Sliding Plate Expansion Joint STEEL-COMPRESSION-SEAL-002

The Finger-Type Bridge Expansion Joint is an innovative engineering solution designed for medium to large-span bridges requiring reliable movement accommodation with minimal maintenance requirements. This expansion joint system features interlocking steel fingers that create a comb-like structure, allowing for smooth longitudinal movement while maintaining structural integrity and providing a comfortable driving surface for vehicles crossing the bridge. Manufactured from high-strength structural steel with advanced surface treatments, our finger-type expansion joints deliver exceptional durability and corrosion resistance. The interlocking finger design distributes traffic loads efficiently across multiple contact points, reducing stress concentrations and extending the service life of both the expansion joint and the bridge deck. The system incorporates precision-machined components that ensure smooth operation even under extreme temperature variations and heavy traffic conditions. **Design Standards Compliance:** Our finger-type expansion joints are engineered in full compliance with European Standard EN 1337-4 (Structural Bearings - Part 4: Roller Bearings) and American Standard AASHTO LRFD Bridge Design Specifications. The manufacturing process follows stringent quality control protocols aligned with ISO 9001:2015 and ISO 14001:2015 environmental management standards. All materials used in production meet or exceed the requirements specified in ASTM A709 for structural steel used in bridges. **Technical Specifications:** - Movement Capacity: 40mm to 400mm - Finger Width: 80mm to 120mm (standard configurations) - Material: ASTM A709 Grade 50 structural steel - Surface Treatment: Hot-dip galvanizing + epoxy coating - Load Rating: AASHTO HL-93 live load - Fatigue Resistance: 2 million cycles (AASHTO specifications) - Noise Level: <75dB at 80km/h vehicle speed - Installation Tolerance: ±2mm **Application Scenarios:** Finger-type expansion joints are ideal for highway bridges, urban overpasses, and railway bridge structures where movement ranges fall between 40mm and 400mm. They perform exceptionally well in high-traffic environments, including interstate highways, toll plazas, and bridge approaches where smooth vehicle transition is critical. The system is particularly effective in regions with moderate temperature fluctuations and has been successfully installed in over 300 bridge projects worldwide, including major infrastructure developments in North America, Europe, and Asia.