CONSTRUCTION FIXINGS
Proven safety in timber construction
HECO has received no fewer than three new approvals since the start of the year. The Schramberg based screw manufacturer has obtained European Technical Approval (ETA) for its wood screws HECO-UNIX (ETA – 11/0452), HECO-FIX-plus and HECO-TOPIX (ETA – 11/0284).
which bear the CE mark based on the EN 14592 standard, plants which manufacture ETA-approved products are subject to external monitoring, which HECO believes industry experts rate as an additional seal of quality.
I
Full-threaded screw HECO-UNIX The tensile strength of the full-threaded
screw HECO-UNIX can be calculated from withdrawal or head pull-through resistance, whichever is higher, because the full thread is located in the attachment. It is apparent based on this fact, which is stated in ETA approval ETA 11/0452, that the capacity of the HECO-UNIX in timber-timber connections is considerably higher than that of conventional part-threaded screws. The characteristic tension load of a 5mm HECO-UNIX is 2,655N given an attachment thickness of 45mm. By comparison, this value is 1,223N for a similar part-
threaded screw, which is less than half. For the craftsman, these considerably higher loads mean safer connections and easier application, as fewer mounting points are required, saving not just time but material as well.
Timber fasteners: HECO-FIX-plus and HECO-TOPIX The universal HECO-FIX-plus and the wood screw
HECO-TOPIX have been approved in ETA 11/0284 for the connection of load-bearing timber structures between wood components or between wood and steel components. The approval also covers over-rafter insulation for compression proof insulating materials (compressive strength at 10% compression of ≥ 50kpa). In addition, they may be used in pre-drilled components, facilitating their use close to the edge of the fastened material.
n receiving the ETAs, HECO once again demonstrates the high standard of quality and safety of its wood screws, which can now carry the ‘CE’ mark. Unlike screws
Better planning of façades HECO has also revamped its tried and tested
calculation program - HECO Calculation Software (HCS) and added a façade tool. Using this tool, production engineers, structural engineers and skilled tradesmen can now interactively calculate the fixing of façade elements with HECO wood screws. The new version HCS 3.0 also offers countless other innovations, all designed to facilitate the calculation of anchors, railings, over-rafter insulation and wood connections, and further enhance ease of use. The new HCS 3.0 façade tool has been designed especially for
the precise calculation of screw quantities and mounting points. What’s more, in addition to wall surfaces, it also allows users to select various roof forms, such as flat, hip, or gable roofs, thus allowing the inclusion of gable surfaces in calculations. The process is dynamic, meaning that any changes are instantly included and displayed in calculations and results. Overall, the new façade tool is based on either DIN
1052:2008-12 or Eurocode V NA Germany. This excellent range of features is rounded off by the inclusion of the new ETA approval for HECO-TOPIX screws, which further enables calculation of compression-proof insulation. Furthermore, the HCS 3.0 also adheres to the national technical approval Z-9.1-652, which enables calculation of HECO-TOPIX-Therm screws for low-compression insulating materials, as well as their use as suction screws and shear screws.
Ultra user-friendly software solution The design of the new HCS 3.0 is precisely laid out. Thanks to
a modern user interface and transparent calculation processes, sources of error can be instantly identified and eliminated. The three-dimensional representation also enables production engineers, structural engineers or façade builders to turn and swivel the construction on-screen. Changes can be entered directly and instantly viewed on-screen. Vertically arranged input fields and separate product buttons
with supplementary information (e.g., data on screws, approvals or the manufacturers of insulating materials) ensure even greater ease-of-use, as does easy access to calculation bases, equations and intermediate data. The clearly arranged results pages and printouts with 3D images also serve as a verifiable structural analysis plan or as the basis for calculation. The new software is compatible with operating systems Windows XP®, Windows Vista®
and Windows 7.
In addition to its software, HECO also offers regular HSC 3.0 training courses to its planning, dealer and trade partners.
www.heco-schrauben.de
78
Fastener + Fixing Magazine • Issue 74 March 2012
HECO-UNIX
HECO-FIX-plus
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