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Reinforcement Continuity Systems

Reinforcement Continuity Systems

Ancon KSN Anchors with RT 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 RT 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.

System Components

KSN Anchor

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. 

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
RTKSN12S 115 22 M13x1.75 46 40
RTKSN12M 150 22 M13x1.75 46 40
RTKSN16S 130 28 M17x2.5 61 53
RTKSN16M 160 28 M17x2.5 61 53
RTKSN16L 190 28 M17x2.5 61 53
RTKSN20S 150 32 M21x2.5 75 65
RTKSN20M 190 32 M21x2.5 75 65
RTKSN20L 230 32 M21x2.5 75 65

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.

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