Standard No.:	JG/T 160-2017
English Name:	Mechanical anchors for use in concrete
Chinese Name:	混凝土用机械锚栓
Chinese Classification:	P32    Building construction and decoration engineering
Professional Classification:	JG    Professional Standard - Building
ICS Classification:	91.080.40 91.080.40    Concrete structures 91.080.40
Issued by:	AQSIQ, MOHRUD
Issued on:	2017-05-27
Implemented on:	2017-12-1
Status:	valid
Superseding:	JG 160-2004 Expansion and undercut building anchors for use in concrete JG/T 367-2012 Self-undercut & Post-undercut Mechanical Anchors and Undercut Drill Bit for Use in Concrete
Language:	English
File Format:	PDF
Word Count:	22500 words
Price(USD):	560.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the classification and mark, requirements, test methods, inspection rules, marking, product instructions, packaging, transportation and storage of mechanical anchors with concrete as substrate. This standard is applicable to metal anchors anchored on cracked or non-cracked concrete with compressive strength of 25 MPa to 60 MPa. 2 Normative References The following referenced documents are indispensable for the application 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 175 Common Portland Cement GB/T 193 General Purpose Metric Screw Threads - General Plan GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions GB/T 197 General Purpose Metric Screw Threads - Tolerances GB/T 699 Quality Carbon Structure Steels GB/T 700 Carbon Structural Steels GB/T 1220 Stainless Steel Bar GB/T 3077 Alloy Structure Steels GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs GB/T 3098.2 Mechanical Properties of Fasteners - Nuts GB/T 3098.6 Mechanical Properties of Fasteners - Stainless Steel Bolts, Screws and Studs GB/T 3098.15 Mechanical Properties of Fasteners - Stainless Steel Nuts GB/T 4237 Hot Rolled Stainless Steel Plate, Sheet and Strip GB/T 5267.1 Fasteners - Electroplated Coatings GB/T 5267.3 Fasteners - Hot Dip Galvanized Coatings GB/T 6335.1 Rotary and Rotary Impact Masonry Drill Bits with Hardmetal Tips Part1: Dimensions GB/T 9799 Metallic and Other Inorganic Coatings - Electroplated Coatings of Zinc with Supplementary Treatments on Iron or Steel GB/T 13912 Metallic Coatings - Hot Dip Galvanized Coatings on Fabricated Iron and Steel Articles - Specifications and Test Methods GB/T 14684 Sand for Construction GB/T 14685 Pebble and Crushed Stone for Construction GB/T 14975 Seamless Stainless Steel Tubes for Structure GB/T 19292.2 Corrosion of Metals and Alloys - Corrosivity of Atmospheres - Guiding Values for the Corrosivity Categories GB/T 19355.1 Zinc Coatings - Guidelines and Recommendations for the Protection Against Corrosion of Iron and Steel in Structures - Part 1: General Principles of Design and Corrosion Resistance GB/T 19355.2 Zinc Coatings - Guidelines and Recommendations for the Protection Against Corrosion of Iron and Steel in Structures - Part 2: Hot Dip Galvanizing GB/T 19355.3 Zinc Coatings - Guidelines and Recommendations for the Protection Against Corrosion of Iron and Steel in Structures - Part 3: Sherardizing GB/T 25672 Hammer Drills and Shell Hammer Drills GB/T 31303 Austenitic-Ferritic Duplex Stainless Steel Bars JB/T 5067 Sherardizing of Iron and Steel Articles 3 Terminologies, Definitions and Symbols For the purposes of this document, the following terminologies, definitions and symbols apply. 3.1 Terminologies 3.1.1 Mechanical anchors Component that is anchored on a concrete substrate by virtue of friction or locking effect between the anchor and the borehole, with the main stressed members consisting of fasteners (screw, nut, gasket), conical heads and expansion parts (expansion bushing or expansion sheet) that are made of metallic material. 3.1.2 Expansion anchors Anchors with friction, which is generated when expansion part is applied with torque or tapped and therefore squeezes the hole wall, as the main anchorage force. See Appendix A, Figure A.1. 3.1.3 Undercut anchors Anchors with mechanical engaging force, which is generated by locking wedge formed by expansion part which is embedded into the hole expanded by special die bit or hard blade on the anchor expansion part at certain depth of the straight hole when applied with torque or tapped, as the main anchorage force. 3.1.3.1 Pre-drilled undercut anchors Undercut anchors which is installed after hole expansion is carried out with special die bit. See Appendix A, Figure A.2. 3.1.3.2 Self-cutting undercut anchors Undercut anchors with its expansion part having hard blade through which hole expansion and expansion part embedding are completed during anchor installation. See Appendix A, Figures A.3 and A.4. 3.1.3.3 Double-wedge anchors Anchor bolts with upper and lower anchorage points, among which the latter is the undercut locking wedge and main anchorage point, and the former is locking wedge or expansion point and auxiliary anchorage point. See Appendix A, Figure A.5. 3.1.4 Screw anchors Anchor bolts, when are screwed into the drilled hole, cut and embed into the embedding hole wall through self-contained hard threads. See Appendix A, Figure A.6. 3.1.5 Installation torque Tighten torque required to install anchors. 3.1.6 Installation displacement Displacement required to install anchors through tapping. 3.1.7 Torque control Anchor installation method by which torque is applied on anchor screws, nuts or bushings. 3.1.8 Displacement control Anchor installation method by which anchor conical head or bushing is tapped. 3.1.9 Anchorage zone Zone in the concrete within which the anchor transmits external load. 3.1.10 Concrete cone failure Cone failure of concrete formed with anchor as the axis in the anchorage zone under the action of tension. See Appendix A, Figure A.7. 3.1.11 Anchor pull-out failure Failure of concrete formed due to anchor, under the action of tension, slides towards the concrete surface and finally is pulled out, all or partially, from the concrete, or causes failure at shallow position on the concrete that is similar as the concrete cone failure. See Appendix A, Figure A.8. 3.1.12 Anchor steel failure Failure of the metal component of the anchor under the action of tension or shear. See Appendix A, Figure A.9. 3.1.13 Concrete splitting failure Failure of concrete in the form of crack along the vertical line of a single anchor axis or along the common vertical line of multiple anchor axes under the action of tension. See Appendix A, Figure A.10. 3.1.14 Concrete edge failure Semi-conical fracture formed at concrete edge under the action of tension or that formed at the concrete edge in the shear direction under the action of shearing force. See Appendix A, Figure A.10. 3.1.15 Reference test Mechanical property test conducted by drilling holes on the dry concrete with specified strength by using drill with diameter of dm, edge distance and interval of holes not less than 2hef and 4hef respectively, and anchor installed according to the requirements of the product instructions. The test data is usually used as a reference for other tests for comparison. 3.1.16 Coefficient of radial force Ratio of the radial expansion force to the axial tensile force of the anchor under the action of tension. 3.2 Symbols As - the nominal sectional area of the anchor screw part with failure due to tension, mm2; Asv - the nominal sectional area of the anchor part under shearing force, mm2; Asv,b - the screw nominal sectional area at the anchor part under shearing force, mm2; Asv, s - the bushing nominal sectional area at the anchor part under shearing force, mm2; c - the coefficient (constant); dm - the medium diameter of the test drill bit, see Appendix B, mm; dmax - the maximum diameter of the drill bit for test, see Appendix B, mm; dmin - the minimum diameter of the drill bit for test, see Appendix B, mm; fcu - the measured value of compressive strength of concrete cube, MPa; hef - the effective anchorage depth, i.e., the distance from the concrete surface to the anchorage point, see A.1, mm; N - the tensile load, N; N1 - the slip load, N; NRk - the standard value of tensile capacity, N; NRu,m - the average of tensile capacity, N; NRu, s - the tensile capacity of anchor screw steel, N; Rm,min - the minimum tensile strength of anchor screw steel, MPa; Rm,s - the tensile strength of bushing steel, MPa; T - the measured value of the torque limit, N•m; Tinst - the anchor installation torque required in the product instructions, N•m; VRu, s - the shear capacity of anchor steel, N; γmin - the minimum value of the slip coefficient in the test sample; Δw - the crack width, mm; Δw1 - the upper limit of the relative crack width, mm; Δw2 - the lower limit of the relative crack width, mm; δm - the displacement of the anchor during the seismic performance special test cycle, mm; η - the radial force coefficient; vN - the coefficient of variation of tensile capacity; vV - the coefficient of variation of shear capacity; vβ - the coefficient of variation of tensile stiffness.

Foreword i 1 Scope 2 Normative References 3 Terminologies, Definitions and Symbols 4 Classification and Mark 5 General Requirements 6 Requirements 7 Test Methods 8 Inspection Rules 9 Marking and Product Instructions 10 Packaging, Transport and Storage Appendix A (Informative) Examples of Anchor Type and Mode of Anchorage Failure Appendix B (Normative) Bits and Drilled Holes Appendix C (Normative) Fatigue Test Appendix D (Informative) Boundary Parameter Test Appendix E (Normative) Methods and Requirements for Testing Sensitivity of Expansion Anchors and Undercut Anchors to Installation Processes Appendix F (Informative) Special Test and Requirements for Screw Anchors Appendix G (Normative) Concrete Test Pieces Appendix H (Normative) Test Apparatuses Appendix I (Normative) Special Test for Seismic Performance Appendix J (Normative) Test for Coefficient of Radial Force Appendix K (Normative) Test Data Processing