Reinforcement Continuity Systems
Ancon KSN Anchors with BT threaded reinforcing bars can simplify concrete design at construction joints, typically in wall-to-slab applications. The anchor is cast into the face of the concrete wall. When the formwork and thread protection is removed, the reinforcing bar is screwed into the anchor. Once all other reinforcement is installed, the adjoining slab is cast to complete the installation.
Independent tests have verified the enhanced performance specifically offered by Ancon KSN Anchors when used in slab-to-wall moment connections.
Our research enables engineers to design construction joints without the restrictions of traditional continuity systems or the awkward anchorage lengths demanded by reinforcing bar couplers.
- Design freedom
- Enhanced performance
- Independently tested
- Variable bar length
- Variable anchor spacing
- Less congestion
- Safer, faster installation
- No bar straightening
The use of Ancon KSN Anchors with BT threaded reinforcing bars can simplify concrete design at construction joints, typically in wall-to-slab applications.
The anchor is cast into the face of the concrete wall. When the formwork and thread protection is removed, the reinforcing bar is screwed into the anchor. Once all other reinforcement is installed, the adjoining slab is cast to complete the installation.
This system eliminates the drilling of formwork or concrete and the dangers associated with projecting bars and on-site bar straightening. It replaces cogged or hooked bar ends simplifying bar scheduling and can be used to minimise congestion in the wall.
In addition to their use in direct tensile applications, KSN Anchors have been independently tested in moment connections where they provide enhanced performance.
KSN Anchors may also be suitable for other applications where a cast-in threaded insert is required.
The KSN Anchor is machined from tough, high reliability, hot forged Cr-Mo alloy steel, with minimum 15% elongation, to form a blank that is subsequently hot forged to form the head. The anchor head exceeds the requirements of AS3600.
There are eight anchors in the KSN range to suit the requirements of most applications.
KSN Threaded Anchor Dimensions
|Anchor Ref.||Anchor Length mm||Nominal External Diameter mm||Metric Thread mm||Nominal Head Width mm||Nominal Head A/F mm|
KSN Anchors are designed for use with 12mm, 16mm and 20mm grade 500 reinforcing bar, threaded with a BT metric thread. The BT system produces a full strength joint. The bar end is cut square and enlarged by cold forging. This increases the core diameter of the bar to ensure that the strength of the bar is maintained. A parallel metric thread is cut onto the enlarged bar end. A 12mm bar is provided with an M14 thread, a 16mm bar with an M20 thread and a 20mm bar with an M24 thread. The threaded ends are protected by an external plastic sheath.
Standard BT Continuation Bar Dimensions
|Anchor Ref.||Bar Diameter||Thread Size||Thread Length||Rebate Depth||Length 40D||Total Length|
Other bar lengths are available. Please refer to AS3600 section 13 for additional guidance.
KeyBox and MomentBox Metal Casing
A galvanised steel casing can be supplied with KSN Anchors installed at the specified design spacing. The unit is sealed at each end to prevent the ingress of concrete and the steel is dimpled to provide a key for the concrete. Upon removal of the formwork, the casing remains embedded in the wall with the cover in place to prevent thread contamination. The cover is removed to install the threaded bars and the rebate formed by the boxes is filled with concrete when the adjoining slab is poured. This method provides KSN Anchors with an additional 36mm of embedment making it the highest load capacity installation method available, and suitable for moment connections.
KeyBlock and MomentBlock Reusable Mould
This is a reusable plastic mould that is provided with mountings for the KSN Anchors at the specified design spacing. The blocks are loaded with KSN Anchors and fixed to the formwork where required. The block protects the internal threads of the anchors until it is removed, so should be left in position until this time. Once removed, the block may be reloaded with KSN Anchors ready for use on the next set of formwork or may be retained for use on future projects. The block provides the KSN Anchor with 5mm of additional embedment by offsetting it from the formwork face. This offset and surrounding rebate increases the capacity and makes this installation method suitable for moment connections.
Performance data for this system and information on specifying and ordering is given in the 'KSN Anchors' brochure available to download below.
KSN Anchors Reinforcement Continuity System (PDF, 2.96 MB)
Ancon is exhibiting at the 2016 NZ Bridges Summit on 1st - 2nd November in Auckland. The conference is endorsed by the NZ Transport Agency (NZTA) and we will be showcasing our BT range of threaded reinforcement couplers, our MBT range of bolted couplers and various Lifting Systems including our brand new EdjPro Narrow Anchor system.
Having recently identified issues with the performance of some batches of reinforcing steel supplied to us, we have introduced batch testing for all reinforcement used in combination with our BT coupler system in New Zealand to ensure compatibility.