Trestle

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Trestle, in engineering, is a structure used to support railroad tracks or a road over a valley, or at a crossing point over railroad tracks or a road. A wooden trestle, made of bents (tall posts connected by ties and braces), usually costs less to build than a bridge. Trestles may also be made of iron or steel.

Caisson

Caisson, KAY son, in building, is a watertight chamber that is used in the construction of building foundations, bridges, tunnels, and other… See more »

Air lock

Air lock is a device that permits people or materials to pass in or out of a structure called a pneumatic caisson. The caisson contains compressed… See more »

Pile

Pile is a column used to support buildings, bridges, and other structures. Piles are often used to prevent buildings from sinking or collapsing.… See more »

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Trestle

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