GB/T 25020.3-2016 in English
SUPERSEDEDSteel pole for pole for overhead contact system of electrified railways--Part 3: Steel tube pole
- Issued on:2016-12-13
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 25020.3-2016电气化铁路接触网钢支柱 第3部分：环形钢管支柱》由347（国家铁路局）归口，TC278SC3（全国轨道交通电气设备与系统标准化技术委员会牵引供电分会）执行，主管部门为国家铁路局。
Introduction
Analysis of the core content of the standard
This standard specifies the technical requirements for the full life cycle of annular steel pipe pillars for electrified railway contact networks, covering a complete specification system from raw material selection to transportation and storage. The 2016 version mainly revised the inspection moment parameters and added a mandatory requirement of ≤25mm for the guide height deflection.
Evolution of key technologies
| Technical indicators | 2010 version | 2016 version | Change range |
|---|---|---|---|
| Standard test bending moment | Calculated according to the old wind pressure | Adjust the structural design wind speed | Maximum +12% |
| Limit of high deflection | Not specified | ≤25mm(MW1) | Newly added |
| Vertical test method | Simply supported beam type | Improved load distribution | Accuracy improved by 30% |
Detailed explanation of key performance indicators
Structural bearing capacity
Steel pipe pillars need to pass the three-level bending moment test:
- Standard test bending moment (Mk): Verify the foundation bearing capacity under the design wind speed
- Column top deflection test (Ms): Control the deformation under the operating wind speed ≤1.5L/100
- Bearing capacity test (1.5Mk): Ensure that no plastic deformation occurs in the limit state
Anti-corrosion system requirements
Use hot-dip galvanizing + fluorocarbon coating for double protection:
- Zinc layer thickness: ≥65μm when wall thickness is <5mm, ≥86μm when ≥5mm
- Coating adhesion: pull-off method ≥5.9MPa or cross-cut method ≤level 2
- Weather resistance: no cracking or falling off after 4000h artificial aging
Implementation and application suggestions
Key points for selection and design
Select the pillar specifications corresponding to the test bending moment according to the line wind speed level, and pay special attention to:
- Anchor pillars need to calculate additional anchoring bending moment
- Urban rail transit can be used as a reference but the wind vibration coefficient needs to be verified
On-site inspection specifications
The vertical test should strictly follow the six-step loading procedure:
- Pre-add 50% Mk to eliminate installation gap
- Graded loading to MW1 and MW2
- Verification of column top deflection
- Bearing capacity limit test
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