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GB 50205-2020 English PDF (GB50205-2020)

GB 50205-2020 English PDF (GB50205-2020)

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GB 50205-2020: Standard for acceptance of construction quality of steel structures

In order to strengthen the quality management of construction projects, unify the acceptance of construction quality of steel structure projects, ensure the quality of steel structure projects, this standard is hereby formulated. This standard is applicable to the acceptance of construction quality of steel structure engineering of industrial and civil buildings and structures.
GB 50205-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P GB 50205-2020
Standard for acceptance of construction quality of
steel structures
ISSUED ON: JANUARY 16, 2020
IMPLEMENTED ON: AUGUST 01, 2020
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
State Administration for Market Regulation.
Table of Contents
Foreword ... 8
1 General requirements ... 12
2 Terms and symbols ... 12
2.1 Terms ... 12
2.2 Symbols ... 14
3 Basic requirements ... 15
4 Materials and products approach ... 17
4.1 General requirements... 17
4.2 Steel sheet ... 17
4.3 Steel profiles and pipes ... 19
4.4 Steel castings ... 20
4.5 Cables, tie rods and anchorage ... 22
4.6 Welding materials ... 23
4.7 Fasteners for connections ... 24
4.8 Materials of spherical joints ... 26
4.9 Profiled metal plate... 27
4.10 Membrane materials of membrane structures ... 28
4.11 Coating materials ... 29
4.12 Products and others ... 30
5 Welding engineering ... 30
5.1 General requirements... 30
5.2 Welding engineering of steel member ... 31
5.3 Stud (welding nail) welding engineering ... 37
6 Connection engineering of fasteners ... 38
6.1 General requirements... 38
6.2 Connection of ordinary fasteners ... 39
6.3 Connection of high strength bolts ... 40
7 Processing of steel parts and steel components ... 42
7.1 General requirements... 42
7.2 Cutting ... 42
7.3 Rectification and formation ... 43
7.4 Trimming of edges ... 48
7.5 Processing of spherical joints ... 50
7.6 Processing of steel castings ... 53
7.7 Holing ... 55
8 Assembling engineering of steel elements ... 57
8.1 General requirements... 57
8.2 Assembling and butting of components ... 57
8.3 Assembling ... 59
8.4 Milling of element ends and compacting of contact surface ... 61
8.5 Shapes and sizes of steel elements ... 62
9 Test assembling engineering of steel elements ... 70
9.1 General requirements... 70
9.2 Entity test assembling ... 71
9.3 Simulation test assembling... 72
10 Installation engineering of steel frame structures ... 73
10.1 General requirements... 73
10.2 Foundation and anchor bolts (anchor) ... 74
10.3 Installation of steel columns ... 76
10.4 Installation of steel roof truss (shelves), beam (truss) ... 79
10.5 Installation of connection joints ... 82
10.6 Installation of steel sheet shear wall... 83
10.7 Installation of supports, purlins, wall frames and secondary structures ... 85 10.8 Installation of steel platform and stairs ... 86
10.9 Overall steel structures ... 88
11 Installation engineering of space structures ... 90
11.1 General requirements ... 90
11.2 Installation of bearing and anchor bolt (anchor) ... 90
11.3 Installation of steel grid structure and reticulated shell ... 92 11.4 Steel pipe truss structure ... 94
11.5 Making of cable and member ... 95
11.6 Making of membrane element ... 97
11.7 Installation of cable and member ... 98
11.8 Installation of membrane structures ... 99
12 Profiled metal sheet engineering ... 100
12.1 General requirements... 100
12.2 Making of profiled metal sheet ... 101
12.3 Installation of profiled metal sheet ... 103
12.4 Installation of fixation apparatus ... 106
12.5 Connection construction and joints ... 108
12.6 Metal roofing system ... 108
13 Coating engineering ... 109
13.1 General requirements... 109
13.2 Anticorrosive coating painting ... 110
13.3 Coating of connection parts and repairing of coating defects ... 112 13.4 Fire resistant paint coating ... 114
14 Parts projects completion acceptance of steel structures ... 115
Appendix A Inspection items and methods of steel products ... 118
Appendix B Inspection items of fastener connection engineering ... 122 Appendix C Wind resistant performance testing methods of metal roofing
system ... 128
Appendix D Procedure qualification of anticorrosive coating ... 134
Appendix E Determination methods of fire resistant paint coating thickness138 Appendix F Inspection and evidential testing of safety and function about sheet structures ... 140
Appendix G Inspection items for quality of appearance about steel structures ... 142
Appendix H Records of inspection batches of item for quality acceptance .. 143 Appendix J Method of quantity survey for steel structure ... 158
Explanation of wording in this standard ... 160
List of quoted standards ... 161
Standard for acceptance of construction quality of
steel structures
1 General requirements
1.0.1 In order to strengthen the quality management of construction projects, unify the acceptance of construction quality of steel structure projects, ensure the quality of steel structure projects, this standard is hereby formulated. 1.0.2 This standard is applicable to the acceptance of construction quality of steel structure engineering of industrial and civil buildings and structures. 1.0.3 This standard should be used in conjunction with the current national standard "Unified acceptance standard for building construction quality" GB 50300.
1.0.4 In addition to this standard, the acceptance of construction quality of steel structure projects shall also comply with the current relevant national standards. 2 Terms and symbols
2.1 Terms
2.1.1 Part
The smallest unit that constitutes a part or component, such as a gusset sheet, a flange sheet, etc.
2.1.2 Component
A unit composed of several parts, such as welded H-beams, steel brackets, etc. 2.1.3 Element
The basic unit of steel structure composed of parts or parts and components, such as beams, columns, supports, etc.
2.1.4 The smallest assembled rigid unit
In the installation project of steel grid and reticulated shell structure, the smallest installation unit except for the loose parts, which is generally divided into two The profiled metal sheet whose longitudinal edges of the formed sheet are profiled edges that can be overlapped with each other, whose sheets are connected to structures through fasteners after being naturally overlapped. 2.1.16 Up standing seam metal sheet
The profiled metal sheet whose longitudinal edges of the formed sheet are profiled edges that can be overlapped with each other and, after the sheet and the sheet are naturally overlapped, which are crimped along the length direction by a special machine and connected to the structure through a fixed bracket. 2.1.17 Clip-lock metal sheet
The profiled metal sheet whose longitudinal sides of the formed sheet are profiled edges that can be overlapped with each other and the sheet-sheet installation of which is connected to the structure through a fixed bracket, after being clipped and pressed-in.
2.1.18 Flashing
An element having a certain shape as formed by rolling or mechanical bending of metal sheet, which is used to seal the edges of the gaps after the roof and wall profiled metal sheets are paved to prevent rainwater leakage.
2.1.19 Metal roofing system
The general term for the roof enclosure system composed of metal panels, fixed brackets, bottom plates, fasteners, heat preservation, moisture proof, heat insulation, sound insulation and other materials.
2.2 Symbols
2.2.1 Function and effect:
P - Design value of pretension of high-strength bolt;
??P - The loss of the pretension of the high-strength bolt;
Tch - Checking torque of high-strength bolt;
Tc - Final tightening torque of high-strength bolts;
T0 - Initial tightening torque of high-strength bolt.
2.2.2 Geometric parameters:
?? - Spacing;
construction of steel structure projects shall have the requirements for the acceptance of the construction quality of not lower than the provisions of this standard.
3.0.4 The construction quality control of steel structure engineering shall be carried out in accordance with the following provisions:
1 The raw materials and finished products used shall be subject to
mobilization acceptance. All raw materials and finished products involving safety and function shall be re-inspected in accordance with the provisions of 14.0.2 of this standard, meanwhile the sampling and sample delivery
shall be witnessed by the supervision engineer (technical person in charge of the construction organization);
2 The quality control of each process shall be carried out according to the construction technical standards; inspection shall be carried out after each process is completed;
3 The handover inspection shall be carried out between the relevant trades; it shall be inspected and approved by the supervision engineer (the
technical person in charge of the construction organization).
3.0.5 Acceptance of construction quality of steel structure engineering shall be carried out in accordance with inspection batches, item work, divisional (sub- divisional) work on the basis of qualified self-inspection by the construction organization. The division of item work in the divisional (sub-divisional) work of the steel structure engineering shall be implemented in accordance with the current national standard "Unified acceptance standard for building
construction quality" GB 50300. The steel structure item work shall be
composed of one or several inspection batches, the inspection batches of each item work shall be divided according to the provisions of this standard; meanwhile it shall be confirmed by the supervisor (or construction organization). 3.0.6 The qualified quality standard of the inspection batch shall meet the following requirements:
1 The main control items must meet the quality requirements of this standard; 2 The inspection results of general items shall have 80% or more check
points (values) that meet the requirements of this standard, meanwhile the maximum (or minimum) value shall not exceed 1.2 times the allowable
deviation value.
3.0.7 The qualified quality standards for item work shall meet the following requirements:
1 Each inspection batch included in the item work shall meet the quality 4.2.1 The variety, specification and performance of steel sheets shall meet the requirements of current national standards and meet design
requirements. When the steel sheet enters the site, the test pieces shall be taken according to the current national standards, to be subject to the testing of the yield strength, tensile strength, elongation and thickness deviation. The testing results shall comply with the current national
standards.
Inspection quantity: All quality certification documents are inspected; the sampling quantity is determined according to the mobilization batch and the sampling inspection plan of the product.
Inspection method: Check quality certification documents and sampling
inspection report.
4.2.2 The steel sheet shall be subject to the witnessed sampling and
reinspection in accordance with Appendix A of this standard. The results of the re-inspection shall meet the requirements of the current national standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Witness the sampling and sample delivery; check the re- inspection report.
II General items
4.2.3 The thickness of the steel sheet and its allowable deviation shall meet the requirements of its product standards and design documents.
Inspection quantity: Spot inspection for 10% of each batch of steel sheets of the same variety and specification; meanwhile it is no less than 3 pieces, 3 locations per piece shall be inspected.
Inspection method: Use vernier caliper or ultrasonic thickness gauge to make measurement.
4.2.4 The flatness of the steel sheet shall meet the requirements of its product standards.
Inspection quantity: Spot inspection for 10% of each batch of steel sheets of the same variety and specification; meanwhile it is no less than 3 pieces, 3 locations per piece shall be inspected.
Inspection method: Use stayguy, steel ruler and vernier caliper for
measurement.
4.2.5 The surface appearance quality of the steel sheet shall not only meet the Inspection quantity: Follow the Appendix A of this standard to carry out inspection based on the re-inspection batch size.
Inspection method: Witness the sampling and sample delivery; check the re- inspection report.
II General items
4.3.3 The cross-sectional size, thickness and allowable deviation of profiles and pipes shall meet the requirements of their product standards.
Inspection quantity: Spot inspection for 10% of each batch of profiles of the same variety and specification; meanwhile it is no less than 3 pieces, 3 locations per piece shall be inspected.
Inspection method: Use steel ruler, vernier caliper and ultrasonic thickness gauge for measurement.
4.3.4 The allowable deviation of the profile and pipe dimensions shall meet the requirements of their product standards.
Inspection quantity: Spot inspection for 10% of each batch of profiles of the same variety and specification; meanwhile it is no less than 3 pieces, 3 locations per piece shall be inspected.
Inspection method: Use stayguy and steel ruler for measurement.
4.3.5 The surface appearance quality of profiles and pipes shall meet the requirements of Article 4.2.5 of this standard.
Inspection quantity: Inspection for all.
Inspection method: Observation inspection.
4.4 Steel castings
I Main control item
4.4.1 The types, specifications and performance of the steel castings shall meet the requirements of the current national standards and meet the
design requirements. When the steel castings enter the site, test pieces shall be taken according to the current national standards, to be subject to the inspection of the yield strength, tensile strength, elongation and thickness deviation; the inspection results shall comply with the current national standards.
Inspection quantity: All quality certification documents are inspected; the 4.5 Cables, tie rods and anchorage
I Main control item
4.5.1 The types, specifications and performance of the cables, tie rods and anchorages shall meet the requirements of the current national
standards and meet the design requirements. When the cables, tie rods
and anchorages enter the site, test pieces shall be taken according to the current national standards, to be subject to the inspection of the yield strength, tensile strength, elongation and thickness deviation; the
inspection results shall comply with the current national standards.
Inspection quantity: All quality certification documents are inspected; the sampling quantity is determined according to the sampling inspection
plan of the incoming batches and products.
Inspection method: Check quality certification documents and sampling
inspection report.
4.5.2 The cables, tie rods, anchorages shall be sampled for re-inspection in accordance with the provisions of Appendix A of this standard; the re-inspection results shall meet the requirements of the current national standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Witness the sampling and sample delivery; check the re- inspection report.
II General item
4.5.3 The allowable deviation of the dimensions of cables, tie rods, anchorages and their connectors shall meet the requirements of their product standards and design.
Number of inspections: Inspection for all.
Inspection method: Use steel ruler, vernier caliper and stayguy for
measurement.
4.5.4 The surface of the cable, the tie rod and its sheath shall be smooth; there shall be no cracks and visual defects such as folding, delamination, scarring and erosion.
Inspection quantity: Inspection for all.
Inspection method: Observation inspection.
Inspection quantity: Spot inspection for 1% per batches and shall not be less than 10 sets.
Inspection method: Use steel ruler and vernier caliper for measurement. 4.6.4 The construction organization shall re-inspect the mechanical properties and welding performance of the welding studs in accordance with the current national standard "Cheese head studs for arc stud welding" GB/T 10433; the results of the re-inspection shall meet the requirements of the current national standards and meet the design requirements.
Inspection quantity: A set of re-inspections shall be carried out for each batch number and it shall not be less than 5 tensile and 5 bending tests.
Inspection method: Witness the sampling and sample delivery; check the re- inspection report.
4.6.5 The appearance of the welding rod shall not have defects such as peeling of the coating or the welding core rust; the flux shall not be damp and agglomerate.
Inspection quantity: Spot inspection for 1% per batches and shall not be less than 10 packages.
Inspection method: Observation inspection.
4.7 Fasteners for connections
I Main control items
4.7.1 The variety, specification and performance of the assemble of high- strength bolt for steel structure connection shall meet the requirements of the current national standards and meet the design requirements. The assemble of high-strength large hexagon head bolt shall be accompanied
by a torque coefficient inspection report; the torsion-shear type assemble of high-strength bolt shall be accompanied by a tightening axial force
(pre-tension) inspection report. When the high-strength large hexagon
head bolt assemble and the torsion-shear type high-strength bolt
assemble enter the site, the test pieces shall be taken according to the current national standards and the torque coefficient for testing of the torque coefficient and tightening axial force (pre-tension), respectively. The inspection results shall meet the requirements of the current national standards.
Inspection quantity: All quality certification documents are inspected; the sampling quantity is determined according to the sampling inspection
results shall meet the requirements of their product standards.
Inspection quantity: Random check 8 pieces according to specifications. Inspection method: Use hardness tester for measurement.
4.7.7 For ordinary bolts, self-tapping screws, rivets, pull rivets, shot nails, anchor bolts (mechanical and chemical reagent type), anchor bolts and other fastening standard parts, nuts, washers, etc., their varieties, specifications, performance shall meet the requirements of the current national product standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark and inspection report, etc.
4.8 Materials of spherical joints
I Main control item
4.8.1 The types, specifications and performance of the raw materials used to make the bolt sphere shall meet the requirements of the current national standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method: Check the product quality certificate, Chinese product mark and inspection report, etc.
4.8.2 The types, specifications, performances, etc. of the raw materials used in the production of sealing plates, cones and sleeves shall comply with the current national standards and meet the design requirements.
Inspection quantity: Inspection for all.
Inspection method...

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