Movable bridges are monuments of engineering, seamlessly integrating infrastructure with waterways. Whether it’s a bascule bridge lifting for a tall ship, a vertical lift bridge rising for a barge, or a swing bridge pivoting to open a channel, their motion must be precise, controlled, and above all, safe. The unsung hero ensuring this safety is the bridge’s braking system.
This technical guide delves into the critical functions of brakes on movable bridges and introduces the robust, engineered solutions required for this demanding public infrastructure application.
The Critical Roles of Brakes on Movable Bridges
A bridge’s braking system performs three distinct but equally vital functions:
- Dynamic Braking (Service Brake): This is the primary function used to smoothly decelerate the moving bridge span and bring it to a controlled stop at the fully open or closed position. The brake must absorb and dissipate immense kinetic energy without causing shock or vibration to the structure.
- Static Holding (Parking Brake): Once the bridge span is in position (either open or closed), the holding brakes engage to lock it securely in place against external forces like high winds, water currents, or accidental impacts. This requires consistent, long-term static torque.
- Emergency Braking (E-Stop): In the event of a drive system failure or an emergency command, this system must bring the moving span to a rapid and safe stop. This function demands the highest level of reliability.
Why Fail-Safe Design is the Only Option for Public Safety
For an application as critical as a movable bridge, the braking system must be inherently fail-safe. This means the brake is designed to engage automatically if power or hydraulic pressure is lost. The universal standard is a spring-applied, hydraulically-released disc brake system.
Powerful mechanical springs provide the force to clamp the brake pads onto the disc. Hydraulic pressure is used only to release this force. Should the control system or power supply fail, the hydraulic pressure vanishes, and the springs instantly and safely apply the brakes, locking the bridge in its last position. This principle is the bedrock of movable bridge safety.
Engineered Braking Solutions for Bridge Machinery
At HMIC, we provide heavy-duty braking systems specifically designed for the lifecycle and safety demands of bridge machinery.
For Dynamic & Emergency Braking: SDBH_I Series Hydraulic Brakes
The SDBH_I series is engineered for the highest energy absorption demands. Installed on the main drive pinion or motor shaft, it acts as the primary service and emergency brake.
- Extreme Torque & Thermal Capacity: Capable of delivering braking torques in excess of 150,000 Nm, the SDBH_I series can safely stop the massive inertia of a moving bridge span. Its design is optimized for dissipating the heat generated during dynamic stops.
- Unmatched Reliability: Built with robust materials and designed for mission-critical applications, it provides the ultimate layer of safety for emergency stops.
Explore the technical specifications of our SDBH_I Series High-Energy Disc Brakes.
For Static Holding & Parking: SH Series Hydraulic Brakes
While the SDBH_I can also hold, the SH series is a highly efficient and reliable solution specifically for static holding requirements.
- Consistent Holding Force: The SH series provides powerful, consistent static braking force to lock the bridge span securely against wind loads for extended periods.
- Durability for Outdoor Environments: These brakes are designed with superior sealing and can be treated with marine-grade coatings to withstand decades of exposure to weather, humidity, and temperature fluctuations.
Learn more about the long-term reliability of our SH Series Hydraulic Fail-Safe Brakes.
Powering the System: YZ Type Hydraulic Power Units
A reliable brake is only as good as its power source. Our YZ(J) Type Hydraulic Power Units are engineered to work seamlessly with our brake calipers, providing the stable hydraulic pressure needed for controlled release and providing monitoring capabilities for the entire system.
Quick Selection Reference Table: Movable Bridge Brakes
| Parameter | SDBH_I Series Hydraulic Fail-Safe Brake | SH Series Hydraulic Fail-Safe Brake |
|---|---|---|
| Primary Function | Dynamic & Emergency Braking | Static Holding & Parking |
| Design Focus | Maximum energy absorption, high thermal capacity, ultimate safety. | Long-term static holding power, environmental durability, high reliability. |
| Fitur Utama | Very high torque, robust construction, optimized for dynamic cycling. | Consistent static torque, superior sealing, corrosion-resistant options. |
| Bridge Application | Main drive service brake on bascule, lift, and swing bridges. E-stop brake. | Secondary holding brake, machinery lock-out for maintenance. |
| Pelajari Lebih Lanjut | View SDBH_I Series Details » | View SH Series Details » |
Conclusion: Engineering for a Century of Safety
Movable bridges are designed to last for generations. Their braking systems must match this standard of longevity and reliability. By implementing a robust, fail-safe hydraulic braking strategy, bridge designers and authorities can ensure the safety of the public and the integrity of these vital infrastructure assets for decades to come.