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Foundation Bolt

Foundation Bolt from AGICO

Foundation anchor bolts refer to the bolts that connect equipment to the foundation through a base. Typically, anchor bolts are positioned and fixed before pouring the equipment foundation. After pouring, they form a stable connection with the foundation. In some cases, holes are pre-drilled in the foundation during pouring, and the bolts are poured into the holes after the equipment is in place, installed, and leveled. For smaller equipment, holes may be drilled in the foundation, and expansion bolts are used for securing.

Foundation Bolt Types:

Foundation bolt is embedded together with the foundation (one side of the bolt is embedded in the concrete, thus ensuring high stability). It is used to secure equipment that does not experience intense vibration and impact. AGICO supplies straight hook (I shape) bolts, bent Type anchor bolts ( L, J, eye, U ), Weld Type Anchor Bolts: claw-type bolts, plate anchor bolts.

L Foundation Bolt

JB4364 refers to JB/ZQ 4364-2006, it is a type of L shape foundation bolt, it is also known as 7 shaped and right-angle anchor bolt. There are various styles of anchor bolts, but this type is commonly used. In the initial design of steel structures, this type is usually given priority, especially in large-span steel structure factories. The foundation for such structures typically uses the 4364 anchor bolts. These products have good comprehensive performance, cost control is easy, they are easy to process, and have fast delivery. When constructing rapid-assembly structures within tight deadlines, using these bolts can shorten the corresponding construction period and accelerate project progress.

During the process of embedding the foundation, the anchor bolts can be individually embedded or welded to positioning steel plates to form anchor cages. This approach can avoid issues of inaccurate positioning and improper installation in later stages. The specification and dimension readings of a 7-shaped anchor bolt can generally be divided into four parts: thread diameter, height, hook length, and thread length. The thread diameter is usually between M12 and M72.

J-Type Anchor Bolt

DL/T1236 Anchor Bolt is a standard established by the power sector. The standard code is “DL/T 1236-2013 Anchor Bolts and Nuts for Transmission Towers.” This standard specifies five styles of anchor bolts and their corresponding nuts. The anchor bolt style shown in the image is the J-Type Anchor Bolt, commonly used for embedding and securing in power transmission towers, steel structure engineering, chemical industry, pressure vessels, lamp poles, surveillance poles, advertising boards, and other applications.

Plate Anchor Bolt:

Plate anchor bolts are large-diameter embedded bolts. The manufacturing process for anchor plate anchor bolts is slightly more complex compared to other embedded components. They are made by welding the embedded screw, embedded base plate, and stiffeners together. When embedded and the concrete is cured, they can provide significant anchoring performance and strong tensile resistance.

Plate anchor bolts, also known as anchor bolts with stiffeners, are widely used in the chemical and power industries. The thread diameter is generally above M30. For detailed specifications, please refer to the anchor bolt specifications and models. These bolts are used for embedding in large, heavy-duty applications such as pressure vessels, power transmission towers, and outdoor advertisements. They can be grouped and welded with positioning plates to form anchor cages, providing strong anchoring performance.

They are manufactured using materials from reputable large factories and are available in options such as Q235B, 35#, 45#, 40Cr, 35CrmoA, and Q355. The products undergo quality inspections to ensure the quality of each set of screws. The specifications for plate anchor bolts are generally above M30.

Foundation Cage bolt

A foundation cage is formed by welding a group of independent anchor bolts, creating a precisely positioned cage. It is also known as an anchor cage. During the later stage of embedding, it is convenient and effortless. Only two relative positions need to be located and leveled, avoiding the risk of inaccurate positioning and improper installation when embedding individual bolts. Each foundation cage consists of 4, 8, 12, 16, or more anchor bolts combined together. A 4-bolt combination is commonly used for embedding lamp poles, guardrails, surveillance poles, and other small-scale pole connections. Foundation cages with more than 4 bolts are generally used for larger components, such as outdoor advertisements and wind power structures. As the number of anchor bolts increases, the corresponding thread diameter also becomes thicker.

In a 4-bolt foundation cage, the thread diameter of the anchor bolts is generally in the range of M16/M18/M20. For combinations with more than 4 bolts, the bolt diameter is usually above M20. The length of the bolts and the inner and outer diameters of the positioning plates can be customized.

Anchor Cage Bolt:

An anchor cage is typically used for embedding and securing large-scale components such as wind power structures, large outdoor advertisements, and towers. It is formed by welding multiple anchor screws and positioning plates.

The advantage of an anchor cage is that it eliminates the precision issue of embedding individual screws. When a single anchor bolt is embedded, it cannot guarantee the embedding precision of each screw, resulting in the risk of improper installation during the subsequent installation of components.

The advantage of an anchor cage is that during foundation embedding and placement, there is no need to consider the relative positions of each anchor bolt. It only requires precise positioning at two points and leveling. Once solidified, the components can be installed properly. The drawback is that it occupies space and is not favorable for transportation.

Weld Anchor Bolt

Weld anchor bolts are generally used in power transmission towers. This standard is established by the power sector and is identified by the code “DL/T 1236-2013 Anchor Bolts and Nuts for Transmission Towers.” The standard specifies the form and dimensions of weld anchor bolts, which are composed of one embedded screw and three umbrella-type anchor bolts welded together.

The material commonly used for weld anchor bolts is Q235B (ordinary carbon steel) or Q345B (low-alloy structural steel, currently known as Q355B). Higher-grade materials can also be selected according to requirements. The diameter of welded anchor bolts is generally M30 or larger, and the length is customized according to specific requirements.

U-shaped Anchor Bolt:

U-shaped anchor bolts belong to a type of embedded bolts. What sets them apart from other anchor bolts is that U-shaped anchor bolts, in practical use, can serve as conventional anchor bolts. This is because U-shaped anchor bolts have dual threads, allowing them to secure 2 hole positions once embedded. Their usage has been gradually increasing in recent years. Another advantage of U-shaped anchor bolts is that their center distance is already adjusted during manufacturing, leading to improved positioning accuracy during later embedding. This eliminates the need for calibration procedures and provides a good balance between cost and performance.

U-shaped anchor bolts are also known as U-shaped embedded bolts and come in two variants: square U-shaped and round U-shaped. The image displayed shows a square U-shaped anchor bolt, but there is not much difference in mechanical performance between the two variants. They are commonly made from Q235 material and can also be selected in higher strength materials such as grade 8.8 or 10.9.

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