Caisson

A watertight chamber used in shaft construction under water. The ground within the chamber is excavated allowing the chamber to sink under its own weight into the ground.

Camber

Rise or crown of the center of a bridge, or Bowline through a culvert, above a straight line through its ends.

Can

A principal module that is part of a shield machine such as an MTBM or tunnel boring machine (TBMs); its use depends on the installation dimensions required and the presence of an articulated joint to facilitate steering. The can may also be referred to as a trailing tube.

Cantilever

The part of a structure that extends beyond its support.

Capital

A sum of money used to implement projects.