Column Formers

Column Formers

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.

Features

  • Manufactured to meet project specific requirements
  • Available in a wide range of materials
  • CNC machined for consistent, tolerance-controlled surfaces
  • Re-usable where columns of the same size, shape and profile are required
  • Basic, Ordinary, Plain & Special Finishes achievable*

*Please refer to National Structural Concrete Specification (NSCS) Edition 4 guidance available below.

Applications

Used for the construction of cast in-situ reinforced concrete columns with either complex or non-standard geometries, profiles and sizes.

Design

Column Formers

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:

  • Dimensions, geometry and features
  • Required concrete finish (Basic, Ordinary, Plain or Special)
  • Proposed number of uses – single or multiple
  • Loadings – specifically relating to the proposed concrete pour depths
  • External structural support method
  • Delivery method, unloading requirements and access restrictions
  • Positioning, installation and sequence of construction
  • Striking, removal and re-use or disposal


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.

Materials & Finishes

Column Formers

Typically, Cordek column formers are manufactured from one of the following material types:

  • Filcor Expanded Polystyrene (EPS)
  • Filcor EPS with a Correx skin
  • Filcor EPS with ABS skin
  • Filcor EPS with Sheet Fibreglass skin
  • Filcor EPS with a spray applied Polyurea skin
  • Glass Reinforced Plastic (GRP)

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.

Manufacture

Column Formers

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.

Downloads

Data Sheets

Product Issue Date Version Size Download
Filcor Data Sheet 03/2021 8 405.9 KB

Standard Details

Product Issue Date Version Size Download

MSDS Data Sheets

Product Issue Date Version Size Download
Expanded Polystyrene MSDS 06/2017 5 137.3 KB

Certification, Approval & Guidance

Product Issue Date Version Size Download
National Structural Concrete Specification (NSCS) Edition 4 1.2 MB

Brochures

Product Issue Date Version Size Download
Construction Solutions 01/2020 2 6.6 MB

NBS Clauses

Our NBS Clauses are hosted on the external website - view NBS Clauses

BIM Library

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Contact our Project Design Team to discuss your requirements

ProjectDesign@cordek.com01403 799600