Which joint is used to accommodate very large movements and consists of multiple strip or compression seals?

• A. PVT - Point of Vertical Tangency
• B. PVI - Point of Vertical Intersection
• C. Mandrel
• D. Modular Joint

Answer: (D)

Modular joints are designed for very large movements between bridge deck segments. They are built from a series of interlocking blocks placed in a row, with strip or compression seals between adjacent blocks. As the temperature, loads, and geometry cause expansion or contraction, these seals compress and extend, allowing substantial horizontal movement while keeping a continuous, watertight, and smooth deck surface. This modular approach also makes maintenance easier, since individual blocks or seals can be replaced as needed. The other terms refer to different concepts (vertical alignment references or a tooling device) and do not describe a joint type used for large movements with multiple seals.