What do you call the pipes used to protect lines passing under a sidewalk?

The term used to describe the pipes that protect utility lines passing under a sidewalk is "sleeve." A sleeve refers to a hollow structure that acts as a protective casing for utility lines, allowing them to pass safely without direct contact with surrounding materials, which can cause wear and damage. This is particularly important for electrical, plumbing, or telecommunications lines that need to remain functional and unharmed as they traverse under pedestrian pathways.

Sleeves help to prevent potential damage caused by ground movement or when the surface is exposed to varying weather conditions and heavy foot traffic. They often are designed to accommodate the specific dimensions and needs of the cables or pipes they are protecting, ensuring that they remain secure and operational. Hence, calling these protective structures “sleeves” accurately describes their function in landscaping and utility management contexts.