Haunch Plates: Durable and Reliable Support for Structural Connections
Haunch plates are critical formwork accessories used to create reinforced corners and load-bearing transitions in concrete structures like pier caps, box girders, and cantilever slabs. At Avanza Steel, our haunch plates are precision-fabricated mild steel components designed to interface seamlessly with girders, walers, and props—ensuring exacting alignment, uniform concrete thickness, and uncompromised structural integrity.
What Are Haunch Plates & Why They Matter
A haunch plate is a thickened section of formwork plate, typically at the junction of a beam and column or girder and slab edge. By integrating a pre-fabricated steel plate at these critical stress points, haunch plates:
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Maintain Dimensional Accuracy: Built-in plate thickness ensures the correct haunch geometry without on-site shimming.
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Enhance Edge Support: Reinforced bearing surfaces distribute concrete thrust evenly into supporting members.
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Accelerate Assembly: Pre-drilled holes and captive nuts align directly with girder splice points and waler channels.
Improve Finish Quality: Smooth, consistent form faces reduce grouting and patch-up work post-stripping.
Specification | Details |
|---|---|
Tolerance | Fabricated per IS 1161 tolerances (±1 mm) |
Finish | Industrial epoxy-dip paint (50 μm) or hot-dip galvanization (85 μm) |
Connection Pattern | M16/M20 captive nut & bolt holes on 150 mm centers |
Plate Size | Standard: 300 mm × 300 mm; custom up to 1,200 mm × 600 mm |
Edge Profile | 50×50×6 mm MS angle welded to plate perimeter |
Plate Thickness | 12 mm – 25 mm (based on haunch height) |
Material | IS 2062 Grade A mild steel plate |
Technical Specifications
Applications & Use Cases
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Pier Cap Formwork
Haunch plates create the tapering transition between piers and deck slabs, ensuring accurate prefabricated haunch geometry and reducing on-site adjustments.
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Box Girders & Bridges
Built-in plate profiles on box girder edges guide concrete into complex cross-sections, preserving interior void dimensions.
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Cantilever Slabs & Balconies
Reinforced haunch plates at slab tips maintain overhang thickness and guard against form distortion under cantilever loads.
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Complex Architectural Features
Use custom-cut haunch plates for curved or stepped haunch profiles in decorative concrete facades.
Integration with Avanza Formwork Ecosystem
Avanza Steel’s girder shuttering is designed to work seamlessly with our broader formwork ecosystem:
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Adjustable Props & Base Jacks: Provide vertical support and fine height tuning beneath each girder Avanza brochure.
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Waler Support Channels: MS channel walers tie multiple girders into a rigid framework, distributing loads evenly.
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Tie Rods & Anchor Nuts: Secure shuttering panels and girder ends back into surrounding structure for lateral stability.
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Haunch Plates & Pier Cap Shuttering: Custom-formed steel plates interface with girders to shape haunch profiles precisely Avanza brochure.
Installation & Best Practices
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Pre-Assembly
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Verify plate orientation: chamfer faces should point toward concrete pour.
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Align captive nuts with girder splice points or waler channels.
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Bolting & Securing
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Tighten M16/M20 bolts to 30–35 Nm to ensure plates remain flush during pour.
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Use drop-forged washers under bolt heads to distribute clamping force.
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Formwork Alignment
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Check haunch plate level and plumb using a spirit level.
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Shim minor deviations (< 1 mm) with stainless-steel shims to maintain tolerance.
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Pour & Strip
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Monitor haunch plate deflection under initial pour: any visible movement > 1 mm should be arrested immediately with additional support.
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Strip formwork once concrete reaches 70% design strength; remove residual debris from plate surfaces.
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Maintenance & Lifecycle
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Post-Use Cleaning: Flush plates with water to remove slurry; avoid acidic cleaners which degrade epoxy coating.
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Inspection Frequency: Every 50 pour cycles, conduct a visual check for weld cracks, plate warping, and coating integrity.
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Re-Coating: Touch up chipped areas with zinc-rich primer for galvanized plates; full re-dip recommended every 500 cycles.
Ensure precision in your next heavy-civil project with Avanza Steel’s ready-to-install haunch plates:
👉 Download the full Product Brochure for detailed part codes, dimensional drawings, and load charts.
👉 Contact our team at avanzasteel@gmail.com or +91 33 4000 7575 to request a site-specific quote, arrange a factory tour, or schedule an on-site technical consultation.