If you work in construction, civil engineering, or architecture, you’ve likely heard the term simbramento. But what exactly does it mean, and why is it critical for project safety and success?
In simple terms, simbramento (often confused with cimbramento or escoramento) refers to the temporary structural support system used to hold up a building, bridge, slab, or arch until the permanent structure can support itself. Without proper simbramento, concrete collapses, walls buckle, and workers face life-threatening risks.
In this guide, we’ll break down:
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The definition and purpose of simbramento
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Types of shoring systems
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Key materials (wood, steel, aluminum)
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Safety regulations and load calculations
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Step-by-step installation best practices
Let’s dive in.
What is Simbramento? Definition & Purpose
Simbramento is the set of temporary supports, props, and frameworks that sustain a construction element during its curing, assembly, or strengthening phase. It is most commonly used for:
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Concrete slabs and beams – while the concrete hardens (curing period)
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Arches and vaults – until the keystone is locked in place
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Bridge decks – during segmental construction
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Underground excavations – to prevent soil collapse
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Renovations – when removing load-bearing walls
⚠️ Important: Simbramento is not the same as formwork (molds for concrete). Formwork gives shape; simbramento provides vertical and lateral support.
Types of Simbramento Systems
Choosing the right shoring system depends on load, height, ground conditions, and project duration.
1. Traditional Wooden Shoring (Madeiras)
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Best for: Small residential projects, low heights (under 3m)
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Pros: Cheap, easy to cut/modify
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Cons: Low reusability, fire risk, requires skilled labor
2. Steel Prop Shoring (Tubular / Telescopic)
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Best for: Medium to high loads, adjustable heights
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Pros: High strength, reusable, fast assembly
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Cons: Heavy, requires corrosion protection
3. Aluminum Shoring Systems
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Best for: High-rise slabs, repetitive floor cycles
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Pros: Lightweight, modular, corrosion-resistant
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Cons: Expensive, lower load capacity than steel
4. Hydraulic Shoring
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Best for: Excavations, trenches, emergency stabilization
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Pros: Instant pressure application, remote operation
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Cons: High cost, requires hydraulic pumps
5. Flying Form / Table Shoring
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Best for: Large-area slabs (parking garages, malls)
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Pros: Moves as one unit, reduces labor
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Cons: Requires crane access
Critical Safety Factors in Simbramento
Poorly designed simbramento causes 30% of temporary structure failures on construction sites. Follow these non-negotiable rules:
✅ Load Calculations (Never Guess)
Every prop has a rated capacity. Factor in:
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Dead load (self-weight of concrete + forms)
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Live load (workers, equipment, vibration)
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Environmental loads (wind, rain, temperature)
Formula example:
Total Load = (Concrete volume × density) + (Live load per m²) + Safety margin (min 25%)
Proper Spacing and Bracing
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Vertical props: typically 0.8m to 1.2m apart
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Horizontal bracing every 1.5m to prevent buckling
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Diagonal bracing for lateral stability (wind, pump hose reaction)
Base Plates and Sole Plates
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Use steel base plates on soft ground
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Distribute load with wooden sole plates (minimum 40mm thick)
Curing Time – Do Not Rush
Concrete needs time to reach 75% of design strength before removing simbramento. Typical minimums:
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Slabs: 7–14 days
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Beams: 14–21 days
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Cold weather: add 50% more time
🔧 Pro tip: Perform a striking test (hammer rebound) before dismantling any shoring.
Step-by-Step: Installing Simbramento for a Concrete Slab
1st Step – Planning
Create a shoring layout drawing showing prop positions, spacings, and head/jack extensions.
2nd Step – Ground Preparation
Compact soil, remove debris, and lay sole plates to prevent settlement.
3rd Step – Erect Vertical Props
Start from one corner. Extend props to desired height but leave 50mm for final adjustment.
4th Step – Install Horizontal & Diagonal Bracing
Secure all props together in both directions using scaffold clamps or nailed braces.
5th Step – Place Formwork on Top
Lay beams (wood or aluminum) across prop heads, then place plywood formwork.
6th Step – Final Leveling
Use prop adjustment nuts to bring the formwork to exact elevation (use a laser level).
7th Step – Pour Concrete
Monitor props during pour – no deflection, leaning, or sinking.
8th Step – Curing & Striking
After curing time, slowly lower props starting from the center outward.
Common Mistakes to Avoid
| Mistake | Consequence |
|---|---|
| Uneven prop heights | Cracked slab, load concentration |
| No bracing | Prop buckling, collapse under wind/vibration |
| Removing too early | Structural failure, injury |
| Mixing old and new timber | Unknown load capacity |
| Ignoring base plates | Sinking into ground, tilting |
Simbramento vs. Escoramento vs. Cimbramento
Many people confuse these terms. Here’s the distinction:
| Term | Meaning |
|---|---|
| Simbramento | Generic term for temporary support (often used interchangeably with escoramento in Brazil/Portugal) |
| Escoramento | Vertical shoring specifically for excavations, trenches, or under slabs |
| Cimbramento | Shoring for arched structures (bridges, domes, tunnels) |
For most slab and beam work, you are dealing with escoramento or simbramento.
When to Hire an Engineer
You must involve a structural engineer if:
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Slab thickness > 25cm
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Clear height > 4 meters
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Point loads (heavy equipment, storage)
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Non-rectangular shapes (circular, triangular)
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Any soil other than firm, compacted ground
*DIY simbramento is only safe for small ground-floor slabs under 1.5m height.*
Conclusion
Simbramento is the silent hero of every concrete structure. It keeps slabs level, beams intact, and workers safe. Whether you use steel props, timber, or hydraulic systems, always prioritize load calculations, proper bracing, and adequate curing time.
Before your next pour, ask yourself:
👉 Is my shoring rated for the load?
👉 Are all props plumb and braced?
👉 Have I waited for full concrete strength?
Get these right, and your structure will stand for decades.
Frequently Asked Questions (FAQs)
Q: How long should simbramento stay in place?
A: Minimum 7 days for slabs in normal conditions; 14–21 days for beams or cold weather.
Q: Can I reuse steel shoring props?
A: Yes, but inspect for bends, corrosion, and damaged threads before reuse.
Q: What is the difference between simbramento and formwork?
A: Formwork is the mold (plywood, panels). Simbramento is the support (props, frames).
Q: Is simbramento required for precast concrete?
A: Only during erection until connections are secured. Temporary props are often used.
