QX/T 231-2014 in English
VALIDTechnical speciticaHon for lightning protection of ancient and rare trees
- Issued on:2014-07-25
- Implemented on:2014-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$224.00
| Standard No: | QX/T 231-2014 |
| Document status: | VALID |
| Title in English: | Technical speciticaHon for lightning protection of ancient and rare trees |
| Title in Chinese: | 古树名木防雷技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2014-07-25 |
| Implemented on: | 2014-12-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | lightning protection system
ancient trees ancient trees age lijiang ancient town protection project national lightning disaster prevention industry standardization technical committee |
| Related Topics: | tree elasticity
QX Ancient and famous trees Lightning protection engineering technology for ancient buildings |
Introduction
Standard Background and Significance
This standard was proposed by the National Lightning Disaster Prevention Industry Standardization Technical Committee and formulated for the special protection object of ancient and famous trees. With the advancement of ecological civilization construction, the protection needs of ancient trees over 100 years old and famous trees with historical and cultural values are becoming increasingly prominent. Statistics show that lightning strikes have become the second largest natural factor leading to the death of ancient trees.
Definition of core terms
| Terms | Definition | Key technical points |
|---|---|---|
| Ancient trees | Age ≥ 100 years | The impact of annual ring growth on the fixing device needs to be considered |
| Lightning protection system (LPS) | Lightning terminal + down conductor + grounding device | Impact grounding resistance ≤ 30Ω |
| Lightning terminal | Lightning terminal rod/belt/wire/net | Above the tree canopy ≥ 1.0m |
Key technical requirements
1. Specifications for lightning arrester installation
When using non-metallic clamps for fixing, the following must be met:
- Width ≥ 40mm and thickness ≥ 4mm
- Width of lining flexible material > clamp width
- No less than 3 fixing points
2. Key points for down conductor installation
Yunnan case: In the Lijiang Ancient Town protection project, multi-core copper stranded wires (cross-sectional area ≥ 50mm²) were laid along tree trunks and protected by 100kV insulating sleeves, which effectively solved the safety protection problem in crowded places in tourist areas.
3. Special treatment of grounding device
When the root system is on the soil surface:
- Horizontal grounding electrode needs to be insulated
- The buried position should be ≥3m away from the tree crown projection
- Ring grounding electrode is preferred
Implementation suggestions
Maintenance and management requirements
| Project | Period | Inspection content |
|---|---|---|
| Regular inspection | Half a year | Loose and rusty connections |
| Inspection after thunderstorm | Immediately | Traces of lightning damage |
| Resistance detection | Annual inspection | Impact grounding resistance value |
Special requirements for cultural relics protection
For ancient trees in scenic areas:
- Insulating sleeves shall be installed for the section below 2.7m of the down conductor
- Warning signs in Chinese and English shall be set up
- Guardrail height ≥ 0.8m and non-metallic material shall be used
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