DL/T 5024-2020 in English
VALIDTechnical code for ground treatment of electric power engineering
- Issued on:2020-10-23
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 10 business days
$4,462.00
| Standard No: | DL/T 5024-2020 |
| Document status: | VALID |
| Title in English: | Technical code for ground treatment of electric power engineering |
| Title in Chinese: | 电力工程地基处理技术规程 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 10 business days |
| Issued on: | 2020-10-23 |
| Implemented on: | 2021-02-01 |
| Superseding: |
DL/T 5024-2005 Ground treatment Technical Code of Fossil Fuel Power Plant
|
| Professional Classification: | DL-Electricity |
| Related Keywords: | key technical points
technical code edition update points treatment methods standard revision technical elements ground treatment |
| Related Topics: | dl/t5024
dl/t 5024-2005 Technology assists engineering Ground Treatment Technology Power Engineering foundation Technical specification for electric power engineering cable survey Technical specifications for foundation treatment jgj792012 dl/t5572-2020 dl/t 5584-2020 dl/t2131-2020 |
Introduction
Core changes in the standard revision
| Technical elements | 2005 edition | 2020 edition | Update points |
|---|---|---|---|
| Treatment methods | 8 categories | 12 categories | Four new processes including vacuum-surcharge combined preloading and CFG piles |
| Chapter structure | Mixed arrangement | Four-stage standardization | Uniformly reconstructed according to "general provisions-design-construction-inspection" |
| Testing requirements | Appendix scattered | Independent chapter | New chapter 14.6 Inspection and monitoring |
Analysis of key technical points
1. Vacuum-loading combined preloading method
Article 5.2.4 of the regulations clearly states: The vacuum pressure should be maintained at 80kPa or above, the loading capacity should be determined by calculation, and the superposition time of the two should not be less than 30 days. Engineering applications show that this method can reduce the moisture content of soft soil by 15-25%.
2. Cement fly ash gravel pile (CFG pile)
Chapter 9 stipulates that the pile strength should be ≥C15, the pile diameter should be 400-600mm, and the pile spacing should be controlled to 3-5 times the pile diameter. A converter station project in East China adopted this process, and the foundation bearing capacity was increased from 120kPa to 280kPa.
3. High-pressure jetting method is an independent chapter
The jetting process, which was originally a grouting method, is now listed in a separate chapter 11, clarifying the construction parameters of the triple tube method: water pressure ≥35MPa, slurry pressure ≥20MPa, and the lifting speed is controlled to 5-15cm/min.
Implementation suggestions
- Process selection matrix:
Geological conditions Recommended process Bearing capacity improvement Soft soil foundation Vacuum-loading combined preloading 150-250% Fill foundation Dynamic compaction method 200-300% - Key points for quality control: The original body test must include 3 groups of comparative tests, and the detection frequency is increased by 30%
- Environmental protection measures: Cement mixing method construction must be equipped with dust recovery device
Standard application cases
This standard is applied in a ±800kV UHV converter station project:
- CFG piles are used for composite foundation treatment at a depth of 18m
- After 150 days of vacuum-loading combined preloading, the settlement was reduced from the estimated 450mm to 210mm
- The pile spacing was optimized through prototype testing, saving 12% of project cost
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