STRUCTURAL GLASS FACADES - USC School of Architecture

2.5.8 Point-fixed Clamped
The above method of point-fixing has the
disadvantage of requiring drilling and countersinking
of the glass panes, and with insulated glass units
the insertion of a sealing ring in the space between
the glass panes around the bolt hole. Each
laminated or insulated glass unit requires the drilling
of at least eight holes. Insulated-laminated panes
require a minimum of 12 holes. Obviously, this adds
to the cost of the glass panels.
An alternate strategy that eliminates the need for
Figure 2.38 Detail of a point-fixed clamped
drilling and instead clamps the glass at the
system (ASIDI).
perimeter is frequently referred to as a “pinch-plate” system. With a spider-type system, the
spider component is rotated 45 degrees so that the spider arms are aligned with the glass
seams. A narrow blade of metal penetrates from the spider through the center of and parallel
to the glass joint. A relatively small clamp plate on the outside surface of the glazing plane is
then fixed to the blade, clamping in place the two glass panels on either side of the seam.
Another strategy, frequently employed on cable nets, is to set the glass into a specially
designed clamp component tied to the supporting structure. A cover plate is then attached
over the outside corners of the glass, effectively clamping the glass at the corners. Neoprene
pads are used on both faces of the clamps to protect the glass.
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