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A Wide range of connections

Connections are structural elements that are used for joining different members of the structural steel framework.

The steel structure is comprised of different sections i.e beams, columns, rafters etc. The connections are an important part of the steel structure and are designed more conventionally than any individual members.

Connection types

Moment Connection

A moment connection features an overhanging plate that bolts into a column. This type of connection is often used when the connection needs to withstand a high ‘moment’, for example, if a wall is replaced with a box frame that will need to withstand high wind loads from the sides.

ANGLE CLEAT

A cleat is used to bolt one beam into the side of another beam. Cleats are made from RSA sections (angles), which are then bolted to both beams. In cases where only one side needs bolting, only one cleat will be required, and for some projects, it is preferable to weld the cleats to the end of a beam rather than bolting them.

TWIN BEAM

When projects are struggling for height, for instance in basements and lofts, it is often preferable to replace a deep beam with two smaller beams. However, to ensure stability and resistance to buckling, these beams need to be bolted together, and this is where a spacer is used and is usually welded to one of the beams. The bolts are typically 600 mm apart from each other.

BOTTOM PLATE

A bottom plate is often used to support timber joists or brickwork.

Flange Plate Connection

Flange plate are welded to the end of the UC,UB and PFC beams.

TOP PLATE

A top plate is added to a beam to support brickwork.

BASE PLATE

Base plates are used as support for columns coming off a concrete pad or foundation. To ensure longevity and stability, it is essential to leave a gap of around 20 – 30 mm between the concrete and the steel plate, which can be achieved using shims and wedges. This gap will then need to be filled by packing a dry mixture of concrete, also known as a dry-pack, into the gap.

FLITCH PLATE

A flitch beam (otherwise known as a “flitched beam”) is a compound beam made up of a steel plate(commonly referred to as a “flitch plate”) and two timber beams. The steel plate is sandwiched between the wooden beams, with the three alternating layers being held together using bolts.

Spliced connection

Splices are required when a beam is either too long or too heavy to install safely. When a beam spans two party walls, a splice is also recommended to easily install the beam, with the alternative being temporarily removing a large wall section. As a rule of thumb, the flange plates need to be at least the same thickness as the beam’s flange, and the same rule applies to the web plates. In some cases, HSFG (High Strength Friction Grip) bolts are required, in which case the beam ends and the splice plates must not be primed.

End Plate Spliced Connection

This connection is often used loft extensions.

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