underpin - meaning and definition. What is underpin
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  3. underpin

What (who) is underpin - definition

PROCESS OF STRENGTHENING THE FOUNDATION OF AN EXISTING BUILDING OR OTHER STRUCTURE
Underpin; Needle beam; Needling; Needle Beam; Underpinned

underpin         
  • Sketch of a cast in situ RC cantilever needle beam on micro piers or piles. Access to inside not needed.
  • Sketch of a standard needle beam on micro piers or piles. Inside access needed.
  • Sketch of concrete pier underpinning with the possibility of raising foundations.
  • Sketch showing the traditional method of needling a wall to reduce the weight on the foundations during underpinning work.
  • Underpinning the foundations of a railway bridge using a timber box crib to support the bridge. A completed concrete pad underpinning can be seen at the bottom right.]
  • Drilling machines using jet grouting
  • Close to the drilling head
¦ verb (underpins, underpinning, underpinned)
1. support (a structure) from below by laying a solid foundation or substituting stronger for weaker materials.
2. support, justify, or form the basis for.
Derivatives
underpinning noun
Underpin         
  • Sketch of a cast in situ RC cantilever needle beam on micro piers or piles. Access to inside not needed.
  • Sketch of a standard needle beam on micro piers or piles. Inside access needed.
  • Sketch of concrete pier underpinning with the possibility of raising foundations.
  • Sketch showing the traditional method of needling a wall to reduce the weight on the foundations during underpinning work.
  • Underpinning the foundations of a railway bridge using a timber box crib to support the bridge. A completed concrete pad underpinning can be seen at the bottom right.]
  • Drilling machines using jet grouting
  • Close to the drilling head
·vt To support by some solid foundation; to place something underneath for support.
II. Underpin ·vt To lay stones, masonry, ·etc., under, as the sills of a building, on which it is to rest.
underpin         
  • Sketch of a cast in situ RC cantilever needle beam on micro piers or piles. Access to inside not needed.
  • Sketch of a standard needle beam on micro piers or piles. Inside access needed.
  • Sketch of concrete pier underpinning with the possibility of raising foundations.
  • Sketch showing the traditional method of needling a wall to reduce the weight on the foundations during underpinning work.
  • Underpinning the foundations of a railway bridge using a timber box crib to support the bridge. A completed concrete pad underpinning can be seen at the bottom right.]
  • Drilling machines using jet grouting
  • Close to the drilling head
(underpins, underpinning, underpinned)
If one thing underpins another, it helps the other thing to continue or succeed by supporting and strengthening it.
...mystical themes that underpin all religions...
VERB: V n
• underpinning (underpinnings)
...the economic underpinning of ancient Mexican society.
...the violent woman-hating underpinnings of films like 'Cape Fear'.
N-VAR

Wikipedia

Underpinning

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.

https://en.wikipedia.org/wiki/Underpinning
Examples of use of underpin
1. This fundamental truth must underpin any new arrangements."
2. Five major elements underpin the new Shia revival.
3. But it is heavily reliant on wholesale foreign funding to underpin its aggressive business model.
4. Independent budget experts cautioned that a number of debatable assumptions underpin the White House‘s deficit projections.
5. Labour neither understand nor share the values that underpin the way we do things in Britain.
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