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 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.
LCL'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, 600 mm. In applications where effective
maintenance practices are carried out then LCL'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 LCL finger
joint is custom designed and fabricated to individual specifications.