Expansion Joint is a specially designed connector that allows movement between two structures or parts of a system without causing damage. Common Types of Expansion Joints Concrete Expansion Joints → Gaps filled with compressible material in sidewalks, bridges, and roads. Bridge Expansion Joints → Large mechanical joints (like finger joints or rubber seals) that allow road decks to expand/contract with temperature. Metal Expansion Joints → Corrugated bellows that flex in high-pressure/temperature pipelines (steam, oil, gas). Rubber Expansion Joints → Flexible rubber connectors in pumps/pipes to absorb vibration & misalignment.