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In construction or renovation, underpinning 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 tha

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  • Underpinning (en)
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  • In construction or renovation, underpinning 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 tha (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Cantilever-needle-beam.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Concrete-pier.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/Jet-grouting_(2011)_B.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Jet_grouting_(2011)_A.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Needle-beam.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Needle-wall.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/Underpinning-railway-bridge.jpg
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  • In construction or renovation, underpinning 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. * Earthquake, flood, drought or other natural causes have caused the structure to move, requiring stabilisation of foundation soils and/or footings. 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. 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. Through semantic change the word underpinning has evolved to encompass all abstract concepts that serve as a foundation. (en)
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