Heavy Duty Finger Expansion Joints for Prefabricated Bridge

Concrete Modular Bridge Expansion Joint
Viscous Fluid Damper for Bridge and Building Construction

Heavy Duty Finger Expansion Joints for Prefabricated Bridge

Bridge Expansion Joint Device

Large movement finger expansion joints represent one of the best solutions to accommodate bridge expansion and contraction whilst reducing road noise emission to a minimum. Its main elements consist of cantilevered, or sliding, steel plates connected to each side of the road surface’s gap. Designed with a “finger-like” shape, the steel plates easily move within each other; where the primary movement is along the axis of the fingers themselves. Since there are no moving parts attached to the joint, cantilever moments reduce the stress induced to the structure. There is a large replaceable gutter below the joint which is made of reinforced neoprene or EPDM and provides an efficient drainage system into the bridge’s ducts. The gutter also limits the build up of standing water to reduce the possibility of vehicles aquaplaning. 

BAOLI’s finger joints exhibit very low levels of noise emission and therefore offer a high level of driving comfort for fast or heavy traffic. The joints can be designed to reach their full horizontal expansion at, or around, 1000 mm. In applications where effective maintenance practices are carried out then BAOLI’s finger joints will last for a very long time and as such they offer a very cost-effective and durable solution for most bridge applications. Every BAOLI finger joint is custom designed and fabricated to individual specifications.

                   In which: H is the thickness of finger steel plate;

                                    S is the the gap between beam bodies;

                                    A, B is the width of beam body under the finger expansion joint.

Product Name
BAOLI large movement finger expansion joints
Bridge & Sidewalk & Railway & Building & Other structures 
Finger-shape steel plate, Rubber waterstop seal, Stainless steel plate, Bolt
ISO, AASHTO and customer’ requirements
Rubber Material
Neoprene rubber/ EPDM rubber/Natural rubber
Painted or Hot galvanized
10-1000mm, or Customized
Products Show

Key features:

• For movements up to 1000mm;
• Long durability and good grip surfaces;
• High performance and smooth riding comfort;

• Lifespan of 40+ years.


Metal Steel Comb plate Expansion Joint are suitable for both new bridges and existing bridges. They are also good choices for the large-span bridges and do well in replacing the old ones. Finger expansion joints are widely used among steel box girders, among concrete beams, and between steel box girders and concrete beams. Finger expansion joints also can be used in expressway.


 Construction site

BLF-01: Finger expansion joint is installed in connection of bridge.

BLF-02: Finger expansion joint is installed in expressway.

BLF-03: Finger expansion joint is installed in highway.

BLF-04: Finger expansion joint is installed in new bridge.


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