It is often necessary, already during erection of a structure, to install various equipment on the surface of this structure. This equipment may span hanging scaffolding, single-side formwork, slip formwork, and many other types of devices, which require anchoring in the structure surface.Anchoring equipment to structural components is done using various kinds of anchors using FCMB and FCB cones.
A cone, together with the anchoring component, allows single-side attachment of equipment to the structure. The figures show one of the anchoring methods (anchor with plate). The main anchor joint with the part to be affixed is the cone, with the cone strength being equal to the anchor strength.
The installation of the anchor begins with installing the FCB installation grip to the formwork panel, or, in case of the FCMB cone, the M24 installation grip.The point of placement of the grip in the formwork panel is the point where i. e. a working platform will be attached. A cone is attached by a threaded connection to such a grip. The cone is tightened by hand until we feel resistance. The final step during preparation of the anchor is attaching the anchor element to the cone using the threaded connection. In the image, the anchoring component is an anchor with a plate. After concreting is complete and the formwork is removed, the installation grip is removed from the cone, and then the concrete reaches strength corresponding to the class of at least C15/20 (B15), one can commence attaching the hanging equipment.In order to attach such equipment, one uses (in case of using the FCMB cone) M24 hexagonal head reamer bolts (according to Polish Standard PN-EN ISO 4014:2004), property class 8.8 (according to PN-EN ISO 8981). The bolt length should be selected considering the cone thread length (44 mm) and the thickness of the element to be attached.After removal of the equipment, the cone is screwed away off the surface of the component counter-clockwise. There are special-purpose wrenches used to do this. The last stage is plugging the cone openings. This can be done using special mortar or by way of a ready microfibre-reinforced concrete plug, to be glued in the opening using the A+B two-component adhesive. During plugging the opening pay particular attention for the joined surfaces to be free of dust and fat.Plugging the opening with a concrete plug using the A+B adhesive note for the adhesive to fully envelop the space between the plug and the opening. A practical way to do this is covering the contact surfaces of the plug with the adhesive, and then placing the plug in the opening, slightly twisting it in order for the adhesive to completely fill the crease. Do not let the adhesive drip out of the opening, and any possible excess should be gathered up with a trowelThanks to reliably selected and tight-fitting anchor components as well as additional material, which together, as a system, shall ensure a tight joint between the structure and the component to be suspended, you guarantee for yourself high work safety. Keep in mind, however, that structural issues and retail issues as well cause the length of the components anchored in the concrete not to always guarantee full transfer of forces to the concrete, threatening damage to the anchor zone. The anchored (stay-in-place) components should be selected keeping the shape of the structural component, in which the device is to be anchored, in mind, along with the relevant dimensions, assembly space, and above all - requirements of statistics (of statics). For this purpose, in numerous cases, in situations of greater loads, the forces from the anchors should be transferred to the concrete by reinforcement inlays.
Sample use of single-side anchors
Sample use of the FCMB cone with anchoring.
Sample use of the FORBOLD-C sleeve anchor.
Sample use of the M24 anchoring component.
Sample use of the B15 expansion anchor.
Sample use of the loop anchor with the FCB B15 plastic-metal cone during assembly of the expansion supports.
Sample use of the FORBOLD-F grip during execution of an external wall using stay-in-place formwork.