Underpinning house foundations with hollow bars is a technique used in foundation repair and stabilisation. The process involves drilling hollow steel bars, often referred to as micro-piles into the ground beneath the existing foundation to provide additional support and stability.
Underpinning is typically required when a foundation has experienced or is at risk of experiencing issues outlined in the information below.
This occurs when the soil beneath a foundation compress or consolidates, causing the foundation to sink or settle unevenly.
Cracks appear in the foundation walls or floors due to settlement and movement and almost indicate underlying structural issues.
If a foundation is subjected to excessive lateral forces it can result in some movement.
In some cases, the original foundation design may not have been sufficient to support the load of the structure.
Changes In Soil Conditions
If the soil composition or moisture content around a foundation changes, it can affect the stability and load-bearing capacity of the foundation.
An overview of how the underpinning process with Ischebeck Titan hollow bars works:
Soil conditions: Hollow bar underpinning is suitable for a wide range of soil conditions, including soft or loose soils, expansive clay, and even bedrock.
Load-bearing capacity: Hollow bar underpinning can provide significant load-bearing capacity. The load transfer mechanism, where the weight of the structure is distributed to the deeper, stable soil layers through the bars, helps strengthen the foundation and minimize settlement or movement.
Accessibility and space constraints: Underpinning with hollow bars can be a suitable option in situations where space is limited or access to the foundation is challenging. The smaller equipment and machinery used for installation make it more feasible in tight spaces compared to other methods that require larger equipment or extensive excavation.
Cost-effectiveness: The cost of underpinning with hollow bars can vary depending on factors such as the extent of foundation damage, soil conditions, and the size of the structure.
Structural requirements: Hollow bar underpinning can be designed to meet specific structural requirements, such as increasing foundation stability, redistributing loads, or preventing further settlement.
It is important to note that the effectiveness of any foundation repair method, including underpinning with hollow bars, depends on a thorough assessment by a qualified professional.
They will consider factors such as soil conditions, structural requirements, and the specific challenges of your foundation to determine the most appropriate and effective solution for your situation.
Ischebeck Titan Micropiles as per Eurocode are not end-bearing piles.
Friction micropiles, from Ischebeck Titan, develop their load-bearing capacity through skin friction between the pile shaft and the surrounding soil or rock. This type of micropile relies on the bond between the grout and the soil to transfer the load to the ground.
In practice, micropiles are designed to utilize friction resistance, depending on the specific soil, and loading conditions. The selection of the appropriate type of micropile will depend on factors such as the soil or rock conditions, the required load capacity, and the site constraints.
Ischebeck Titan hollow bars typically are manufactured in lengths of 3 or 4m. In tight, inconvenient situations, hollow bars may need to be shorter. The continuously threaded Ischebeck bar can be cut and coupled at any point, easily accommodating 1.0m, 1.5m, and 2m lengths.
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