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Copyright © 2009 GEBEL Aquasafe. • All Rights Reserved • May 2010 • Pub. No. MAN 2000
FIBREGLASS WETWELL INSTALLATION
TABLE 1
Fibreglass Wetwells With External Anti Floatation Ribs:
The wetwell bottom is designed to BS4994 to any resist buckling of the wetwell bottom from external water
pressure and internal pressure, in the installed condition with a compacted base to Figure C.1, and the
perimeter of the wetwell including the anti-floatation Ribs embedded in concrete.
This table must be followed for the concrete slab design for all wetwells with fiberglass external ribs.
These slabs are designed to AS3600.
In some cases the slab and/or reinforcing design is controlled by temperature requirements and in other
cases by flexure.
Use minimum 20Mpa concrete
Since some of the slab designs are controlled by temperature, the slab thickness should not be increased
without the approval of a Design Engineer
COLUMN 1.
COLUMN 2.
COLUMN 3.
COLUMN 4.
COLUMN 5.
Wetwell
Dia. mm
Reinforcement
REO
–
BAR (In Center of
Slab, Ref-Figure 1.)
Required Slab
Extension Around
Wetwell (mm)
Slab Thickness
(mm)
Required Ballast
Extension Around
Wetwell (mm)
Ballast Height
(mm)
1200
1 @ 1800mm Dia. N12
400
200
300
400
1520
1 @ 1920mm Dia. N12
500
200
350
500
1850
1 @ 2250mm Dia. N12
&
1 @ 2650mm Dia. N12
550
200
400
600
2200
1 @ 2600mm Dia. N12
&
1 @ 3000mm Dia. FN12
700
200
500
700
2470
1 @ 2900mm Dia. N16
&
1 @ 3300mm Dia. N16
800
250
500
800
3000
1 @ 3400mm Dia. N16
&
1 @ 3800mm Dia. N16
900
300
700
1000
FIGURE 1
BACKFILL
(REF - SECTION "D", TABLE"D-1")
SLAB THICKNESS
(REF - TABLE"1", COLUMN 3)
BALLAST HEIGHT
(REF - TABLE "1", COLUMN 5)
COMPACTED EARTH TO 95% STANDARD
COMPACTION @ 300mm DEEP
BALLAST EXTENSION AROUND WETWELL
(REF - TABLE"1", COLUMN 4)
SLAB EXTENSION AROUND WETWELL
(REF - TABLE"1", COLUMN 2)
REINFORCMENT
REO-BAR
(IN CENTER OF SLAB)
REINFORCMENT REO-BAR
(REF - TABLE"1", COLUMN 1)
Fibreglass Wetwells With External Anti Floatation Ribs:
The wetwell bottom is designed to BS4994 to any resist buckling of the wetwell bottom from external water
pressure and internal pressure, in the installed condition with a compacted base to (Figure 1, below) and the
perimeter of the wetwell including the anti-floatation Ribs embedded in concrete.
This table must be followed for the concrete slab design for all wetwells with fiberglass external ribs.
•
These slabs are designed to AS3600.
•
In some cases the slab and/or reinforcing design is controlled by temperature requirements and in other
cases by flexure.
•
Use minimum 20Mpa concrete
•
Since some of the slab designs are controlled by temperature, the slab thickness should not be increased
without the approval of a Design Engineer
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