|
Methods
The glass is fixed to the spider using a
variety of fixing devices, depending on
the aesthetic requirements and the
imposed loads onto the glass. The size
of the fixing will vary according to the
application and can be used on glass
canopies, balustrades, curtain walls and
internal furniture.
Materials:
Generally Grade 304 machined stainless
steel. Spacers and gaskets are the best
quality materials compatible with the
specific application.
Figure
1
The countersunk fitting provides an
attractive, smooth surface and the
articulation allows for the glass to flex, significantly reducing
the stresses in the
glass. Up to 15° faceting of the wall can
be accommodated by the rotational action. Compensating bolts on
the spider allow
up to 25mm final adjustment and alignment.
Figure 2
The button provides good bearing surfaces
for the glass on both sides. This is
particularly relevant for horizontally
supported glass which is required to carry
human and dynamic loads such as wind,
hail and snow. The faceting and final
adjustment is the same as for Figure 1.
|
 |
Figure 3
The countersunk bolt is smaller than that
in Figure 1 and this fitting is suitable for applications with lower
forces applied to
the glass, thus reducing the same need for articulation.
Figure 4
This button provides good bearing surfaces
and is suitable for applications with lower
forces and/or smaller panels of glass. Thus reducing the need for
articulation. |
Rear Methods
The Spider is fixed to the support structure using a variety
of methods that are capable
of withstanding the loads imposed by the
glass. The shape and size of the rear
fixing is usually customized to suit the
configuration of the rear structure.
Numerous options are available.
Material:
Generally Grade 304 machined stainless
steel or mild steel, galvanized, painted or powder coated.
Figure 5
The Tapered boss is welded to a solid bar which has a threaded hole
to receive the
spider. When the spider has been aligned
and leveled, two holes are drilled into the
boss to accommodate the shear pins which are then tapped through the
spider into the boss behind.
Figure 6
The Square shouldered boss (which has a threaded hole to receive the
spider) is
welded to a hollow tube. When the spider
has been aligned and leveled, two holes
are drilled to accommodate the shear
pins which are then tapped through the
spider into the boss behind. |
 |
Figure 7
The spider is bolted directly to the
support structure. When the spider
has been aligned and leveled on the
bolt, two holes are drilled through the
structural member. Where necessary
for shear purposes, a stainless steel
washer is placed behind. These will accommodate the shear pins which
are tapped through the spider into the
washer. This system allows for oversized
holes in the structure to receive the bolt
and provide for adjustment. In all cases
the bolt is to be tightened to specified
torque loads.
Figure 8: DEAD LOAD SUPPORT:
The machined dead load support boss
is fastened to the spider with two
machine screws. One threaded hole in
the top edge of the boss is right hand
and the bottom one is left hand. The
dead load support rods or cables are
similarly threaded and screwed into the
boss as part of the preliminary assembly
before final alignment. Flat surfaces
provided on the rods allow for adjustment
using a wrench and are used for final
alignment. |