Shaft drilling rig

Details Shaft drilling rig Shaft drilling rig

1983-12-14

1986-06-17

Novosad, Stephen J.

Boring or penetrating the earth

With orienting or racking means for unconnected tools or...

E21B 1920

Patent

active

045950652

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

(A) Field of the Invention
The present invention relates to a shaft drilling rig, and more particularly to a shaft drilling machine with which a force of rotary drilling and thrust are imparted to at least a drill bit of a drill string to drill a shaft, slush produced due to the drilling is drained together with soil and sand by forward or reverse circulation, and after having drilled the earth to an predetermined depth, a axial portion of the drill string is disconnected and a new sectional drill pipe member is added to the drill string, for further boring the earth.
The shaft referred to herein includes a vertical and inclined ones drilled in the earth.
Also, the shaft drilling rig referred to herein is used for drilling directly a shaft in the earth by the drill string as well as for drilling a shaft inside a steel pipe previously driven into the earth by a pile driver in order to prevent the hole wall from collapsing and also to guide the stabilizer of the drill string.
Said drill string includes two types: One is such that a turning force of drilling and thrust are given to the almost the whole drill string in order to drill the earth, and the other is such that a turning force of drilling and thrust are imparted to only the drill bit for such drilling. Generally, the former type of drill string comprises a swivel joint, kelly bar formed non-cylindrical or square for enabling the transmission of the turning force from a turning drive for the drill string and the axial movement of the drill string, a plurality of drill pipes to be prepared according to the depth of a shaft to be drilled, a stabilizer as a guide member for steady rest of the drill string, drill collar to impart a weight to the drill string, and a drill bit, which are appropriately coupled together. On the other hand, the latter type of drill string which provides for a drilling motion with a turning force of drilling and thrust given to only the drill bit, is generally composed of a plurality of drill pipes to be prepared according to the depth of a shaft to be drilled, stabilizer, drill bit, and means for imparting the turning force of drilling and thrust to the drill bit, which are also appropriately coupled together, and further it is provided, depending upon the solidity of the ground, with a drill collar or gripper which accomodates a reaction to the thrust of the drill string. These members will be referred to as "components of the drill string or drill string components" anywhere in the subsequent text of this specification. Among the above drill string components, tubular ones are so formed as to have a nearly the same inside diameter for the purpose that fluid or slush produced due to the drilling should be smoothly passed therethrough.
The above-mentioned forward circulation method drilling is generally such that a circulating water is fed by a mud water pump into a pipe laid inside or along the drill string, the mud water discharged from below the drill bit to the bottom of the drill hole (shaft) is circulated through between the outer circumferential surface of the drill string and drill hole (shaft) to outside of the drill hole (shaft), and the mud water thus running is utilized to evacuate the sand and water drilled by the drill bit to outside of the drill hole (shaft) while further drilling the earth. On the other hand, the drilling of reverse circulation method is generally such that the slush consisting of mud water is lifted and discharged through the drill string while further drilling the earth. The embodiments of the present invention will be described later with reference to this drilling of reverse circulation method by way of example. However, it will be apparent to those skilled in the art that the shaft drilling rig according to the present invention can be applied to both the forward and reverse circulation methods.
Also the present invention can be applied to a shaft drilling rig of such as type that drill string is supported on frames installed on a leader in order to drill a ver

REFERENCES:
patent: 3446284 (1969-05-01), Dyer et al.
patent: 3650339 (1972-03-01), Selfe et al.
patent: 3741322 (1973-06-01), Wolters
patent: 3902561 (1975-09-01), Friberg et al.
patent: 3961673 (1976-06-01), Wolters et al.
patent: 3994350 (1976-11-01), Smith et al.
patent: 4421179 (1983-12-01), Boyadjieff

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