Uutisarkisto Scaffolding manufactured from high strength steel
28.10.2004 14:32 CET

Scaffolding manufactured from high strength steel

Scaffolding manufactured from high strength steel Lower weight and simpler to use - the new, latest design of scaffolding manufactured from high strength steel by Haki is around 25 percent lighter than earlier systems. Due to its low weight, the new high strength steel scaffolding will also be able to replace many of the aluminium scaf-folding systems now available on the market. The new design has been developed to meet the needs of the offshore industry for safer scaffolding systems for maintenance work on drilling platforms in the North Sea. It has also turned out to be a boon to the manufacturer's operations as Haki has been nominated for the international Swedish Steel Prize 2004, awarded for the world's foremost design for which high strength steel is used. Haki - which is a specialist company in scaffolding systems - launched an in-house programme aimed at reducing the weight of the company's steel scaffolding systems. The target was to reduce the weight by about 20 - 25 percent, and this target has now been reached. The driving force behind the development was to meet the need for durable and lightweight scaffolding systems for maintenance work on oil drilling platforms in the North Sea. Low weight is crucial for scaffolding intended for oil drilling platforms, due to their limited storage and load-carrying capacities. Aluminium scaffolding, which is sufficiently light but very expensive to produce, currently dominates in the offshore industry. However it is more sensitive to damage from impact and is also less resistant to fatigue than steel scaffolding. This reduces the feeling of security for those working on scaffolding, which is often suspended from the platform, with ice-cold open water immediately below. "The new lightweight scaffolding systems we developed had to meet many demands," recalls Bengt Olsson, Managing Director of Haki AB. "In the early days of the project, we tested various materials, but we soon realised that the future lay in high strength steels, particularly since the availability of high strength steel tube has improved radically in recent years." In addition to changing to high strength steel for the scaffolding, the design has also been modified, contributing further to the reduction in weight and includes the clips between the standards (the vertical tubes of the scaffolding). The previous clips were heavy and had welded supports to carry the load ap-plied from above. The new standards are manufactured from high strength steel tube with a minimum yield strength of 400 Nm/mm2 and have folded joints. Due to the high strength of the material, the tube walls are thinner, having been reduced from 3.2 mm to 2.7 mm, which is the minimum it can be. Press-ing is carried out in one operation, with one end shrunk and folded to replace the previous welded sup-port. The scaffolding components are produced in a special machine developed in-house by Haki. "This machine is at the heart of our production system, and just how we go about shrinking the hard steel is our well-kept secret," continues Bengt Olsson with a smile, while making certain that no one comes anywhere near the equipment that produces the new standards at a brisk pace. "The new design enables us to save a great deal of time in production, and the result is a much better product with a very close fit." A very close fit in the joints and other parts is of major importance to ensure sturdiness and safety in the erection of scaffolding. The Haki scaffolding system can be erected to a height of 200 metres and must therefore be very strong to withstand the stresses imposed. Another component that has been developed is the location of the clips on the standards onto which the ledgers (horizontal tubes of the scaffolding) are hooked. A symmetrical design has been produced, which makes it easier to erect the scaffolding. The change in design has also contributed to more efficient and profitable production, with simpler stock-keeping of standards for customers. Other major components of the system - the horizontal transverse tubes (putlogs) and longitudinal tubes (ledgers) supporting the decking are also manufactured from high strength steel with a minimum yield strength of up to 600 N/mm2. "We have achieved the targets we set ourselves, although we intend to go much further in reducing the weight of our products," declares Ulf Oskarsson, who is responsible for technology and production at Haki. "High strength steel is a secure and reliable material, with properties that ensure safety and good economy. We have other new components to develop, both in our scaffolding system and in working platforms and construction site lifts. Our new competence and capacity has strengthened our position in the market. This gives us the energy to forge ahead." The most important benefit of the new lightweight system that both Bengt Olsson and Ulf Oskarsson immediately highlight is that the system is better for the users. A quick calculation shows that the daily load that a scaffolding erector must handle is reduced by more than 400 kilos when the new high strength steel system is used. "Wear injuries are reduced, the work is easier, and employers can expect better profitability in the long term, as personnel remain more healthy," concludes Bengt Olsson. Haki AB was founded back in 1956, and the company's Head Office and part of the production facili-ties are located in the small community of Sibbhult in southern Sweden. The company is currently owned by Midway Holding AB, and has subsidiaries and sales offices in Finland, Denmark, Norway, Great Britain and France. Sales elsewhere in the world are handled by agents. Caption: Simpler, lighter and stronger. The new Haki lightweight system of scaffolding manufactured from high strength steel has recorded major successes on the market and has led to the company being nominated for the Swedish Steel Prize 2004. For further information on the Swedish Steel Prize, please visit www.steelprize.com For texts and digital photographs please visit www.swedishsteel.co.uk or www.ssabtunnplat.com . For additional information please contact: Cecilia Dalén Public Relations Manager SSAB Tunnplåt AB Marketing Communications Tel: +46 8 679 17 67 Mobile: +46 70 648 80 72 Fax: +46 8 611 20 89 E-mail: cecilia.dalen@ssab.com Facts about SSAB Swedish Steel: SSAB Swedish Steel is Scandinavia's largest steel manufacturer and is one of the world's leading manufacturers of high-tensile steel. The product range within the steel sector is limited to sheet and heavy plate. The steel sheet production is operated within SSAB Tunnplåt and the heavy-plate operations within SSAB Oxelösund. The number of employees is 9,300 and the total production amounts to 3.6 million tonnes. Annual sales are about SEK 20 billion. ------------------------------------------------------------ This information was brought to you by Waymaker http://www.waymaker.net The following files are available for download: http://www.waymaker.net/bitonline/2004/10/28/20041028BIT21420/wkr0001.pdf http://www.waymaker.net/bitonline/2004/10/28/20041028BIT21420/bild.html Pictures