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31/21 AXIS Curve Channel

The ACS Curve, Cast in Channel and T Head Bolt Assembly is a unique patented system. It is designed to provide support and/or restraint to secondary products that are fixed back to a concrete structure without the need for drilling and post-fixing.

The channel provides continuous adjustment along its length via the Curve T Head Bolt allowing for normal site tolerance and disassembly as appropriate. The system has been designed specifically to suit Masonry Support and Windpost applications but is a multipurpose, medium duty channel that can readily be used in various static loading applications across a range of industries.

The Curve system is typically supplied in standard three-metre lengths but can be supplied in short lengths or special welded corner, angle or radiused fabrication details to suit specific site requirements.

31/21 Channel

Application

The 31/21 Curve is a medium duty cast in channel that provides a load capacity exceeding that of a standard 38/17 rectangular channel section, and uses considerably less material. The channel is therefore a cost effective alternative to a 38/17 or other equivalent predecessors. The ACS 31/21 Curve is intended for use in reinforced concrete with a minimum compressive strength class of C20/25 or greater. The channel assembly consists of the Curve channel section, which is supplied complete with concrete anchors attached to the back of the channel profile and a specially designed T Head Bolt.

Use

The channel is fixed to the formwork prior to casting of the concrete. Once the formwork is struck the cast in channel provides a slot to allow secondary structural components to be fixed via the use of a specially designed 31/21 T Head Bolt.

The key advantages of a cast in channel include; infinite adjustment along the length of the channel whilst preventing the need for site drilling to post fix components.

The Curve System

ACS Curve Channel is available as a standard 3000mm length with crimped anchor pairs fixed at 220mm centres or stud anchors at 150mm. Alternative short lengths can be supplied for specific applications.

The Curve system also consists of a specially designed Grade A2 – 70, M12 x 50mm T head bolt. All components are designed and manufactured using Grade 304 Austenitic Stainless Steel (EN 1.4301) in line with BS EN 100088, BS EN ISO 3506 and ETAG 001.

The standard Curve system provides a permissible load capacity (FPERM) of 8.5kN in tension, shear or combined loading criteria at nominal centres and spacing in C20/25 reinforced concrete.

Cast in channels are spilt into 2 groups, self-anchoring & welded anchor types. Self-anchoring channels are predominantly used for restraint ties whilst channels with welded anchors are used for heavier loadings such as fixing masonry support. Cast in channels offer continuous adjustment longitudinally and can eliminate the need for site drilling thus reducing labour on site.

Surface fixed channels are generally used for restraint ties. They may be bolted back to masonry, concrete, steelwork and steel studding with appropriate fixings. Usually installed in continuous lengths to allow the secondary fixer continuous adjustment longitudinally when installing masonry ties.

Plain back channels may be used for supporting or restraining masonry. These channels are mainly welded to either steel columns or beams during fabrication and prior to treating the steelwork to increase the life expectancy. Plain back channels again offer continuous adjustment longitudinally and can eliminate the need for site drilling thus reducing labour on site.

Technical Data

The ACS Curve, Cast in Channel and T Head Bolt Assembly is a unique patented system, designed to provide support and/or restraint to secondary products that are fixed back to a concrete structure without the need for drilling and post-fixing. The channel provides continuous adjustment along its length via the Curve T Head Bolt allowing for normal site tolerance and disassembly as appropriate. The system has been designed specifically to suit Masonry Support and Windpost applications but is a multipurpose, medium duty channel that can readily be used in various static loading applications across a range of industries. The Curve system is typically supplied in standard three-metre lengths but can be supplied in short lengths or special welded corner, angle or radiused fabrication details to suit specific site requirements.

Installation

ACS 31/21 Curve is typically supplied in 3m lengths complete with channel anchors, nail holes and an expanded polymer foam infill, which is intended to prevent the ingress of concrete during construction. To reduce the potential for this ingress, the channel must be fixed to the formwork using all nail holes provided.
The load capacity of the channel is subject to its edge distance and spacing. The minimum and nominal spacing’s and edge distances and the systems associated load capacities can be seen in the following tables.

Allowable Loads Table

The allowable loads table provides the capacity for both direct tension and shear. Combined loads must not exceed either of these capacities and must be subject to a combined load check during calculation.

Channel Position Edge Distance (mm) Tension (kN) Shear (kN)
Nominal Edge Distance

 75

8.5

8.5

 Minimum Edge Distance

 60

6

6

 

T Head Bolt InstallationCurve and bolts

The Curve T Head Bolt is installed into the slot between the lips of the channel and rotated through 90°. During this operation, the bolt engages with the curved profile of the channel and is driven forward in the channel until the bolt locks into the front of the channel allowing ancillary components to be fixed. The bolt has a slot feature on the end of the shank to illustrate its orientation, which should be approximately vertical in its final fixed position.

Channel Anchors

ACS Curve is supplied as standard in 3-metre lengths with stud anchors at 150mm maximum centres. The channel can also be supplied with crimped strip anchors, which provides an equivalent load capacity to the standard system. ACS can also supply short lengths of channel to suit specific site applications. A table of short channel lengths and the associated anchor centres can be seen below.

Short Channel Lengths

Short channel lengths can be supplied to suit site specific applications. Alternative lengths over 350mm can be supplied in increments of 150mm with anchors spaced at 150mm accordingly or standard 3m lengths cut on site to suit.

 

Channel Length (mm) Number of Anchors per Length Anchor Spacing (mm)

100

2

 50

 150

 2

 100

 200

 2

 150

 250

 3

 100

 300

 3

 125

 350

 3

 150

All Curve channels are supplied with an anchor fixed nominally 25mm from the end to ensure that the end cantilever is kept to a minimum. When cutting long lengths on site, the channel should be cut 25mm from the centre of the last anchor to prevent excessive deflection in the end cantilever.

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ACS Stainless Steel Fixings are one of the largest and well established manufacturers of Structural Building Components in Europe.

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