Finger Expansion Joint

Finger Type expansion joints are commonly used in bridge construction to manage expansion and contraction effectively while minimizing noise pollution compared to other joint types. These joints consist of interlocking steel plates, arranged in a "finger" pattern, that span the gap between road sections. This design allows the plates to move in relation to each other along the direction of the "fingers," accommodating structural movement.

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One advantage of Finger Type joints is the lack of moving parts, which reduces stress on the structure by minimizing cantilever moments. Additionally, a large, reinforced neoprene gutter beneath the joint acts as a drainage system, channeling water efficiently into the bridge’s ducts. This gutter prevents the accumulation of standing water, reducing the risk of vehicles aquaplaning on the bridge surface.