The construction of cast in-situ, reinforced concrete columns, particularly those that require a high quality finish or a customised profile, usually involves the use of a bespoke column former.
Each former is designed to meet the specific requirements of the project including the size, shape, finish and number of re-uses. Using this information, our designers will select the most appropriate material for each former and create a 3D CAD model for approval, which, when accepted, will be used to CNC machine the finished formwork solution.
*Please refer to National Structural Concrete Specification (NSCS) Edition 4 guidance available below.
Used for the construction of cast in-situ reinforced concrete columns with either complex or non-standard geometries, profiles and sizes.
When developing a column former design, the following factors should be considered in addition to reviewing any CAD drawings, 3D models, specifications etc that are available:
Once the project requirements have been confirmed, a conceptual design can be completed along with provision of a quotation confirming proposed material type, features, quantities, manufacturing lead time and costs.
Typically, Cordek column formers are manufactured from one of the following material types:
One of the factors determining the most appropriate material used to manufacture a column former is the required concrete finish. Further information in relation to the classification of concrete finishes can be found within the National Structural Concrete Specification (NSCS) Edition 4 guidance, a copy of which can be downloaded from the Certification, Guidance and Approval section below.
Once approved, the agreed 3D CAD Model will be converted in to CAM data allowing accurate manufacture of the column former via CNC hot wire cutting and / or 5-axis routing dependant on factors such as material type, complexity of shape / profile and required tolerances.
In some instances, due to the required dimensions of the column former, it may comprise of a number of individual units that require assembly on site. This can prove advantageous in certain applications, such as casting around existing steel columns, where proprietary column formers cannot be utilised.
In cases such as these, a compressible rubber strip can be supplied at joint locations to minimise grout loss and improve the concrete finish achieved.