The underpinning of a foundation in construction and civil engineers is an essential process that strengthens and stabilises the existing foundations RECTIFY. This technique can be used when an original foundation is not able to support a structure, whether due changes in soil, increased load requirements or structural damage. Understanding the benefits and methods of underpinning will help property and building owners to maintain their structures’ integrity and safety.
Why Underpinning of the Building is Required
Underpinning can be required for many reasons. One of the most common reasons for underpinning a foundation is soil subsidence. It can be due to soil shrinkage from natural causes, erosion, and changes in the groundwater level. The soil can also be disturbed by nearby construction activities like excavation or heavy equipment operation. In addition, buildings that are being extended or modified with heavier materials or additional floors may need underpinning in order to support their increased weight.
The Methods of Supporting
Underpinning can be done in a variety of ways, depending on the soil type and conditions. The most popular techniques include:
1. **Mass Concrete Foundation**: In this method, sections are excavated and filled with concrete. The process of underpinning the foundation is repeated, in stages. This method can be used for shallow, continuous foundations.
2. **Beam Method**: Here, a reinforced beam of concrete is built beneath or alongside an existing foundation. The beam transfers its load onto a series or concrete bases installed at intervals. This method can be used for foundations that are deeper and distributes loads more evenly.
3. **Minipiled Underpinning** Mini-piles – small diameter piles driven into the soil – are used to support foundations. This is a great method for sites with limited accessibility or variable soil conditions. Mini-piled underpinning is a method that can reach deeper and support structures with greater weight.
4. **Resin injection**: A newer technique that involves injecting strong resins into the ground underneath the foundation. The resin expands when it is injected into the ground, stabilizing and lifting the foundation as necessary. This method involves less disruption and is quicker than other underpinning techniques.
Conclusion
Underpinning is an important process that ensures the longevity and security of a construction. Underpinning ensures a stable base by addressing issues like soil submersion, increased load requirements and structural damages. Structural engineers can help property owners and contractors determine the best underpinning methods for their individual needs. Underpinning can be used to improve foundation stability with proper planning.
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