by The underpinning or stabilisation of existing foundations is a vital process for civil engineers and construction workers continued. This technique may be used when a original foundation is unable to support a structural load, due to soil changes, increased loads or structural damage. Understanding the benefits and techniques of underpinning helps property and building owners maintain their structure’s integrity and safety.
Why underpinning is necessary for a building
Underpinnings can be needed for many reasons. One of the more common reasons to support a foundation is because of soil subsidence. It may be due to soil shrinkage, erosion, or a change in the level below groundwater. This can be due to nearby construction activity such as excavation or heavy machinery operation. Underpinning is also needed for buildings that are being upgraded or extended to accommodate heavier materials.
Supporting Families: The Best Methods
Depending upon the soil type and condition, different methods can be used to provide underpinning. The most popular methods include:
1. **Mass Concrete Foundation** – In this method, sections of the foundation are excavated into which concrete is poured. The foundation is underpinned in successive stages. This method may be used with shallow, continuous and thin foundations.
2. **Beam Technique**: Here a reinforced concrete slab is built below or beside an existing foundation. The beam is designed to transfer its load on to concrete bases, which are placed in a sequence. This method allows for foundations to be deeper, which distributes loads evenly.
3. **Minipiled Overpinning** Foundations are supported using mini-piles. These piles have a small diameter and are driven deep into the soil. This method works well for sites that are difficult to access or have variable soil conditions. Mini-piled foundations can be used to support structures of greater weight. They also reach deeper.
4. **Resin inject**: A relatively new technique in which resins are injected into the soil beneath the foundation. The resin expands after it has been injected and stabilizes or lifts the foundation. This method requires less disruption and is faster than other underpinning technologies.
Conclusion
Underpinning is a process that is vital to the safety and longevity of any construction. Underpinning can help ensure a strong foundation by addressing issues such as soil saturation, increased loads and structural damages. Property owners and contractors can benefit from the expertise of structural engineers in determining which underpinning technique is best for them. The use of underpinning to improve foundation stability can be achieved with the right planning.