Hi Span Ltd
Hi-Span Cold Rolled Products have been specifically designed for use within most types of buildings as secondary supports for cladding materials.
Hi-Span offers a comprehensive range of Purlins, Rails, C-Channels, Eaves Beams and complimentary accessories.
Significant recent capital investment in the very latest "cutting edge" cold rolling plant has enhanced Hi-Span’s position as one of the UK's leading suppliers of cold rolled products to the construction industry.
The Sleeved Purlin System is easily the most popular of the three zed purlin systems available from Hi-Span Purlins achieve a high degree of continuity over the supports by employing connecting sleeves over joints. This means that design bending moments are distributed evenly along the building length, resulting in smaller section sizes and valuable economies achieved.
In the various possible arrangements of single and double span purlins, the Hi-Span sleeved system offers the customer low material costs, practical on-site advantages during erection, and excellent building performance thereafter.
Mezzanine Floor Beams
Hi-Span C-Channels are a comprehensive range of channels for a diversity of applications. Primarily for use within mezzanine floors, C-Channel sections can also be applied in many other circumstances such as door framing, roof trimming, window trimming, brickwork restraints, parapet rails and side rails.
The mezzanine floor beam depths of 127, 220, 270, and 290mm are all catered for within the range, together with channel depths of 150, 170, 205, 230, 255, 305 and 350mm, which are fully compatible with our 'Z' purlin and rail sections. While mezzanine floor beams are normally punched with 18 diameter holes as standard, 14 diameter holes are also available in these sections, together with the option of counterformed holes.
The single span design is more commonly used than the double span design due to floor depth restrictions. Please ensure that the holes in the standard MFB cleat projects far enough beyond the flange of the hot rolled member to provide adequate fixing to the C-Channel. Non standard cleats are available.
As the bottom flange of the C-Channel is usually unrestrained we recommend that a Hi-Span tubular sag rod is fitted. Where possible the channel should face toe to toe with the restraint situated in the lower gauge line holes. (Typically spans less than 3.50m do not require restraints).
Threaded Sag Bars
These 19mm diameter flow-coat galvanised and lacquered seamless tubular sag bars are preferred by many consultants and structural engineers; not only for visual effect, but also from a structural point of view. They are sturdy (0.9mm thick) and the zinc plated 12mm dia. threaded end spigots with nut and washer provide a positive fixing. (They are available in three standard lengths 20mm, 32mm and 100mm).
When Hi-Span C-Channels are used as mezzanine floor beams the MFB cleats should be used at the supports. The cleats are manufactured from a thicker material than the trimmer cleats to support the higher shear loads associated with floors. When a double span system is used, hot rolled cleats are needed in order to support the web of the channel. Fixing directly through the bottom flange of the channel to the supporting member is not recommended.
In the Sleeved Rail System, rails run past the faces of the columns, and the section depth of the rail plus the clearance required for a standard fixing cleat together determine the minimum dimension from the column face to the inside of the vertical cladding.
Joints in the rails are sleeved to give continuity, allowing the use of more economical sections and giving an improved deflection performance
Double Span Joint Arrangement.
This system combines single and double span rails with their joints staggered and sleeved. The provision of a sleeve at the unjointed connections over the penultimate support is required.
Single Span Joint Arrangement.
Apart from the penultimate support this system has sleeves at alternate joint positions. Rails must be continuous over a minimum of two spans using a sleeve, in order to create an end bay situation. (Sleeve arrangement as above, using single span rails).
The Hi-Span Eaves Beam is a versatile structural element combining the
functions of an eaves purlin and a side sheeting rail, column tie and gutter
support. Designed to cater for spans up to 12.0m, it is available in four
depths of varying thicknesses with an angled top flange giving a choice of
roof slopes 0o, 5o, 10o, 15o, 22.5o, and 30o. All design calculations are
based on a single span condition therefore removing any need for
continuity between spans. Loading combinations and section properties
are all calculated in accordance with BS 5950: Part 5 1998.
Web and flange holes can be manufactured with counter formed holes in
order to suit flush face details.