GRC Production - OCV Reinforcements

SPRAYING OF TYPICAL DETAILS (Continued)
DETAILS METHOD DIAGRAM
3. EDGE RIBS USING
FOAM FORMER
a) Spray in layers. Compact with rollers
and check correct thickness on side-wall
and base.
b) Place pre-cut foam former with edges
chamfered as shown.
D = design thickness +10%
D
45
approx
c) Spray over former and also between
former and overspray.
Fold back overspray with a trowel.
d) Spray to correct thickness.
Pay special attention to thickness at (a) and
ensure sufficient overlap of new and
original sprayed GRC at (b).
a
b
4. CENTRE RIBS
USING FOAM
FORMER
a) Spray and compact front face in layers.
Check thickness then place former,
ensuring that the top is at the correct
height.
Foam rough-cut or precut
to a semi-circular or
other profile
b) Spray over back and sides of former in
layers. Check thickness is correct,
especially at (a). Taper the thickness at (b)
ensuring a gradual change.
b
a
a
b
5. CENTRE RIB USING
PRESPRAYED GRC
VOID FORMER
As above, but using a 3 – 5mm thick GRC
void-former.
The thickness of the void former is not
counted as part of the rib design thickness.
b
a
a
b
20
18