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Head Restraint in Concrete Application

Ancon Head Restraints

Head Restraints

Ancon Head Restraints provide the necessary restraint to the top of masonry walls. They allow for vertical movement to accommodate shrinkage or thermal movement of the wall or structural frame, while restraining wind loads.

Ancon IHR – Internal Head Restraint

The Ancon IHR is used for restraining the top of internal walls or the top of the inner leaf of a cavity wall. The channel stem is closed at the front to prevent mortar ingress and to ensure that vertical movement can take place between the blockwork and the structure.

The standard length of an IHR sliding top section will accommodate a gap of up to 50mm. Longer top sections are available to accommodate gaps of up to 75mm, ideal when a fire stop is being incorporated at the wall head or where greater deflection is expected in the floor. 

The standard Ancon IHR will suit a 215mm high block. Other stem lengths are available on request, however, longer stems may be unable to accommodate a gap above 40mm.

The sliding tie can be provided with a hole (IHR-B) or slot (IHR-V) to suit M8 bolts, with a notch end to fix directly into a 38/17 or 30/20 cast-in channel (IHR-C), and with a notch end to suit the Hammer-On section that attaches to a steel flange without site drilling (IHR-H). It is also available to suit the SDTSS-38-5PT self-tapping screw (IHR-S).

Example IHR Specification

(Delete/Amend as appropriate)

Ancon IHR-B / IHR-V / IHR-S / IHR-C30 / IHR-C38 internal head restraint to suit a 215mm block and a 25-50 / 51-75mm gap.

IHR Product Range

Design Resistances for IHR Range

Design Resistances
Product ReferenceSpacing25mm Gap50mm Gap75mm Gap
IHR-B, IHR-V, IHR-C and IHR-S 900mm 1.78kN/m 1.22kN/m 1.06kN/m
450mm 3.56kN/m 2.44kN/m 2.11kN/m
IHR-H 900mm 0.57kN/m 0.57kN/m 0.53kN/m
450mm 1.13kN/m 1.13kN/m 1.06kN/m

Ancon FHR – Head Restraint

The Ancon FHR Head Restraint is used for restraining the top of internal walls or the internal leaf of a cavity wall. The two angles clamp the top of the wall and have 10mm diameter holes to suit M8 bolts. They are supplied with two holes in the longer angle to allow the restraint to fit 100mm and 140mm blockwork. Each restraint provides a design resistance of 1890N.

NBS BIM

Building Information Modelling

For BIM Objects of these products, please click here or visit http://www.nationalbimlibrary.com/ancon

Latest News

Proud Sponsors of DISC 2018

Ancon is a proud sponsor of the 6th UK DISC (Developments in Structural Concrete) Conference, taking place at the Institution of Structural Engineers in London, on 29 November 2018.