Anchor bolts - Eyelet bolts

Anchor bolts are a kind of special bolts used to fix equipment, structures, etc. to the foundation. The following is detailed information about anchor bolts:

Structural Characteristics of Anchor Bolts

Shank: Usually, it is a high-strength metal rod with threads on the surface, which is used to cooperate with nuts for fastening. Its length can be long or short according to different usage requirements, generally ranging from dozens of centimeters to several meters.

Anchoring End: This is the key part where the anchor bolt is connected to the foundation. Common shapes include hook-shaped, straight-bar-shaped, conical, etc. The hook-shaped anchoring end can increase the anchoring force of the bolt in the foundation and prevent the bolt from being pulled out; the straight-bar-shaped is suitable for some occasions where the requirement for anchoring force is not high; the conical anchoring end can better adapt to different types of foundation materials and improve the anchoring effect.

Head: Generally, it is square or round and is used to fix equipment or structural components. There are usually holes or grooves on the head, which makes it convenient to connect the equipment to the anchor bolt using nuts and washers.

Specification Dimensions of Anchor Bolts

The diameter of anchor bolts usually ranges between M6 and M48. Common specifications include M10, M12, M16, M20, M24, M30, etc. The larger the diameter, the stronger its bearing capacity.

In terms of length, it ranges from dozens of millimeters to several meters. For example, the anchor bolts used for fixing small equipment may only be 50 - 100 millimeters long, while the length of anchor bolts used for fixing large industrial equipment or building structures may reach 1 - 3 meters or even longer.

Materials and Surface Treatments of Anchor Bolts

Materials: Generally, medium carbon steel or medium carbon alloy steel is used, such as No. 45 steel, 35CrMo, etc. After appropriate heat treatment, these materials can obtain high strength and toughness and can withstand large tensile and shear forces. For some special environments, such as places with strong corrosion, anchor bolts made of stainless steel are used to improve their corrosion resistance.

Surface Treatments: In order to prevent anchor bolts from rusting and corroding during use, surface treatments are usually carried out. Common treatment methods include hot-dip galvanizing, electro-galvanizing, painting, blackening, etc. Hot-dip galvanizing treatment can form a thick zinc layer on the surface of the bolt, which has good anti-rust performance and is suitable for most outdoor or humid environments; the surface of electro-galvanizing is relatively smooth and has high aesthetic value, but the thickness of the zinc layer is relatively thin, and its anti-rust ability is slightly inferior to that of hot-dip galvanizing; painting treatment allows the selection of different colors of paint according to needs, which can not only prevent rust but also play a certain marking role; blackening treatment is mainly used in some occasions where there are not high requirements for appearance but a certain anti-rust ability is needed.

Application Fields of Anchor Bolts

Industrial Equipment Installation: In factories, the installation of various large mechanical equipment such as machine tools, generators, compressors, speed reducers, etc. all requires the use of anchor bolts. By fixing the anchor bolts in the concrete foundation and then connecting the equipment to the anchor bolts, it can ensure that the equipment remains stable during operation and will not shift or shake due to reasons such as vibration and impact.

Building Structure Fixing: In construction projects, anchor bolts are used to fix structural components such as steel structure columns, concrete columns, and bridge bearings. They transfer the load of the upper structure to the foundation, ensuring the safety and stability of the building structure. For example, in the installation of the steel structure of high-rise buildings, anchor bolts are the key components connecting the steel columns to the foundation, and their installation accuracy and anchoring quality directly affect the structural safety of the entire building.

Power Facility Installation: Anchor bolts are also indispensable in the foundation construction of power facilities such as utility poles and transmission towers. They fix the poles and towers on the ground, bearing the weight of the poles and towers as well as the tension of the wires, ensuring that the power facilities can operate normally under various meteorological conditions.

Installation and Precautions of Anchor Bolts

Installation Method: First, holes for anchor bolts need to be reserved on the foundation according to the design requirements. Then, put the anchor bolts into the holes, adjust the position and perpendicularity, and fix them using templates or fixtures. Next, pour concrete to make the anchor bolts closely combined with the foundation. During the concrete pouring process, care should be taken to avoid the displacement or inclination of the anchor bolts. After the concrete reaches a certain strength, connect and fix the equipment or structural components to the anchor bolts through nuts and washers.

Precautions: When installing anchor bolts, strictly control their position and perpendicularity, and the deviation should meet the design and specification requirements. Otherwise, it may lead to uneven installation of the equipment, affecting its normal operation, and may even cause additional stress on the equipment, shortening the service life of the equipment. At the same time, when pouring concrete, ensure the quality of the concrete and the pouring process, and avoid defects such as honeycombs and pitted surfaces to ensure the anchoring force between the anchor bolts and the foundation. In addition, during the equipment installation process, tighten the nuts according to the specified torque to prevent the anchor bolts from loosening.