8 –
TANDEM
®
SYSTEM
ANCHOR SYSTEM
The way in which the setback anchor is positioned in the Tandem wall
system determines the slope of the wall . This positioning is what allows
for either vertical or sloped walls .
Generally, at least one setback anchor must be installed per
Tandem 90 unit, with two setback anchors for the Tandem 180 unit,
to make sure the wall is stable . Setback anchors come with or without
blades . No-blade setback anchors are used in curved walls . Both types
of anchor can be used in straight walls .
Allowable heights
(1)
: 650 mm (26 in) without a slope (0°, vertical);
1 .050 mm (42 in) with a slope of 9°
Note: For a 9° of slope, the setback per row of 90 mm (3 9/16
"
)
is 14 mm (9/16
"
) and the setback per row of 180 mm
is 28 mm (1 1/8
"
)
(1)
Maximum height of the wall including the buried portion of 150 mm (6 in)
without additional load or embankment above the wall .
There are several ways to build a Tandem retaining wall:
Using only Lafitt and Melville Tandem 90 units
Using only Lafitt and Melville Tandem 180 units
Combining Lafitt and Melville Tandem 90 and 180 units in a single wall
Using only Esplanade Tandem 180 units
A typical cross-section and installation pattern are shown
for each type of wall .
BUILDING A RETAINING WALL
Position for building a wall
on a 9° slope .
Maximum height of 1 .05 m (42
"
)
Position for building
a vertical wall .
Maximum height of 0 .65 m (26
"
)
Basic
model
Model
without blades
C1
C2
Note: It is possible to use Lafitt and Melville Tandem veneer units in the same wall .
