US PATENT SUBCLASS 405 / 150.2
.~.~ By spraying of settable material (e.g., concrete)

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

132  DF  UNDERGROUND PASSAGEWAY, E.G., TUNNEL {6}
150.1  DF  .~ Lining {2}
150.2.~.~ By spraying of settable material (e.g., concrete)

DEFINITION

Classification: 405/150.2

By spraying of settable material (e.g., concrete):

(under subclass 150.1) Subject matter wherein the wall, ceiling or floor structure is formed by projecting hardenable material onto the interior of said tunnel.

SEE OR SEARCH CLASS

264, Plastic and Nonmetallic Article Shaping or Treating: Processes,

31+, for forming structural installations in situ.