Halfen Systems For The Support and Restraint of Brickwork
Halfen Systems For The Support and Restraint of Brickwork
Halfen Systems For The Support and Restraint of Brickwork
Introduction
Halfen is a leading supplier of channel fixing
systems and building components, with
manufacturing and marketing centres
throughout the world.
Brickwork systems
Support of brickwork above horizontal soft joints
Lintels
Brick ties
Windposts
Design Service
Halfen also offer a comprehensive design
service. For full details, please contact Halfen
Limited.
Typical wall construction at intermediate floor level
showing Halfen brick support system bolted to cast-in
channel in insitu concrete slab. (Wall ties, sliding brick
anchors and windposts also shown.)
Windposts
Cavity windposts
Cavity windposts can be used without cutting
blockwork and are therefore the preferred Structure
CW2
CW3
Blockwork windposts
Blockwork windposts (BW1) are formed from
angle and built into the blockwork inner skin,
as shown. Blockwork windposts are available
in a range of angle sizes. Storey-height post
BW1
Elevation
Normally the angle is folded from 4, 5 or 6 mm
thick plate. Angle dimensions can be selected
from the Halfen standard schedule (page 33), Windpost profiles
or to suit the project detail. Ties for the outer
skin (if required) are the hook-on type WPT 1.
The inner skin ties may be either WPT 3 or
WPT 3PS to suit the slot in the spine.
Materials
Windposts and brick ties are normally
manufactured from Grade 304 stainless steel.
(Grade 316 is also available, if required.)
For dry internal applications hot dip galvanised CW2 CW3 BW1
windposts can be manufactured, but it is
recommended that the ties in the outer skin Windpost ties
are stainless, even if the windpost is hot dip
galvanised.
Dimensions
Typical profile dimensions are given on
page 33, however profiles are manufactured
on a project basis, so any dimensions are
possible. The lengths of windposts are
specified to suit the project requirements. Flange tie Web tie Web tie with plastic sleeves One way web tie
WPT 1 WPT 3 WPT 3 PS WPT 4
Setting-out Posts are positioned in the cavity where The top fixing on storey-height posts is
Relationship to the structure possible, but, if an angle section is needed to normally a sliding fixing to allow for
take the load, the block is cut to allow the deflection, i.e. to prevent the post being
Windposts are set out between the structural
angle to be built into the inner skin. Posts can pinched by the frame.
columns at centres to suit the wind load. In
be fixed to any structure, as shown: concrete
piers it may be necessary to have 2 posts, as
slabs, steel beams or metal deck.
shown below right.
CW2 windpost with WPT 1 ties CW2 windposts with WPT 1 ties
BW1 windpost inner skin bond BW1 windpost inner skin de-bond
WPT 3 tie in inner skin WPT 3 PS tie with plastic sleeve in inner skin
WPT 1 tie in outer skin HTS-C 12 wall ties across cavity
Loadings
The data tables opposite show a range of
typical windposts with their sectional
properties and maximum allowable loads for
Type BW1 top fixing to concrete Type CW2 top fixing to concrete
various heights of post. Other windposts can
be designed on a project basis.
Loading criteria
Storey-height windposts
Type BW1 bottom fixing to hollow core slab: Type CW2 bottom fixing to metal deck
example shows resin sock
CW2 CW3
b b
t a a x x
Code axbxt Area Mass Ixx Zxx Maximum load on windpost (kN)
(mm) (cm2) (kg/m) (cm4) (cm3) Storey height posts (m) Spandrel/parapet posts (m)
2.5 3.0 3.5 4.0 0.75 0.90 1.05 1.20
CW2 6544 65 x 40 x 4 5.13 4.05 32.38 9.96 2.21 1.54 1.13 0.86 1.92 1.33 0.98 0.75
CW2 6545 65 x 40 x 5 6.21 4.90 37.43 11.52 2.56 1.77 1.30 1.00 2.22 1.54 1.13 0.87
CW2 8045 80 x 40 x 5 6.96 5.50 62.19 15.55 4.25 2.95 2.17 1.66 3.63 2.56 1.88 1.44
CW3 6584 65 x 80 x 4 10.26 8.11 64.76 19.93 4.42 3.07 2.26 1.73 3.84 2.67 1.96 1.50
CW3 6585 65 x 80 x 5 12.41 9.81 74.87 23.04 5.11 3.55 2.61 2.00 4.44 3.08 2.26 1.73
CW3 8085 80 x 80 x 5 13.93 11.00 124.39 31.10 8.49 5.90 4.33 3.32 7.26 5.12 3.76 2.88
BW1
a x x
Code axbxt Area Mass Ixx Zxx Maximum load on windpost (kN)
(mm) (cm2) (kg/m) (cm4) (cm3) Storey height posts (m) Spandrel/parapet posts (m)
3.0 3.5 4.0 4.5 0.75 0.90 1.05 1.35
BW1 1254 125 x 70 x 4 7.47 5.90 125.38 15.21 5.94 4.37 3.34 2.64 3.55 2.96 2.53 1.97
BW1 1255 125 x 70 x 5 9.23 7.29 153.60 18.78 7.28 5.35 4.10 3.24 4.38 3.65 3.13 2.43
BW1 1403 140 x 70 x 3 6.11 4.83 130.18 14.24 6.17 4.53 3.47 2.74 3.32 2.77 2.37 1.85
BW1 1406 140 x 70 x 6 11.85 9.36 246.20 27.53 11.67 8.58 6.57 5.19 6.42 5.35 4.59 3.57
BW1 1605 160 x 70 x 5 10.98 8.68 300.53 29.76 13.89 10.47 8.01 6.33 6.94 5.79 4.96 3.86
BW1 1606 160 x 70 x 6 13.05 10.31 354.15 35.32 16.48 12.34 9.44 7.46 8.24 6.87 5.89 4.58
BW1 2006* 200 x 70 x 6 15.45 12.21 650.90 53.52 24.98 21.41 17.36 13.71 12.49 10.41 8.92 6.94
*Example for extreme condition in 140 mm blockwork.
Note: any size can be made to order, i.e. all windposts are made on a project basis.
Windposts applications
Dimensioning examples
p p
Windpost ties
WPT 1 ss 70 inner &/or outer skin
WPT 3 ss 200 inner skin
Code Material Projection Brick skins tied
Abbreviations
Dimensions axbxt windpost dimensions
(see page 33)
Top fitting AC angle cleat
Structure RC concrete
SF steel
PS Pourstop
Material/finish hdg hot dip galvanised
ss stainless steel