Concrete self tapping anchor bolt is a post anchoring technology fastener that directly forms an anchoring effect in concrete through hard threads. The following analysis is conducted from multiple dimensions:
1, Core Features
1. Self attack anchoring mechanism
By relying on high hardness threads (usually grade 10.9 or above carbon steel) to directly cut into the concrete hole wall, a threaded interlocking structure is formed without the need for pre drilling or chemical bonding agents. Its anchoring strength can be verified through destructive tensile tests, which usually result in the failure of the concrete cone rather than the failure of the anchor bolt body.
2. Reversible installation design
Support disassembly through rotation direction adjustment, especially suitable for temporary fixed scenarios (such as scaffolding, formwork support), significantly reducing engineering renovation costs.
2, Technical parameters and adaptability
1. Principle of specification matching
The diameter of the anchor bolt and the diameter of the opening must strictly correspond (such as M8 anchor bolt corresponding to 8mm drilling hole), and different length models (such as 6 × 35, 6 × 55) can be adapted to different thickness substrates to ensure that the anchoring depth meets the bearing requirements.
2. Material performance grading
• Basic version: Grade 8.8 or above carbon steel, suitable for conventional environments
Anti corrosion enhanced version: 410 stainless steel+surface anti-corrosion treatment, can resist extreme working conditions such as marine climate and chemical corrosion
High strength version: 12.9 grade carbon steel, used for fixing heavy equipment and seismic fortification areas
3, Application scenarios
1. Building structure reinforcement
When installing seismic supports and suspension systems in concrete beams, slabs, columns, and other areas, quick anchoring can be achieved without affecting the integrity of the substrate.
2. Equipment installation
Used for fixing curtain wall keels and mechanical and electrical pipeline supports, its small margin installation characteristics can adapt to complex spatial layouts.
3. Temporary works
In scenes such as event venues and exhibition construction, detachable anchoring of scaffolding and stage structures can be quickly completed.
4, Technical advantages
1. Construction efficiency
Compared to traditional expansion anchor bolts, the installation time for a single piece is reduced by more than 60%, and there is no need to wait for the adhesive to cure.
2. Bearing capacity
In C30 concrete, the tensile bearing capacity of a single anchor bolt can reach 8-15kN, and the shear bearing capacity can be 5-10kN (specific data depends on specifications).
3. Environmental adaptability
By upgrading the material, it can cover the temperature range of -20 ºC to 80 ºC and has IP68 dust and water resistance.
5, Selection and Construction Points
1. Substrate evaluation
Concrete strength (recommended C25 or above), crack width (≤ 0.3mm), and steel density need to be tested to avoid conflicts between anchor bolts and steel bars.
2. Tool matching
It is recommended to use an electric wrench with torque control, and the installation torque should be controlled within ± 15% of the nominal value.
3. Quality control
After installation, a sampling pull-out test is required, and the qualified standard for bearing capacity is 1.5 times the design value.
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