This standard applies to parallel bars for gymnastics competitions and general practice. GB 8391-1987 Parallel bars GB8391-1987 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Parallel barsWww.bzxZ.net
This standard applies to parallel bars for gymnastics competition and ordinary practice. This standard refers to the international standard ISO378--1980 "Parallel bars" 1 Product classification
1.1 The types of parallel bars can be divided into the following according to their usage: a. Competition parallel bars;
b. Ordinary practice parallel bars.
1.2 The basic size parameters shall comply with the provisions of Table 1 and Figure 1. Table 1
Bar height H
Bar length L
Bar section
is oval
Inner distance between two bars S
Longitudinal column center distance S
Vertical axis lifting distance
Movement area
Upper barrel part
Upper edge of base
Base thickness dmx
Horizontal width of base Bx
Not less than
Not less than
Basic size Inch
Competition type
Limit deviation
1300~1850
Short diameter 41
Long diameter 51
420~520
Approved by the Ministry of Light Industry of the People's Republic of China on December 10, 1987±5
UDC685.64
GB8391—87
Ordinary practice type
Basic size
1400～1 700
Short diameter 41
Long diameter 51
390~630
Limit deviation
1988-06-01 implementation
1.3 Main raw materials
GB8391
Sports area
Bar surface: Made of laminated reinforced wood (at least wooden surface) or any other hygroscopic material with the same function of wood (impact strength, moisture absorption, neutral to magnesium oxide). Column foot, support and bar: Made of steel or cast iron. Anti-slip material: rubber or similar material (for competition type). No marks or scratches should be left on the floor. 2 Technical requirements
2.1 The basic size parameters of the parallel bars are specified in Table 1 and Figure 1. 2.2 The technical indicators shall comply with the provisions of Table 2.
3 Test method
Indicator name
Elastic force of bar surface
Straightness of bar surface
Corrosion resistance of electroplating layer
Surface quality
Stability of base
GB8391—87
Competition type
Static load of bar surface is 1350N,
Deflection is within the range of 54-66mm,
Residual deformation after canceling external force shall not exceed 1mm
The deflection difference between the two bars shall not exceed 2mm
Deviation shall not exceed 3mm
Corrosion resistance level is above 7 levels
a. Uniform thickness, no hard edges;
Ordinary practice type
Static load of bar surface is 1350N,
No cracks or breaks. Cancel external force
Residual deformation does not exceed 3mm
Deviation does not exceed 8mm
Corrosion resistance level 5 or above
a. Uniform thickness and no hard edges. At both ends of the bar surface 1.5m away from the middle section, the diameter is not more than 8mm. b. No cracks, no scars, no decay,
c. The color of the spray paint or baking paint is uniform and consistent, without active tree knots, and no more than 3 bubbles, wrinkles and dirty spots on one bar.
b. The paint color is consistent, without paint streaks, dirty spots and exposed bottom. Stable
Flexible use of matching parts, strong and durable
3.1 Specifications and dimensions are measured with a vernier caliper, steel tape measure or special ruler with the same indication error. 3.2 Elastic force of the bar surface
a. For the competition type, the bar surface is placed on two fulcrums 2300mm apart (see Figure 2). The height of the bar surface (the distance from the ground to the top of the bar surface) should be 1750mm. A static load of 1350N is applied at the midpoint. The measured deflection of the bar surface should be within the range of 54~~~66mm. The residual deformation of the bar surface after the external force is removed should not exceed 1mm.
For the ordinary practice type, the bar surface is placed on two fulcrums 2300mm apart. A static load of 1350N is applied at the midpoint. The bar surface should not be cracked or broken by visual inspection.
The residual deformation of the bar surface after the external force is removed should not exceed 3mm. 3.3 Straightness of the bar surface: The bar surface is placed on two fulcrums 2300mm apart. A thin rope is fixed axially and a heavy object is hung at the other end to make the thin rope taut and straight. The trueness of the bar surface is measured as shown in Figure 3 and should meet the requirements of Table 2. 3.4 Anti-corrosion of electroplating layer
Test for 24 hours according to GB5938 "Neutral Salt Spray Test (NSS) Method for Corrosion Resistance of Metal Coatings and Chemically Treated Coatings of Light Industrial Products", and make ratings according to GB5944 "Evaluation of Corrosion Test Results of Metal Coatings of Light Industrial Products". 3.5 Surface quality: Visual inspection or comparison inspection based on actual samples. 3.6 Stability and fit of base
Stability of base and fit of base, riser, locking cap, bar support, etc., visual inspection by hand feel. 55
GB8391—87
Tensile attenuation
Competition type: Stability of base To measure, adjust the parallel bars to a height of 1750mm, fix a rope of 2300±15mm on each of the two bar supports at either end, apply a horizontal force of 900N on the rope, and the base of the parallel bars should not be lifted (see Figure 4). 900N
4 Inspection rules
4.1 The inspection of batch products is divided into batch inspection and periodic inspection. 4.2 Batch inspection
4.2.1 Batch inspection shall be in accordance with the one-time sampling plan of general inspection level ⅡI in GB2828 "Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)".
4.2.2 The items and clauses of batch inspection, test method clauses and AQL values ​​shall be in accordance with the provisions of Table 3. 56
Basic size parameters
Elastic force of bar surface
Straightness of bar surface
Surface quality
Stability of base
4.3 Periodic inspection
Clause of this standard
GB8391—87
Clause of test method
Competition type
Ordinary practice type
4.3.1 The samples for periodic inspection must be randomly selected from the qualified samples in batch inspection and all of them shall be inspected according to the batch inspection items. If unqualified products are found, they shall be replaced with qualified products. 4.3.2 Periodic inspection shall be carried out every six months and shall also be carried out when the design, key process, main raw materials are changed or when production is resumed after suspension for more than three months.
4.3.3 Periodic inspections shall be carried out in accordance with the provisions of the single sampling scheme of the discrimination level [I, judgment array (12) in GB2829 "Periodic Inspection Counting Sampling Procedure and Sampling Table (Applicable to the Inspection of Stability of Production Process)". 4.3.4 The items and clauses of periodic inspections, test method clauses and their RQL values ​​shall be in accordance with the provisions of Table 4. Table 4
Corrosion resistance of electroplating layer
Marking, packaging, transportation, storage
Clause of this standard
Test method clause
5.1 Marking: The product shall have a trademark, factory name, certificate of conformity, product manual, and date of manufacture. 5.2 Packaging: Select packaging materials to protect the product according to different conditions in each region. Competition type
5.3 Transportation: The product shall not be exposed to rain, sun, or moisture during transportation. It shall be handled with care and shall not be squeezed or collided. 5.4 Storage: The warehouse shall be ventilated and dry (products shall not be stored in the open air) and properly kept. Additional Notes:
RQL, %
Ordinary Practice Type
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is under the jurisdiction of the National Cultural and Sports Goods Standardization and Quality Inspection Center. This standard was drafted by Shanghai Cultural and Educational Goods Industry Research Institute, Tianjin Chunhe Sports Goods Factory, Shanghai Sports Equipment Factory No. 1, Guangzhou Dongfang Sports Equipment Factory, Beijing Sports Equipment Factory, and Chengdu Sports Equipment Factory. 57
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