Anchor bolts belong to the category of rear anchoring fasteners, which achieve a stable connection between components and substrates through mechanical interlocking or chemical bonding. It can also be regarded as a derivative type of bolt, widely used in fields such as construction engineering and mechanical fixation.
I Mechanical anchor bolt (physical expansion/locking force)
Pure metal mechanical structure, relying on expansion friction/hole bottom mechanical locking keys to form anchoring force, without chemical agents, can be subjected to force after drilling and installation, and can be divided into expansion type, expansion bottom type, and hammering type.
1. Expansion type anchor bolt (expansion bolt, expansion screw)
Meaning: By tightening the nut to pull the cone head, the metal sleeve is stretched open, the hole wall is squeezed, and the anti pull bearing capacity is generated by the frictional force of the contact surface, which is common in the market.
Characteristics
✅ Advantages: Fast construction and high cost-effectiveness.
❌ Shortboard: Friction attenuation under long-term alternating vibration, easy to loosen, and cannot be used for seismic load-bearing structures.
Usage: Indoor lightweight suspension rod, ordinary pipeline support, simple light steel keel, small equipment base, decorative fixation, etc.
2. Expanded bottom anchor bolt (rear cut bottom anchor bolt)
Meaning: An anchor bolt that uses a specialized drill bit to expand the bottom of the hole, allowing the anchor bolt locking plate to fully fit into the expansion chamber and form a mechanical lock key. It does not rely on friction and belongs to the category of rigid embedded force, not ordinary expansion bolts.
Characteristics
✅ Advantages: The anchoring force is much higher than that of ordinary expansion bolts, and the anti vibration and anti fatigue performance is excellent; No expansion stress, concrete is not easy to crack; Cracked concrete can be used.
❌ Shortcoming: Construction requires specialized bottom expansion drill bits, with complex processes and higher unit prices.
Usage: Curtain wall keel, heavy equipment base, high vibration machine room equipment, cantilever structure, etc.
3. Strike type hammering anchor bolt
Meaning: A simple anchor bolt that can be anchored by simply hammering and tapping the sleeve without the need for rotation and tightening, allowing the anchor bolt head to expand and expand.
Characteristics
✅ Advantages: Simple installation and operation, fast construction speed.
❌ Shortcoming: Low load-bearing capacity, limited to non heavy load scenarios.
Usage: Quick fixing of small hanging parts for indoor decoration gypsum boards, lightweight partition walls, and thin concrete layers, fixing of lightweight cable trays and auxiliary keels, and batch installation of lightweight points.
II Chemical anchor bolt (resin colloid bonding anchor)
Composed of a screw and a chemical agent tube, anchoring is achieved by bonding the screw and substrate with resin agent.
1. Ordinary chemical anchor bolt
Meaning: Pure colloidal bonding force, without mechanical locking structure, fully supported by colloidal bonding force.
Characteristics
✅ Advantage: No expansion stress.
❌ Shortcomings: Poor seismic and fatigue resistance, and long-term vibration may cause colloid delamination and detachment; Low temperature curing is slow.
Usage: Indoor static light load bracket, ordinary decorative suspension rod, etc.
2. Special inverted conical chemical anchor bolt
Meaning: The tail of the screw is designed as an inverted cone structure, combined with a special modified anchoring adhesive. After the gel solidifies, it forms a high-performance chemical anchor bolt with the inverted cone to form a locking force.
Characteristics
✅ Advantages: Strong anchoring force, excellent fatigue and vibration resistance; Suitable for cracked concrete; It is the mainstream selection for seismic and vibration conditions.
❌ Shortcoming: The medication needs to be cured and wait, and the construction period in low-temperature environments is prolonged.
Usage: Outdoor heavy-duty engineering, bridge guardrails, wind power equipment bases, structural reinforcement with steel bars, coastal outdoor engineering, etc.
III Plastic anchor bolt (lightweight decoration)
Meaning: Plastic expansion tube, nylon/PE plastic sleeve, used with self tapping screws, relying on screws to support the plastic tube, squeezing the hole wall for friction fixation.
Characteristics
✅ Advantages: Insulation, low cost, easy installation, suitable for loose and lightweight substrates such as aerated blocks and gypsum boards.
❌ Shortboard: The overall load-bearing capacity is limited, and there is no seismic or heavy load capacity.
Usage: A lightweight decorative product, suitable for indoor decoration pendants, installation of wire and pipeline clamps, and other light load scenarios.
Post time: 9月-09-2026
