These expansion joints can be fabricated as a single and multiple arched elements with flanged connections, plus a system of articular supports that allow for angular movement in one plane only.
The hinged mechanism is designed to accept full pressure thrust.
These expansion joints can be fabricated with more than one convolution.
These units do not allow axial movement. However,some types of hinged systems can be provided with slotted holes for the hinge pins, to allow limited axial displacement. The “slotted hinge” units cannot resist the pressure thrust forces and therefore proper anchorage must be provided.
