Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1979-11-29
1982-06-22
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring with specific fluid
175249, 175323, E21B 1044, E21B 1722, E21B 2100
Patent
active
043357938
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a process of boring sites in the presence of liquids; particularly for the formation of foundations; of mineral prospectings, etc., the boring being done by a rotating tool as well as by a gripping tool.
Boring in the presence of liquids includes all boring conducted in aqueous sites and/or in dry sites but with the introduction of fluids such as bentonite muds, chemical compounds, grout, etc. The process according to the invention comprises, in its general aspect, separating, in the course of the boring operation, the excavated material and the surrounding liquids by storing the excavated material in an interior volume provided on the interior of the tool and by permitting a controlled circulation of the liquids outside of the interior volume in a reserve volume for the excavated material.
Thus, during the boring operation itself, one assures the circulation of the liquids towards the lower portion of the excavation created and more particularly in such a fashion that the face being excavated is continually and conveniently lubricated.
Likewise, during the descent and raising of the boring tool before and after the boring operation itself, one promotes according to the invention respectively the raising of the liquids towards the top of the excavation or the descent of the liquids towards the end of the excavation thus avoiding the piston effect caused by the displacement of the tool.
According to a preferred aspect of the invention, the circulation of the liquids occurs in a volume provided between the tool and the lateral wall of the excavation.
Furthermore, one preferably assures a forced circulation of the liquids in the reserve volume which is reserved for them.
In the particular instance where the boring is created by virtue of a turning tool, at least during the boring operation itself, one creates the circulation of the liquids towards the bottom by guiding them along a substantially descending helicoidal trajectory.
Furthermore, during the descent of the tool before the boring operation itself, one causes, by virtue of the displacement of the tool, a circulation of the liquids towards the top, in the opposite direction of the displacement of the tool and preferably along a substantially ascending helicoidal trajectory.
Conversely, during the raising of the tool after the boring operation itself, the circulation of the liquids towards the bottom is caused, by virtue of displacement of the tool, in the opposite direction of the latter along a substantially descending helicoidal trajectory.
The invention relates equally to a boring tool adapted in a fashion so as to make possible to perform the above process and comprising at least
a container defining a closed interior volume, this container being provided with retainer means permitting the introduction of the excavated materials in the interior volume while forbidding their exit,
emptying means for evacuation of the interior volume of the container which is controlled by a voluntary control system,
at least one cutting element which, at least in the boring position, projects to the exterior of the container in a fashion so as to result in an excavation having transverse dimensions greater then the tranverse dimensions of the container,
and circulating means for circulating, during the boring operation, the liquids found in the excavation, outside of the volume of the container reserved for the excavated material.
Advantageously, the means assuring the circulation of the liquids are provided with a reserve volume between the walls of the excavation and the lateral wall adjacent to the container of the tool which defines the volume reserved for the excavated material, this volume reserved for the liquids being, according to one preferred embodiment, arranged in a fashion so as to permit a circulation of the liquid such that the liquid assures a constant lubrication of the working elements of the tool without them having damaging effects during the displacement of the tool part
REFERENCES:
patent: 1740449 (1929-12-01), Blakeslee
patent: 1997313 (1935-04-01), Satre
patent: 2197580 (1940-04-01), Jensen et al.
patent: 2537605 (1951-01-01), Sewell
patent: 2587231 (1952-02-01), Schierding
patent: 2865608 (1958-12-01), McKenna
patent: 2873950 (1959-02-01), Kandle
Novosad Stephen J.
Soudure et Mecanique Appliquees du val Notre-Dame
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