Connection Systems Jordahl Balcon
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Transcript of Connection Systems Jordahl Balcon
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J&P Building Systems Ltd
Introduction
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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
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J&P Parent Partnership Companies
J&P Building Systems is the supply partner in the UK for our parent companies
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Steel balconies are a common feature of apartments
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They are normally fixed to the face of the insitu concrete floor slab
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Until recently, proprietary fixing systems were always used
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Typical proprietary balcony fixing inserts
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Apart from cost, the big drawback with these systems is tolerance
-or lack of it
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Extract from proprietary technical literature
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The lack of tolerance means that surveys and retro-drilling is usually required
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Threaded rods projecting from slab edge
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Threaded sockets cast into slab edge
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Balcon channel inserts
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Cast-in channel has always been known to offer high tolerance
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Invented by Anders Jordahl in 1913, it has a proven track record of safety and provision of high tolerance.
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In particular, channel allows considerable errors in casting to be overcome with no remedial work required.
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Ideal position for channel and balcony plate
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Channel to one side - plate remains in correct position
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Channel too high - plate remains in correct position
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Channel rotated - plate remains in correct position
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Balcon system
The channels are cast-in, with bars welded-on.The stub and back plate normally form part of the balcony package
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How does it work?
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How does it work?
Shear is taken by the vertical toothed channels
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How does it work?
Moment is taken by tension in the top channel and compression against the vertical channels
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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.
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Thermal performance
The Balcon system has been thermally assessed by BBA.
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Thermal performance
The results showed that Balcon was thermally superior to existing proprietary systems.
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Thermal performance
Importantly, the analysis showed that the performance meet the criteria for minimising the risk of internal surface condensation.
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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.
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Practical details
BBC Media City
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Practical details
BBC Media City
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Practical details
BBC Media City
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Practical details
Clancy Barracks, Dublin
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Balcon Case studies
Woodberry Down
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Balcon Case studies
BBC Media City
Media City
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Balcon Case studies
The Rock, Bury
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Balcon Case studies
Clancy Barracks, Dublin
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Balcon Case studies
Beaufort Park, Hendon
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Balcon Case studies
Kew Bridge Road, Brentford
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Balcon Case studies
Finzels Reach, Bristol
Finzels Reach, Bristol
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Balcon Case studies
Finzels Reach, Bristol
Finzels Reach, Bristol
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Balcon Case studies
Olympic Athletes Village (3 sites)
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In addition:
Cast-in channels are remarkably tolerant of mis-use and abuse, as these examples show.
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Channel not secured before casting has sunk below the surface of the concrete.
Concrete is highly honeycombed
Used after load testing.
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After this channel was missed out, the Contractor cut a chase in the column and ‘fixed’ a channel with resin.
Rejected!
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After this channel was mis-positioned, the Contractor added another, with resin.
Rejected!
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The missing concrete was replaced with grout.
Used after load testing.
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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.
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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
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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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