JGJ 78-1991 Standard for Quality Inspection and Assessment of Grid Structure Engineering
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Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Standard for Quality Inspection and Assessment of Grid Structure Engineering JGJ78-91
Engineering Construction Standard Full-text Information System
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Industry Standard of the People's Republic of China
Standard for Quality Inspection and Assessment of Grid Structure Engineering JGJ78-91
Editing Unit: China Academy of Building Research Approving Department: Ministry of Construction of the People's Republic of China Effective Date: April 1, 1992
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Notice on the Release of the Industry Standard "Grid Structure Engineering Quality Inspection and Assessment Standard"
Construction Standard [1991] No. 649
To the Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, the Construction Committees of cities with independent planning status, and relevant departments of the State Council:
According to the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection Document (87) Chengkezi No. 276, the "Grid Structure Engineering Quality Inspection and Assessment Standard" edited by the China Academy of Building Research has been reviewed and approved as an industry standard, numbered JGJ78-91, and will be implemented from April 1, 1992.
This standard is managed and interpreted by the China Academy of Building Research, the technical unit responsible for building engineering standards of the Ministry of Construction. If you have any questions or comments during the implementation process, please inform the China Academy of Building Research in writing.
This standard is organized and published by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
September 29, 1991
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Chapter 1 General Provisions
Chapter 2 Welded Ball Nodes
Chapter 3 Bolted Ball Nodes
Section 1 Bolted Balls
Section 2 High-Strength Bolts
Section 3 Blue
Chapter 4
Chapter 5
Chapter 6
Year 7
Seal Plate, Cone Head, Sleeve
Welded Steel Plate Nodes
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Grid Structure Installation
Electricity and Electric ... 14 Paint, anti-corrosion, fire-proof coating engineering
Test requirements for bearing capacity of test pieces
Terms used in this standard.
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Additional reading
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Chapter 1 General
Article 1.0.1 This standard is formulated to strengthen the management of the quality of grid structure manufacturing and installation, and to carry out the inspection and evaluation of the quality of grid structure engineering. Article 1.0.2 This standard applies to the quality inspection and evaluation of each sub-project in industrial and civil building grid structure engineering.
This standard includes sub-projects such as the production of nodes and rods, grid installation, and painting, anti-corrosion, and fire-proof coating. The inspection and evaluation results of the sub-projects are used to evaluate the quality level of the main sub-projects.
Article 1.0.3 This standard is formulated based on the national standard "Uniform Standard for Inspection and Evaluation of Building Installation Engineering Quality" GBJ300-88 and the industry standard "Grid Structure Design and Construction Code" JGJ791. When conducting grid structure quality inspection and evaluation, the national standard "Construction Engineering Quality Inspection and Evaluation Standard" GBJ301-88, the current national standard "Steel Structure Engineering Construction and Acceptance Code" GBJ205, the industry standard "Bolt Ball Node Grid" JGJ75.191, "Welded Ball Node Grid" JGJ75, 291 and other relevant standards should be followed.
Article 1.0.4 The quality grade assessment of sub-projects shall comply with the following provisions: 1. Qualified:
1. Guaranteed projects must comply with the provisions of the corresponding quality inspection and assessment standards; 2. The parts (items) sampled for basic projects shall comply with the provisions of the qualified column of the corresponding quality inspection and assessment standards;
3. Among the points sampled for the allowable deviation items, 70% or more of the measured values shall be within the allowable deviation range of the corresponding quality inspection and assessment standards. 2. Excellent:bzxz.net
1. Guaranteed projects must comply with the provisions of the corresponding quality inspection and assessment standards; 2. The parts (items) sampled for each basic project shall comply with the provisions of the qualified column of the corresponding quality inspection and assessment standards; if 50% or more of the parts (items) meet the excellent requirements, the project construction standard full-text information system
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items are excellent, and the number of excellent items shall account for 50% or more of the inspection items. 3. Among the points sampled for allowable deviation items, 90% or more of the measured values shall be within the allowable deviation range of the corresponding quality inspection and evaluation standards. Article 1.0.5 For the overall quality grade assessment of the grid structure project where the manufacturing and installation of the grid nodes and rods are completed by the same unit, the following provisions shall be met:
Qualified, the quality of all the sub-projects included is qualified; 2. Excellent: the quality of all the sub-projects included is qualified, of which 50% or more are excellent.
Article 1.0.6 When the grid structure components are provided by a professional product manufacturer, this part shall not participate in the quality inspection and evaluation of the sub-project. However, the contractor of the grid structure project shall be responsible for the incoming acceptance in accordance with the provisions of this standard, check its strength test report and product certificate, and conduct re-inspection according to the items specified in the relevant provisions of this standard, and the quality must meet the product qualification standards.
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Chapter 2 Welded Ball Nodes
(I) Guarantee Items
Article 2.0.1 The variety, specification and quality of raw materials used to manufacture welded ball nodes must meet the design requirements and relevant standards. Welding rods, flux, welding wires and shielding gases used for welding must meet the design requirements and special regulations for steel structure welding. Inspection method Observe and inspect the factory certificate, test report and welding rod baking record. If there is any objection, sampling and re-inspection should be carried out. Article 2.0.2 The weld seam of the welded ball must be subjected to non-destructive inspection, and its quality should meet the secondary quality standards specified in the current national standard "Steel Structure Engineering Construction and Acceptance Code" GBJ205.
Number of inspections: The welds of finished balls of the same specification are batched in 300 pieces (for those less than 300 pieces, they are counted as one batch. Three pieces are randomly selected from each batch. If all of them meet the quality standards, they are qualified. If one piece fails, double the sampling and inspection. Only when all six pieces meet the quality standards can they be considered qualified.
Inspection method: Ultrasonic flaw detection or inspection of factory certificate. Article 2.0.3: Welded ball nodes must be welded into test pieces according to the steel pipe and ball used in the design, and the bearing capacity of unidirectional axial tension and compression must be tested. The test results must comply with the Appendix 1.
Number of inspections For each project, the ball nodes with the most unfavorable stress can be taken as the first batch of 600. If there are less than 600, it will still be counted as one batch. Three nodes in each batch will be randomly inspected as a group. The inspection method is to use a tension or pressure testing machine or a corresponding loading test device. On-site inspection of product test reports and certificates. For grid structures used in public buildings with a safety level of one and a span of 40m or more, and when there is doubt about the quality, on-site re-inspection is required. Engineering Construction Standard Full-text Information System
bzSosO, COm Engineering Construction Standard If any of the following conditions occur during the test, the ball can be judged to have reached its ultimate load-bearing capacity and destroyed the ring: 1. When the load reading of the instrument does not rise when the load is continued, the reading is the ultimate destruction value; 2. The peak value of the curve on the F-△ curve (F-
-load weight; △-
-deformation along the longitudinal axis of the force under the corresponding load) is taken as the ultimate destruction value. (I) Basic Items Article 2.0.4 Welding Ball Surface The following requirements shall be met: Qualified: No obvious ripples and local unevenness not exceeding 1.5mm. Excellent: Smooth and flat, no ripples, local unevenness not exceeding 1.0mm. The number of inspections shall be 5% of various specifications, but not less than 5 pieces of each type. The inspection method is to use an arc-shaped die and a steel ruler for visual inspection. Article 2.0.5 The wall thickness reduction of the finished ball shall meet the following requirements. Qualified: The thinning amount is less than or equal to 13%, and does not exceed 1.5mm. Excellent: The thinning amount is less than or equal to 10%, and does not exceed 1.2mm. The number of inspections is the same as that of Article 2.0.4. The inspection method is to use an ultrasonic thickness gauge. On-site re-inspection. () Allowable deviation items
Article 2.0.6 The allowable deviation and inspection method of welded balls shall comply with the provisions of Table 2.0.6.
Allowable deviation and inspection method of welded balls
The height of the ball weld is flush with the surface of the ball
2 Ball diameter D<300
Ball diameter D>300
Allowable deviation
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Use a weld gauge to check 8 points equally along the circumference of the weld
Use a caliper and a vernier card to check, and measure three values for each ball
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Roundness of ball D<300
Roundness of ball D>300
Misalignment of two hemispheres
Allowance deviation
Testing method
Check with calipers and vernier calipers, measure three pairs of each ball, each pair is 90° to each other, and use the average value of the diameter difference of the three pairs to check with a set die and vernier caliper, and take one point at the maximum misalignment of each ball
Number of inspections 5% of each specification shall be randomly inspected, and no less than 5 pieces. Engineering Construction Standard Full Text Information System
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Chapter 3 Bolted ball joint
Section 1 Bolted ball
(I) Guarantee items
Article 3.1.1 The steel used to manufacture bolted ball joints must meet the design requirements and the technical conditions and standards of the corresponding materials. Inspection method Observation inspection and inspection of factory certificates and test reports. Sampling re-inspection should be carried out in case of doubt.
Article 3.1.2 Bolt balls are strictly prohibited from being overburned, cracked or having hidden dangers. Inspection quantity Randomly inspect 5% of each specification, and no less than 5 pieces. Once cracks are found, they should be inspected one by one.
Inspection method Visual inspection with a 10x magnifying glass or other effective methods such as magnetic particle flaw detection.
Article 3.1.3 The thread size must comply with the provisions of the national standard "Basic dimensions of ordinary threads" GB196-81 coarse thread, and the thread tolerance must comply with the provisions of the national standard "Tolerance and fit of ordinary threads" GB197-81 6H grade accuracy. Inspection quantity Randomly inspect 5% of each specification, and no less than 5 pieces. Inspection method Use standard thread gauge.
Article 3.1.4 The finished ball must be tested for tensile strength of the largest screw hole, and the load when the thread of the screw gun hole is broken is used as the ultimate bearing capacity value of the bolt ball. The bolt is screwed into the depth of 1d (d is the nominal diameter of the bolt) during the inspection. The inspection must comply with the inspection requirements for the bearing capacity of the test piece specified in Appendix 1 of this standard.
Number of inspections
In each project, 600 bolt balls of the same specification with the most unfavorable force are taken as a batch. If there are less than 600, they are still counted as a batch, and 3 balls are taken from each batch as a group for random inspection. Engineering Construction Standard Full Text Information System
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Inspection method Use a tensile testing machine. According to Article 3.2.4, the test is carried out in conjunction with high-strength bolts, and the factory certificate and test report of the product are inspected on site. For the grid structure used in public buildings with a safety level of one and a span of more than 40m, and when there is doubt about the quality, the site must be re-inspected. (I) Allowable Deviation Items
Article 3.1.5 The allowable deviation and inspection method of bolt ball shall comply with the provisions of Table 3.1.5.
Number of Inspections 5% of each specification shall be randomly inspected, and no less than 5 pieces. Allowable Deviation and Inspection Method of Bolt Ball
Ball Hair Diameter
Ball Roundness
Distance between the Bolt Ball Screw Hole End Face and the Ball Center
Parallelism of the Two Screw Hole End Faces on the Same Axis
Angle between the Axis of Two Adjacent Screw Holes
Verticality between the Screw Hole End Face and the Axis
Note: t is the radius of the screw hole end face.
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Fill in allowable deviation
Inspection method
Check with caliper, vernier caliper
Check with vernier caliper, measuring core
rod, height gauge
Check with vernier caliper, height gauge
Check with measuring core rod, height gauge,
Dividing head
Check with dial indicator
.Engineering Construction Standard Full-text Information System
Section 2 High-strength bolts
(I) Guarantee items
Article 3.2.1 The steel used to manufacture high-strength bolts must comply with the design requirements and relevant technical conditions and standards of the corresponding materials. Inspection method Check the factory certificate or test report Article 3.2.2 High-strength bolts must adopt the performance grade 8.8s or 10.9s specified in the national standard "High-strength large hexagon head bolts for steel structures" GB1228-91, and comply with the national standard "Technical conditions for high-strength large hexagon head bolts, large hexagon nuts and washers for steel structures" GB1231-91. The thread should be in accordance with the 6g grade in "Ordinary thread tolerances and fits" GB197-81.
Inspection method Check the factory quality certificate and test report. Article 3.2.3 High-strength bolts must be tested for surface hardness one by one. The hardness of 8.8s high-strength bolts should be HRC21-29; the hardness of 10.9s high-strength bolts should be HRC32-36°. Cracks or damage are strictly prohibited. Inspection method Hardness tester, 10x magnifying glass or magnetic particle inspection. Re-inspect before use. Article 3.2.4 The bearing capacity of high-strength bolts must comply with the allowable value of the tensile strength test coefficient specified in Appendix 1 (). The inspection quantity is 600 bolts per batch of the same specification. If the number is less than 600, it is still counted as a batch. Three bolts are taken as a group in each batch and randomly inspected. The inspection method is to use a tensile testing machine to perform a destructive strength test on the combination of high-strength bolts and bolt balls. On-site inspection of the product factory certificate and test report, if there is any doubt, sampling can be re-inspected.
(I) Allowable deviation items
Article 3.2.5 The allowable deviation and inspection method of high-strength bolts shall comply with the provisions of Table 3.2.5.
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bzsos.com4. The finished balls must be tested for tensile strength on the largest screw hole, and the load when the thread of the screw gun hole is broken is used as the ultimate bearing capacity of the bolt ball. The bolt is screwed into the depth of 1d (d is the nominal diameter of the bolt) during the test. The test must comply with the test requirements for the bearing capacity of the test piece specified in Appendix 1 of this standard.
Number of inspections
In each project, 600 bolt balls of the same specification with the most unfavorable force are taken as a batch. If there are less than 600, they are still counted as a batch, and 3 balls are taken from each batch as a group for random inspection. Engineering Construction Standard Full Text Information System
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Testing method Use a tensile testing machine. Test in conjunction with high-strength bolts in accordance with Article 3.2.4, and check the factory certificate and test report of the product on site. For the grid structure used in public buildings with a safety level of one and a span of more than 40m, and when there is doubt about the quality, the site must be re-inspected. (I) Allowable Deviation Items
Article 3.1.5 The allowable deviation and inspection method of bolt ball shall comply with the provisions of Table 3.1.5.
Number of Inspections 5% of each specification shall be randomly inspected, and no less than 5 pieces. Allowable Deviation and Inspection Method of Bolt Ball
Ball Hair Diameter
Ball Roundness
Distance between the Bolt Ball Screw Hole End Face and the Ball Center
Parallelism of the Two Screw Hole End Faces on the Same Axis
Angle between the Axis of Two Adjacent Screw Holes
Verticality between the Screw Hole End Face and the Axis
Note: t is the radius of the screw hole end face.
Engineering Construction Standard Full-text Information System
Fill in allowable deviation
Inspection method
Check with caliper, vernier caliper
Check with vernier caliper, measuring core
rod, height gauge
Check with vernier caliper, height gauge
Check with measuring core rod, height gauge,
Dividing head
Check with dial indicator
.Engineering Construction Standard Full-text Information System
Section 2 High-strength bolts
(I) Guarantee items
Article 3.2.1 The steel used to manufacture high-strength bolts must comply with the design requirements and relevant technical conditions and standards of the corresponding materials. Inspection method Check the factory certificate or test report Article 3.2.2 High-strength bolts must adopt the performance grade 8.8s or 10.9s specified in the national standard "High-strength large hexagon head bolts for steel structures" GB1228-91, and comply with the national standard "Technical conditions for high-strength large hexagon head bolts, large hexagon nuts and washers for steel structures" GB1231-91. The thread should be in accordance with the 6g grade in "Ordinary thread tolerances and fits" GB197-81.
Inspection method Check the factory quality certificate and test report. Article 3.2.3 High-strength bolts must be tested for surface hardness one by one. The hardness of 8.8s high-strength bolts should be HRC21-29; the hardness of 10.9s high-strength bolts should be HRC32-36°. Cracks or damage are strictly prohibited. Inspection method Hardness tester, 10x magnifying glass or magnetic particle inspection. Re-inspect before use. Article 3.2.4 The bearing capacity of high-strength bolts must comply with the allowable value of the tensile strength test coefficient specified in Appendix 1 (). The inspection quantity is 600 bolts per batch of the same specification. If the number is less than 600, it is still counted as a batch. Three bolts are taken as a group in each batch and randomly inspected. The inspection method is to use a tensile testing machine to perform a destructive strength test on the combination of high-strength bolts and bolt balls. On-site inspection of the product factory certificate and test report, if there is any doubt, sampling can be re-inspected.
(I) Allowable deviation items
Article 3.2.5 The allowable deviation and inspection method of high-strength bolts shall comply with the provisions of Table 3.2.5.
Engineering Construction Standard Full-text Information System
bzsos.com4. The finished balls must be tested for tensile strength on the largest screw hole, and the load when the thread of the screw gun hole is broken is used as the ultimate bearing capacity of the bolt ball. The bolt is screwed into the depth of 1d (d is the nominal diameter of the bolt) during the test. The test must comply with the test requirements for the bearing capacity of the test piece specified in Appendix 1 of this standard.
Number of inspections
In each project, 600 bolt balls of the same specification with the most unfavorable force are taken as a batch. If there are less than 600, they are still counted as a batch, and 3 balls are taken from each batch as a group for random inspection. Engineering Construction Standard Full Text Information System
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Testing method Use a tensile testing machine. Test in conjunction with high-strength bolts in accordance with Article 3.2.4, and check the factory certificate and test report of the product on site. For the grid structure used in public buildings with a safety level of one and a span of more than 40m, and when there is doubt about the quality, the site must be re-inspected. (I) Allowable Deviation Items
Article 3.1.5 The allowable deviation and inspection method of bolt ball shall comply with the provisions of Table 3.1.5.
Number of Inspections 5% of each specification shall be randomly inspected, and no less than 5 pieces. Allowable Deviation and Inspection Method of Bolt Ball
Ball Hair Diameter
Ball Roundness
Distance between the Bolt Ball Screw Hole End Face and the Ball Center
Parallelism of the Two Screw Hole End Faces on the Same Axis
Angle between the Axis of Two Adjacent Screw Holes
Verticality between the Screw Hole End Face and the Axis
Note: t is the radius of the screw hole end face.
Engineering Construction Standard Full-text Information System
Fill in allowable deviation
Inspection method
Check with caliper, vernier caliper
Check with vernier caliper, measuring core
rod, height gauge
Check with vernier caliper, height gauge
Check with measuring core rod, height gauge,
Dividing head
Check with dial indicator
.Engineering Construction Standard Full-text Information System
Section 2 High-strength bolts
(I) Guarantee items
Article 3.2.1 The steel used to manufacture high-strength bolts must comply with the design requirements and relevant technical conditions and standards of the corresponding materials. Inspection method Check the factory certificate or test report Article 3.2.2 High-strength bolts must adopt the performance grade 8.8s or 10.9s specified in the national standard "High-strength large hexagon head bolts for steel structures" GB1228-91, and comply with the national standard "Technical conditions for high-strength large hexagon head bolts, large hexagon nuts and washers for steel structures" GB1231-91. The thread should be in accordance with the 6g grade in "Ordinary thread tolerances and fits" GB197-81.
Inspection method Check the factory quality certificate and test report. Article 3.2.3 High-strength bolts must be tested for surface hardness one by one. The hardness of 8.8s high-strength bolts should be HRC21-29; the hardness of 10.9s high-strength bolts should be HRC32-36°. Cracks or damage are strictly prohibited. Inspection method Hardness tester, 10x magnifying glass or magnetic particle inspection. Re-inspect before use. Article 3.2.4 The bearing capacity of high-strength bolts must comply with the allowable value of the tensile strength test coefficient specified in Appendix 1 (). The inspection quantity is 600 bolts per batch of the same specification. If the number is less than 600, it is still counted as a batch. Three bolts are taken as a group in each batch and randomly inspected. The inspection method is to use a tensile testing machine to perform a destructive strength test on the combination of high-strength bolts and bolt balls. On-site inspection of the product factory certificate and test report, if there is any doubt, sampling can be re-inspected.
(I) Allowable deviation items
Article 3.2.5 The allowable deviation and inspection method of high-strength bolts shall comply with the provisions of Table 3.2.5.
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