What are H-block ties?

During the construction of H-block walls, there may be a need for integration or reinforcement of the wall. At this time, H-block ties are used in wall construction. H-block ties come in four types: fixed, roller, L-shaped, and radical, each with its own specific installation method. Ultimately, all ties are used to reinforce the wall against earthquakes by connecting them properly to each other and to other structural elements (such as columns and beams). In the following, we will examine these four types of H-block ties.

What is a radical (restraint) tie?

A radical tie (restraint tie) is a tie with a bending restraint (restraint part) that provides limited movement of the wall in the horizontal direction. Material: galvanized steel sheet Length: 30 cm Width: 3 cm Thickness: 2 mm Application: 1) Connecting internal and external walls to columns, ceiling, and beams in AAC walls 2) Connecting internal walls to surrounding AAC walls 3) Designed for direct screw connection to concrete for quicker and easier installation of radical restraint ties. The ties are then connected to the H-block with a 7 cm anchor bolt. Additionally, in walls constructed with H-blocks, wall integrity is achieved using thin metal ties (replacing the tie rod in walls built with mortar). The desired ties must be made of anti-corrosion steel or galvanized steel and placed in each row among the ties according to national building regulations (eighth section). The minimum cross-sectional area of the reinforcing piece is 0.0003, which is outside the wall's effective cross-section.

For connecting non-structural walls to each other, it is recommended to use galvanized radical ties to prevent tensile stresses within the non-intersecting wall surfaces. In general, the use of wall anchors is prohibited.

What is a flat tie? Another type of connection for H-blocks is the flat tie. As the name suggests, this tie is a flat metal piece with no specific protrusions, with two holes on each side for installation on blocks. Unlike roller ties, flat ties must be installed on blocks using anchors. Extreme care and skill must be applied during installation to prevent the blocks from cracking during installation. In general, the connection of H-blocks in perpendicular walls is possible with the help of these ties. Flat ties prevent wall buckling and movement during earthquakes.

The thickness of flat ties should be 20 mm according to regulations, but 10 mm ties are also produced and can be implemented with the supervisor's approval.

It is worth mentioning that due to the use of a special adhesive with a thickness of about 2 mm for H-block installation, the use of tie rod base was not feasible. Therefore, flat ties are used as a substitute for tie rod base, as shown in the image, with one tie per row for block cladding.

What is a double-sided eight-grip radical tie?

A double-sided radical tie creates a 2 cm gap between the wall and structural and non-structural members, providing a soft connection to prevent wall impact during earthquakes and avoid wall destruction. Material: galvanized steel sheet Length: 26 cm Width: 3 cm Thickness: 2 mm Application: The double-sided radical tie is used for eight-grip surrounding and internal walls. The radical ties are used to connect two walls together (replacing wall anchors). By creating a 2 cm gap between the wall and structural and non-structural members, a soft connection is established to prevent wall impact during earthquakes and avoid wall destruction. The installation method of radical ties in concrete structures involves screwing and welding, while in metal structures, they are welded. It is important to note that connecting radical ties to structures using riveted connections is prohibited due to the risk of damaging structural elements (such as concrete columns). Instead, screw connections (drilling holes and connecting with screws and anchor plates or anchor bolts) should be used. Double-sided ties are produced by H-block connection manufacturers nationwide.

One of the most mechanized and high-quality companies producing and supplying base tie rods, wall posts, and H-block connections is Aroosha located in Alborz province. Aroosha has started producing various standard galvanized and colored wall posts, galvanized base tie rods with widths of 5.5, 11, and 15 cm, radical ties, flat ties, H-block connections, etc., to comply with national building regulations and improve engineering services, increase the safety factor of structures, and enhance construction industry quality standards. Subsequently, to facilitate quick and direct purchase of construction materials, Aroosha has launched an online store for construction materials.

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