Innovation: BT Q anchor for building with thin walls

The BT Q anchor was developed to transfer maximum possible shear and tensile forces into concrete elements. It is an embedded part and is installed prior to casting and is then embedded, An approval of the anchors in the form of an ETA has been applied for.

Redistribution  of force effect

The currently used anchor consists of a sleeve and an anchorage part, e.g. a pin. In conventional anchors, all loads are always transferred via the central sleeve directly into the surrounding concrete. For that reason, concrete break-out failures begin primarily at the sleeve.  In order to be able to transfer high forces, the anchors must be covered with much concrete. By attaching wings to a headbolt sleeve anchor, the loads transferred into the  sleeve can be transferred more deeply into the structural element. However, of disadvantage would be that uncoated load transfer surfaces would apply pressure on the concrete in the direction of shear force and in this way could lead to premature crack formation in the concrete. In order to allow such crack formation only under very high loading, the anchor is selectively encased with an elastic layer. Selective rubber coating causes the outer sides, the wing arms and the sleeve, to become decoupled from the surrounding concrete and are therefore unable to assert pressure on the concrete.