1.What is the function of a rubber expansion joint?

A rubber expansion joint will provide the following:

1. Compensate axial movement

2. Compensate for lateral, torsional and angular movements

3. Reduce vibration

4. Dampen sound transmission

2.What types of movements will a rubber expansion joint handle?

 A rubber expansion joint will allow for the following movements:

1. AXIAL COMPRESSION: The dimensional reduction or shortening of the face to face parallel length of the joint measured along the longitudinal axis.

2. AXIAL ELONGATION: The dimensional increase or lengthening of face to face parallel length of the joint measured along the longitudinal axis.

3. TRAVERSE OR LATERAL MOVEMENT: The movement or relating displacement of the two ends of the joint perpendicular to its longitudinal axis.

4. VIBRATION: The movement of the joint due to vibrations which are effectively intercepted and insulated against transmission to the remainder of the system.

 5. ANGULAR MOVEMENT: The displacement of the longitudinal axis of the joint from its initial straight line position ( a combination of axial elongation and axial compression).

 6. TORSIONAL MOVEMENT: The twisting of one end of the expansion joint with respect to the other end about its longitudinal axis.

 7. CONCURRENT MOVEMENTS: The combination of two or more of the above listed movements. This value is expressed as the Resultant Movement.