GB/T 37439-2019 in English
VALIDPrecast post-tensioned prestressed concrete simply-supported beam of high-speed railway
- Issued on:2019-05-10
- Implemented on:2019-12-01
- File Format:PDF
- Delivery:Within 1 day
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| Standard No: | GB/T 37439-2019 |
| Document status: | VALID |
| Title in English: | Precast post-tensioned prestressed concrete simply-supported beam of high-speed railway |
| Title in Chinese: | 高速铁路预制后张法预应力混凝土简支梁 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Within 1 day |
| Issued on: | 2019-05-10 |
| Implemented on: | 2019-12-01 |
| ICS Classification: | 45.040-Materials and components for railway engineering |
| Chinese Classification: | S05-Materials |
| Professional Classification: | GB-National Standard |
| Related Keywords: | precast post-tensioned prestressed concrete
high-speed railway introduction analysis high-speed railway project concrete simply-supported beam high-speed railways |
| Related Topics: | simply supported beam
Charpy beam astm astm simply supported beam Charpy beam standard iso Charpy beam Zhang Fa high speed rail Prestressed Concrete Prestressed Concrete Prestressed China Railway China Railway front and back tension GBT37439 GBT 37439-2019 gb/t37439-2019 gbt37439-2019 |
《GB/T 37439-2019高速铁路预制后张法预应力混凝土简支梁》由347（国家铁路局）归口，主管部门为国家铁路局。
Introduction
Analysis of the core content of the standard
This standard systematically specifies the technical requirements for the full life cycle of precast post-tensioned prestressed concrete simply supported beams for high-speed railways:
| Technical links | Key indicators | Testing methods |
|---|---|---|
| Raw material control | Cement alkali content ≤0.6%, C3A ≤8% | GB/T176 |
| Concrete performance | Electric flux ≤1000C, frost resistance ≥300 cycles | GB/T50082 |
| Prestressed construction | Elongation deviation ≤±6%, wire breakage rate ≤0.5% | TB/T2092 |
Key points of technical innovation
Case:A high-speed railway project adopted the vacuum assisted grouting process specified in this standard, and the grout performance reached:
- 3h capillary water seepage rate <0.1%
- 28d compressive strength ≥50MPa
- Filling degree qualified rate 100%
Implementation suggestions
- Material management:Establish a raw material traceability system to ensure that each batch of cement and steel strands can be traced
- Process control: Adopt an automated tensioning system, and the pressure gauge accuracy shall not be less than Class 1.0
- Quality acceptance: Protective layer thickness detection points for box beams ≥ 600 points, and T beams ≥ 200 points
Standard evolution analysis
Main improvements compared to the old version of the standard:
- Added real-time monitoring requirements for pipeline grouting
- Strengthen alkali-aggregate reaction prevention and control measures
- Refine temperature difference control indicators (core ≤ 65℃)
Sample only — not a preview of GB/T 37439-2019
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