GB/T 51295-2018 in English
VALIDTechnical standard of steel cofferdam engineering
- Issued on:2018-04-25
- Implemented on:2018-12-01
- File Format:PDF
- Delivery:Via email within 10 business days
$2,251.00
| Standard No: | GB/T 51295-2018 |
| Document status: | VALID |
| Title in English: | Technical standard of steel cofferdam engineering |
| Title in Chinese: | 钢围堰工程技术标准 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 10 business days |
| Issued on: | 2018-04-25 |
| Implemented on: | 2018-12-01 |
| Professional Classification: | GB-National Standard |
| Related Keywords: | steel cofferdam projects
steel cofferdam engineering introduction core technical standards foot steel pipe pile cofferdam ≤15m internal support steel box cofferdam ≤40m cofferdam depth |
| Related Topics: | weir
around cod standard range cod standard range Steel cofferdam engineering technology GBT51295 GB/T 51295-2018 cofferdam Steel sheet pile cofferdam technology for water conservancy and hydropower projects Steel cofferdam technology Design and construction technology of double-wall steel cofferdam Molded bag sand cofferdam gb/t 51295-2018 |
本标准适用于钢围堰工程的设计、施工、监测及质量验收。2018-12-1实施。
Introduction
Core Technical Standards for Steel Cofferdam Projects
According to the requirements of Document No. 189 of Jianbiao (2014), this standard is applicable to steel cofferdam projects with a water depth of less than 15m and a safety level of 1-3. The main contents include:
| Cofferdam type | Applicable water depth | Velocity limit | Typical structure |
|---|---|---|---|
| Steel sheet pile cofferdam | ≤10m | <2m/s | Interlocking pile + internal support |
| Steel box cofferdam | ≤40m | >2m/s | Double wall structure + blade foot |
| Steel pipe pile cofferdam | ≤15m | <2m/s | Lock connection + purlin |
Key technical requirements
Safety level division:According to the cofferdam depth, the importance of the main project and other indicators, it is divided into three levels, among which the first-level cofferdam requires an anti-overturning safety factor ≥1.35.
Anti-corrosion design:The underwater part should use Q355 or higher steel, the bottom concrete strength should be ≥C25, and a 50μm anti-corrosion coating should be added to the splash zone.
Key indicators for stability verification
Six types of stability verification must be carried out:
- Overall sliding (arc method)
- Anti-uplift (foundation bearing capacity method)
- Anti-soil flow/piping (hydraulic gradient method)
- Anti-overturning (moment balance method)
- Anti-floating (Archimedes principle)
- Erosion stability (flow velocity verification)
Key points for construction quality control
Steel sheet pile construction:
- Error in closing width ≤3cm
- Vertical deviation ≤1% of pile length
- Lock-mouth water-stopping uses butter + sawdust composite caulking
Monitoring requirements:
- Displacement warning value: first-level cofferdam ≤ 0.3%H (H is the excavation depth)
- Spacing between support axial force monitoring points ≤ 20m
- Monitoring frequency during flood season ≥ 2 times/day
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