Semicircular staircases
Stairs - Production types and technology

Definition

Semicircular staircases represent the second family, and correspond to structures with a non-rectilinear tread line.

This is made up of one or more (usually two) circular parts (quarter-circle or half-circle) connected to straight lines.

This layout requires irregularly shaped steps in sections where the stride line is circular (balanced steps).

The layout of these steps is called the swing.

Types

Semicircular staircases include :

• flights with a "turning quarter", i.e. a part of the flight (generally at a...