JT/T 496-2018 in English
VALIDHigh-density polyethylene silicore duct for highway underground communication conduit
- Issued on:2018-08-29
- Implemented on:2018-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$485.00
| Standard No: | JT/T 496-2018 |
| Document status: | VALID |
| Title in English: | High-density polyethylene silicore duct for highway underground communication conduit |
| Title in Chinese: | 公路地下通信管道高密度聚乙烯硅芯塑料管 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2018-08-29 |
| Implemented on: | 2018-12-01 |
| Superseding: |
JT/T 496-2004 High-density polyethylene silicon duct for highway communication conduct
|
| Professional Classification: | JT-Transport |
| Related Keywords: | underground communication conduit introduction core changes
color strip silicon core tube high-density polyethylene silicore duct added normative appendix f test procedures key instrument requirements silicon core tube |
| Related Topics: | Underground Line + Company
high density plastic pipe Pipe Density Meter Core core high throughput High-density polyethylene jt/t 1180.21-2018 jt/t1187-2018 Low Density and High Density Plastics JT/T 1180.6-2018 silicon core |
本标准规定了公路地下通信管道高密度聚乙烯硅芯塑料管的产品结构、分类与标记、技术要求、试验方法、检验规则，以及标志、包装、运输和储存等要求。
本标准适用于公路地下通信高密度聚乙烯硅芯塑料管的生产、检验和使用，多孔组合高密度聚乙烯塑料管道可参照使用。
本标准不适用于室外直接暴露于太阳光下的通信光、电缆用保护管。
Introduction
Core changes in the standard revision
| Revision content | 2004 edition | 2018 edition | Technical significance |
|---|---|---|---|
| Product structure | Single tube only | Newly added cluster tube (J type) | Adapt to the needs of porous combined pipes |
| Specifications and models | 7 types | Newly added 12/9, 16/13 micro tubes, a total of 14 types | Expanded application scenarios |
| Friction coefficient | No requirement for test bar hardness | Clear Shore hardness (59±3) HD | Improve test accuracy |
Analysis of key technical indicators
Physical and chemical performance requirements
- Static friction coefficient: ≤0.25 (plate method test)
- Ring stiffness: ≥40kN/m² (to ensure compressive strength)
- Environmental stress cracking resistance: 48h failure rate ≤20%
- Recovery rate: ≥85% after 10 minutes of compression of 50%
Structural feature requirements
The outer tube and micro tube of the cluster tube must meet the independent and non-contact principle, the outer color should comply with the color spectrum requirements of GB/T 6995.2, and the color strip silicon core tube needs to be evenly distributed with 4 groups of color strips with a thickness of 0.1-0.3mm.
Key points for construction and application
Technical requirements for connectors
| Air-tight performance | No leakage at 0.1MPa pressure for 24h |
| Connection force | ≥4300N (φ40/33 specification) |
| Chemical corrosion resistance | Pass 5%NaCl, 40% acid and alkali solution tests |
Storage and transportation specifications
- Each reel of silicon core tube should be marked with product mark + production date + reel number
- Forklifts/cranes must be used for unloading, and direct pushing is prohibited
- The stacking site must be flat, away from heat sources and a no-fire sign must be set up
Comparison of detection methods
Main test changes between the new and old standards
- Dynamic friction coefficient: Added the drum method (Appendix D) as a process comparison method
- Out-of-roundness test: Clarified the 5-section measurement method (Appendix B)
- Resistance to thermal stress cracking: Added normative Appendix F test procedures
Key instrument requirements
The accuracy of the load cell of the universal testing machine must be ≥ Grade 1, the graduation value of the vernier caliper is 0.02mm, and the micrometer with a graduation value of 0.01mm is recommended for wall thickness measurement.
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