 Preparation
& Setting Out
Chevloc components are transported
on timber pallets for ease of offloading and effective
site distribution.
Chevloc walls are normally erected
on to a concrete strip foundation which should be designed
at a frost free depth and with due regard to local ground
condition and the height of wall to be constructed.
The purpose designed base unit should be bedded onto
the concrete foundation with a 3:1 sand cement mortar
to required lines and levels, after first checking the
correct orientation of base units according to the type
of wall being constructed, i.e. inclined or vertical.
Unit Splitting
Chevloc wall units are supplied in pairs for
on site splitting, providing an attractive split stone
face on batter walls and alternately banded courses
of plain and split face on vertical walls.
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| Typical Section (Batter)
Gravity Wall Construtction |
A deep “V” groove is provided around the
centre of the double units to facilitate easy splitting,
a 100mm brick layers’ bolster and club hammer
is all that is required. It is recommended that splitting
be carried out by lightly scoring all around the unit
at the base of the “V” groove in order to
ensure an even and clean split.
Wall erection can now proceed rapidly according to
site alignment and profile. It is advisable to apply
a string line to each course to check correct alignment
and during construction to use a batter board to check
that the correct batter is being maintained.
Wall Construction
In a battered wall (6:1) the blocks are placed
so that the thinner segments are all outward facing,
i.e. split face outermost.
In vertical walls every alternate course is reversed
giving a banding effect of plain and split faced courses.
It is recommended that the free draining back fill material
be placed and compacted in two course increments, recommended
backfill material being Type “B” in accordance
with the “Specification for Highway Works: Volume
1: 1991: Table 5/5”.
Where required the Chevloc wall units
may be spaced apart by up to 100, to facilitate planting
by infilling the gaps between the units with top soil.
As the spacing of the units will have an effect on the
overall wall design, this should be checked with the
manufacturer against the known design criteria to ensure
that wall stability will not be compromised.
Coping Course
The top course of wall units are normally placed
butt tight to provide a continuous coping.
To prevent accidental displacement or deliberate removal
by vandals, it is recommended the top course of units
be bonded to the course below by the application of
four spots of Thixotropic epoxy adhesive as Sikadur
31 or similar.
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| Typical section (Vertical)
Free Standing Walls |
Wall Ends
On straight walls with a perpendicular end it is necessary
to cut half length units from standard units in order
to close the bond on every alternate course. This can
be effectively achieved using a suitable abrasive wheel
cutter to score around the unit to a depth of approximately
20mm. A brick layers’ bolster can then be used
to complete the cut. It will only be necessary to cut
all the way through the unit with the abrasive wheel
if a smooth face is required but it is usually possible
to position the cut face innermost into the wall.
Having completed the cut it is necessary to grind a
small chamfer detail along the front face of the cut
in order to maintain the uniform picture framing effect.
Radius & Corner Construction
Chevloc walls can be constructed down to a
minimum radius of five metres. Internal and external
corners can be constructed either by cutting and mitring
units at the corner intersection or by building one
wall to align with the rear face of the right angle
return.
Corner constructions can be reinforced by the inclusion
of strips of high strength geotextile trapped between
the block courses across the corner intersection. The
Company is pleased to provide details for corner and
radius constructions on a site specific basis.
N.B. It is most important to ensure
that the wall is not subjected to any undue loading
during the construction stage which it is not designed
to withstand. |
