Underpinning

What is Underpinning?

In construction or renovationunderpinning is the process of strengthening the foundation of an existing building or other structure. Underpinning may be necessary for a variety of reasons:

  • The original foundation isn’t strong or stable enough.
  • The usage of the structure has changed.
  • The properties of the soil supporting the foundation may have changed (possibly through subsidence) or were mischaracterized during design.
  • The construction of nearby structures necessitates the excavation of soil supporting existing foundations.
  • To increase the depth or load capacity of existing foundations to support the addition of another storey to the building (above or below grade).
  • It is more economical, due to land price or otherwise, to work on the present structure’s foundation than to build a new one.

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[1] and jet grouting are common methods in underpinning. An alternative to underpinning is the strengthening of the soil by the introduction of a grout, including expanding urethane-based engineered structural resins.

Underpinning may be necessary where P class (problem) soils in certain areas of the site are encountered.

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      Core Drilling Specialists Ltd are experts within the concrete drilling and sawing industry , with over 30 years of the company’s experience. C.D.S. provides professional services to both the construction and demolition industries, throughout Scotland and the UK.

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