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The connection of steel balconies into concrete slabs (normally by different trades) gives rise to the need for considerable adjustability in the fixing method and the need to carry high loads whilst also minimising the effects of cold-bridging. The J-UK BALCON™, derived of JORDAHL® channels, neatly solves this design-dilemma hat-trick. BALCON™ arrangements offer multi-directional adjustment, are bespoke to each application and can also accommodate retro-fit balcony installations (e.g. for refurbishment projects).
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J&P Building Systems Ltd
Introduction
With an extensive range of products for many of today’s modern construction requirements, J & P Building Systems have developed a reputation for providing safe, smart solutions.
Supplying standard off-the-shelf products and bespoke designed solutions, J&P work closely with our parent companies to provide cost-effective, high quality and reliable products to benefit the construction industry.
Alongside our range of products we also have an experienced team providing design guidance, technical support, sales and pricing assistance – to ensure our customers are supplied the most suitable value-engineered products and solutions for their projects.
J&P Building Systems
J&P Parent Partnership Companies
J&P Building Systems is the supply partner in the UK for our parent companies
Steel balconies are a common feature of apartments
They are normally fixed to the face of the insitu concrete floor slab
Until recently, proprietary fixing systems were always used
Typical proprietary balcony fixing inserts
Apart from cost, the big drawback with these systems is tolerance
-or lack of it
Extract from proprietary technical literature
The lack of tolerance means that surveys and retro-drilling is usually required
Threaded rods projecting from slab edge
Threaded sockets cast into slab edge
Balcon channel inserts
Cast-in channel has always been known to offer high tolerance
Invented by Anders Jordahl in 1913, it has a proven track record of safety and provision of high tolerance.
In particular, channel allows considerable errors in casting to be overcome with no remedial work required.
Ideal position for channel and balcony plate
Channel to one side - plate remains in correct position
Channel too high - plate remains in correct position
Channel rotated - plate remains in correct position
Balcon system
The channels are cast-in, with bars welded-on.The stub and back plate normally form part of the balcony package
How does it work?
How does it work?
Shear is taken by the vertical toothed channels
How does it work?
Moment is taken by tension in the top channel and compression against the vertical channels
Thermal performance
The stub beam can be encased in a block of insulation.The thickness of insulation is not ‘fixed’ as with the proprietary systems.
Thermal performance
The Balcon system has been thermally assessed by BBA.
Thermal performance
The results showed that Balcon was thermally superior to existing proprietary systems.
Thermal performance
Importantly, the analysis showed that the performance meet the criteria for minimising the risk of internal surface condensation.
Durability
The channels and bolts have a hot-dipped galvanized finish. The minimum thickness of galvanizing is 50μm (microns).
The Galvanizers Association publish guidance based on BS EN ISO 14713:2009
This indicates a coating life expectancy of at least 70 years.
Practical details
BBC Media City
Practical details
BBC Media City
Practical details
BBC Media City
Practical details
Clancy Barracks, Dublin
Balcon Case studies
Woodberry Down
Balcon Case studies
BBC Media City
Media City
Balcon Case studies
The Rock, Bury
Balcon Case studies
Clancy Barracks, Dublin
Balcon Case studies
Beaufort Park, Hendon
Balcon Case studies
Kew Bridge Road, Brentford
Balcon Case studies
Finzels Reach, Bristol
Finzels Reach, Bristol
Balcon Case studies
Finzels Reach, Bristol
Finzels Reach, Bristol
Balcon Case studies
Olympic Athletes Village (3 sites)
In addition:
Cast-in channels are remarkably tolerant of mis-use and abuse, as these examples show.
Channel not secured before casting has sunk below the surface of the concrete.
Concrete is highly honeycombed
Used after load testing.
After this channel was missed out, the Contractor cut a chase in the column and ‘fixed’ a channel with resin.
Rejected!
After this channel was mis-positioned, the Contractor added another, with resin.
Rejected!
The missing concrete was replaced with grout.
Used after load testing.
This group was severely mis-aligned, and the lower surface was set back.
After load testing, this was used as designed with a modified end plate to the beam.
Inappropriate use of an oxyacetylene burner damaged the galvanizing. Concrete was blown off by the extreme heat.
After making-good, and load testing, this was used as designed.
Load = 70 kNm + 100 kN
J&P Building Systems LtdThame Forty Jane Morbey Road
Thame Oxon OX9 3RRT: +44 (0)1844 215 200 F: +44 (0)1844 263 257
E: [email protected] W: jp-uk.com
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