Construction products detail

Other anchorages and fixings for use in concrete and masonry include, e.g. post-installed rebar connections, internal threaded sockets, sandwich panel anchors, wire rope loop systems, facade panel anchors, renovation fasteners, shear connectors and autoclaved aerated concrete fasteners or diagonal brace fixings.

Post-installed rebar connections are composed of reinforcing steel and an injection mortar. They are inserted into pre-drilled holes and are bonded to the concrete. Post-installed rebar connections may be applied in the same way as embedded straight reinforcing bars, e.g. for lap joints with the reinforcement existing in the member or for anchoring the reinforcement to the support of slabs or beams.

Internal threaded anchors consist of an anchor in combination with an internal threaded socket. Anchor and socket are made of steel. The anchor is embedded flush with or recessed with respect to the surface of the concrete. Anchoring is achieved via mechanical form-fitting of the anchor in the concrete. The socket can be used for the post-installed connection of structural steel components to reinforced concrete members.

Sandwich panel anchors are made of wire or sheet metal and can have various forms, e.g. hooks, loops, flat sheets or round sheets. Anchor bars can also be made of glass fibre reinforced plastic. Sandwich panel anchors are used for connecting the facing leaf to the load-bearing leaf of three- or four-leaf reinforced concrete wall panels. The reinforced concrete wall elements can be designed as sandwich walls (precast) or cavity walls (semi-precast).

Wire rope loop systems consist of connecting channels and grouting mortar. The connecting channel consists of a casing made of a corrugated galvanised sheet metal in which flexible high-strength wire rope loops are arranged. The connecting channel is installed in precast reinforced concrete walls and as permanent formwork acts together with the surrounding concrete. Wire rope loop systems are used for connecting or tying of precast reinforced concrete walls and precast reinforced concrete columns as well as cast-in-place concrete walls.

Facade panel anchors are made of steel and serve to fasten prefabricated facade elements to a load-bearing wall made of reinforced concrete. The anchors can be embedded in concrete or connected to other anchoring systems.

Renovation fasteners are bonded fasteners or plastic fasteners for post-installed anchoring of outer masonry leaves to the load-bearing leaf made of concrete or masonry or bonded anchors for post-installed anchoring of the rainscreen to the concrete load-bearing leaf.

Shear connectors are used for the post-installed connection of existing concrete with a concrete overlay. They consist of headed steel parts. The steel part is anchored in the existing concrete as a bonded or metal fastener. The connector is anchored in the new concrete (overlay) via the head by means of form-fitting.

Autoclaved aerated concrete fasteners are deformation-controlled expansion fasteners made of steel. The fastener consists of an internal threaded socket, a conical bolt and an expansion sleeve. The loads are transmitted into the autoclaved aerated concrete through a form fit. The fastener is inserted into a pre-drilled hole and tightened with a setting tool. The attachment part is mounted with a fastener (threaded rod or screw).

Regulatory framework

DIBt grants national technical approvals (abZ) for these and other anchors, fasteners and reinforcements.

European Technical Assessments (ETAs) can also be issued. Relevant European Assessment Documents are already available for post-installed rebar connections, cast-in anchors with internal threaded socket and metal expansion fasteners for use in autoclaved aerated concrete.

Furthermore, DIBt grants general construction technique permits (aBG) for construction techniques comprising anchors, fasteners and reinforcements for which there are no conclusive technical rules.

Please also refer to the applicable design and execution rules, cf., in particular, MVV TB, Part A 1, as well as the following information and technical rules. For post-installed rebar connections and internal threaded sockets, please also refer to MVV TB, Annex 1.