Piled Raft Foundation
The best solution for unstable soil. We design and build such foundations in Essex and London
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Mini Piled Underpinning
What is it piled raft foundation?
A piled raft foundation is a clever combination of both pile foundation and raft foundation. Let’s break it down:
Piles: These are vertical structural elements driven into the ground. They can transfer loads from the superstructure to deeper, more stable soil or rock layers. Piles are often used when the upper layers of soil are weak or compressible.
Raft: A raft foundation (also known as a mat foundation) is a large, flat slab that spreads the load from the building over a wider area. It rests directly on the soil or rock beneath it.
Piled Raft: Now, imagine constructing piles first. These piles penetrate the ground, providing additional support. Next, a raft (the flat foundation slab) is placed, incorporating all the piles. The key factor in designing a piled raft foundation is the interaction between the piles, soil, and raft.
- Pile-Soil Interaction: How the piles interact with the surrounding soil.
- Pile-Pile Interaction: Consideration of the interaction between adjacent piles.
- Raft-Soil Interaction: Understanding how the raft interacts with the soil.
- Pile-Raft Interaction: Ensuring effective load transfer between the piles and the raft.
Advantages of Piled Raft Foundations:
- Reduced Settlement: The addition of piles minimizes overall settlement and differential settlement.
- Improved Lateral Load Resistance: Piled rafts enhance the structure’s ability to resist horizontal forces.
- High Axial Load Applications: They’re commonly used in high-rise buildings with substantial axial loads.
- When Rock Socketing Isn’t Feasible: In cases where piles can’t be socketed into rock due to its absence, piled rafts provide an alternative solution.
Design Considerations:
- Ultimate Load Capacity: Assessing vertical, lateral, and moment loading.
- Settlement: Controlling maximum and differential settlement.
- Raft Moment and Shears: Ensuring structural integrity.
- Pile Loads and Moments: Designing piles effectively.
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Mini Piling
Prime Piling has built up to become one of the best Mini Piled Underpinning service providers.
SCD Piling
SCD (Steel Cased Driven) Piling is a bottom-driven piling using a vibrating mole or a drop hammer piling rig
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With over 20 years of experience and knowledge we offer a complete package with all foundation work, including design, drawings and calculations.
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Innovative approach
Innovative approach
Combines pile raft foundation is the different technique of foundation design which is suitable for both shallow and deep foundation. Not only this but it is suitable for every soil type and it can bear the pressure of superstructure of high rise buildings. As the trend is changing and people invest more in vertical buildings instead of horizontal construction. Thus people considered piled raft foundation as an innovative approach because it plays important role in various things which is neglected by most of us as it allows us to avail the area which is not used because of the foundation designing and construction problem.
Moreover due to the raft on piles technique many f the investors get a chance to develop their business in those areas which are the sites of construction but there is no building there because of weak and porous soil type. Thus pile raft foundation design concept brings new hope to those who have a dream to do something uncertain which is not been done by anyone before. Now people like these can build their dream building in those areas where no one constructs the building before.
DIFFERENCE
How is it different from a simple foundation
It is quite different from the simple foundation as the name of the foundation type distinguishes the characters of the foundation. The raft in the foundation name means the mat which plays an effective role in overcoming the pressure of horizontal loads because it increases the surface area of the foundation and scattered the load evenly so that the building can resist the outer pressure easily. However, a simple foundation is just suitable for limited soil types and for the shallow foundation on which the superstructure is not so heavy. A combined pile raft foundation is suitable for both shallow and deep foundations which means that if you construct this type of foundation you can build high rise buildings easily even if the soil type is not standard. Most of the building designers and contractors suggested this foundation because of its capability and resistance against the pressure of the load.
If you want to get this foundation for your building you can contact us through the contact details given on our website.
FAQ
Frequently Asked Questions
Piling is the process of inserting structural piles into the ground that will become the base of the building. Piles are required where soil and earth are performing poorly and are used to spread the load of a building and firm the ground. They are a cost-effective approach to combating corrosion and are proven to significantly improve the life expectancy of a structure
The size of the trench depends on the size of the ground beam to be installed. For our typical ground beams to an extension an excavation of 600mm deep and 450mm wide is sufficient. Please ring for advice.
There are a number of reasons it may be: A site investigation has highlighted that the ground is unsuitable and un-useable to a depth of more than 2 metres. Removal costs for the excavation of traditional deep trench foundations are too expensive. Foundation trenches are not stable and health and safety, therefore, becomes an issue. There is a high-water table. Where there are soils such as clay that are likely to swell or shrink excessively depending on the amount of water content.
The job of the pile is to distribute the weight of the structure evenly. They are placed into the ground using a pile driver. Holding the piles perfectly vertical, this machine hammers each structure into the ground and also acts as a crane.
For a typical house extension, the work can take around 2-3 days, depending on the depth driven and services requested. For more complex projects, contact us for a more specific time frame.
Mini piling in Essex and Colchester is a type of specialist piling that incorporates a specific arrangement and number of driven pile and screw pile varieties. It allows for the expansion or extension of a building, while also safeguarding against ground heave and subsidence. Crucially, mini piling is often a cheaper, faster option than traditional deep trench foundations.
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