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Raft foundation is reinforced concrete slab that is supported on a compacted hardcore base that is bigger than the raft. The procedures in construction the foundation involves checking the soil properties, and making the edge of the raft stepped to make a toe so the outer leaf of the wall goes below ground. The slab is reinforced with steel, a radon barrier is added, and a damp proof course is put in.
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What is a raft beam?
The perimeter beam around the edge of a raft foundation.
What are the disadvantages of raft foundation?
disvantages of a narrow strip foundation
What is the difference between a raft foundation and a mat foundation?
They r the same. There is no difference.
What is difference between combined footing and raft foundation?
A Combined footing is a long footing supporting two or more columns in one row. While a Mat or Raft foundation is a large footing, usually supporting several columns in two or more rows.
Why you have to use raft foundation?
A raft foundation, also known as a mat foundation, is a type of shallow foundation that is used in construction to distribute the weight of a building or structure evenly across a large area of soil. It is typically used when the soil's load-bearing capacity is relatively low, or when the building's loads are heavy and spread over a wide footprint. Here are some reasons why a raft foundation might be used: **Uniform Load Distribution**: Raft foundations are designed to distribute the load of a building uniformly over a larger area of soil. This helps prevent localized settlement that could occur with point loads or strip foundations. **Poor Soil Conditions**: If the soil at a construction site has low bearing capacity, meaning it can't support heavy loads without excessive settlement or deformation, a raft foundation can help distribute the loads over a larger area, reducing the pressure on the soil. **Variability in Soil**: In some cases, the soil properties might vary across the construction site. A raft foundation can help mitigate the effects of differential settlement, where one part of the building's foundation settles more than another due to varying soil conditions. **Heavily Loaded Structures**: Raft foundations are commonly used for buildings with heavy loads, such as multistory buildings, warehouses, or industrial facilities. The broad contact area with the soil helps prevent excessive stress on the ground. **Reduced Foundation Depth**: Raft foundations are shallow foundations, meaning they are located closer to the ground surface compared to deep foundations like piles or caissons. This can save excavation costs and make construction more efficient. **Economical Solution**: In some cases, a raft foundation might be more cost-effective compared to using deep foundations, especially when the structure's loads are spread out over a large area. **Stability in Poor Soil**: If the soil has a potential for lateral movement (such as in areas with high groundwater or seismic activity), a raft foundation can provide stability by distributing lateral forces over a larger area. **Preventing Differential Settlement**: In situations where multiple structures are built close to each other, a raft foundation can help prevent differential settlement that might occur if different structures have different foundation systems. It's important to note that while raft foundations offer several advantages, they might not be suitable for all construction scenarios. Factors such as soil type, building loads, local climate, groundwater levels, and structural design will all influence whether a raft foundation is the appropriate choice. Engineering professionals, including structural and geotechnical engineers, play a crucial role in determining the most suitable foundation type for a specific project based on site conditions and building requirements.
Why build a house on raft instead of foundation?
Its all about the type of soil and the building structure is going to build on it. If the site soil is not the type (i.e; like clay soil, the soil cannot having load bearing capacity etc.,) for constructing big buildings, its better to go for raft foundation. Because, this type of foundation spreads the load of building to overall area and if the foundations are constructing very near by each other means. In that time also, this foundation can be laid.
What is a raft beam?
The perimeter beam around the edge of a raft foundation.
What are the advantages and disadvantages of raft foundation?
The main advantage of a raft foundation is that it is more economical. Another advantage is that it requires little excavation. The disadvantages of raft foundations are that there is a greater potential for erosion, and they require specific treatments to bear a load.
What are the disadvantages of raft foundation?
disvantages of a narrow strip foundation
What is a rafter foundation?
It are a Afrikaans way of saying Raft Foundation.
What are the types of raft foundations?
Types of raft foundation are 1. Solid slab raft 2. Beam and slab raft 3. Cellular rafts
What is the difference between a raft foundation and a mat foundation?
They r the same. There is no difference.
Difference between raft and mat foundation?
The raft will help to avoid any settlement that would occur to strip the foundation. The mat is just placed there to avoid slipping.
How do you build raft foundation?
just pour concrete on caison
Why a pile raft foundation?
If the soil is so lose that it cant hold the building even with pile foundation. So, piled raft foundation is used which make the building to float like a boat. That obeys Archimedes' principle-it is buoyed up by the weight of the earth displaced in creating the foundation.
Can you list types of foundation in building?
Matt or Raft Foundation Combined Footings Pile Cap Foundations Isolated Foundations Continous Foundation
Method statement hise rise raft foundation?
plastic shrinkage repairing
