Some standard content:
National Standard of the People's Republic of China
Steel tube scaffold couplers
Steel tube scaffold couplersGB 15831-1995
This standard refers to the international standard ISO4054-1980 "Requirements and inspection procedures for steel tube scaffolding, butt pins and base plates". 1 Subject content and scope of application
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of steel tube scaffold couplers. This standard applies to couplers made of malleable cast iron or cast steel used in steel tube scaffolding, derricks, formwork supports, etc. with an outer diameter of 48mm in construction projects. It is also applicable to couplers required in municipal, water conservancy, chemical, metallurgical, coal and shipbuilding projects. Couplers with an outer diameter of 51mm for steel tubes can also be implemented in accordance with this standard.
Referenced standards
Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches)GR 2828
Carbon structural steel
Basic dimensions of common threads (diameter 1~～600mm)Semi-round head rivets
Flat washers Grade C
GB 9440
GB11352
Forgeable iron castingsbzxZ.net
Casting carbon steel parts for general engineering
Welded steel pipes for low-pressure fluid transportation
GB/T 3092
3 Symbols
A1: displacement value of the horizontal pipe;
△: displacement value of the fastener cover plate on the vertical pipe; P: load;
Q: rotation angle;
f: displacement value of the torsional stiffness test;
△: displacement value of the tensile test.
4 Classification
Fasteners are divided into right-angle fasteners, rotating fasteners and butt fasteners. 4.1 See Table 1 for fastener and base types.
Approved by the State Administration of Technical Supervision on December 14, 1995 180
Implementation on August 1, 1996
GB15831-1995
4.2. The fastener model consists of the fastener code, fastener type, main parameters and update or variant code. Model description is as follows:
4.3 Marking example
Right angle fastener
KZ$48A
Right angle fastener
Base KDZ48A
5 Technical requirements
GB15831-1995
Variant code. Expressed by ABC
Main parameters: Scaffolding steel pipe outer diameter, $48
Type code: Z right angle; U one rotation ;D-- docking;DZ-- base fastener code: K
GB15831-1995
GB15831-1995
5.1 Fasteners must be produced in accordance with the drawings approved in accordance with the prescribed procedures. 5.2 The material of the fastener casting should be made of forgeable cast iron with mechanical properties not less than KTH330-08 specified in GB9440 or ZG230-450 cast steel specified in GB11352. 5.3 The fitting surface of the fastener and the steel pipe must be strictly shaped to ensure the anti-slip and tensile properties of the fastener. 5.4 The mechanical properties of the fastener and the base should meet the requirements of Table 2. Table 2
Performance name
Anti-destruction
Torsional stiffness
Fastener type
When P=7.0kN, A≤7.0mmWhen P=10.0kN, Az≤0.5mmWhen P=7.0kN, 4, ≤7.0mm,When P=10.0kN, z≤0.5mmWhen P=25.0 kN, no part shall be damaged
When P=17.0kN, no part shall be damaged
When the torque is 900N·m, ≤4°
When P=4.0 kN, 4≤2.0 mm
When P=50.0kN, no part shall be damaged
5.5 Fasteners (except the base) must undergo a 65N·m torque pressure test and damage is not allowed. 5.6 Appearance and accessories quality requirements
5.6.1 No cracks are allowed in any part of the fastener. 5.6.2 The opening distance between the cover plate and the seat shall not be less than 49 (52) mm. 5.6.3 The fastener is not allowed to have shrinkage in the main parts. 5.6.4 There shall be no more than three sand holes larger than 10mm2 on the surface of the fastener, and the cumulative area shall not be larger than 50mm. 5.6.5 The cumulative area of sand adhesion on the surface of the fastener shall not be larger than 150mm2. 5.6.6 The misalignment shall not be larger than 1mm.
5.6.7 The height (or depth) of the convex (or concave) on the surface of the fastener shall not be larger than 1mm. 5.6.8 There shall be no oxide scale at the contact part between the fastener and the steel pipe, and the cumulative oxidation area of other parts shall not be larger than 150mm2. Rivets shall comply with the provisions of GB867, the riveted joints shall be firm, the rivet joints shall be larger than the rivet hole diameter by 1mm, and they shall be beautiful, and there shall be no cracks5.6.9
.
GB15831-1995
5.6.10 The materials used for T-bolts, nuts, washers and rivets shall comply with the relevant provisions of GB700. The threads of bolts and nuts shall comply with the provisions of GB196, and washers shall comply with the provisions of GB95. T-bolt M12, total length 72±0.5mm, nut width across flats 22±0.5mm, thickness 14±0.5mm.
The threads of T-bolts and nuts shall be checked with grade 3 precision ring gauges and plug gauges. 5.6.11 The movable parts shall be able to rotate flexibly, and the clearance between the two rotating surfaces of the rotating fastener shall be less than 1mm. 5.6.12 The specifications and trademarks of the products shall be cast in a conspicuous place, and the handwriting and patterns shall be clear and complete. , 5.6.13 The surface of the fastener shall be treated with anti-rust treatment (bituminous paint cannot be used), the paint shall be uniform and beautiful, and there shall be no piled paint or exposed iron. 5.6.14 Right-angle fasteners, rotating fasteners and butt fasteners must comply with the requirements of 5.6.1~5.6.3, and meet the seven appearance items in 5.6.4~~5.6.13 to be qualified; the base must meet the requirements of 5.6.1 and 5.6.3, and meet the four appearance items in 5.6.4~5.6.8 and 5.6.12 and 5.6.13 to be qualified.
6 Test method
6.1 Test conditions and instruments
6.1.1 The test shall use a steel pipe with an outer diameter of 48mm and a wall thickness of 3.5mm in GB3092. The surface shall be coated with a uniform layer of red lead paint, and the test shall be carried out after the paint is dry. For each test, the fastener shall be moved to a fastening position. 6.1.2 The accuracy of the hydraulic universal material testing machine and dial indicator used in the test is ±1%, the accuracy of the snake used in the torsional stiffness test device is ±2%, and the accuracy of the fixed-force torque wrench is ±5%. 6.1.3 The T-bolts, nuts and washers of the fasteners used in the test must be unused and qualified products. 6.1.4 During the test, the openings between the cover plate and the seat of the right-angle fasteners and rotating fasteners on the cross tube must face upward. 6.1.5 During the fastener test, the torque of the tightening bolts must be 40N·m. 6.1.6 When the fasteners are subjected to various load tests, the loading speed should be controlled between 300 and 400N/s. 6.1.7 The total load in the test should include the preload. 6.2 Mechanical properties test of right-angle fasteners
6.2.1 Anti-slip performance test
When the fasteners are subjected to the anti-slip performance test, a vertical load P that increases at a uniform rate is applied to the cross tube (on both sides of the fastener). When P reaches the specified value, the displacement value A and △ are measured (see Figure 1).
1-horizontal tube: 2-vertical tube, 3-fastener
When the preload P is 1kN, adjust the displacement measuring instrument to zero. When P increases to 7kN, record the △, value: when P increases to 10 kN, record the △2 value.
Both arc surfaces of the fastener should be tested. 6.2.2 Anti-destruction performance test
GB15831—1995
After the anti-slip performance test, the undamaged fastener can be used for anti-destruction performance test. At this time, an anti-slip support pad should be attached to the lower part of the fastener (see Figure 2). When P is 25kN, all parts must not be damaged. Only one arc surface is tested.
1-horizontal tube, 2-vertical tube, 3-support pad; 4-fastener 6.2.3 Torsional stiffness performance test
The fastener is installed on two mutually perpendicular steel pipes. If the length of the horizontal tube is more than 2000mm, load P on the horizontal tube at a distance of 1000mm from the center, and measure the rotation angle 6 or displacement value f of the horizontal tube at a distance of 1000mm from the center at the unloaded end (see Figure 3). 1000
1—Horizontal tube; 2—Vertical tube; 3—Fasteners
When the preload P is 20N, adjust the measuring instrument to zero, and then add load in steps of 100N until 900N. The measured value should be recorded immediately at each load level, and the displacement values should be converted into rotation angles after the test. 6.3 Mechanical property test of rotating fasteners
6.3.1 Anti-slip performance test
The test method is the same as 6.2.1, except that the preload P is 0.2kN and P=7.When P=0kN, record the △ value, when P=10.0kN, record the △A2 value. Only one arc surface is tested.
6.3.2 Anti-destruction performance test
GB 15831-1995
After the anti-sliding performance test, the anti-destruction performance test is carried out. When the load is 17kN, the parts of the fastener shall not be damaged. 6.4 Butt fastener tensile performance test
The fastener is subjected to axial tension increasing at a constant speed, and the displacement value △ is measured (see Figure 4). When the preload P is 1kN, adjust the measuring instrument to zero, and then continue to load. When P increases to 4kN. Record the △ value. Figure 4
1-Steel pipe; 2-Fastener, 3-Measuring tool
6.5 Base compression performance test
Load evenly at a speed of 1kN/s. When P is 50kN, the base shall not be damaged (see Figure 5). P
1-Steel pipe; 2-Base
7 Inspection rules
7.1 Inspection classification
The inspection of fasteners is divided into factory inspection and type inspection. 7.1.1 Factory inspection The quality inspection department of the manufacturer shall conduct appearance and accessory inspection according to Article 5.6, and torque pressure test according to Article 5.5. The product shall be allowed to leave the factory only after passing the inspection and issuing the product factory certificate. 7.1.2 Type inspection includes appearance inspection and mechanical property inspection. Type inspection should be carried out in any of the following situations: trial production and verification of new products or old products transferred to the factory for production; a
b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance; during normal production, at least one inspection is conducted for a cumulative total of 300,000 pieces or three months; c.
When the product is suspended for a long time and production is resumed; d.
GB15831—1995
When the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. If the type inspection fails, the product will be stopped from acceptance and shipment, and the manufacturer will take effective measures until the type inspection passes before the inspection can be resumed. 7.2 The appearance, accessories and mechanical properties of the product shall be inspected in accordance with the relevant provisions of the technical requirements in Chapter 5. 7.3 Sampling method
7.3.1 Product inspection shall be carried out in accordance with the secondary normal inspection sampling plan specified in GB2828 (see Table 3). Table 3
Item category
Main items
General items
Inspection items
Anti-slip performance
Anti-destruction performance
Torsional stiffness performance
Tensile performance
Compressive performance
Inspection level
7.3.2 Random sampling is adopted for inspected products.
7.3.3 Batch range for acceptance
7.3.3.1 Each batch of fasteners must be greater than 280 pieces. AQL
Batch Range
281~500
501～1200
120110000
281~500
501～~1200
1201~10000
7.3.3.2 When the batch exceeds 10,000 pieces, the excess shall be inspected in another batch. 7.4 Judgment Method
7.4.1 Single product shall comply with the relevant provisions in Chapter 5. 7.4.2 Batch products shall be judged according to Table 3. 7.4.3 The mechanical properties, appearance and accessories of the product shall be qualified before it can be called qualified. 7.5 For products that are not accepted after inspection, the manufacturer is allowed to repair them and then submit them for acceptance. 8 Marking, packaging, transportation and storage
8.1 Marking
The product marking shall be set on the product certificate and shall indicate: a. manufacturer name; b. trademark;
product model:
d. quantity.
8.2 Packaging
Sample size
GB15831-1995
Fasteners shall be packaged by classification and tied firmly. The weight of each bag (box) shall not exceed 30kg. Each package shall have a product certificate, which shall be marked with a.
mark;
license number:
date of issuance;
inspector's stamp.
8.3 Transportation
Various transportation methods can be adopted according to user requirements. 8.4 Storage
Products shall be stored in a rust-proof and moisture-proof manner.
Additional Notes:
This standard was proposed by the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the Ministry of Construction's Construction Engineering Standards and Technology Management Unit. This standard was drafted by the China Academy of Building Research's Building Mechanization Research Institute, with participation from Beijing Malleable Steel Plant, Shandong Province Zhaoyuan City Malleable Steel Plant, Hefei Malleable Steel Plant, and China Construction Machinery Corporation. The main drafters of this standard are Shen Yingying, Chen Wenlong, Zhu Enxi, Ou Jizhong, Fan Zhuguo, Lian Chenghu, Wang Feng, and Zhang Xinming. This standard is entrusted to the China Academy of Building Research's Building Mechanization Research Institute for interpretation. From the date of implementation of this standard, the JGJ22-85 "Steel Tube Scaffolding Fasteners" standard will be invalid. 1872 Packaging
Sample size
GB15831-1995
Fasteners shall be packaged by categories and tied firmly. The weight of each bag (box) shall not exceed 30kg. Each bag shall have a product certificate, which shall be marked with a.
mark;
license number:
date of issuance;
mark of inspector.
8.3 Transportation
Various transportation methods can be adopted according to user requirements. 8.4 Storage
Products shall be stored in a rust-proof and moisture-proof manner.
Additional remarks:
This standard was proposed by the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the Ministry of Construction's construction engineering standard technology unit. This standard was drafted by the Building Mechanization Research Institute of the China Academy of Building Research, and Beijing Malleable Steel Factory, Shandong Zhaoyuan Malleable Steel Factory, Hefei Malleable Steel Factory, and China Construction Machinery Corporation participated in the drafting. The main drafters of this standard are Shen Yingying, Chen Wenlong, Zhu Enxi, Ou Jizhong, Fan Zhuguo, Lian Chenghu, Wang Feng and Zhang Xinming. The Institute of Building Mechanization of China Academy of Building Research is responsible for the interpretation of this standard. From the date of implementation of this standard, the standard JGJ22-85 "Steel Tube Scaffolding Fasteners" will be invalid.2 Packaging
Sample size
GB15831-1995
Fasteners shall be packaged by categories and tied firmly. The weight of each bag (box) shall not exceed 30kg. Each bag shall have a product certificate, which shall be marked with a.
mark;
license number:
date of issuance;
mark of inspector.
8.3 Transportation
Various transportation methods can be adopted according to user requirements. 8.4 Storage
Products shall be stored in a rust-proof and moisture-proof manner.
Additional remarks:
This standard was proposed by the Ministry of Construction of the People's Republic of China. This standard is under the jurisdiction of the Ministry of Construction's construction engineering standard technology unit. This standard was drafted by the Building Mechanization Research Institute of the China Academy of Building Research, and Beijing Malleable Steel Factory, Shandong Zhaoyuan Malleable Steel Factory, Hefei Malleable Steel Factory, and China Construction Machinery Corporation participated in the drafting. The main drafters of this standard are Shen Yingying, Chen Wenlong, Zhu Enxi, Ou Jizhong, Fan Zhuguo, Lian Chenghu, Wang Feng and Zhang Xinming. The Institute of Building Mechanization of China Academy of Building Research is responsible for the interpretation of this standard. From the date of implementation of this standard, the standard JGJ22-85 "Steel Tube Scaffolding Fasteners" will be invalid.
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