REBAR ANCHORING
2. REBAR ANCHORING
Anchoring steel bars in concrete is needed when an additional structural concrete member is to be linked to existing structure or to increase the section of the existing structure.
Before anchoring steel bars into concrete, data should be collected related to:
- Concrete strength in which steel bars are to be anchored
- Class of steel used for anchoring
- Effective load that the steel bar will be subjected to.
Based on the above data, the choice of steel diameter, depth of anchoring and distance between anchors will be determined.
There are two ways to transform any Structure:
1) Without changing the main structure, the interior and exterior decoration and facilities should be reformed to meet the use requirements.
2) The main structure, decoration and facilities are comprehensively renovated to achieve the purpose of strengthening and increasing the use area.
Structural rebar anchoring is to drill holes in the original concrete structure, insert steel bar into the hole of concrete, and inject structural glue (of make Hilti, Fosroc etc.). Through the bonding of structural adhesives, the concrete hole wall and the external surface of steel bars form a firm bonding anchorage force, which relies on the bonding anchorage force to resist the pull-out force and shear force of steel bars, so as to achieve the purpose of connecting new and old structural components. Because the strength of reinforcement is greater than that of structural colloid and the strength of structural colloid is much greater than that of concrete, the bond strength between structural colloid and pore wall concrete is controlled by the strength of original concrete members.
