STANDARD HOLES
The majority of connections in the Duggan Prosigma system are designed around the use of M12 bolts fitting through 14mm holes. In certain instances where M12 is not deemed adequate M16 bolts fitting through 18mm holes are used (The Eaves Beam Cleat connection to the mainframe is an example). Both 14 & 18mm holes are produced as standard and these may be punched at any position across the width of the blank strip, in other words punching is not limited to standard gauge lines.
SLOTTED HOLES
Standard horizontal slot lengths are 14 x 4 and 14 x 40 as shown but any slot length may be achieved using multiple iterations of these punches.
14mm vertical slots may be achieved by nibbling using a series of closely spaced 14mm holes. 18mm slots, both horizontal and vertical may also be produced by nibbling using 18mm round holes. Slots may be punched at any position across the width of the strip.
SERVICE HOLES
A round 60mm diameter hole may be provided on the centreline of selected sections to accommodate the provision of services such as ducting, pipes, cabling etc. The sections in question include Sigma+ sections of 235 or greater and all Cee sections.
NOTCHING
Sigma, Cee and Eaves Beam profiles can be notched. The minimum length of notch is 60mm. A member may be notched from either side or from both, if notching from both sides the depth may be different on either side. The notch must start at the edge of the strip.
End Flanges
In situations where loading and other factors permit End Flanges may be used instead of cleats/brackets as a cost effective jointing solution. An end flange is formed from the parent material of the member in question by notching the end and folding the remaining tab. The end flange may be punched to allow for a bolted connection or folded unpunched to act as an end closure. Please note end flanges are available on Cee sections only.
End Flange direction: End Flanges may be formed inward or outward as indicated in the diagrams below. Flanges folded “IN” are the most commonly used type.
COUNTERFORMING
Counterforming of either 14 or 18mm holes may be provided and is generally applicable to Cee sections only. Please contact Duggan Profiles before considering the use of counterformed holes on sections other than Cee’s. The overall depth of the counterform varies with material thickness and should be obtained from samples if critically important. Indicative dimensions are shown on the diagram below.
