Rainbow Industrial Estate Station Approach Off Grand Drive Raynes Park SW20 0JY

POŁĄCZENIA STALI

 

Holes Web

Holes are drilled in the web of the beam to enable timber joists to be fixed to both sides. Timber joist hangers are then fixed to the beam joists, allowing floor joists to be spanned from it.

Web hole

Holes are drilled in the web of the beam to enable timber joists to be fixed to both sides. Timber joist hangers are then fixed to the beam joists, allowing floor joists to be spanned from it.

Splice 2

In some cases the structural engineer may request additional inner flange plates for the splice connection.

Splice 1

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. These bolts are expensive, so if you are told they are necessary it might be a good idea to request a redesign by your Structural Engineer to enable you to use the normal 8.8 grade bolts.

Spacer PFC

When a cavity wall needs to be supported above an opening, two PFC’s can be bolted together back to back, with a spacer inbetween, in order to give strength to the walls. The gap between the sections matches the width of the cavity, and the spacing between the bolts is 600 mm centre to centre.

Spacer 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.

Hole flange

Holes are drilled in column flanges, either UC, UB or PFC, in order to anchor them to walls and as an alternative to welding tabs. In most cases M12 anchors are used every 600 mm and in a staggered formation.

Dog leg

A ‘Dogleg’ beam is a horizontal beam with a vertical section welded at 90°. This type of beam is often used to support existing staircases.

Crank 90

A 90° crank is a typical crank but with two kinks. In a 90° crank the top member will be horizontal and the bottom vertical. Cranked beams are most frequently used to support roof structures, therefore the angle of the middle member needs to follow the pitch of the roof. It is crucial that full penetration welds are used with these connections to ensure the crank will carry the load.

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.

Top plate

A top plate is added when the size of the required beam is smaller than the wall it is carrying. An example is a door opening in a cavity wall.

Bottom plate

A bottom plate is added to a beam in order to support brickwork or timber joists. The bottom plate is stitch welded to the beam and is often offset to one side so that the brickwork is sufficiently supported.

Base plate

Base plates are used as a 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.

Fin plate

A fin plate connection consists of a length of plate welded in the workshop to the supporting member, to which the supported beam web is bolted on site, as shown in the figure below. There is a small clearance between the end of the supported beam and the supporting column. Fin plate connections.

End plate connection

This type of connection is used to join a column to a beam or another beam to a flange.

End plate 2

This type of connection is used to join a column to a beam or another beam to a flange.

End plate

An end plate is used to anchor the end of a beam to the wall, and is also part of the “End plate connection”.

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