(under subclass 266) Method or apparatus in which the settable material is introduced into a preformed or existing subterranean cavity to form a barrier or similar construction within the formation, wherein the walls of the cavity define the shape of the finished construction.
(1) Note. The settable material must directly contact the earth. Hence, the use of a form to construct an underground concrete wall would preclude placement of a patent herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
109, for a dam or levee having an impervious core or a method of construction the same.
229, for a method of strengthening a deteriorated foundation by filling voids therein with cement.
233+, for methods and apparatus for casting foundation piles in situ.
275, for concrete sheet piles which are either precast or are cast in situ by using a shaping means (form) other than an earthen cavity.
