This standard specifies the technical requirements, inspection rules, test methods, packaging, marking, transportation and storage requirements during the manufacturing process of transmission line towers. This standard applies to the manufacture of transmission line towers, power microwave towers, communication towers and similar steel structures whose components are mainly made of steel and fasteners, and hot-dip galvanized for corrosion protection. GB/T 2694-2003 Technical conditions for the manufacture of transmission line towers GB/T2694-2003 standard download decompression password: www.bzxz.net

ICS 29.240.01
National Standard of the People's Republic of China
GB/T2694—2003
Replaces GB2694--1981
Technical reguirements for manufacturingTransmission line tower-
Technical reguirements for manufacturing2003-04-14Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on 2003-12-01
Normative reference documents
Technical requirements
Inspection rules
6 Packaging, marking, transportation and storage
Appendix A (Normative Appendix)
Hot-dip galvanizing layer uniformity test
Hot-dip galvanizing layer uniformity test Galvanized layer adhesion test
Appendix B (normative appendix)
Copper sulfate test methodbzxZ.net
Drop hammer test method
Appendix C (normative appendix)
Hot-dip galvanized layer thickness test method Metal coating thickness instrument test method Appendix D (normative appendix)
Appendix E (normative appendix)
Hot-dip galvanized layer adhesion test method Dissolution weighing test method Hot-dip galvanized layer adhesion and uniformity test sample sampling method GB/T 2694--2003
GB/T2694-2003
This standard is based on the revision of the national standard plan project formulated by the former State Bureau of Technical Supervision in 1995, and revises GB2694--1981 "Technical Conditions for the Manufacture of Transmission Line Towers". The content of this standard adapts to the development of the tower manufacturing industry and the progress of processing technology, and adapts to international trade, technology and economic exchanges. This standard is a revision of GB2694-1981, with the following major revisions: a) Adjustment, addition and subtraction of some items and tolerances; The welding part is revised according to the provisions of GB50205-2001 "Code for Acceptance of Construction Quality of Steel Structure Engineering"; h)
c) Added the provisions of fasteners;
d) Modified the inspection rules;
e) Added Appendix A (Normative Appendix);
f) Added Appendix E (Normative Appendix).
This standard replaces GB2694-1981 from the date of implementation. Appendix A, Appendix B, Appendix C, Appendix D and Appendix E of this standard are all normative appendices. This standard was proposed by the former Ministry of Electric Power.
This standard is under the jurisdiction of the Power Transmission and Transformation Equipment Branch of the China Electricity Council. The drafting units of this standard: Anshan Tower Manufacturing General Factory, Tower Quality Inspection and Testing Center of the Ministry of Electric Power Industry, and Anshan Tower Development and Research Center. The main drafters of this standard are Zhang Xianfeng, Li Changyue, Li Jinchun, Qi Jinming, Zhang Xinbo, Yang Yanguo, Wang Limin and Tang Xingmei. This standard was first issued on January 1, 1981. 1 Scope
Technical conditions for the manufacture of transmission line towers
GB/T2694—2003
This standard specifies the technical requirements, inspection rules, test methods and packaging, marking, transportation and storage requirements in the manufacturing process of transmission line towers.
This standard is applicable to the manufacture of transmission line towers, power microwave towers, communication towers and similar steel structures whose components are mainly made of angle steel and fasteners, and hot-dip galvanized for corrosion protection.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB/T470 Zinc ingots
GB/T3098.1 Mechanical properties of fasteners Bolts, screws and studs GB/T3098.2 Mechanical properties of fasteners Nuts Coarse pitch threads GB3323 Radiography and quality grading of steel fusion welded butt joints GB11345 Manual ultrasonic flaw detection methods and grading of flaw detection results for steel welds GB/T13912 Technical requirements for hot-dip galvanizing of metal coverings Steel products GB50205--2001 Code for acceptance of steel structure construction quality 3 General
3.1 The manufacture of steel towers shall be carried out in accordance with the requirements of this standard and design drawings, and shall comply with the provisions of GB50205 and the provisions of relevant national standards in force.
3.2 When the design needs to be modified, the consent of the original design unit should be obtained and the design change document should be signed. 3.3 The materials should meet the requirements of the current national standards and design drawings, and should have a factory quality certificate. 3.4 Surface quality of steel: There should be no cracks, folds, scars, inclusions and heavy skin on the surface; when there are rust, pits and scratches on the surface, the depth should not be greater than 1/2 of the negative allowable deviation value of the steel thickness, and the cumulative error should be within the negative allowable deviation. 4 Technical requirements
4.1 Cutting
4.1.1 After the steel is cut, there should be no cracks and edge defects greater than 1.0mm on the fracture. The flatness of the cut surface at the cut is 0.05t (t is the thickness) and not more than 2.0mm, the depth of the cut is not more than 0.3mm, and the allowable deviation of the local notch depth is 1.0mm. 4.1.2 The allowable deviation of cutting shall be in accordance with the provisions of Table 1. 4.2 Marking
4.2.1 Parts shall be marked by stamping with steel characters in the order of engineering code (if necessary), tower type, and part number. 4.2.2 The stamps of the markings shall be arranged neatly and the characters shall not have defects. The height of the characters shall be 8mm to 18mm, and the depth of the stamp shall be 0.5mm to 1.0mm. The surface of the steel near the stamp shall not have concave or convex defects, and shall not have cracks or gaps on the edges. 4.2.3 The stamps of welded parts shall not be covered. 1
GB/T2694—2003
Length L or width B
Verticality P of cut surface
4.3 Bending
Verticality P of angle steel end
Allowable deviation of cutting
Allowable deviation
≤t/8
and not more than 3. 0
≤36/100
and not more than 3. 0
Unit: mm
4.3.1 After the parts are bent, their edges should have a smooth transition, and there should be no obvious wrinkles, concave surfaces and damage on the surface. The scratch depth should not be greater than 0.5mm
The allowable deviation of bending shall be as specified in Table 2.
Table 2 Allowable deviation for bending
Displacement of bending point (line) S
Joint angle steel, regardless of the limb width
b≤50
50b≤100
1006≤200
Allowable deviation
5L/1000
1.5L/1000
7L/1000
5L/1000
3L/1000
Note 1: After the part is bent, the thinnest part of the angle steel edge shall not be less than 70% of the original thickness. Note 2: 6 is the limb width of the angle steel.
4.4 Hole
Unit: mm
There shall be no obvious concave defects on the punching surface, and burrs larger than 0.3mm shall be removed. The allowable deviation of hole making shall be in accordance with the provisions of Table 3 2
Roundness Dm--D
Hole verticality S
Multiple rows of holes
Joints
Row distance:
Distance between two non-adjacent holes in the same group St
Distance between two adjacent holes in the same group S2
Distance between two holes in an adjacent group S3
Distance between two holes in a non-adjacent group S
End distance and edge distance Sa
Cut edge distance S
Note 1: Deviations of serial numbers 1 and 2 are not allowed to exist at the same time. Table 3 Allowable deviation of hole making
Allowable deviation
And ≤2.0
Note 2: The position measurement of punching holes shall be carried out on the plane where the minor diameter is located. 4.5 Root cleaning, back shoveling and beveling
The allowable deviation of root cleaning, back shoveling and beveling shall be in accordance with the provisions of Table 4. S
GB/T2694—2003
Unit: mm
GB/T 2694—2003
Welding assembly
10
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.