Welded Fabrications

Use post-installed embedded parts secured with chemical anchors or mechanical anchors for remedial work. The use of expansion bolts for fixation is strictly prohibited. Pull-out tests must be conducted upon completion of installation to ensure safety and reliability.

The design calculations encompass: Load Analysis:​ Tension, Shear, Bending Moment, Torsion. Anchor Rebar Calculation:​ Number of bars, diameter, tensile strength, development length in concrete. Anchor Plate Calculation:​ Plate thickness, area & layout, check for local bearing pressure. Weld Calculation:​ Weld tensile capacity, weld leg size, weld length, penetration check. Combined Load Analysis:​ Interaction of Tension & Shear, Interaction of Tension & Bending. Detailing and Code Compliance Check:​ Verification against all applicable standards and detailing requirements.

HRB400 or HRB400E hot-rolled ribbed steel bar is standard, with a yield strength above 400 MPa. It provides high strength and good weldability, with HRB400E offering excellent seismic performance. For heavy loads, long spans, or high bearing capacity, HRB500 material can be used.

Plug welding (also called hole welding) is used for face-mounted embedded parts to ensure more reliable force transfer, higher strength, better resistance to pull-out, shear, and fatigue, and more consistent quality. The anchor plate hole should be bell-mouthed (countersunk). The inner diameter should be 2-4mm larger than the rebar diameter, with a bevel angle of approximately 45 degrees. Welding must completely fill the hole, with perimeter welding around it. Current must be controlled to avoid burning through or damaging the steel plate.