Boring or penetrating the earth – Boring without earth removal
Patent
1990-01-12
1991-07-16
Dang, Hoang C.
Boring or penetrating the earth
Boring without earth removal
175 55, 175 94, 175323, E21B 724, E21B 726
Patent
active
050317075
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to construction technology, and, more specifically, it deals with apparatuses for making holes in soil by expansion rolling. Such apparatuses may be used for underground soil compaction and also for forming cast-in-place piles, for trenchless construction of pipelines, for the construction of footings for power transmission lines supports, and the like.
DESCRIPTION OF THE RELATED ART
Known in the art are several types of apparatuses for making holes in soil. Thus known in the art is an apparatus (SU, A 825,797) having an eccentric shaft with rolls, one roll being operatively connected to the shaft of a motor having its casing connected to the eccentric shaft, the rolls being connected to one another by means of flexible members.
The apparatus is deficient in that it can only be operable when angular velocities of all the rolls are identical. This can only be achieved if the relative eccentricities of all the rolls are identical (the absolute eccentricities of the rolls are directly proportional to their diameters) which substantially affects the advance speed of the apparatus. In practice the advanced speed decreases by several times and the apparatus can even stop altogether under unfavorable conditions, e.g. upon a change in soil structure or moisture content.
Also known in the art is an apparatus (SU, A, 977613), comprising an eccentric shaft having rotatable rolls mounted thereon which are connected to one another by means of a flexible member for their sealing, and metal rings connected to the flexible member and engageable with the end of the rolls.
This construction of the end seal of the rolls cannot rule out penetration of fluid soil and moisture to the interior spaces of bearings thus shortening service life of the apparatus.
During operation of the apparatus in wet soils, ground water containing soil particles penetrates through clearance between the rotating rolls and metal rings to the interior space of the apparatus.
The construction of the end seal between the rolls cannot ensure uniform pressure of the metal rings against the end faces of the rolls so that one of the rings can move open, and water with soil particles will get into the interior of the apparatus.
In addition, when soil particles get into these clearances, one of the metal rings may be jammed. In this case, the difference between angular velocities of the adjacent rolls may cause breakage of the collar (flexible member).
SUMMARY OF THE INVENTION
The invention is based on the problem of providing an apparatus for making holes in soil which is so constructed as to prolong its service life by preventing moisture and soil particles from getting into its interior spaces.
This problem is solved by an apparatus for making holes in soil, comprising an eccentric shaft having rolls mounted thereon for rotation and connected to one another by means of flexible members for end sealing of the rolls and metal rings. According to the invention, there are provided auxiliary members for radial sealing of the rolls, the rolls being hollow, the auxiliary flexible members being received in a radial clearance defined between the adjacent rolls, the flexible members for end sealing being made in the form of a corrugated collar.
The metal rings surround the corrugated collars and are engageable with the adjacent rolls with their sharp edges.
This construction rules out penetration of water and soil particles to the interior of the apparatus, hence, in bearings.
The construction of the end seal between the rolls ensures uniform pressure of the metal rings against the end faces of the rolls because the corrugated collar is mounted coaxially with the working member by means of shoulders on the end faces of the rolls, the inside diameter of the shoulders being greater than the outside diameter of the metal rings by an amount equal to two times the eccentricity "e". The inner surface of the shoulders is conical. With a radial movement of the rolls with respect to the colla
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patent: 4230191 (1980-10-01), Svirschevsky et al.
patent: 4484640 (1984-11-01), Feklin et al.
Uplotnenia i Uplotnitelnaya tekhnika, pp. 166-168, 1986.
Osnovy Konstruirovania, vol. 1; pp. 486-490; 1988.
Prokhodka skvazhin v grunte sposobom raskatki, 1982.
Osnovy Konstruirovania, vol. 2, pp. 352-353; 1988.
Bobylev Leonid M.
Gerasimenko Nikolai P.
Gokhman Yakov A.
Klimov Nikolai J.
Kovalev Alexandr S.
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