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GB/T 14370-2015: Anchorage, grip and coupler for prestressing tendons 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 14370: Historical versions
Similar standardsGB/T 14370-2015: Anchorage, grip and coupler for prestressing tendons---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/GBT14370-2015GB NATIONAL STANDARD ICS 91.080.40 Q 73 Replacing GB/T 14370-2007 Anchorage, grip and coupler for prestressing tendons Issued on. SEPTEMBER 11, 2015 Implemented on. AUGUST 01, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 6 2 Normative references... 6 3 Terms and definitions, symbols... 7 4 Product classification, code and marking... 11 5 General requirements... 13 6 Requirements... 15 7 Test methods... 18 8 Inspection rules... 28 9 Marking, packaging, transport and storage... 32 Appendix A (Normative) Test method for force transmission performance of anchorage zone... 34 Appendix B (Normative) Test method for low temperature anchoring performance... 43 Appendix C (Normative) Draw-in test method... 48 Appendix D (Normative) Test method for prestress loss due to friction at anchorage device... 521 ScopeThis standard specifies terms and definitions, symbols, product classification, code and marking, general requirements, requirements, test methods, inspection rules and marking, packaging, transport and storage of anchorage, grip and coupler for prestressing tendons. This standard applies to anchorages and couplers used for the anchorage, grip, coupler and cable used in the prestressed structure of internal and external reinforcement with bonding, without bonding, or with slow bonding AND in the special construction process.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) are applicable to this Standard. GB/T 197 Common thread - Tolerances GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1.Test methods (A, B, C, D, E, F, G, H, K, N, T) GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test methods GB/T 1348 Spheroidal graphite iron castings GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications GB/T 5223 Steel wire for prestressing of concrete GB/T 5223.3 Steel bars for prestressed concrete G/T 5224 Steel strand for prestressed concrete GB/T 9439 Gray iron castings GB/T 9969 General principles for preparation of instructions for use of industrial products3 Terms and definitions, symbolsThe following terms and definitions apply to this document. 3.1 terms and definitions 3.2 Symbols The following symbols apply to this document. Apk - The nominal cross-sectional area of the prestressing tendons, in square millimeters (mm2);4 Product classification, code and marking4.1 Product classification In accordance with the anchoring method of the prestressing tendons, the anchorage, grip and coupler can be divided into four basic types. clip type, support type, grip type and combination type. 4.2 Code The codes of anchorage, grip and coupler are as shown in Table 1. 4.3 Markings The marking of the anchor, grip and coupler consists of the product code, the prestressing tendon type, the prestressing tendon diameter, and the number of prestressing tendons (the manufacturer's system code is only marked if necessary). 4.4 Anchorage and coupler for cable The classification, code and marking of the anchorage and coupler for cable shall follow the provisions of JG/T 330.5 General requirements5.1 Material 5.1.1 The materials used in the product shall comply with the design requirements, AND have mechanical properties and chemical composition certificate, as well as quality assurance. Materials shall be subjected to acceptance test after entering into factory, AND only those passing the test can be used. 5.2 Manufacturing 5.2.1 The product shall be processed in accordance with the requirements of the technical documentation. The cutting parts shall comply with the provisions of JB/T 5000.9. 5.3 Appearance, dimension and hardness 5.3.1 The appearance of the product shall be in accordance with the technical documentation AND shall comply with the following. 5.3.2 The dimension and deviation of the product shall comply with the requirements of the technical documentation. 5.3.3 The hardness of the product shall comply with the requirements of the technical documentation. 5.4 Quality documents Anchorages, grips and couplers shall have complete design documents, quality documentation of raw materials, manufacturing batch records, and performance inspection records, all of which shall be traceable. 5.5 Other requirements 5.5.1 Anchorage 5.5.2 Grip 5.5.2.1 Grip shall be reusable. 5.6 Anchorage and coupler for cable The general requirements for anchorage and coupler for cables may make reference to the relevant provisions of this standard OR otherwise comply with the provisions of relevant national current standards.6 Requirements6.1 Anchorage 6.1.1 Static load anchoring performance 6.1.1.1 The anchorage efficiency coefficient ηa AND the total elongation εTu of the assembly prestressing tendon tension length shall comply with the requirements of Table 2. 6.1.2 Fatigue load performance 6.1.2.1 Prestressing tendon - anchorage assembly shall be able to pass the 2 million times fatigue load performance tests AND comply with the following provisions. 6.1.2.2 Prestressing tendon - anchorage assemblies shall not be subjected to anchorage fatigue damage after 2 million times of cycling load. The fatigue damage cross-sectional area of the prestressing tendons due to holding effect of the anchorages shall not be greater than 5% of the total cross-sectional area of the prestressing tendons in the assembly. 6.1.3 Anchorage zone force transmission performance The bearing plate and the spiral reinforcement fitted with the anchorage shall be capable of transmitting the preload applied by the anchorages to the anchorage zone of the concrete structure. 6.1.4 Low temperature anchoring performance The anchorage with low temperature anchoring performance requirements under non-natural conditions shall be subjected to the low temperature anchorage performance test AND shall comply with the following requirements. 6.1.6 Draw-in When using the process of tensioning without top pressure, the draw-in of the prestressing tendon of the clip type anchorage used by the Φ15.2 steel strand shall be not more than 6 mm. 6.1.7 Prestress loss due to friction at anchorage device The prestress loss due to friction at anchorage device shall not be more than 6%. 6.1.8 Tensioning anchorage process The anchorage shall comply with the requirements of graded tensioning, additional tensioning, and release tensioning, etc. Tensioning anchorage process shall be easy to operate, AND the loading force is uniform and stable. 6.2 Grip 6.3 Coupler The performance of the coupler which is permanently left in the concrete structure or component after tensioning shall be in accordance with the provisions of 6.1; AND the coupler which needs to be released and disassembled after tensioning shall comply with the requirements of 6.2.7 Test methods7.1 General provisions 7.1.1 Prestressing tendons for testing 7.1.2 Prestressing tendon - anchorage, grip or coupler assembly for test 7.1.2.1 The prestressing tendon - anchorage, grip or coupler assembly for test shall be assembled by the product parts and the prestressing tendons. 7.2 Appearance, dimension and hardness test 7.2.1 Product appearance shall be tested using the visual observation method; the anchor plate and the coupler body shall be subjected to surface magnetic powder detection in accordance with the requirements of GB/T 15822.1; AND other parts surface may be checked by magnifying lens. 7.3 Static load anchoring performance test 7.3.1 Prestressing tendons - anchorage or grip assembly may be subjected to the static load anchoring performance test using the device as shown in Figure 2. 7.4 Fatigue load performance test 7.4.1 The prestressing tendon - anchorage or coupler assembly shall be subjected to fatigue load performance test on the fatigue testing machine, AND it is preferable for the tested assembly to be fitted with all prestressing tendons; when the fatigue test machine capacity is not enough, it may reduce the number of the prestressing tendons, BUT it shall be not less than 1/2 of the actual number, with the prestressing tendon at the maximum angle with the axis of the prestressing tendon being included in the test range. 7.9 Prestress loss due to friction at anchorage device The test of the prestress loss due to friction at anchorage device shall be carried out in accordance with the provisions of Appendix D. 7.10 Tensioning anchorage process test 7.10.1 In accordance with the structure of prestressing tensioned anchoring system, DESIGN and FABRICATE special reinforced concrete component as the test platform, with the reinforced concrete member length not less than 3 m. It may also conduct test at the construction site.8 Inspection rules8.1 Inspection classification 8.1.1 Inspection of anchorage, grip and coupler is divided into exit-factory inspection and type inspection. 8.1.2 A type inspection shall be carried out in any of the following cases. 8.2 Inspection items The inspection items of exit-factory inspection and type inspection shall comply with the requirements of Table 5. 8.4 Judgment of test results 8.4.1 Exit-factory inspection 8.4.1.1 Appearance All tested samples shall comply with the requirements; if a part does not comply with the requirements, all the products of this batch shall be inspected one by one, AND this part shall be deemed as qualified if it complies with requirements. 8.4.2 Type inspection 8.4.2.1 Appearance, dimension, hardness, static load anchoring performance, fatigue load performance, anchorage zone force transmission performance, low temperature anchoring performance, and anchor plate strength9 Marking, packaging, transport and storage9.1 Marking In the large end plane of the clip, the large end plane of the anchor plate and coupler cone hole, and the large end plane of the bearing plate, there shall be the enterprise logo and the product specification marking. 9.2 Packaging 9.2.1 Anchorage, grip and coupler shall, during exit-factory, be subjected to rust treatment AND packaging in boxes. 9.2.5 The preparation of the product brochures shall be in accordance with the requirements of GB/T 9969 AND shall include the following. 9.2.6 Other technical conditions for product packaging shall comply with the requirements of JB/T 5000.13. 9.3 Transport and storage 9.3.1 During transport and storage, anchorages, grips, couplers, bearing plates and spiral reinforcements shall be kept in a safe manner to prevent corrosion, contamination, mechanical damage or loss. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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