Expansible apparatus for removing the surface layer from a concr

Details Expansible apparatus for removing the surface layer from a concr Expansible apparatus for removing the surface layer from a concr

1978-02-24

1979-05-01

Purser, Ernest R.

Mining or in situ disintegration of hard material

Expansible breaking-down devices

Wedge

E21C 3702

Patent

active

041520289

ABSTRACT:
A method and apparatus for removing the surface layer from a concrete object. The method consists of providing a hole having a circular wall in the surface layer of the object, the hole being at least as deep as the thickness of the surface layer to be removed, and applying an outward wedging pressure on the wall of the hole sufficient to spall the surface layer around the hole. By the proper spacing of an appropriate number of holes, it is possible to remove the entire surface layer from an object. The apparatus consists of an elongated tubular-shaped body having a relatively short handle with a solid wall at one end, the wall of the remainder of the body containing a plurality of evenly spaced longitudinal cuts to form a relatively long expandable section, the outer end of the expandable section having an expandable, wedge-shaped spalling edge extending from the outer surface of the wall, perpendicular to the longitudinal axis of the body, and expanding means in the body for outwardly expanding the expandable section and forcing the spalling edge into the wall of a hole with sufficient outward pressure to spall away the surface layer of concrete. The method and apparatus are particularly suitable for removing surface layers of concrete which are radioactively contaminated.

REFERENCES:
patent: 345696 (1886-07-01), Hudson et al.
patent: 900003 (1908-09-01), Veitch
patent: 3565488 (1971-02-01), Walsh

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