Underpinning

Definition

Underpinning is the process of strengthening and stabilizing the foundations of an existing structure by placing new foundations beneath it.

Purpose

Underpinning is used to reinforce foundations that have become unstable or are unable to support the structure adequately. This can be due to various factors, including soil subsidence, changes in building use, or construction defects.

Examples of Use

• Foundation Repair: Strengthening a building's foundation that has settled unevenly due to soil conditions.
• Structural Upgrades: Enhancing the load-bearing capacity of a foundation to support additional floors or extensions.
• Historic Preservation: Stabilizing old buildings to prevent structural failure and preserve historical integrity.

Related Terms

• Foundation Settlement: The downward movement of a building's foundation due to soil compaction or other factors.
• Pile Foundation: Deep foundations used to transfer building loads to stable soil layers.
• Soil Stabilization: Techniques used to improve the properties of soil to support foundations better.

Notes

Underpinning projects require careful planning and engineering expertise to ensure safety and effectiveness. Each project is unique and may involve different underpinning techniques based on the specific conditions and requirements.