DL/T 5178-2016 in English
VALIDTechnical Spection for Concrete Dam Safety Monitoring
- Issued on:2016-02-05
- Implemented on:2016-07-01
- File Format:PDF
- Delivery:Via email within 10 business days
Price(USD)：
$1,800.00
$1,746.00
$1,746.00
Introduction
Key points of the revision of the specification
| Revision direction | 2003 version | New content of the 2016 version |
|---|---|---|
| Monitoring technology | Traditional measurement methods | Newly added GNSS network design, sliding micrometer application |
| Instrument standards | Dispersed regulations | Unified inspection and calibration methods and calculation formulas |
| Special monitoring | Partial requirements | Explicitly cite DL/T 5416 and other 5 special standards |
Monitoring system design principles
According to Article 3.0.1, the monitoring design of concrete dams must follow the "four synchronization" principles:
- Monitoring connection between construction period and operation period
- Compatibility of manual monitoring and automation system
- Redundant arrangement of key parts (such as ≥3 sets of crown beam measuring points)
- Instant re-testing mechanism for abnormal data
Comparison of typical monitoring schemes
| Dam type | Horizontal displacement monitoring | Seepage monitoring focus | Joint monitoring requirements |
|---|---|---|---|
| Gravity dam | Vertical line + tension line combination | Dam foundation drainage corridor | Transverse joint spacing ≤20m |
| Arch dam | GNSS+vertical line network | Arch seat replacement concrete area | Must be set up in the middle of the irrigation area |
Implementation points
Key indicators of instrument installation
- Inverted hole Effective aperture ≥75mm (Article 6.3.2)
- Tension line Height difference tolerance ±3mm (Article 6.3.3)
- Vacuum laser system leakage rate <120Pa/h (Article 6.3.5)
Data collection specifications
Manual observation must meet the following requirements:
- Vertical line/tension line backlash ≤0.15mm
- Leveling measurement closure error ≤0.3√n mm
- GNSS static measurement reaches Class B accuracy
Special monitoring requirements
Slope monitoring near the dam
According to Article 6.2.13:
- The spacing between the main monitoring sections is ≤100m
- Synchronous acquisition of three-dimensional coordinates of surface displacement points
- For deep deformation, sliding micrometers are preferred
Inspection standards
According to Chapter 4:
- Once a day during the first water storage period
- ≥ once a month during the operation period
- Annual inspectionIncluding special inspections during the freezing period
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