Tag Archives: concrete connections

Tag Archives: concrete connections

FAQs on our balcony connection system – The BALCON

BALCON – Balcony Connection System

BALCON is a versatile connection system for attaching steel
balconies to a reinforced concrete frame.

Check out the FAQ section from the new brochure:

Balcony Connection System BALCON

The BALCON is crafted to meet the needs of our customers who want to connect steel balconies to a concrete frame. The BALCON offers a versatile connection system that meets a range of tolerances, from the frame contractor down to the balcony specialist. It is based around JORHDAL® anchor channel technology that is over 100 years proven use in service. BALCON is an engineered product that provides a robust solution that will meet the demanding needs of the construction market, whether it is for its strength, tolerance or thermal characteristics – all of which have been independently validated.


Tag Archives: concrete connections

Connections & Fixings – Bearing Shims

Precast concrete units are commonly supported on bearing shims. These provide a means of fine adjustment of levels. Shims are usually steel, stainless if corrosion might occur, although hard plastic shims are also available.

The size of shims is determined by the bearing stress of the materials involved. Although precast concrete is usually of high strength, the supporting material may be weaker concrete or masonry. It is the weaker material that will control the sizing. Using multiple shim points is not normally an option on simple units, since the self-weight of the unit will only be taken by the two highest shim packs.


The table above gives a general guidance on the minimum bearing sizes required for various unit weights. It is based on a minimum material strength of 30 N/mm2 and assumes that 50% of the unit weight is on each shim. Shims are relatively inexpensive, and it is good practice to size shims on the large side rather than simply using the minimum. If units are stacked, then it is the total weight that must be considered.

Connections & Fixings - Bearing Shims 1Using shims of different sizes in the same stack should be avoided. Typically a shimming allowance of between 25mm and 50mm will suffice. This gap should be agreed at an early stage and shown on drawings. It is bad practice to have excessive shim height, particularly if the shims are small, as this can result in instability.

A check should also be made that the stack of shims is in line vertically as this can also cause stability problems. Continue reading