Flame drill channelling method and apparatus for reducing noise

Boring or penetrating the earth – Boring by directly applying heat to fluidize or comminute – Combustion is confined chamber having restricted discharge...

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175209, E21B 714

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active

043196470

ABSTRACT:
Chanelling in rock quarries with reduced noise level is effected by flame drilling side by side holes separated by a web with the web sufficiently thin to allow easy subsequent breakage, preferably where the web is badly heat damaged and cracked through. Water injection acts together with the muffler effect with drilling restricted to individual holes separated by the web to significantly reduce noise levels. The flame drill is preferably additionally provided with a muffler of "folded" design to increase the gas flow path over a short vertical dimension. The muffler may comprise multiple concentric tubes with the inner of the tubes bearing holes for transmitting flow radially of longitudinal flow paths defined by opposed concentric tube walls. A refractory cloth annulus secured to the top of the muffler may be spring held to the stem of the flame drill assembly. A tubular multi-layer refractory cloth seal end to end affixed to the muffler and facing the rock formation limits escape of noise and dust at the flame impact area with the edge of the tubular cloth seal forcibly pressed against the rock surrounding the hot gas and abrasive particle impringement area.

REFERENCES:
patent: 2341322 (1944-02-01), Hubbell
patent: 2675993 (1954-04-01), Smith et al.
patent: 2693937 (1954-11-01), Wyland, Jr.
patent: 3467206 (1969-09-01), Acheson et al.
patent: 4029160 (1977-06-01), Leidvik

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