Caisson Foundation: Types, Construction, and Advantages

Caisson foundation or also known as a pier foundation is a deep foundation system designed to support heavy structures. This type of foundation is popular for large-scale projects because it works by transferring structural loads to rock layers located deep beneath the ground.

Therefore, the installation of caisson foundation involves sinking the caisson into the ground or underwater until it reaches a stable layer. After that, the structure is filled with concrete to create a strong and durable foundation.

This article will talk about caisson foundations, their types, applications, advantages, and how to maximize construction project efficiency with the right foundation solution.

Key Takeaways

• Caisson foundations are watertight retaining structures used for construction projects that are sunk into the ground to provide a deep, stable base.
• There are several caisson types, including open, pneumatic, and box caissons. Each designed for specific site conditions and project needs.
• The main advantages of caisson foundation includes adaptability to various ground conditions, minimal environmental disruption, and effectiveness for underwater work.
• ScaleOcean Construction ERP Software helps manage projects while streamlining resource and budget management more accurately and efficiently.

Request a Free Demo!

1. What is Caisson Foundation?

A caisson foundation is a watertight structure, usually cylindrical or box-shaped, that is sunk into the ground or underwater to reach a firm soil. Once it reaches the solid layer, it is filled with concrete to form a stable foundation.

Moreover, caisson foundation is designed to transfer structural loads through unstable layers, and then anchor them into a stable base. In a country like the Philippines, where many communities are built near soft terrain, caisson foundations provide stability and long-term structural support.

In addition, caisson foundation gives strength, stability, and long-term durability for heavy loads. It is because caisson foundation requires precision during the process. One of the techniques is that the structure is slowly sunk into the ground carefully.

2. When to Use Caisson Foundations?

Caisson foundations are used in construction projects that require deep and stable support systems. As one of the important types of foundations in construction, caisson foundations are designed to reach rock layers. Below are several situations where caisson foundations are commonly used:

• Bridge Construction in Water Areas: One of the reasons to apply caisson foundation is when the project is built on the water areas. Caissons are often used for bridge piers and abutments in rivers, lakes, and coastal areas.
• Weak or Unstable Soil Conditions: Not only water areas, caissons also can build in areas like marshlands or soft soil, caissons transfer loads past the weak surface layer down to stronger ground.
• High Groundwater Environments: Although conventional foundations struggle in places with high groundwater, caisson on the opposite of this. caissons are designed to perform well in wet conditions, making them a reliable choice.
• Heavy Load Structures: Projects such as high-rise buildings, ports, offshore platforms, and industrial facilities require foundations that can handle massive loads. Caissons distribute these forces effectively.
• Marine and Coastal Construction Projects: For dams, seawalls, docks, and other marine structures, caissons provide the underwater support needed for long-term safety and durability.

3. Types of Caisson Foundations

After understanding the meaning and the best way to use caisson, you have to know types of caisson foundations. There are several types of caisson foundation used in construction projects. Also, each type of these is designed for specific structural requirements, such as:

a. Box Caisson

The first type is box caisson. It is a prefabricated hollow box structure that is placed into position at the construction site. After installation, the box is filled with concrete or other materials to create a stable foundation. It is commonly used in areas where the soil is relatively stable.

b. Excavated Caisson

Different from box caisson, excavated is using drilling methods. It is constructed by drilling or excavating deep holes into the ground and then filling them with reinforced concrete. This method is suitable for projects requiring high load-bearing capacity with heavy infrastructure.

c. Floating Caisson

The third is floating caissons. It is similar to box caissons, floating caissons are also fabricated elsewhere, but it’s floated to the project location. Once positioned correctly, they are sunk into place and secured.Therefore, it is commonly used in marine and harbor construction projects.

d. Open Caisson

The fourth type of caisson remains open at both the top and bottom during construction. As workers excavate soil from inside the structure, the caisson gradually sinks under its own weight. It is commonly used for bridge foundations and other underwater projects.

e. Pneumatic Caisson

After open caissons, pneumatic caissons are specialized foundations that use compressed air to keep water and soil out during excavation. Thus, this method allows workers to operate safely underwater. However, this method is expensive and requires specialized equipment.

f. Monolithic Caisson

The last type is monolithic caisson. It is built as a single continuous structure instead of separate sections. This design provides stronger structural integrity and durability. This type is commonly used for massive infrastructure projects that require high resistance against water pressure.

4. Advantages of Caisson Foundation

Foundations offer different advantages on their design, and the same applies to caisson foundations. Here are advantages of caisson foundation for large-scale construction projects to maximize building’s durability:

a. Effective for Underwater Foundations

One of the biggest advantages of caisson foundations is its ability to perform well in underwater construction environments. It provides strong structural support for bridges, ports, and offshore facilities.Therefore, it makes it highly suitable for many infrastructure projects in the Philippines, especially in coastal and flood-prone regions.

b. Environment Friendly

Another benefit of the caisson foundation is that it is environmentally friendly. Compared to other deep foundation systems, caisson foundations can reduce excessive vibration and noise during installation. Additionally, certain methods reduce soil displacement to prevent environmental pollution.

c. Versatility and Adaptability

Finally, caisson foundations are versatile and adaptable. Caisson foundations are adjusted to different soil conditions, water depths, and project requirements.Their flexible design allows engineers to use them in various construction applications, and can handle different types of loads.

In addition, caisson foundations can handle both vertical and horizontal loads. A study published in Acta Geotechnica showed that caisson foundations perform well in both onshore and offshore conditions. It highlights that caisson suitable for complex construction projects.

5. Limitations of Caisson Foundation

Although caisson foundations offer several advantages for construction projects, they also come with certain limitations. Project managers should carefully consider these factors before implementation:

a. High Upfront Costs

The first thing to consider is high investment. Caisson foundations typically require specialized equipment, materials, and construction processes, which can make them expensive. Costs are even higher for deep underwater projects.

b. Requires Specialized Staff

Beyond financial considerations, caisson installation demands skilled professionals. Experienced engineers, divers, and construction workers are often necessary, making the process more complex. Therefore, it increases labor costs and project complexity.

c. Not Suitable for Polluted Sites

The last limitation of caisson foundation is pollution. Construction can be difficult in highly contaminated water or soil, and hazardous materials. It may pose safety risks during excavation and installation. Therefore, it needs extra protection to enhance the construction process.

6. Conclusion

Caisson foundations are a suitable construction foundation for heavy construction in challenging areas. Understanding what is caisson foundations and the different types of them can help contractors choose the most suitable solution for structural stability.

In the Philippines, caisson foundations play an important role in infrastructure development. However, successful implementation also depends on proper planning, cost management, and efficient project coordination.

To improve construction operational efficiency, construction projects can use ScaleOcean Construction ERP Software. It is an integrated digital solution for project planning, budgeting, procurement, and construction monitoring.

If you want to streamline your construction operations more effectively, you can also request a free demo to explore how the system supports your business needs.