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424 Barry’s Advanced Construction of Buildings
Brackets support
brickwork
Lock nut
and bolt
Channel
cast into
concrete
Concrete
Gusset plate
built into
perpends
Brickwork
facing
Figure 7.7 Loadbearing fixing for brickwork.
angle by building in a compressible strip, which is pointed on the face with mastic to
exclude water.
As an alternative to a continuous angle support, a system of support brackets may be
used. These stainless steel brackets fit to a channel cast into the concrete. An adjusting bolt
in each bracket allows some vertical adjustment and the slotted channel some horizontal
adjustment so that the supporting brackets may be accurately set in position to support
brickwork as it is raised. The brackets are bolted to the channel to support the ends of
abutting bricks, as illustrated in Figure 7.7. A horizontal movement joint is formed at the
level of the bracket support. Supporting angles or brackets may be used at intervals of not
more than every third-storey height of building or not more than 9 m, whichever is the
less, except for four-storey buildings where the wall may be unsupported for its full height
or 12 m, whichever is the less. Where support is provided at every third storey height, the
necessary depth of the compressible movement joint may well be deeper than normal brick
joints and be apparent on the face of the wall.
To provide support for the wall against lateral forces, it is necessary to provide some
vertical anchorage at intervals so that the slenderness ratio does not exceed 27 : 1. Fishtailed
or flat anchors fitted to channels cast into columns are bedded in the face brickwork at the
same intervals as wall ties, as illustrated in Figure 7.8, to provide lateral and vertical
restraint. To provide horizontal, lateral restraint, anchors are fitted to slots in cast-in channels
in beams or floor slabs at intervals of up to 450 mm. To provide anchorage to the top
of the wall at each floor level where brick slips are used, it is usual to provide anchors that
are bolted to the underside of the beam or slab and to fit stainless steel ties that are built
into brickwork at 900 mm centres, as illustrated in Figure 7.2.