Looking at my page of photographs of other
applications of pleating suggests that a significant
motivation for using pleating would be expected to be that it
provides a mechanism for producing flexible, deformable or
In the context of roofing structures, the most significant
type of movable structures that are required are
There are three main types of retractable structure that pleating
A number of folding retractable roofs exist:
- Structures that fold up like a concertina or a fan;
- Structures that consist of sliding panels;
- Structures that roll up.
|Vienna City Hall Courtyard
There are sliding panel designs - such as the Komatsu dome in Japan.
Use of a pleated fabric panel results in a lightweight
result - and creates a convenient rectangular panel with
Since pleating does not cause a substantial extension into
the third dimension, sliding panels of pleated material can
be stacked up when retracted - to increase the fully exposed
Lastly a "roll-up" design would operate as shown in the following three diagrams:
|Roll-up retractable pleated roof pattern
The function of the third stage is to to create the pleated
It puts the entire membrane into tension, provides it with
support - and eliminates any flat or horizontal regions.
Sergio Pellegrino's ring