Concrete Anchor

The term “anchor” covers several groups of fasteners designed to secure structures to bases made of concrete, brick, natural stone, and other hard materials.

Anchor-type bolts are installed in foundations, walls, interior partitions, and floor/ceiling slabs.

Anchors can be used to mount metal beams of various cross-sections, suspended ceilings, timber for floors or ceilings, staircases, machine equipment, wall-mounted cabinets, boilers, and radiators.

Description

An anchor is a composite metal rod with a threaded shank, onto which a lock washer is fitted and a nut is tightened (anchors with a hook or ring are also available). The opposite end has a conical thickened section. A required element of the product is the expansion part, which secures it within the concrete. The main dimensional characteristics of the bolt are the thread diameter (from M6 to M28) and the length (60–300 mm).

Classification of anchors and installation features

Depending on the method of holding suspended structures, concrete anchors are divided into two large groups.

Mechanical

They work by means of friction force and come in three types.

• Drop-in anchors. Consist of a rod with external thread and a split sleeve with internal thread of the same diameter. The sleeve is inserted into a pre-drilled hole, the bolt is screwed in, the end is struck firmly with a hammer, a washer is fitted, and the nut is tightened. This type is used for lightweight structures.
• Wedge anchors. This is a modification of the drop-in anchor that increases its holding capacity. Elongated rod-type wedge anchors are used for mounting multilayer cladding.
• Expansion anchors. Reliable products most often used in construction and industry for mounting heavy equipment. These anchors have a special wedge that helps the expansion sleeve open. Double-expansion bolts with a dual sleeve are considered the most effective.