Welded Portal Frames

Welded Portal Frames

 

R & F Welded Portal Frames are made tough to stand the test of time. We use Lysaght for the supply of our Columns, Rafters & Mullions which are then fabricated by our qualified tradesmen. The fabrication process involves mitre cutting of purlins and the addition of welded base, knee & apex connections as required.

Our Welded Portal Frames are fabricated to create a heavy, rigid steel connection. This technique is not new to the industry and continually out-performs most of the flimsy bracket designs on the market today. The welded connection system creates straight roof lines every time as the welded plates don’t allow variation to the pitch. In contrast to this, the flimsy brackets used by most shed companies take a great deal of extra work to ensure that all rafters maintain a constant pitch but can still sag due to the tolerances allowed in the oversized bolt holes.

The minimum connection plate size on our smallest sheds is 6mm thick steel compared with 2.4mm thick folded brackets used by most shed companies today.

R & F offers a full suite of services including but not limited to – Kit supply, Soil testing, Council applications, Concreting and Erection.

Welded Base Plate

R & F’s team of fabricators weld a 10mm base plate to the bottom of each Column in house. Each weld is then treated with an anti-corrosive coating to ensure longevity of the base plate and weld.

The base plate has 2 x pre-punched holes for single columns or 4 x pre-punched holes on back to back column designs. These holes line up with our galvanised cast-in slab U-bolts which are then anchored with M16 galvanised nuts and washers.

For the owner builder, we also offer an alternative of Chemset hold-down bolts to secure the baseplate to the slab. This is especially helpful for those who don’t feel comfortable correctly placing cast-in slab U-bolts whilst pouring the concrete slab.

Welded Knee Plate

 

Each Column is mitre-cut in our factory to the pitch of your roofline. At this point heavy-duty steel backing and stiffener plates are welded on the inside of the C-section Column. The thickness of the backing and stiffener plates that form a knee connection will be governed by the span, bay size, wind region and height of your building.

 

Our backing plate thickness starts at 6mm and goes all the way up to 16mm on our larger buildings. Stiffener thickness is generally 6mm. Each weld is then treated with an anti-corrosive coating to ensure longevity of the knee connection.

Welded Apex Plate

 

R & F’s welded Apex Connections are mitre-cut and welded to complete the portal frame. The minimum thickness of plate used in this connection is 6mm but plate size will be governed by the span, bay size, wind region and height your building. Each weld is then treated with an anti-corrosive coating to ensure longevity of the apex connection.

Structural Frames

Universal Beam Columns & Rafters

 

Universal Beams (or otherwise known as UB’s, I-Beams or H-Beams) are one of the heaviest and strongest methods of shed construction. We recommend hot-dip galvanising the Universal Beams so they are completely protected from corrosion. This type of design is perfectly suited to packing sheds or similar applications where large volumes of water, often corrosive, are continually coming in contact with the shed frame.

 

Member sizes are determined by our engineering team who will assess each project on a case by case basis to ensure your shed design is compliant with Australian Standards and your local wind region. The engineering team will also strive for efficiency in their design; ensuring costs are kept to an absolute minimum when purchasing your new building.

Universal Beam frames are capable of spanning up to 50m and beyond if required. They can carry immense loads if designed correctly such as gantry cranes, cold room ceilings and cantilevered awnings.

 

R & F can supply this type of building across Queensland and Northern New South Wales competitively due to the several fabrication workshops we currently have situated in different regions of Queensland.

 

This type of frame is great for commercial, industrial and larger farming purposes.

 

Universal Beam Column & Laced Rafters

This design is often more economical than full Universal Beam designs. It combines the benefits of UB Columns (eg. strength, corrosion resistance, minimal waste of internal shed space) with the more cost-efficient Laced Rafter design. Provided there is sufficient height clearance for laced rafters (as they are generally far deeper in height than their UB equivalent) than this is a more economical alternative.

 

The use of Duragal SHS to fabricate frames results in a great cost saving by eliminating the need for hot-dip galvanising or sandblasting and painting. Also, this type of rafter achieves greater spans with lighter steel quantities when compared with UB frames, which therefore reduces the cost to you, the customer.

 

Laced Frame

This is the most economical design of our three Structural Frame building types. Provided there is sufficient internal clearance for the deeper columns and rafters, this is the cheapest form of our bigger buildings.

 

The use of Duragal SHS to fabricate columns and rafters results in a great cost saving by eliminating the need for hot-dip galvanising or sandblasting and painting. Also, by achieving required heights and spans with lighter steel quantities compared with UB frames, reduces the final cost to you, the customer.