a vertical bore to be quite dry for a number of feet in depth then to become wet and perhaps dry again a failing of the existing piling art is that the same amount of cement is often injected at every depth without regard to the existing water content providing binder which is not reacted reasonably promptly provides little ultimate structural advantage for this reason many unearthed in situ pilings are found to be essentially unreinforced because the binder did not cure or was only locally reacted which used up all of the available water similarly in very pervious formations such as very sandy formations supplied water may have drained away before being useful to the binder for curing purposes the terms u201c curing u201d and u201c hydration u201d are used interchangeably in this specification it means whatever reaction occurs in the hardening of a powdered binder such as cement and or lime to form from a mixture of water and powder in to a body that acts as a u201c paste u201d to bind aggregate together as a solid body the precise chemical nature of the reaction is not important what is important is the solid result often spoken of as a cured or hydrated body the objective of this invention is to produce in soil structure 11 an in situ piling 12 that extends.