YD/T 757-2013 PDF in English
YD/T 757-2013 (YD/T757-2013, YDT 757-2013, YDT757-2013)
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Technical specifications for communication towers of angle steel
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| YD/T 757-1995 | English | 599 |
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Technical conditions of microwave towers
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Standards related to (historical): YD/T 757-2013
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YD/T 757-2013: PDF in English (YDT 757-2013) YD/T 757-2013
YD
COMMUNICATION INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 33.060.99
CCS M 34
Replacing YD/T 757-1995
Technical specifications for
communication towers of angle steel
Issued on April 25, 2013 Implemented on June 01, 2013
Issued by. Ministry of Industry and Information Technology
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 General provisions ... 5
4 Materials ... 5
5 Technical requirements ... 6
6 Inspection rules ... 17
7 Packaging and marking ... 18
8 Storage and transportation ... 19
Annex A... 20
Annex B... 21
Annex C... 23
Annex D... 25
Foreword
This Standard is prepared according to the rules provided in GB/T 1.1-2009 “Directives for
standardization - Part 1. Structure and Drafting of Standards”.
This Standard replaces YD/T 757-1995 “Technical Specifications of Microwave Tower”.
Compared with YD/T757-1995, the main revisions are as follows.
1. Add the scope of application. Communication towers of steel angle and similar steel
structure;
2. Update the reference standards;
3. Add provisions on materials;
4. Design section is revised in accordance with the new norms;
5. Add contents on zinc coating restoration;
6. Add stipulations on trial assembly;
7. Revise marking, packaging and transportation section;
8. Revise inspection rules.
This Standard was proposed by and under the jurisdiction of China Communications
Standards Association.
Drafting organization of this Standard. Hebei ZhongYi Communications Technology
Engineering Co., Ltd.
Main drafters of this Standard. Liang Shuchen, Tang Haitao, Hou Donghong, Duan Yunhui,
Ji Pingping, Zhao Zhigang, Wang Menghao, Wang Xiumin, Ren Wuzhu, Zhang Xuebin and
Li Xiaomin.
This Standard was first published on June 28, 1995.
Technical Specifications for
Communication Towers of Angle Steel
1 Scope
This Standard specifies technical requirements for manufacturing, inspection rules,
package marking, storage and transportation, etc. of communication towers of angle steel.
This Standard applies to the design and manufacturing of mobile communication tower,
microwave communication tower and other communication towers that are mainly made
of angle steel, connected through fasteners, and adopt hot-dip galvanization for corrosion
resistance as well as similar steel structure.
2 Normative references
The following documents are indispensable for application of this document. For the dated
documents so quoted, only the dated versions apply to this document. For the undated
documents so quoted, the latest versions (including all modification sheets) apply to this
document.
GB 50009-2001 Load code for the design of building structures
GB 50205-2001 Code for Acceptance of Construction quality of Steel Structures
GB/T 41 Hexagon nuts - Product grade C
GB/T 709 Dimension shape weight and tolerances for hot-rolled steel plates and sheets
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1. Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (Apply
to inspection of process stability)
GB/T 3098.1 Mechanical properties of fasteners. Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners – Nuts - Coarse thread
GB/T 3323 Methods for radiographic inspection and classification of radiographs for
fusion welded butt joints in steel
GB/T 11345 Method for manual ultrasonic testing and classification of testing results for
ferritic steel welds
GB/T 13912 Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel
articles - Specifications and test methods
YD 5098-2005 Specifications of Engineering Design for Lightning Protection and
Earthing Design for Telecommunication Bureaus (Stations)
3 General provisions
3.1 The organization that manufactures the communication towers shall have
corresponding qualifications.
3.2 Design and manufacture of communication towers shall comply with relevant
provisions of this Standard; where it is not covered by this Standard, relevant national and
industry standards shall prevail.
3.3 Manufacture of communication towers shall comply with the requirements of drawings;
when the design has to be changed, it shall be approved by design organization, and the
design organization provides the design changes.
3.4 When new technologies, new processes and new materials are adopted, it is better to
evaluate the conformity to safe-use requirements through verification.
3.5 Communication tower manufacturing process shall comply with the requirements of
relevant national security, environmental and occupational health regulations.
4 Materials
4.1 Steel
4.1.1 Steel varieties, specifications, performances, etc. shall comply with existing national
product standard and design requirements and there shall be quality conformity certificate;
there shall be spot check before use of steel. Quality of imported steel shall comply with
design and the requirements of standard specified in contract.
4.1.2 When the design has no special requirements, allowable thickness deviation of hot
rolled steel plate shall comply with the provisions on deviation of class N in GB/T 709.
4.1.3 Steel surface quality. The surface shall be free of cracks, folds, scars, inclusions and
cold-lap; for corrosion, pitting and scratches on surface, the depth may not be 1/2 greater
than negative allowable thickness deviation of the steel, and the accumulated error is within
negative allowable deviation range.
4.1.4 Steel splicing shall be approved by design organization.
4.2 Welding material
4.2.1 Varieties, specifications, performances, etc. of welding materials shall comply with
existing national product standard and design requirements; there shall have quality
conformity certificate.
4.2.2 Welding rod coating shall not fall off; welding core shall not get rusty; welding wire
surface shall be smooth and free of burrs, rusting, oxide skin and other defects that have
adverse effect on welding performance.
4.3 Fasteners
4.3.1 Varieties, specifications and grades of bolts, nuts, gaskets, turnbuckles, steel
stranded wire, wire rope clip, shackle and other connecting pieces and fasteners and
anticorrosion form shall meet design requirements; there shall have quality conformity
certificate.
4.3.2 Mechanical properties of bolts and nuts shall be able to meet the provisions of GB/T
3098.1 and GB/T 3098.2.
4.3.3 Galvanized layer thickness of fasteners shall meet design requirements and the
provisions of GB/T 13912.
4.3.4 Other requirements for fasteners are based on existing relevant national standard.
5 Technical requirements
5.1 Design
5.1.1 Design reference period of communication tower structure is 50 years; design
working life is generally 50 years; security of structure is of level two; earthquake
fortification of microwave tower shall not be lower than class B; earthquake fortification of
mobile communication tower shall not be lower than class C. For any special requirements,
construction party and design organization negotiate to determine according to relevant
standard.
5.1.2 Calculation of wind load that communication tower structure bears shall follow the
provisions of existing national standard GB 50009 “Load Code for the Design of Building
Structures (Version 2006)”; designed reference wind pressure is based on a fifty-year
return period and reference wind pressure may not be less than 0.35 kN/m2.
5.1.3 Tower top shall fitted with lightning rod and other air termination to ensure that
antennas and other communication equipment are within the scope of protection and
comply with relevant provisions in YD 5098-2005 “Specifications of Engineering Design for
Lightning Protection and Earthing Design for Telecommunication Bureaus (Stations)”.
5.1.4 Tower top is better fitted with aviation obstruction light, the setting of which shall
comply with the requirements stipulated by civil aviation and other relevant departments.
5.1.5 Measures are better taken for burglary prevention of fasteners that are at tower
bottom segment and less than 2m height.
5.1.6 Tower body is better equipped with ladder; feeder lines are set on both sides of ladder
for fixation of beam to meet the laying and installation of all feeder lines.
5.1.7 For model selection of microwave tower plane, quadrilateral tower is better adopted...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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