GB/T 51253-2017 in English
VALIDStandard for termite damage evaluation of construction project
- Issued on:2017-07-31
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$728.00
| Standard No: | GB/T 51253-2017 |
| Document status: | VALID |
| Title in English: | Standard for termite damage evaluation of construction project |
| Title in Chinese: | 建设工程白蚁危害评定标准 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2017-07-31 |
| Implemented on: | 2018-04-01 |
| Professional Classification: | GB-National Standard |
| Related Topics: | agent hazard
harm sludge hazard construction project Soil sample hazard Hazards of Palladium Carbon ant termite incubation period Tritium hazard carbon hazard The following hazards construction project termite Carbon nine hazards termite mound Cesium Source Hazards sludge hazard factory hazard Tritium Hazard white+ Bromine Hazard Bromine water hazard Cobalt Hazards high altitude hazard its harm GBT51253 GB/T 51253-2017 The dangers of acetonitrile Tris hazards Termite inspection |
Introduction
Analysis of the core content of the standard
| Assessment object | Hazard level | Key indicators | Typical characteristics |
|---|---|---|---|
| Wooden structure house | Level Ⅲ | Hazard ratio ≥30% | Load-bearing components damaged/Holes of white-skinned termites |
| Ancient and famous trees | Level Ⅱ | Tree height＞2m | Live soil termites/Tree trunk not hollowed out |
| Water Conservancy Project | Grade I | Ant nest diameter ≤250mm | Flying holes ≤5 |
Technological evolution and standard background
This standard establishes a three-level quantitative assessment system (Grades I-III) for the first time, breaking through the traditional qualitative description method. With reference to the ISO/TC 23/SC 16 international standard, the following are innovatively introduced:
- Damage ratio calculation formula (P=M/N×100%)
- Multi-building comprehensive grade index model (Formula 4.6.2)
- Special assessment clauses for water conservancy projects for soil-dwelling termites
Implementation points and typical cases
Assessment case of a historical building complex in Hangzhou
For 52 wooden structures, the following were adopted:
- 15m² grid inspection unit division
- Infrared detector assisted positioning
- The damage ratio of scattered termites reached 27%
It was finally assessed as a Grade II regional hazard, and a trapping system was used for prevention and control.
Grading Assessment Operation Guide
Building Assessment Process
- Site Investigation: Certified personnel divide the inspection units according to Article 4.1.3
- Preliminary Assessment: Compare with the corresponding standards of structural types in Articles 4.3-4.5
- Report Preparation: Appendix A contains 7 core contents
Handling of Special Situations
For steel structure buildings: When the proportion of white-termite flying holes is ≥3%, directly determine it to Grade III (Article 4.5.3)
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