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Underpinning is a technique used to reinforce and restore the foundation of a building. By underpinning, existing buildings and infrastructures can have their weak foundations strengthened. One such method is adding permanent or temporary support to an existing base to increase its depth and load capacity.
Underpinning may be accomplished by extending the foundation in depth or breadth so it either rests on a more supportive soil stratum or distributes its load across a greater area. Use of micropiles and jet grouting are common methods in underpinning.

How to construct underpinning?
Steps for Underpinning a Foundation
• Step 1: Excavation. The process of underpinning starts with excavation. ...
• Step 2: Preparation. In case the method to be applied is mass pour, concrete will be poured through a hole around and/or under the foundation. ...
• Step 3: Reinforcement. ...
• Step 4: Infilling. ...
• Step 5: Repairs.

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