This standard specifies the inspection rules and methods for material inspection, process inspection and factory inspection of steel truss structures. This standard applies to the quality inspection rules and methods of steel trusses welded together by angle steel, T-shaped steel, H-shaped steel, channel steel and steel plates for industrial and civil construction. JG 9-1999 Inspection and Acceptance Standard for Steel Trusses JG9-1999 Standard download decompression password: www.bzxz.net

ICS_91.080.10
Construction Industry Standard of the People's Republic of China JG9-1999
Inspection and acceptance standard for steel trusses1999-06-04Promulgated
Promulgated by the Ministry of Construction of the People's Republic of China
Implementation on 1999-06-04
JG9—1999
According to the requirements of the State Administration of Quality and Technical Supervision's "Notice on the Abolition of Professional Standards and National Standards to be Transformed after Cleaning Up and Rectification" (State Administration of Quality and Technical Supervision Standard Letter (1998) No. 216), the Ministry of Construction has cleaned up, rectified and reviewed the national standards approved by the State Administration 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 standard JGJ74.2--91 "Inspection and Acceptance Standard for Steel Trusses" in Document No. 154 of Jianbiao (1999) "Notice on the Announcement of the Results of the Cleaning and Rectification of the Product Standards of the Ministry of Construction", and the new number is JG9-1999. In order to facilitate the implementation of the standard, only the cover, first page, and the above-margin statement of the original standard are modified accordingly, and this explanation is added and reprinted. The original standard version is abolished at the same time. 1
Construction Industry Standard of the People's Republic of China Inspection and Acceptance Standard for Steel Trusses
Inspection and acceptance standard for steel trusses 1 Subject content and scope of application
JG9--1999
1.1 This standard specifies the inspection rules and inspection methods for material inspection, process inspection and factory inspection of steel truss structures 1.2 This standard applies to the quality inspection rules and inspection methods of steel frames welded together by angle steel, T-shaped steel, H-shaped steel, channel steel and steel plates for industrial and civil construction.
Cited standards
GBJ205
GB2106
GB2975
GB4159
GB6397
GB3323
Code for construction and acceptance of steel structure engineering
Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products Chemical analysis method of steel and alloys
Metal tensile test method
Metal bending test method
Metal Charpy (V-notch) impact test method Sampling regulations for mechanical and process performance tests of steels Metal low-temperature Charpy impact test method
Metal tensile test specimen
Radiography and quality grading of steel fusion welded butt joints JGJ74.1
3 Inspection classification
Quality standard of steel trusses
The inspection of steel trusses is divided into material inspection, process inspection and factory inspection. 4 Inspection rules
4.1 During the production process of steel trusses, each process must be self-inspected and mutually inspected, and the quality inspection department must conduct random inspections. After the steel trusses are completed, they must be inspected by the factory quality inspection department. If the quality is qualified, a quality certificate will be issued. 4.2 Batch division
One model of the same product in one project is considered a batch. 4.3 Inspection quantity
4.3.1 Process inspection
4.3.1.1 The templates and sample rods used for cutting must be inspected piece by piece, and 100% qualification is required. At least the first and last pieces of the same model of cutting parts must be inspected. The inspection department will randomly inspect, and the quantity must not be less than 5%. 4.3.1.2 The appearance (including size) inspection of assembly and weld quality should be carried out piece by piece. 4.3.2 Factory Inspection
Approved by the Ministry of Construction of the People's Republic of China on June 4, 1999 and implemented on June 4, 1999
JG9—1999
4.3.2.1 Before delivery, steel trusses shall be assembled for trial, with the number of trial assemblies not less than 3. 4.3.2.2 All steel trusses shall be inspected before delivery. 5 Inspection Methods
5.1 Materials
5.1.1 Structural Steel
5.1.1.1 The variety, model, specification and quality of steel shall comply with the requirements of the design documents and the provisions of JGJ74.1. The test items, sampling quantity and test methods of steel are shown in Table 1. Table 1 Test methods for steel products
Test items
Chemical analysis
Room temperature shock
Low temperature shock
5.1.1.2 Test methods
Sampling quantitywwW.bzxz.Net
(Each batch of steel products)
(Each batch of steel products)
(Each batch of steel products)
(Each batch of steel products)
Sampling method
GB2975
Check the factory certificate and test report of steel products. Steel specifications can be measured with a steel ruler or caliper. Test methods
GB2106
GB4159
Surface defects and delamination of steel products can be observed by eye, measured with a ruler, and, if necessary, a penetration test or ultrasonic flaw detection can be performed. 5.1.2 Connection materials
5.1.2.1 Welding rods, welding flux, welding wire and shielding gas used for welding shall comply with the requirements of the design documents and relevant national regulations, and shall comply with the provisions of JGJ74.1.
The material, type, specification, etc. of high-strength bolts and ordinary bolts shall comply with the requirements of the design documents and shall comply with the provisions of JGJ74.1. 5.1.2.2 Inspection method
Check the factory certificate of welding rods, welding wires, welding flux, high-strength bolts, ordinary bolts, etc., and check the baking records and packaging of welding rods, welding flux, etc.
5.1.3 Anti-corrosion materials
5.1.3.1 The primer and topcoat used for structural components shall comply with the requirements of the design documents and shall comply with the provisions of JGJ74.1. 5.1.3.2 Inspection method
Check the paint brand and factory quality certificate. 5.2 Process Inspection
5.2.1 Cutting and Correction
5.2.1.1 Cutting and correction of steel materials shall comply with the requirements of JGJ74.1. 5.2.1.2 Inspection Method
Observe and measure with a ruler. For cracks and delamination at the fracture of steel materials, use magnetic particle penetration test and ultrasonic flaw detection if necessary, and check the operation records.
5.2.2 Assembly
JG9-1999
5.2.2.1 The assembly of steel trusses shall comply with the provisions of JGJ74.1. 5.2.2.2 Inspection Method
a. Check the welding operation certificate of the workers who locate the welding points. b. Check that the welding rods used for the tack welding points should be the same as those used for formal welding. C. Check the limit deviation during assembly. It is necessary to measure with a steel ruler and caliper and check with a feeler gauge. 5.2.3 Welding
5.2.3.1 The quality requirements for welds shall comply with the provisions of JGJ74.1. 5.2.3.2 Inspection methods
8. Check the examination certificates of welders and non-destructive inspection personnel, and check the qualification certificates and examination dates of the corresponding welding conditions of the welders.
b. In addition to the appearance inspection, non-destructive inspection is required for the first and second level welds. All first level welds shall be inspected by ultrasonic inspection and 2% of the weld length shall be inspected by X-ray. At least one negative film shall be used for the radiographic inspection. If the defects exceed the standard, two more points nearby shall be selected for inspection. If there are still defects exceeding the standard, the weld must be fully transilluminated. For second level welds, 50% of the weld length shall be inspected by ultrasonic inspection. The length of each inspection point shall not be less than 300mm. If the inspection fails, two more points nearby shall be selected for inspection. If there are still defects exceeding the standard, the weld shall be fully inspected by ultrasonic inspection. c. The appearance quality of the weld should be observed by eye, the height of the weld should be checked with a gauge, the length of the weld should be checked with a steel ruler, and circular defects and cracks can be re-tested with magnetic particles.
5.2.4 Hole making
5.2.4.1 The quality standards of high-strength bolt holes and ordinary bolt holes shall comply with the provisions of JGJ74.1. 5.2.4.2 Inspection method
a. Check by marking method, assembling mold frames or using special templates. b. The holes on the plate stack should be checked with a gauge, and the inspection method should comply with the provisions of GBJ205. 5.2.5 Friction surface
5.2.5.1 The quality requirements of the friction surface for high-strength bolt connection should comply with the provisions of JGJ74.1. 5.2.5.2 Inspection method
Test the limit load of anti-slip failure on the tensile machine with the same material and the same treatment method, and calculate the anti-slip coefficient by the following formula:
Where: F is the measured limit load of anti-slip: ng is the number of friction surfaces;
n·Ept
Zpt is the sum of the actual measured values ​​of the corresponding high-strength bolt tightening pre-tension when the specimen is sliding. 5.2.6 Rust removal and painting
5.2.6.1 The quality requirements for rust removal and painting of steel frames shall comply with the provisions of JGJ74.1. 5.2.6.2 Inspection method
a. Check whether the rust removal is thorough by eye.
b. Check whether the paint brand meets the design requirements and the factory certificate of conformity. c. Observe whether the paint film is smooth and uniform, and use a thickness gauge to check the thickness of the paint film. 5.3 Factory inspection
After the steel truss is completed, check the shape and geometric dimensions of the finished steel truss according to the requirements of JGJ74.1. The inspection method shall be carried out in accordance with the provisions of Table 2.
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