High-Quality Anchor Bolts Manufacturer
I. 7-shaped anchors (7-shaped anchor bolts)
1. Product definition and structure
The 7-shaped anchor is named because one end of the bolt is bent in a "7" shape. It is one of the most basic types of anchor bolts. Its structure includes a threaded rod body and an L-shaped hook. The hook part is buried in the concrete foundation and connected to the equipment or steel structure through a nut to achieve a stable fixation.
2. Core materials and characteristics
Material: Commonly used Q235 ordinary carbon steel (moderate strength, low cost), Q345 low alloy steel (high strength) or 40Cr alloy steel (ultra-high strength), the surface can be galvanized (hot-dip galvanized or electro-galvanized) for corrosion protection.
Features:
Flexible installation: The hook design enhances the holding force of concrete and is suitable for fixing small and medium-sized equipment;
Pull-out performance: The mechanical engagement between the hook and the concrete resists upward pulling force;
Standardization: It complies with national standards such as GB/T 799, and the specifications are optional from M16 to M56.
3. Functions and applicable scenarios
Functions:
Fix steel structure columns, street lamp bases, and small mechanical equipment;
Bear static loads, such as building frames and billboard brackets.
Scenario:
Municipal engineering (street lamps, traffic signs), light steel structure factories, and household equipment (such as air conditioner outdoor unit brackets).
4. Installation and maintenance
Installation:
Reserve holes in the concrete foundation, insert the 7-shaped footing and cast;
Tighten the equipment with nuts and adjust the level when installing it.
Maintenance: Check the tightness of the nuts regularly, and the damaged galvanized layer needs to be repainted for corrosion protection.
5. Purchase suggestions
Choose materials according to the load: Q235 is suitable for ordinary scenes, Q345 is suitable for high loads (such as bridges);
The length of the hook must meet the requirements of the concrete burial depth (usually 25 times the bolt diameter).
II. Welded plate anchor (welded plate anchor bolt)
1. Product definition and structure
The welded plate anchor consists of a threaded rod, a welded pad and a stiffening rib. The pad is fixed with bolts by welding to form an integrated structure of "bolt + pad". The pad increases the contact area with the concrete, disperses the load and improves stability.
2. Core materials and characteristics
Material:
Bolt: Q235, Q355 or 42CrMo high-strength steel;
Pad: Q235 steel plate, thickness 10-20mm, size designed according to the load.
Features:
High bearing capacity: The pad disperses pressure and can withstand loads from several tons to tens of tons;
Anti-seismic and shock-resistant: The welded structure reduces the risk of loosening and is suitable for vibrating environments;
Anti-corrosion and durable: The whole is galvanized or painted, suitable for harsh environments such as chemical and marine.
3. Functions and applicable scenarios
Functions:
Fix heavy equipment (such as reactors, steelmaking furnaces), large steel structures (bridges, power towers);
Resist horizontal shear and torque to ensure long-term stable operation of equipment.
Scenario:
Power engineering (substation equipment), chemical industry (storage tanks, reactors), metallurgical plants (rolling equipment).
4. Installation and maintenance
Installation:
The welding plate foot is embedded in the concrete foundation, and the pad is welded to the steel mesh;
When the equipment is installed, it is connected to the pad by bolts, and a torque wrench is required to ensure the preload.
Maintenance: Regularly check the integrity of the weld to avoid corrosion and strength loss.
5. Purchase suggestions
Choose the size of the pad according to the weight and vibration frequency of the equipment (e.g., a 200x200mm pad can carry more than 5 tons);
The welding process must comply with the GB/T 5185 standard, and the welding rod must match the steel type (e.g., Q235 uses E43 welding rod).
III. Umbrella handle anchor (J-type anchor bolt/umbrella handle embedded bolt)
1. Product definition and structure
The umbrella handle anchor is named because the end of the bolt is a J-shaped hook (similar to the umbrella handle). It consists of a threaded rod and a J-shaped hook. The hook part is completely embedded in the concrete to provide pull-out resistance.
2. Core materials and characteristics
Material: Q235 carbon steel (conventional), Q345 alloy steel (high strength), surface galvanized or phosphating.
Features:
Flexible pre-embedding: The length of the hook can be customized to meet different burial depth requirements;
Economical efficiency: Simple processing, lower cost than welded plate anchors;
Corrosion resistance: The galvanized layer can resist general corrosion and has a service life of more than 10 years.
3. Functions and applicable scenarios
Functions:
Fix small and medium-sized steel structures, street lamp posts, and small machinery;
Suitable for temporary or semi-permanent installation, easy to disassemble.
Scenario:
Municipal street lamps, billboards, agricultural equipment, small factories.
4. Installation and maintenance
Installation:
Drill a hole in the concrete foundation, insert the umbrella handle anchor and pour it;
When installing the equipment, tighten it with a nut, and the direction of the hook must be consistent with the direction of force.
Maintenance: Avoid deformation of the bolts caused by over-tightening, and regularly check whether the concrete is cracked.
5. Purchase suggestions
Select the hook length according to the embedded depth (e.g. if the embedded depth is 300mm, the hook length can be 200mm);
It is recommended to choose hot-dip galvanized material in high humidity environment, and the salt spray test needs to be more than 72 hours.
Ⅳ. Comparison and selection guide of three major anchors
Type 7-shaped anchor Welded plate anchor Umbrella handle anchor
Core advantages Standardization, low cost High load-bearing capacity, vibration resistance Flexible embedding, economy
Applicable load 1-5 tons 5-50 tons 1-3 tons
Typical scenarios Street lights, light steel structures Bridges, heavy equipment Temporary buildings, small machinery
Installation method Embedding + nut fastening Embedding + welding pad Embedding + nut fastening
Corrosion resistance level Electrogalvanizing (conventional) Hot-dip galvanizing + painting (high corrosion resistance) Galvanizing (ordinary)
Selection suggestions:
Economic needs: Umbrella handle anchors are preferred, taking into account both cost and function;
High stability needs: Welded plate anchors are the first choice for heavy equipment;
Standardized scenarios: 7-shaped anchors are suitable for most conventional fixing needs.
