Granor ETIC Series Expansion Joints are capable of movements up to 500mm total and are made of three main components:
1. Metallic element - The metallic elements are made of extruded aluminum for strip seal joints, of cast aluminum for 'saw tooth' finger joints and of galvanized steel in the case of traditional 'slender finger' type finger joints. Segments of these metallic elements are modularized into 2 or 3 meter long sections, enabling easy transportation and simplified site installation handling.
2. Pre-stressed Tie Bolts - In each of the above joint types, all the metallic elements are fixed to the structure by pre-stressed tie bolts which are post-tensioned after infill concrete has achieved required strength by use of a torque wrench or jacking procedure.
3. Elastomeric Profile - An elastomeric continuous extrusion profile is inserted between the metallic elements in all the above Granor ETIC Joint types, providing water tightness and resistance to debris ingress into the underside structure joint gap. These Elastomeric glands are located below the riding surface and thus are not subjected to vehicular loads.
The Elastomeric glands are cellular and designed to compress and extend without transmission of excessive horizontal forces into the structure. Glands can conform to changes of grade to comply with curb upturns.