This standard is a supplementary regulation for drawing and dimensioning. It is mainly used for simplified representation of bars, profiles and their cross-sections in assembly drawings and detailed drawings. The scope also includes: - Metal components composed of bars, profiles and their assemblies (including: bridges, frames, pile foundations, etc.); - Lifting and transportation equipment; - Liquid storage tanks and pressure vessels; - Lifts, elevators, conveyor belts, etc. GB/T 4656.1-2000 Technical drawing simplified representation of bars, profiles and their cross-sections GB/T4656.1-2000 standard download decompression password: www.bzxz.net

GB/T4656.1—2000
This standard is compiled based on ISO5261, 1995 "Simplified representation of bars, profiles and their sections in technical drawings" and is equivalent to the international standard in terms of technical content.
This revised standard replaces Chapter 5 "Marking of bars, profiles and plates" and Chapter 7 "Simplified representation" in GB/T4656-1984 "Representation of metal structures" to make the representation of bars, profiles and their sections consistent with international standards to meet the needs of international trade, technology and economic exchanges.
This standard was proposed by the State Machinery Industry Bureau. This standard is under the jurisdiction of the National Technical Committee for Standardization of Technical Product Documents (CSBTS/TC146). The drafting units of this standard are: Mechanical Science Research Institute, Shaanxi Province Standard Metrology Information Institute, China Institute of Atomic Energy. The main drafters of this standard are: Yang Dongbai, Hou Weiya, Qiang Yi, Zhang Xiangyang, Huang Ju. GB/T4656.1—2000
ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standardization bodies (ISO member bodies). The work of formulating international standards is usually completed by the technical committees of SO. If each member body is interested in a project established by a technical committee, it has the right to participate in the work of the committee. International organizations (official or unofficial) that maintain contact with ISO can also participate in the relevant work. In the field of electrotechnical standardization, ISO maintains a close cooperative relationship with the International Electrotechnical Commission (EC). The draft international standard adopted by the technical committee is submitted to the member bodies for voting. It must obtain the consent of at least 75% of the participating member bodies before it can be officially published as an international standard. ISO5261 is under the responsibility of Technical Committee ISO/TC10. The second edition of ISO5261, ISO5845-1:1995, replaced
ISo5261:1981.
1 Scope
National Standard of the People's Republic of China
Technical drawingswwW.bzxz.Net
Simplified representation of bars, profiles and their sectionsTechnical drawings-Simplified representation of bars and profile sectionsGB/T4656.1—2000
idtIso5261.1995
Partially replaces GB/T4656—1984
This standard is a supplementary provision for drawing methods and dimensioning methods. It is mainly used for simplified representation of bars, profiles and their sections in assembly drawings and detailed drawings. The scope also includes:
Metal components composed of bars, profiles and their combined components (including: bridges, frames, pile foundations, etc.); a lifting and transportation equipment;
-Liquid storage tanks and pressure vessels;
-Lifts, elevators, conveyor belts, etc.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T9787-1988 Size, shape, weight and tolerance of hot-rolled equal-leg angle steel GB/T10609.2-1989 Technical drawing details column (neqISO7573:1983) GB/T13361-1992 General terminology for technical drawing GB/T17450-1998 Technical drawing
Line (idtISo128-20:1996)
3 Definition
For the terms involved in this standard, see GB/T13361. 4 Simplified representation of bars, profiles and their sections
Bars, profiles and their sections are represented by corresponding marks (see Table 1 and Table 2), and each parameter is separated by a short stroke. If necessary, the cutting length can be noted after the mark. This mark can also be filled in the details column (see GB/T10609.2)sss
Cutting length
Necessary size
Standard code
Graphic symbol
Approved by the State Administration of Quality and Technical Supervision on 2000-07-24 and implemented on 2000-12-01
Bar section
Circular tube
Hollow square tube
Flat rectangle
Hollow rectangular tube
Hexagon
Hollow hexagonal tube
Triangle
Semicircle
GB/T4656.1—2000
Graphic symbol
Necessary size
b·h ·t
T-shaped steel
I-shaped steel
Z-shaped steel
Ball angle steel
Ball flat steel
Marking examples:
Graphic symbol
GB/T4656.1—2000
Letter code
Example 1: Angle steel, size is 50mm×50mm×4mm, length is 1000mm, marked as LGB/T9787-50×50X4-1000
Characteristic size
When there is a corresponding standard but it will not cause misunderstanding or the marking of bars and profiles is not specified in the corresponding standard, the graphic symbols specified in Tables 1 and 2 plus the necessary dimensions and their cutting lengths can be used for simplified representation. Example 2: Flat steel, size is 50mm×10mm, length is 100mm, simplified mark is: 50×10-100
For simplification, uppercase letter codes can also be used to replace the graphic symbols of the profiles specified in Table 2. Example 3: Angle steel, size is 90mm×56mm×7mm, length is 500mm, simplified mark is: L90×56×7-500
L90×56×7-500
The mark should be marked as close to the corresponding component as possible (Figure 1 to Figure 3). The mark on the figure should be consistent with the position of the steel section (Figure 3). 3
5 Simple diagram representation of metal components
GB/T4656.1—2000
Metal components can be represented by simple diagrams drawn with thick solid lines. At this time, the distance value between nodes should be marked according to the method of Figure 4. The size of metal components allows closed dimensions to be marked. When cumulative error is to be considered, the closed loop size shall be specified. 6XCBM16X45
1.70X7-3500
U200×25-1583
-50×10-100
100X10- 56-[0)
983R1890
[10×130×130
10×300×6:0
GB/T4656.1—2000
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