Grout or mortar removal by laser

Timothy Spencer, Julian (Inventor), Lin Li (Inventor), Jonathan Lawrence (Inventor)

Research output: Patent

Abstract

The method comprises the steps of directing the beam of a portable laser device (40) onto grout (14) at a power level to cause removal of the grout; causing mutual relative movement between said laser beam and said grout; and, providing removal means (30, 32) for debris resulting from said grout removal. The laser beam (16) is transmitted to the grout (14) via optical fibre. The laser is selected from the group comprising: Nd-YAG laser; semi-conductor laser; and, diode pumped fibre laser, and may also include a low-power visible aiming laser. An area of grout being treated is surrounded by an enclosure (22) to prevent escape of laser light. The enclosure is transparent to optical light and opaque to laser light of the wavelength, e.g. 0.4 to 10.6 mu m, in use. The laser beam spot (18) size being commensurate with the grout width. Debris removal means, possibly assisted with a gas jet (42), comprises suction removal (44) at a position adjacent the grout laser treatment area. The method may include the step of applying additional water to the grout.

Original languageEnglish
Patent numberWO9748536A1
IPCB28D 1/ 22
Priority date11/07/96
Filing date18/06/97
Publication statusPublished - 24 Dec 1997

Fingerprint

grout
lasers
laser beams
enclosure
debris
gas jets
suction
escape
fiber lasers
YAG lasers
optical fibers
semiconductor lasers
diodes

Cite this

Spencer, Julian, T., Li, L., & Lawrence, J. (1997). IPC No. B28D 1/ 22 . Grout or mortar removal by laser. (Patent No. WO9748536A1).

Grout or mortar removal by laser. / Spencer, Julian, Timothy (Inventor); Li, Lin (Inventor); Lawrence, Jonathan (Inventor).

IPC No.: B28D 1/ 22 . Patent No.: WO9748536A1. Jun 18, 1997.

Research output: Patent

Spencer, Julian, T, Li, L & Lawrence, J Jun. 18 1997, Grout or mortar removal by laser, Patent No. WO9748536A1, IPC No. B28D 1/ 22 .
Spencer, Julian T, Li L, Lawrence J, inventors. Grout or mortar removal by laser. B28D 1/ 22 . 1997 Dec 24.
Spencer, Julian, Timothy (Inventor) ; Li, Lin (Inventor) ; Lawrence, Jonathan (Inventor). / Grout or mortar removal by laser. IPC No.: B28D 1/ 22 . Patent No.: WO9748536A1. Jun 18, 1997.
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AB - The method comprises the steps of directing the beam of a portable laser device (40) onto grout (14) at a power level to cause removal of the grout; causing mutual relative movement between said laser beam and said grout; and, providing removal means (30, 32) for debris resulting from said grout removal. The laser beam (16) is transmitted to the grout (14) via optical fibre. The laser is selected from the group comprising: Nd-YAG laser; semi-conductor laser; and, diode pumped fibre laser, and may also include a low-power visible aiming laser. An area of grout being treated is surrounded by an enclosure (22) to prevent escape of laser light. The enclosure is transparent to optical light and opaque to laser light of the wavelength, e.g. 0.4 to 10.6 mu m, in use. The laser beam spot (18) size being commensurate with the grout width. Debris removal means, possibly assisted with a gas jet (42), comprises suction removal (44) at a position adjacent the grout laser treatment area. The method may include the step of applying additional water to the grout.

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