This standard specifies the factory inspection, type inspection and product acceptance of steel grid structure products. This standard applies to the quality inspection and acceptance of steel grid structure products. JG 12-1999 Steel Grid Inspection and Acceptance Standard JG12-1999 Standard download decompression password: www.bzxz.net

ICS 91. 080.10
Industry Standard of the Construction Industry of the People's Republic of China JG 12—1999
Inspection and acceptance standard for steel space grid structures
Published on 1999-06-04
Published by the Ministry of Construction of the People's Republic of China
Implemented on 1999-06-04
Industry Standard of the Construction Industry of the People's Republic of China
Inspection and acceptance standard for steel space grid structures
JG12—1999
Published by China Standards Press
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Printed by China Standards Press Qinhuangdao Printing Factory Xinhua Bookstore Beijing Distribution Office Distributed
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Format 880×12301/16
Printing sheet 1/2
Word count 8,000 words
First printing in April 2001
First edition in April 2001
Print runs 1-1000
Book number: 155066·2-13663
Price 6.00 yuan
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Subjects 566-511
Copyright reserved
Infringements must be investigated
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JG 121999
According to the requirements of the State Bureau of Quality and Technical Supervision's "Notice on the Abolition of Professional Standards and National Standards to be Transformed after Rectification" (No. 216 of the Bureau of Quality and Technical Supervision, 1998), the Ministry of Construction has cleaned up, rectified and reviewed the national standards approved by the State Bureau of Technical Supervision in 1992 for the Ministry of Construction to be converted into industry standards and the product standards approved and issued by the Ministry of Construction before 1992. The Ministry of Construction confirmed and issued the JGJ75.3-91 "Steel Grid Inspection and Acceptance Standard" standard with the document "Notice on the Announcement of the Results of the Rectification of the Ministry of Construction's Product Standards" (No. 154 of the Ministry of Construction, 1999), and the new number is JG12-1999. In order to facilitate the implementation of the standard, only the cover, first page and the above-the-headline expressions of the original standard are modified accordingly, and this explanation is added and reprinted, and the original standard version is abolished at the same time. Inspection and acceptance standard for steel space grid structures
This standard is used in conjunction with JG10 and JG11. 1 Subject content and scope of application
This standard specifies the factory inspection, type inspection and product acceptance of steel space grid structure products. This standard applies to the quality inspection and acceptance of steel space grid structure products. 2 Reference standards
GB2828
Batch inspection counting sampling procedures and sampling tables Code for construction and acceptance of steel structure projects
GBI2054
3 Inspection rules
3.1 Inspection classification
Product inspection is divided into factory inspection and type inspection. 3.2 Inspection items
JG12-1999
It is divided into two types: main inspection items and general inspection items. The main inspection items are listed in Table 1. Except for those listed in Table 1, all other items in the technical requirements of JGJ75.1 and JGJ75.2 are general inspection items. Table 1
Main inspection items①
Product name
Bolt ball
High-strength bolt
Sealing plate or cone head
Welded hollow ball
Note: ①Items with "△" in the table indicate items to be inspected
Distance between vertical plane and center
Adjacent angle
Weld flaw detection
Wall thickness reduction
②For welded hollow ball, it refers to the hemisphere groove, the sealing plate or cone head refers to the groove at the welding with the steel pipe, and the rod refers to the groove at the end of the steel pipe. Approved by the Ministry of Construction of the People's Republic of China on June 4, 1999
Initial bending of steel pipes
Implemented on June 4, 1999
3.3 Factory inspection
3.3.1 Factory inspection is carried out according to the main inspection items in Table 1. JG12—1999
3.3.2 The sample size and qualified and unqualified judgment of each sampling are listed in Table 2 according to the normal inspection secondary sampling plan of GB2828. 3.3.3 Performance inspection is carried out according to the requirements of product drawings or the contract between the supply and demand parties, and the sample size and qualified and unqualified judgment of each sampling are listed in Table 3.
3.3.4 Samples of parts should be randomly selected from the batch submitted for inspection. The inspection batch can be a batch of products of the same model for delivery acceptance, but each batch shall not be less than 150 pieces. For the same type of products produced continuously, the manufacturer's technical inspection department may inspect them in batches, but each batch shall not exceed 35,000 pieces.
When using the secondary sampling plan, each sample should be drawn from the entire batch, and the time of drawing the sample can be during the formation of the batch or after the formation of the batch.
Inspection items
Main inspection items
General inspection items
Inspection level
General inspection
Level 1
General inspection
Level 1
Qualified quality level
Batch range
151~280
281500
501~1200
1201~3200
3201~10000
10001~35000
151~~ 280
281~500
501～1200
1201~3200
3201~10000
10001~35000
Sample size
Number of qualified judgments
Number of unqualified judgments
Inspection items
Inspection level
Performance inspection Special inspection
Level S-4
Destructive test》
3.3.5 Judgment rules
Qualified quality level
JG 12—1999
Batch Range
91~150
151~280
281~500
5011200
1201~3200
3201~10000
Sample Size
Qualified Number
Unqualified Number
According to the sample inspection results, if the number of unqualified products found in the first sample is less than or equal to the first qualified number, the batch is judged to be a qualified batch. If the number of unqualified products found in the first sample is greater than or equal to the first unqualified number, the batch is judged to be an unqualified batch. If the number of unqualified products found in the first sample is greater than the first qualified number and less than the first unqualified number, the second sample is drawn for inspection. If the sum of the number of unqualified products found in the first and second samples is less than or equal to the second qualified judgment number, the batch is judged to be a qualified batch. If the sum of the number of unqualified products found in the first and second samples is greater than or equal to the second unqualified judgment number, the batch is judged to be an unqualified batch.
Products that are judged to be a qualified batch based on the inspection results of the first sample and meet the high-quality product standards in the technical requirements are judged to be excellent products. 3.3.6 Welding parts judged to be unqualified products are only allowed to be repaired once. The repaired products are inspected one by one according to the specified standards. If the inspections all meet the standard requirements, their quality can only be judged as qualified products. 3.3.7 Inspection level and qualified quality level If the purchaser has special requirements, the supplier may require the corresponding level of inspection to be increased according to the contract provisions agreed by both parties.
3.4 ​​Type inspection
3.4.1 Type inspection should be carried out in any of the following situations: a. Trial design and identification of new products;
b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c. During normal production, periodic inspection should be carried out after a certain amount of production (up to 35,000 pieces); d. When the product is resumed after one year of suspension; e. When the national quality supervision agency proposes a requirement for type inspection. 3.4.2 The items of type inspection shall be all items (including main inspection items and general inspection items) in accordance with the technical requirements specified in JGJ75.1 and JGJ75.2.
3.4.3 The sampling rules for performance inspection (i.e. destructive test) shall be carried out in accordance with Table 3. 3.4.4 The samples for type inspection shall be randomly sampled from the batch products. When there is no batch product, random sampling shall be carried out during the trial production, but the samples for destructive test shall not be less than 3 pieces.
3.4.5 The samples of parts and components used for performance inspection shall be randomly sampled from the batch products. 4 Product Acceptance
JG121999
4.1 The product can be accepted after passing the factory inspection in Article 3 of this standard. 4.2 When the product leaves the factory, the manufacturer shall submit the following technical documents: a. Certificates and test reports of various parts and components; b. Design change documents;
c. Quality certificates or retest reports of the steel and other materials used; d. Weld quality and high-strength bolt quality inspection data; e. List of shipped parts and components.
Additional Notes: bzxz.net
This standard was proposed by the Standard and Norms Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the China Building Standard Design Institute. This standard was drafted by the China Building Standard Design Institute (chief editor), Xuzhou Feihong Grid Company, and Shanxi Fenyang Building Metal Structure Industry Company.
The main drafters of this standard are Zhang Yuntian, Zhang Ximing, Zheng Changxing, Zhong Xianhua, Zhang Yongan, Wang Yuzhao, and Liu Xilin. This standard is entrusted to the China Building Standard Design Institute for interpretation. Copyright is exclusive and infringement is subject to investigation
Book number: 155066·2-13663
Pricing:
Subjects 566—511
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