A combi wall, also known as a combined wall, is a high-strength structural design used for bulkhead walls.
Combi Wall Defined
A combi wall is a specialized construction technique employing a combination of different structural elements to create a robust barrier. It's not just a single type of material but a composite structure designed to withstand significant loads and harsh conditions. According to our reference, it is:
A structural design for a bulkhead wall using a combination of pipe, beams, and/or sheetpiling that are connected with interlocks in order to provide a very high strength alternative to typical sheetpiling designs.
Key Components and Features:
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Combination of Materials: A combi-wall is made from a mix of components such as:
- Pipes: Often used as primary structural members providing strength and stability.
- Beams: Serve as a reinforcing element.
- Sheet Piling: Adds to the wall's strength.
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Interlocks: The various elements are joined using interlocks, creating a unified and solid structure.
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High Strength: The combination of materials and interlocks make a combi wall far stronger than a standard sheet piling design, allowing it to manage higher forces and greater depths.
Practical Insights and Examples:
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Use Cases: Combi walls are often used in:
- Marine projects (like docks and harbors).
- Deep excavations.
- Flood defenses.
- Retaining walls that require significant strength.
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Strength Advantages:
- Increased Stability: Greater resistance to lateral pressure and bending.
- Deeper Excavations: The higher strength allows for safer excavations in deeper ground conditions.
- Versatility: Can be adapted for different project needs and site conditions by adjusting the components.
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Design Considerations
- Load Requirements: Engineers analyze load to choose the right combination of materials and proper interlocks.
- Soil Conditions: Type of soil and groundwater presence also play a big role in selecting the most appropriate components of the combi wall.
- Corrosion Protection: Protective measures are often needed to ensure the longevity of the structure.
Advantages Over Typical Sheet Piling
| Feature | Combi Wall | Typical Sheet Piling |
|---|---|---|
| Strength | Very High | Moderate |
| Material | Combination of various materials | Primarily sheet piling |
| Depth | Capable of deep excavations | Limited by sheet pile strength |
| Applications | Demanding and high strength requirements | General retaining walls |
In summary, a combi-wall is a composite structure that combines different materials like pipes, beams, and sheet piles with interlocking mechanisms to create a high-strength retaining structure, ideal for applications needing superior strength and durability compared to traditional sheet piling.
