Reverse mounting of central control bridge
Reverse mounting of a central control bridge involves installing bridge supports or control systems in a sequence opposite to conventional methods, ensuring proper alignment, load transfer, and operational safety.
Structural Reverse Installation
Reverse mounting in bridge construction often refers to the basin-type support installation where components are assembled from the top down or in a non-traditional sequence. The typical steps include:
- Foundation Preparation: Marking the foundation and main rib positions, drilling anchor bolt holes, and implanting anchor bolts for leveling plates .
- Leveling Plate Installation: Mounting the leveling steel plate on anchor bolts to ensure precise alignment.
- Support Placement: Lifting the support beneath the leveling plate and connecting it securely.
- Support Cushion Construction: Installing reinforcing steel bars, constructing the support cushion, and performing grouting to finalize the load-bearing interface . This method is particularly useful for large-span bridges or when adding new pier columns to existing structures, as it allows the support to handle live loads effectively while maintaining structural integrity .
Control System Considerations
For central control bridges, reverse mounting may also involve upgrading or reconfiguring the control system:
- Motor Drives and PLCs: Modern upgrades use Allen Bradley or Rockwell Automation motor drives, PLC processors, and touch screen operator panels. These components are often bench-tested and networked via Ethernet before installation .
- Sequential Operation and Safety Interlocks: The control system manages multiple stages of bridge operation, including traffic lights, gates, brakes, and span locks. Reverse mounting may require reprogramming PLCs to account for mechanical changes or reversed motor orientation .
- Commissioning: After installation, motor drives are commissioned with open-loop vector control and encoder feedback to ensure proper torque and synchronization between paired motors .
Best Practices
- Alignment Verification: Ensure anchor bolts, leveling plates, and supports are precisely positioned to prevent uneven load distribution.
- Safety Interlocks: Confirm that all interlocks, sensors, and operator interfaces are correctly configured for the reversed installation sequence.
- Testing Before Operation: Conduct bench testing and dry runs to verify mechanical and electrical integration.
- Documentation and Compliance: Follow manufacturer guidelines for contactors, overloads, and motor drives to ensure compliance with safety and operational standards . Reverse mounting of a central control bridge is a complex process that combines structural engineering precision with advanced control system integration, ensuring both mechanical stability and safe, reliable bridge operation.
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