What is pile foundation and all detailed knowledge about this type of foundation

When starting to build a house, the foundation is the core factor that determines the sustainability and safety of the entire project. Among the foundation solutions, pile foundations are preferred due to their high load-bearing capacity and suitability for many geological conditions. So What is pile foundation? and why is it so important? Article from XHOME Saigon will help you understand what pile foundation is, common types of pile foundation, how to calculate and important notes to avoid mistakes from the beginning.

What is pile foundation?

Pile foundation is a type of deep foundation, made of piles (reinforced concrete, bored piles, centrifugal piles, ...) driven or pressed into good soil layers, capable of bearing the load. These pile heads are connected together by a common structure called pile cap (in the form of a copy) and the system foundation tie (foundation beam).

The main task of pile foundation is to transmit the load of the entire structure from above to the solid layers of soil and rock deep underground. This transmission force includes:

• Pile friction force: Frictional force between the pile surface and the surrounding soil.
• Pile tip resistance (pile tip resistance): Bearing capacity of soil layer under pile tip.

The pile cap will receive the load from the column and distribute it evenly to the piles. The foundation tie plays a role in connecting the pile caps, helping them work simultaneously on a plane, limiting uneven settlement, ensuring the stability of the project.

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When should pile foundations be used?

Pile foundation is the optimal solution in the following cases:

1. Good soil layer lies deep: When the ground surface is weak and cannot bear the load, it is necessary to transfer the load to a better layer of soil below.
2. Large construction loads: For high-rise buildings, houses with complex structures and heavy loads.
3. Small construction deformation requirements: It is necessary to minimize settlement and deformation of the project to ensure safety and aesthetics.
4. Construction near existing structures or in complex geological areas: Pile foundation helps minimize impact on neighboring structures

Popular types of pile foundations today

There are many types of pile foundations depending on construction contract, structural design The homeowner and contractor agree on what type of foundation to choose, but the most common in civil and industrial construction include:

1. Precast reinforced concrete pile foundation:
   • Piles are precast at the factory or construction site, then hammered or pressed to lower the piles.
   • Usually used for residential buildings, each pile load can be from 20 - 100 tons.
   • Advantages: Easy to control pile quality, fast construction.
2. Prestressed centrifugal pile foundation:
   • Piles are produced by centrifugal method, have high intensity.
   • The load of each pile can be up to several hundred tons, even thousands of tons.
   • Advantages: High load capacity, high durability.
3. Bored pile foundation:
   • Piles are constructed by drilling holes in the ground, then placing steel cages and pouring concrete directly at the location.
   • Pile diameter can be from 40cm to 3m.
   • Advantages: Suitable for large projects, narrow construction conditions, can reach great depth.

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Advantages and disadvantages of pile foundation

Advantages of pile foundation

• Large load capacity: Meet projects of various sizes and loads.
• High durability and stability: Ensure safety and long life for the project.
• Diversity in types and construction methods: Suitable for many geological and ground conditions.
• Reasonable construction time: Compared to other deep foundation solutions.
• Less dependent on groundwater levels: Safer during earthworks.
• Good quality control (especially with precast piles): Materials and manufacturing processes are strictly controlled.

Disadvantages of pile foundation

• Higher cost than shallow foundation: Requires specialized techniques and machinery.
• Difficulty in construction in narrow spaces: Especially with large pile drivers. There needs to be a suitable “homemade” machine solution but still must ensure the technique.
• Requires thorough geological survey: To select the appropriate pile type and depth.

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Basic pile foundation calculation process

Pile foundation calculation is a complex process that requires specialized knowledge. Here are the basic steps:

1. Determine the construction load: Calculate the total static load (self-weight of the structure, walls, floors, etc.) and live load (people, furniture, equipment, etc.) transmitted to each column foot.
2. Engineering geological survey: Collect data on soil layers and physical and mechanical indexes (SPT, etc.) to determine good soil layers with load-bearing capacity.
3. Select pile type and preliminary number of piles: Based on load and geological conditions, experience to choose pile type (RC, centrifugal, bored) and estimate the number of piles for each pile.
4. Calculation of load bearing capacity of single pile: Based on theoretical formulas and geological data, calculate the load-bearing capacity of a pile (according to material and ground).
5. Arrange piles in the foundation and check: Arrange piles in the pile cap to ensure minimum spacing (usually 3D-6D, where D is the pile diameter/edge) to avoid grouping effect. Recheck the number of piles based on the total load and the single pile bearing capacity.
6. Pile foundation design: Determine the dimensions (length, width, height) and calculate the reinforcement for the pile cap to withstand bending, shear and puncture forces.
7. Foundation beam design: Calculate the size and reinforcement for the foundation beam to connect the pile caps, withstand bending moments and shear forces due to differential settlement or horizontal loads.

Serious mistakes to avoid when constructing pile foundations

Pile foundation construction requires precision and strict adherence to technical standards. Below are common mistakes that homeowners and contractors should pay special attention to:

Errors related to piles

• Same number of piles for every foundation: The load at different column locations is different, so the number of piles must also be different. Equalizing the number of piles can lead to excess piles in low-load areas and shortage of piles in high-load areas, causing waste or unsafety.
• Do not calculate pile burial depth: Piling that does not reach good soil layer or is not deep enough will cause the pile to not reach the required load-bearing capacity.
• Wrong type of pile selected: Large loads but choosing piles with small bearing capacity will lead to pile destruction.
• Ignore pile group effects: When piles are driven too close together, the load-bearing capacity of the group is reduced relative to the sum of the load-bearing capacities of the individual piles.
• No control over pile and pile joint quality: Poor quality piles and welds that do not meet technical standards will reduce the working capacity of the pile.
• Construction machinery is not inspected and lacks supervision: Leading to errors in the pile driving process (depth, pressure).

Errors related to pile cap

• Same pile cap size for all positions: Similar to the number of piles, the size of the foundation depends on the number and arrangement of piles.
• Insufficient pile cap height: Does not guarantee bending and shear resistance, especially puncture resistance from pile heads.
• Wrong arrangement of the pedestal steel (off-center, on-center): Eccentric foundations usually require more top steel, while centered foundations require the bottom steel to bear the main load. Mistakes can be dangerous.
• Wrong positioning of pile and foundation center: Leads to unwanted eccentricity, affecting the overall structure.

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Errors related to foundation beams (foundation beams)

• Ignore or underestimate the role of foundation bracing: No construction or construction done carelessly, not enough steel.
• Do not calculate the foundation beam as a load-bearing member: Foundation ties are subjected to significant bending moments and shear forces, especially when differential settlement is present.
• Construction of foundation bracing is not guaranteed: Wrongly placed steel, inadequate concrete grade, poor maintenance.

Don't forget: Apply for a building permit before starting pile driving.

Choose a reputable pile foundation construction unit

Through the above analysis, it can be seen that pile foundation is an extremely important item, requiring careful calculation and professional construction. The selection of construction contractor reputable, experienced as XHOME Saigon will help you:

• Quality assurance: Ensure pile foundation is calculated correctly and constructed according to technical standards.
• Cost optimization: With BIM technology deeply applied, with a team of experienced engineers. XHOME Saigon helps you avoid mistakes that cause waste or expensive repair costs later.
• Guaranteed progress: With a team of skilled engineers, architects and workers, professional working process, XHOME Saigon ensures construction progress including rough and finished parts. home finishing.

At XHOME Saigon, we not only provide services interior design but also a complete construction unit, with deep understanding of structures, especially complex foundation solutions such as pile foundations. We are committed to bringing our customers works that are not only aesthetically beautiful but also solid over time.

See more: Top best turnkey home construction companies in HCMC , What is MEP?

In short, get it right What is pile foundation? and related factors are the first step for you to make wise decisions for your home. Do not hesitate to invest in a quality foundation, because that is the guarantee for the safety and sustainable value of your home.

If you are planning to build and need more detailed advice on pile foundation solutions or other issues related to design and construction, please contact us. Contact XHOME Saigon now here Hotline: 0899.199.786 or access Website: xhomesg.com.vnWe are always willing to listen and accompany you!