Wuhan Dunkou Yangtze River Bridge — Application of U-Rib Double-Sided Welding Technology
Engineering Service
Orthotropic Steel Deck U-Rib Double-Sided Welding Engineering
正交异性钢桥面板U肋双面焊接工程服务
Engineering services using robotic internal welding to form double-sided U-rib-to-deck welded joints for new orthotropic steel bridges, improving local stress distribution, weld integrity and fatigue performance.
面向新建正交异性钢桥，通过机器人在U肋内部实施焊接，形成U肋与桥面板内外双面焊接结构，改善局部受力状态、焊接质量及抗疲劳性能。
Supplied by Wuhan Lixin Technology Co., Ltd.
Overview
Service overview
Conventional U-rib-to-deck joints have historically relied on external single-sided welding because of the restricted internal space of the U-rib. The resulting unwelded root region can create significant stress concentration under repeated wheel loading.
Lixin’s U-rib internal welding technology introduces compact robotic welding equipment into the U-rib to add an internal weld. Combined with the external weld, this creates a double-sided welded detail and improves the fatigue behaviour of the U-rib-to-deck connection.
The technology was first applied to the Wuhan Dunkou Yangtze River Bridge in 2016 and has subsequently been applied to more than 200 bridge projects.
传统U肋与桥面板连接受内部空间限制，通常采用外侧单面焊接。单面焊结构在焊根区域形成的未焊透部位，在车辆反复轮载作用下容易产生明显应力集中。
锂鑫科技利用小型智能焊接机器人进入U肋内部增设内焊缝，与外侧焊缝形成双面焊接结构，从而改善U肋与桥面板连接部位的局部受力及抗疲劳性能。
该技术于2016年首次应用于武汉沌口长江大桥，此后已应用于200多座桥梁工程。
Scope
Service scope
Key components that may be provided for relevant engineering scenarios.
- U-rib double-sided welding process planning
- U-rib internal and external welding
- Assembly-and-welding integration
- Welding equipment configuration
- Process monitoring and weld tracking
- Weld quality inspection
- Localized grinding and supplementary welding
- Production-line integration and technical support
- U肋双面焊工艺设计
- U肋内焊及外焊实施
- U肋组焊一体化
- 焊接装备配置
- 焊接过程监控及焊缝跟踪
- 焊缝质量检测
- 局部缺陷修磨及补焊
- 生产线集成及工程技术支持
Scenarios
Applicable project scenarios
Typical project conditions where this offering may be relevant.
- New orthotropic steel deck bridges
- Cable-stayed and suspension bridges
- Highway steel box-girder bridges
- Railway steel bridges
- U-rib stiffened steel deck fabrication
- Projects with enhanced fatigue-performance requirements
- Automated steel bridge panel production
- 新建正交异性钢桥面板工程
- 斜拉桥及悬索桥
- 公路钢箱梁桥
- 铁路钢桥
- U肋加劲钢桥面板制造
- 对疲劳性能要求较高的钢桥项目
- 钢桥板单元自动化制造项目
Offering Details
Technical Details & Applications
Fatigue Performance
Finite-element analysis comparing single-sided and double-sided U-rib welded details showed that adding an internal weld significantly reduces local stress concentration. In the referenced analysis, the maximum stress at the internal weld toe was approximately 36% lower than the weld-root stress of the single-sided joint.
Fatigue testing conducted jointly with Huazhong University of Science and Technology showed that, under the tested conditions, double-sided welded specimens achieved more than four times the fatigue life of comparable single-sided welded specimens.
Engineering Applications
U-rib internal welding and associated double-sided welding technologies have been applied to more than 200 new bridge projects, with cumulative internal weld length approaching 8 million metres.
Representative applications include:
- Wuhan Dunkou Yangtze River Bridge
- Qipanzhou Yangtze River Bridge
- Shenzhen–Zhongshan Link
- Jiayu Yangtze River Bridge
- Qingyun Expressway Xijiang River Bridge
- Danjiangkou Reservoir Bridge
- Shishou Yangtze River Bridge
- Yanji Yangtze River Bridge
- Ningbo–Zhoushan Port Main Passage
Standards
Relevant technologies have been incorporated into technical documents including:
- *Technical Guide for Construction of Conventional-Span Highway Steel Bridges*
- *Technical Guide for Double-Sided Welding of U-Ribs in Orthotropic Steel Bridge Decks* (T/CHTS 10029-2020)
- Zhejiang Province’s *Guide for Fabrication of Highway Steel Bridges* (ZJ/ZN 2019-14)
技术说明与应用案例
抗疲劳性能
U肋单面焊与双面焊结构有限元对比分析表明，增设内焊缝能够明显降低局部应力集中。在相关分析中，双面焊结构内侧焊趾最大应力较单面焊焊根应力值降低约36%。
与华中科技大学合作开展的疲劳试验表明，在相关试验条件下，双面焊试件疲劳寿命较单面焊试件提高4倍以上。
工程应用
U肋内焊及双面焊接技术已应用于200多座新建桥梁，累计内焊焊缝长度接近800万米。
代表性应用包括：
- 武汉沌口长江大桥
- 湖北棋盘洲长江大桥
- 深中通道
- 湖北嘉鱼长江大桥
- 清云高速西江特大桥
- 湖北丹江口水库大桥
- 湖北石首长江大桥
- 湖北燕矶长江大桥
- 宁波舟山港主通道
标准应用
相关技术已纳入包括以下技术文件：
- 《公路常规跨径钢结构桥梁建造技术指南》
- 《公路桥梁正交异性钢桥面板U肋双面焊接技术指南》（T/CHTS 10029-2020）
- 浙江省《公路钢结构桥梁制造指南》（ZJ/ZN 2019-14）
Related Products & Solutions
关联产品与解决方案
Automatically selected based on supplier, category, keywords and offering type.
PROFESSIONAL SERVICES
Steel Bridge Technology Licensing & Engineering Consulting
钢桥技术授权与工程咨询
View Details
EQUIPMENT
Steel Bridge Intelligent Welding Equipment & Automated Production Lines
钢桥智能焊接装备及自动化生产线
View Details
INTEGRATED SOLUTIONS
In-Service Steel Bridge Condition Assessment & Minimally Invasive Reinforcement
在役钢桥病害检测评估与微创加固
View Details