be selected according to the design requirements; 5.1.2 Steel materials shall have traceability marks. If the original traceability marks are split during the manufacturing process, the marks shall be transplanted before the materials are split. 5.2 Welding materials 5.2.1 The quality of welding materials such as welding rods, welding wires, fluxes shall comply with the provisions of GB/T 5117, GB/T 5118, GB/T 5293, GB/T 8110, GB/T 10045, GB/T 12470, GB/T 17493. 5.2.2 The coating on the surface of the welding rod shall not fall off or be damp. The surface of the welding wire shall be smooth and flat; there shall be no burrs, scratches, rust, oxide scale or other impurities that have adverse effects on welding performance and welding equipment operation performance. 5.2.3 The welding gas shall meet the requirements of GB/T 6052 and HG/T 3728. 5.2.4 Before the first use of each welding material, the mechanical properties test of the deposited metal shall be carried out. 5.2.5 The management of welding materials shall comply with the provisions of JB/T 3223. 5.3 Fasteners 5.4 Zinc ingots The quality requirements, test methods, inspection rules and markings, packaging, transportation and storage of zinc ingots shall comply with the provisions of GB/T 470.6 Technical requirements6.1 Cutting 6.1.1 After cutting, there shall be no cracks or edge defects greater than 1.0 mm on the fracture. The flatness of the cut surface shall not be greater than 0.05t (t is the thickness) and shall not be greater than 2.0 mm. The depth of the cut mark shall not be greater than 0.3 mm. The allowable deviation of the local notch depth is 1.0 mm. 6.2.2 The steel stamps of the identification shall be arranged neatly; the font shall not have defects; the font height is 8 mm ~ 18 mm. 6.2.3 The steel stamp shall not be pressed on the hole making, bending, milling, welding parts. 6.3 Forming (bending, flattening, opening and closing angles) 6.4 Hole making 6.4.1 The punching surface shall not have obvious concave defects; burrs larger than 0.3 mm shall be removed. After hole making, there shall be no missing edges or collapsed angles larger than 0.5 mm at the boundary intersection between the hole wall and the part surface. The allowable deviation of hole making shall comply with the provisions of Table 4. 6.6 Welding 6.6.1 Welding procedure qualification For the steel, welding materials, welding methods, structural forms, preheating, post- treatment, etc., which are used for the first time, welding procedure qualification shall be carried out in accordance with GB 50661 before welding work; welding process specifications and welding operation instructions shall be prepared. 6.6.2 Welder qualification 6.6.4 Welding groove 6.6.4.1 The form and size of the welding groove shall comply with the relevant provisions of GB/T 985.1 and GB/T 985.2.The form and size of the groove with special requirements for the drawings shall be determined, based on the drawings and combined with the welding procedure qualification. 6.6.4.2 The welding groove shall be processed by mechanical methods first. When flame cutting is used, the weld groove shall be flat, free of burrs, cracks, gas cutting nodules, interlayers or other defects. 6.6.5 Welding rework7 Inspection7.1 Certificate of conformity Products shall be inspected and accepted before leaving the factory and a product certificate of conformity shall be issued. 7.3 Inspection requirements and methods 7.4 Sampling plan and judgment principle 7.4.1 Sampling principle 7.4.2 Inspection batch The inspection batch can be composed of several production batches or part of the production batch. The exit-factory inspection batch is determined according to the actual situation. The inspection batch accepted by the buyer shall be based on the contractual agreement between the supplier and the buyer. 7.4.6 Judgment principle 7.4.6.1 Judgment principle for parts When the inspected parts have one of the following conditions, they shall be judged as unqualified. 7.4.6.2 Comprehensive judgment principle If one of the items in Class A is unqualified, the product shall be judged as unqualified; if one of the items in Class B is not less than the rejection number (Re), the product shall be judged as unqualified.8 Packaging, marking, transportation, storage8.1 Packaging 8.1.1 Angle steel packaging 8.1.1.1 The packaging length, number of bundles and weight of angle steel shall be convenient for packaging, transportation, marking. 8.1.2 Connection plate packaging The connection plate packaging should be fastened by long bolts and a lifting point shall be set. 8.2 Marking In addition to meeting the contract requirements, the marking shall also be identified in a conspicuous position on the bundle, indicating the project name, tower type, nominal height, tower number, bundle number, manufacturer name; the marking content shall also meet the requirements of the transportation department. 8.3 Transportation and storage During loading, unloading, transportation and storage, the packaging must not be damaged to cause deformation of the product or damage to the galvanized layer.9 Data handover requirementsThe following information (but not limited to) shall be provided when the tower leaves the factory. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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