What is a trestle used for? A trestle, often associated with the realms of engineering and carpentry, serves as a versatile support structure. Its primary function is to provide temporary or permanent stability to constructions that need elevated platforms or surfaces. Trestles are commonly used in various applications:

　　1. Bridge Construction: The term "trestle" is most famously related to bridge design, especially where lightweight construction materials were preferred over heavier alternatives like stone. In this context, trestles form the supporting legs of bridges, typically made from timber or steel, ensuring they can withstand heavy loads while spanning rivers, valleys, or other gaps.

　　2. Table Support: A smaller-scale application involves using trestles as supports for tables at events or exhibitions. These portable structures offer stability without needing to be fixed to the ground, making them ideal for temporary setups.

　　3. Railway Maintenance: During railway maintenance, trestles are crucial for creating safe workspaces above tracks. They allow workers to repair overhead lines, install signals, or perform inspections on elevated sections of the rail infrastructure without disrupting traffic below.

　　4. Carpentry and Building Sites: On construction sites, trestles act as scaffolding bases or supports for building materials such as beams, planks, or forms when pouring concrete slabs. This ensures safety by providing secure working levels for construction personnel.

　　The versatility of trestles across different fields highlights their fundamental role in enhancing functionality and safety in a wide array of contexts, whether in historical architecture, modern construction, or daily practical uses. Their ability to adapt to various environments makes them essential tools for both professional engineers and everyday users alike.