JP2001098869A - Excavating method and excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-circular excavating method for excavating a hole having a regular polygonal cross section, without marring the advantage of rotary movement. SOLUTION: There is provided a method for excavating a hole H in a shape of a regular polygon having N apex angles. In this method, an excavating means T is employed which is formed like a regular polygon having N-1 apex angles, with the polygon inscribed in the regular polygon having N apex angles. The excavating means T is rotated along an orbit circle R having a prescribed radius on an excavation center O, at a prescribed rotational speed, and at the same time, rotated about a center G of the excavating means at a prescribed rotational speed, to thereby excavate the hole. In place of the excavating means T which is formed like the regular polygon with N-1 apex angles, a jet may be employed. Alternatively, an excavating means formed like a regular polygon having N+1 apex angles or a drill means can also be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for drilling a hole having a non-circular horizontal cross section in a boring hole excavation operation. More specifically, according to the present invention, when a boring hole is excavated in a ground or the like, for example, the horizontal cross-sectional shape becomes a regular N-corner shape (a shape having N vertex angles and equal lengths on each side). And a drilling method for drilling the boring hole.

[0002]

2. Description of the Related Art First, in connection with the excavation work of a boring hole, when excavating soil using power,
Rotating the drill bit is one of the most effective drilling methods. At this time, the shape of the borehole is naturally circular. However, for some excavation purposes a non-circular shape is desirable. For example, in a tunnel used for a subway or other railways, a rectangular cross section has less waste in excavation (see FIGS. 41 and 42).

[0003] In addition, when the ground is improved by excavating over the entire construction portion of the ground to be improved by vertical boring, as shown in FIG.
In circular drilling, there are many overlapping parts. On the other hand, for example, in the case of drilling a borehole having a hexagonal cross section, FIG.
As shown in FIG. 4, it is possible to perform excavation over the entire area to be constructed without performing duplicate excavation at all.
And since the useless cost by overlapping excavation can be reduced, construction cost can be greatly reduced.

As described above, there are various advantages in excavating a non-circular cross section. However, very little technology is currently available for drilling a wellbore having a non-circular cross section.

[0005] A problem similar to the above-mentioned problem in boring hole excavation also exists when a through hole or a blind hole is cut or ground in a base material. And
Similarly, no effective technique is currently provided for drilling through holes or blind holes having a non-circular cross section.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-described situation, and has an object to excavate a boring hole having a non-circular cross-sectional shape, particularly a regular polygonal cross-sectional shape. It is an object of the present invention to provide a drilling method and a drilling drilling method which makes it possible to drill through holes or blind holes having a non-circular cross section by cutting or grinding.

[0007]

[Knowledge] As a result of research, the inventors have found the following technical matters. (A) Positive (N−) inscribed in a circle of radius (N−1) ² r
1) When the polygon is revolved around the center of the circle at an angular velocity ω while revolving on a circumference of a radius r at an angular velocity (1-N) ω, the sweep range of this regular (N-1) polygon Is the radius N (N-
2) It is a range surrounded by a regular N-corner curve circumscribing the circle of r. (B) A first point at the center, a second point around the center, and a third point around the second point are referred to as a sun S,
When the earth E is compared to the moon M, the moon M at a location (N-1) ² r away from the earth E rotates around the earth at an angular velocity ω, and the earth E is separated therefrom by a distance r. When rotating around the sun S at an angular velocity (1-N) ω, if the sun S is regarded as a fixed point, the trajectory drawn by the moon M will be a positive N circumscribing a circle of radius N (N-2) r. Approximate a square curve. (C) Positive (N +) inscribed in a circle of radius (N + 1) ² r
1) When the polygon is revolved around the circumference of the radius r at an angular velocity (N + 1) ω while rotating at an angular velocity ω about the center of the circle, the sweep range of the regular (N + 1) polygon is the radius N (N +
2) It is a range surrounded by a regular N-corner curve circumscribing the circle of r. In the above findings and the present specification, the positive and negative signs attached to the angular velocities are added to indicate that the rotational directions of the positive and negative angular velocities are opposite to each other. ing.

[0008]

The present invention has been made based on the above findings.

In the excavation method of the present invention, a positive N having an apex angle of N
Drilling a boring hole with a square horizontal cross section
Excavation method has a regular (N-1) square profile
The drill bit is concentric with the center of the borehole and has a radius of “r”.
While revolving around the circumference, rotating at an angular velocity of “ω”,
The straight (N-1) square drill bit has a radius (N-1) ²
 r has a contour inscribed in the circle of r.
1) The angular angular velocity of the angular drill bit is “(1-N)
.omega. "and has a contour of the regular (N-1) square shape.
The sweep range of the cutting bit is outside the circle of radius "N (N-2) r"
It is characterized in that it is in the range of a contacting regular N-gon shape.
According to the excavation method of the present invention having such a configuration,
Based on the knowledge (A)
Drilling holes can be drilled. Drill bit
The sweep range is equivalent to the range drilled by the drill bit
And the radius of “N (N−2) r”
If the range of the regular N-gonal shape circumscribing the circle is swept, the range
Is excavated and a regular N-sided boring hole is excavated
It is.

The drilling method according to the present invention is directed to a drilling method for drilling a boring hole having a horizontal cross-sectional shape of a regular N-sided N-vertex, wherein the boring rod is coaxial with a center line of the boring hole to be drilled. The drilling monitor provided in the above rotates around the boring rod and injects a fluid for drilling the ground (for example, high-pressure water or the like) from a nozzle provided on the periphery of the drilling monitor and rotating around the monitor. ,
When the angular velocity at which the nozzle rotates around the monitor is “ω”, the angular velocity at which the monitor rotates around the boring rod is “(1-N) ω”,
When the monitor has a radial distance apart from the center line of the boring hole of “r”, the reaching distance of the fluid for ground excavation is “(N−1) ² r”, and Excavation range of fluid is radius "N (N-2) r"
Is a range of a regular N-gonal shape circumscribing the circle. According to the present invention having such a configuration, a regular N-sided boring hole is excavated based on the knowledge (B) described above. That is, the center line of the borehole to be drilled corresponds to the sun S in the knowledge (B), the nozzle provided around the monitor corresponds to the earth E, and the ground excavation fluid ejected from the nozzle is The arrival point corresponds to month M. Then, as described in the knowledge (B), as a result of the locus of the reaching point of the ground excavation fluid having a regular N-sided outline, the range in which the ground excavation fluid excavates has a radius of “N (N−2) r. "Is a range of a regular N-gonal shape circumscribing the circle.

Here, it is preferable that the nozzles are provided in pairs, and the fluid for excavating the ground forms a so-called "cross jet". This is because the crossing jet can control the reach of the fluid for excavating the ground with extremely high accuracy. Note that N can be an integer other than 4. Of course, N = 4.

Further, according to the excavation method of the present invention, in an excavation method for excavating a boring hole having a regular N-sided horizontal cross-sectional shape having N apex angles, a drilling bit having a regular (N + 1) -sided contour is formed. While rotating around the circumference of radius “r” concentric with the center of the boring hole, it is rotated at an angular velocity “ω”, and the above-mentioned regular (N + 1) square-shaped excavation bit becomes a circle of radius “(N + 1) ² r”. The revolving angular velocity of the regular (N + 1) square drill bit has an inscribed contour, and the revolution angular velocity of the regular (N + 1) square drill bit is “(N + 1) ω”. "N (N +
2) It is characterized by a range of a regular N-gonal shape circumscribing the circle "r". According to the excavation method of the present invention having such a configuration, the positive (N +
1) The sweep range of the drill bit having the angular contour, that is, the range excavated by the drill bit has a radius “N”.
This is a range of a regular N-gonal shape circumscribing the circle of (N + 2) r ".

In addition to the above, the excavation method of the present invention is a method for excavating a boring hole having a horizontal cross-sectional shape of N regular apexes having N apex angles. The blade-like drilling bit is provided at a radial distance from a boring rod coaxial with the center line of the boring hole to be drilled, using a blade-like drilling bit arranged at equal intervals. Is rotated around the boring rod while rotating, and when the angular velocity at which the blade-shaped drilling bit rotates around the boring rod is “ω”, the angular velocity at which the drilling bit revolves around the boring rod Is (1-N) ω, and the radial distance at which the rotation center of the blade-shaped drill bit is separated from the center line of the boring hole is “r”. ”, The distance from the rotation center of the drill bit to the tip is“ (N−1) ² r ”, and the sweep range of the drill bit is radius“ N (N−2) ”.
r "is a range of a regular N-gonal shape circumscribing the circle. According to the present invention having such a configuration,
Based on the knowledge (B) described above, a regular N-sided boring hole is excavated. That is, the center line of the drilling hole to be drilled corresponds to the sun S in the knowledge (B), the rotation center of the blade-shaped drill bit corresponds to the earth E, and the tip of the blade-shaped drill bit corresponds to the moon M. . As described in the knowledge (B), the trajectory of the tip of the blade-shaped excavation bit has a regular N-gonal outline, and as a result, the sweep range of the excavation bit is a circle having a radius of “N (N−2) r”. Positive N circumscribing to
The range is a square shape.

In the present invention, the cross-sectional shape of the borehole to be drilled is an envelope created by eccentric rotation, and each apex angle is rounded, and each side is a straight line in a strict sense. Can not say. However, in practice, there is no problem in considering that the cross-sectional shape of the excavation hole excavated by the present invention is a regular N-gon.

In the above-described excavation method of the present invention, a boring hole having a regular N-gonal cross-sectional shape in which the side connecting the vertices is (substantially) straight is excavated. Here, for example, there is a case where it is desired to increase the circumferential length of the cross section (the length of the contour of the cross sectional shape) as compared with the cross sectional area like a friction pile. In order to respond to such a demand, the inventor of the present invention has conducted various studies and found that the monitor has a ratio of a radial distance (r) apart from the center line of the borehole to a reach of the ground excavating fluid,
Alternatively, the ratio of the radial distance (r) at which the rotation center of the blade-shaped drilling bit is separated from the center line of the boring hole to the distance from the rotation center of the drilling bit to the tip is “(N−1) ^2. Is smaller than
The cross-sectional shape of the range in which the fluid for ground excavation excavates or the cross-sectional shape of the sweep range of the excavation bit has N vertices and is a curved line (curved line curved toward the center line side of the boring hole). Was found to be a shape composed of a single closed region consisting of Based on such knowledge, if the excavation method of the present invention is configured as described below, the side connecting the vertices is formed by a curved line (curved line curving inward), Thus, it is possible to excavate a boring hole having a cross section having a shape in which the circumference of the contour is long.

That is, in the excavation method according to the present invention, in the excavation method for excavating a boring hole having a horizontal cross-sectional shape of N regular apex having N apex angles, boring coaxial with the center line of the boring hole to be excavated. A drilling monitor provided on the rod rotates around the boring rod, and ejects a fluid for ground excavation from a nozzle provided on the periphery of the drilling monitor and rotating around the monitor, and the nozzle is provided with the monitor. When the angular speed of rotation around the boring rod is “ω”, the angular speed of the monitor rotating around the boring rod is “(1-N) ω”, and the monitor is separated from the center line of the boring hole. The ratio of the reach of the ground excavation fluid to the radial distance is represented by “(N
-1) The cross-sectional shape in a range where the fluid for ground excavation excavates is smaller than ² ", and has N apexes and a curved line (curved line curved toward the center line side of the boring hole).
What is necessary is just to make it the shape comprised from the single closed area which consists of. Alternatively, in an excavation method for excavating a boring hole having a horizontal cross-sectional shape of a regular N-corner having N apex angles, blade-like excavation configured by arranging N blades on a rod at equal intervals in a circumferential direction. Using a bit, a rod of the blade-shaped drilling bit is provided radially spaced from a boring rod coaxial with the center line of the boring hole to be drilled, and revolves around the boring rod while rotating the blade-shaped drilling bit. When the angular velocity at which the blade-shaped excavating bit rotates around the boring rod is “ω”, the angular velocity at which the excavating bit revolves around the boring rod is “(1-N) ω”, The center of rotation of the blade-shaped drill bit is from the center of rotation of the drill bit to the tip with respect to the radial distance away from the center line of the boring hole. In this case, the ratio of the distance in the drilling bit is made smaller than “(N−1) ² ”, and the sectional shape of the sweep range of the drill bit has N vertexes and is curved (curved toward the center line side of the boring hole). (A curved line).

Further, as a result of research, the inventors have found that, if the ratio is further reduced, the cross-sectional shape is constituted by a plurality of closed regions consisting of curves and symmetric with respect to the center of the boring hole. It has been found that drilling holes can be drilled. Based on such knowledge, in the present invention, a drilling monitor provided on a boring rod coaxial with the center line of a boring hole to be drilled rotates around the boring rod, and is provided on a peripheral portion of the drilling monitor, and Injecting fluid for ground excavation from a nozzle rotating around the monitor, and when the angular speed at which the nozzle rotates around the monitor is ω, the angular speed at which the monitor rotates around the boring rod is "(1-N) ω"
The monitor sets the ratio of the reach distance of the ground excavation fluid to the radial distance apart from the center line of the boring hole (further) smaller than “(N−1) ² ”, and The cross-sectional shape of the area excavated by the fluid can be made to be a shape that is composed of a plurality of closed regions formed of curves and that is symmetric with respect to the center of the boring hole.

Further, in the present invention, a blade-shaped drilling bit constituted by arranging N blades at equal intervals in a circumferential direction on a rod is used, and a center line of a boring hole for drilling the rod of the blade-shaped drilling bit is used. A radially spaced apart from the boring rod coaxial with the drilling bit, the blade-shaped drilling bit revolves around the boring rod while rotating, and the angular velocity at which the blade-shaped drilling bit rotates around the boring rod is “ω”. , The angular velocity at which the drill bit orbits around the boring rod is “(1-N) ω”, and the radial distance at which the center of rotation of the blade-shaped drill bit is separated from the center line of the boring hole the ratio of the distance from the rotation center of the drill bit to the tip by (further) smaller than "(N-1) ^2" to wo, The range of cross-sectional shapes whose serial fluid for ground excavation is drilled, it is possible allowed to a shape such as to be symmetrical with respect to the center of the plurality of closed constructed from a region and the borehole curvilinear. Here, the “shape constituted by a plurality of closed regions formed of a curve and symmetrical with respect to the center of the boring hole” means that “the number of a plurality of closed regions” is N , FIG.
This means a double leaf shape as shown in FIG. And when the “plurality of closed areas” is (N + 1),
This means a double leaf shape as shown in FIG.

In order to carry out the above-mentioned excavation method, the excavator of the present invention is configured as follows. An excavator according to the present invention is an excavator for excavating a boring hole having a horizontal cross-sectional shape having a regular N-corner shape with N apex angles, comprising a regular (N-1) square-shaped excavation bit, Has a contour inscribed in a circle of radius (N-1) ² r, revolves around the circumference of radius “r” concentrically with the center of the boring hole, and rotates at an angular velocity “ω” while revolving. The angular velocity is configured to be “(1-N) ω”, and the sweep range of the excavation bit is a range of a regular N angular shape circumscribing a circle having a radius of “N (N−2) r”. It is characterized in that it is configured in a similar manner. The excavator of the present invention having such a configuration applies the above knowledge (A) to excavation of a boring hole or the like. Further, the excavator of the present invention has an apex angle of N
In a drilling device for drilling a boring hole having a horizontal cross-sectional shape of a regular N-gon shape, a boring rod coaxial with the center line of the boring hole to be drilled, and a boring rod provided on the boring rod and rotating around the boring rod. A drilling monitor configured, and a nozzle provided at a peripheral portion of the drilling monitor and ejecting a fluid for ground excavation while rotating around the monitor, wherein the nozzle rotates around the monitor. If the angular velocity at which the monitor rotates is “ω”, the angular velocity at which the monitor rotates around the boring rod is “(1-
N) ω, and when the monitor has a radial distance apart from the center line of the boring hole of “r”, the reaching distance of the fluid for excavating the ground is “(N−1) ² r”.
Wherein the excavation range of the ground excavation fluid is a range of a regular N-gonal shape circumscribing a circle having a radius of “N (N−2) r”. An excavator having such a configuration is based on the above knowledge (B). Here, it is preferable that the nozzles are provided in pairs, and the fluid for excavating the ground forms a so-called “cross jet”. This is because the crossing jet can control the reach of the fluid for excavating the ground with extremely high accuracy. Note that N can be an integer other than 4. Of course, N = 4.

Further, the drilling apparatus of the present invention is a drilling apparatus for drilling a boring hole having a regular N-sided horizontal cross-sectional shape having N apex angles, comprising a regular (N + 1) square-shaped drilling bit. The drill bit has a radius of “(N + 1) ² r”
Has an outline inscribed in the circle of the circle, and concentrically with the center of the boring hole, revolves on the circumference of the radius “r” while revolving on the angular velocity “ω”.
, And the revolution angular velocity is configured to be “(N + 1) ω”, and the sweep range of the drill bit is a radius “N”.
(N + 2) r ". Such an excavator is based on the above knowledge (C).

The drilling apparatus according to the present invention is a drilling apparatus for drilling a boring hole having a horizontal cross-sectional shape of a regular N-sided N-vertex, wherein the boring rod is coaxial with the center line of the boring hole to be drilled. And a blade-shaped drilling bit configured by arranging N blades on the rod at equal intervals in the circumferential direction, the rod of the blade-shaped drilling bit being radially separated from the boring rod. Is provided and configured to revolve while rotating around the drilling bit, and when the angular velocity at which the blade-shaped drilling bit rotates around the boring rod is “ω”, the drilling bit is attached to the boring rod. The angular velocity revolving around the periphery is “(1-N) ω”, and the radial distance at which the rotation center of the blade-shaped drill bit is separated from the center line of the boring hole. When the separation is “r”, the distance from the rotation center of the excavation bit to the tip is “(N−1)
^{2 r} ", and sweep range of the drill bit radius" N
(N-2) r "is a range of a regular N-gonal shape circumscribing the circle. According to the present invention having such a configuration, a regular N-sided boring hole is excavated based on the knowledge (B) described above.

Here, for example, as compared with a cross-sectional area such as a friction pile,
To increase the cross-sectional circumference (length of the contour of the cross-sectional shape)
In the case of the excavator of the present invention, the number of apex angles is N.
Drilling a boring hole with a regular N-gonal horizontal cross-sectional shape
Drilling rig, inside the borehole to be drilled
A boring rod coaxial with the core wire, and the boring rod
Excavation provided on and configured to rotate around
And a monitor provided on the periphery of the excavation monitor and
Inject fluid for ground excavation while rotating around the monitor
And a nozzle that rotates around the monitor
When the angular velocity to be performed is “ω”, the monitor
The angular speed of rotation around the rolling rod is “(1-N)
ω "and the monitor is the center line of the borehole.
Fluid for excavating the ground for a radial distance away from it
Of the arrival distance of "(N-1) ² Smaller than
Thus, the fluid for excavating the ground excavates
Range of the cross-sectional shape has N vertices and
To be composed of a single closed area
Just do it. Alternatively, in the excavator of the present invention,
Bolin having N regular N-sided horizontal cross-sectional shape
Drilling equipment to drill holes
Boring rod coaxial with the center line of the
N blades are arranged at equal intervals in the circumferential direction
A blade-shaped drilling bit.
The cutting bit rod is radially displaced from the boring rod.
And revolve around the surrounding area
The blade-shaped drill bit is configured as described above.
The angular velocity that rotates around the boring rod is “ω”.
When the drill bit is drilled around the boring rod,
The angular velocity revolving around the enclosure is “(1-N) ω”, and
The center of rotation of the raid drill bit is in the borehole
The drill bit for the radial distance away from the core wire
The ratio of the distance from the center of rotation to the tip is "(N-1)²
 ”Is configured to be smaller than
The cross-sectional shape of the sweep range of the cut has N vertices, and
Shape consisting of a single closed area consisting of two curves
What should be done is.

Further, according to the present invention, it is possible to drill a boring hole which is composed of N closed regions formed of a curved line and has a symmetrical cross section with respect to the center of the boring hole. That is, in the excavator of the present invention,
A boring rod coaxial with a center line of a boring hole to be excavated, a drilling monitor provided on the boring rod and configured to rotate around the boring rod, and a monitor provided on a peripheral portion of the drilling monitor and provided on the periphery thereof. A nozzle that injects a fluid for ground excavation while rotating around the monitor, and when the angular velocity at which the nozzle rotates around the monitor is “ω”, the monitor rotates around the boring rod. And the ratio of the reach of the ground excavation fluid to the radial distance apart from the center line of the boring hole by the monitor is “(N−1) ² ”. Is also reduced, so that the cross-sectional shape of the area where the fluid for excavating the ground excavates is composed of a plurality of closed areas consisting of curves and the center of the boring hole It can be constructed as to be symmetrical against. Alternatively, the drilling apparatus of the present invention has a boring rod coaxial with the center line of the boring hole to be drilled, and a blade-shaped drill bit formed by arranging N blades on the rod at equal intervals in the circumferential direction. The blade-shaped drilling bit is provided so as to be radially separated from the boring rod, and is configured to revolve while rotating around the boring rod. When the angular speed of rotation around the periphery is “ω”, the angular speed at which the excavation bit revolves around the boring rod is “(1-N) ω”, and the center of rotation of the blade-shaped excavation bit is the boring hole. ratio from the rotation center of the drill bit with respect to the radial distance away from the center line of the distance to the tip of the "(N-1) ^2" smaller than adult Thus, the cross-sectional shape of the area in which the fluid for ground excavation excavates is constituted by a plurality of closed regions formed of curves and has a shape symmetric with respect to the center of the boring hole. It can be configured as follows. Here, the “shape constituted by a plurality of closed regions formed of a curve and symmetrical with respect to the center of the boring hole” means that “the number of a plurality of closed regions” is N , FIG.
This means a double leaf shape as shown in FIG. And when the “plurality of closed areas” is (N + 1),
This means a double leaf shape as shown in FIG.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 16 show an embodiment based on the above knowledge (A). In FIG. 1, the vertices are denoted by A, B,
An embodiment in which a square boring hole H indicated by C and D is excavated by rotating a regular triangular cutter (excavation bit) T inscribed in the square. 2 to 7
A mode in which the boring hole H is formed in a square shape by the regular triangular cutter T will be described with reference to FIG.

In the figure, a regular triangular cutter T (a drill bit having a regular (N-1) square contour) is inscribed in a square boring hole H having one side 2a, and its center of gravity (centroid G) revolves counterclockwise on a trajectory R having a radius r from the center O of the boring hole H, and its rotation angle (angle of revolution) is indicated by θ. The cutter T rotates clockwise at a speed of 1/3 of the revolving speed, and its rotation angle (rotation angle) is indicated by φ. The distance L from the center of gravity G of the triangle T to the vertex P is L = 2 · 3 ^−0.5
because it is a, the center of gravity (O, G) between the distance r of the square H and triangle T ^{is, r = (2 · 3 -0} .5 -3) was a / 3,
This r is the radius of the trajectory R.

FIG. 2 shows a state where a line segment L connecting the vertex P of the triangle T and the center of gravity G overlaps the X axis, and this state is defined as a rotation angle θ = 0 °. Hereinafter, FIGS. 3 and 4 show the rotation at θ = 45 ° and 90 °, respectively, and the triangular cutter T rotates in the opposite direction φ = 15 ° and 30 °, and the locus of the vertex P is one side of the boring hole H. Is formed. Then, the vertex at θ = 135 ° in FIG. 5 is rounded,
The following sides are formed at θ = 180 ° and 270 ° in FIGS. 6 and 7. Similarly, each side is formed at another vertex (not shown) of the triangle T, and the boring hole H is formed in a square shape.

FIG. 8 shows the trajectory of the vertex P (of the triangular cutter T) when the cutter (digging bit) T as described with reference to FIGS.
Further, it is specified that the locus of the vertex P is a cross-sectional shape of the boring hole H, that is, a square. In FIG. 8, the locus of the center of gravity G of the cutter T having a regular triangular shape is represented by a symbol G.
Indicated by -T. Here, the sectional shape of the boring hole H shown in FIG. 8 is an envelope created by eccentric rotation, and each apex angle is rounded, and each side is a straight line in a strict sense. Can not say. However, the cross-sectional shape of the boring hole H shown in FIG. 8 is practically considered to be a square (regular quadrangle), and there is no problem.

FIG. 9 shows an embodiment in which a square cutter T4 forms a regular pentagonal boring hole H5, and FIG. 10 shows an embodiment in which a regular pentagonal cutter T5 forms a regular hexagonal boring hole H6. ing. In this case, the radius r of the orbit circle is the distance between the centers of gravity of the two polygons (OG), and r = a ｛s
ec (π / N) -1｝ / 2. Here, a is the distance between the center O of the N-gon and one side (see FIG. 9).

FIGS. 11 to 16 show an equilateral triangular shape (FIG. 11).
Holes H3 to H from ま で to a regular octagonal shape (FIG. 16)
8 and orbits R3 to R8 of the cutter are shown, respectively.

Next, an embodiment based on the above knowledge (B) will be described with reference to FIGS. In FIG. 17, jets J1 and J2 constituting the cross jet are represented by a single arrow J, and the nozzles N1 and N2 are also represented by points N to simplify the illustration.

Construction of improved body 10 having square cross section 1
In FIG. 17 which is a cross-sectional view schematically showing the process, if the radius of a circle formed by the locus (revolution locus) TL of the nozzle N is “r”, the initial position of the nozzle N (the position shown in FIG. 17) Is (r, 0), which can be generalized to the following equations (2) and (3). x = rcosωt (2) y = rsinωt (3) In the equations (2) and (3), the symbol ω is an angular velocity (revolution angular velocity) at which the nozzle N rotates around a monitor (not shown).
It is. At the initial position shown in FIG. 17, the jet J from the nozzle N is jetted leftward on the X-axis, and its tip is indicated by the symbol JE.

In FIG. 17, the revolution trajectory of the nozzle N is
This coincides with the locus of the center of gravity of the equilateral triangle when the equilateral triangle having the length of one side a is always inscribed in the square 10 (the square having the length of a side of a).

FIGS. 18 to 21 show the progress of cutting by the jet J, and the symbol θ indicates the angle of the nozzle N revolved. FIG. 18 shows that the nozzle N moves counterclockwise with respect to the position (initial position) shown in FIG.
ad) shows the state of revolution. Since the nozzle N rotates at an angular velocity ω of １ ／ of the revolution speed (−3ω = (1−N) ω: N = 4), the jet J jetted therefrom
Are not parallel to the X axis and have an angle (rotation angle by rotation) as shown in FIG. Then, due to the revolution and rotation of the nozzle N, the jet J also moves, and its tip JE also moves. As a result, the hatched region in FIG. 18 is cut and mixed with the ground improvement material. Here, the cross-sectional shape of the improved region is a cross-sectional shape that cannot be formed by a conventional improved body having a circular cross-section.

At this time, in the cut and improved area (the area indicated by hatching), the line connecting the point F and the point JE is a straight line parallel to the Y axis. In other words, the tip of the jet J moves upward in the figure in parallel with the Y axis. The symbol TL indicates the orbit. Also at this stage, the line segment connecting the point F and the point JE is Y
It is a straight line parallel to the axis. For simplification of illustration, in FIGS. 19 to 21, the improved regions are not hatched.

FIG. 19 shows a state in which the nozzle N has revolved around the initial position by π (rad) in the counterclockwise direction. At this stage, the tip JE of the jet J
Moves parallel to the Y axis and then to the right in the figure parallel to the X axis. At the stage shown in FIG. 20, that is, at the stage where the nozzle N has revolved by 5π / 4 with respect to the initial position, the tip JE of the jet J has further moved to the right in the figure in parallel with the X axis. . And the nozzle N is 2π
(Rad) orbital movement (in other words, orbit T
L), the tip JE of the jet J is shown in FIG.
A position as shown by 1 is reached.

Although illustration is omitted, when the nozzle N revolves around the initial position by 6π, that is, the revolving locus TL
After three rotations upward, the tip JE of the jet J returns to the initial position F (that is, performs one rotation), and a region having a square cross section, that is, a square cross section is cut. Also, in FIGS. 17 to 21, the corners of the excavated square cross section 10 are slightly rounded, but the difference between the right-angled corners and the rounded corners can be ignored in actual construction. It is a small thing.

Next, an embodiment based on the above knowledge (C) will be described with reference to FIGS. Here, in the embodiment of FIGS. 22 to 25, the cross-sectional shape (regular N-sided shape) of the boring hole is a quadrangle. That is, N =
4.

In FIGS. 22 to 25, a regular pentagonal (positive "N + 1" square) cutter P (a drill bit having a regular (N + 1) square contour) has a center of gravity (center of gravity) G which is boring. A circular orbit R having a radius r is moved (revolved) clockwise from the center O of the hole H, and the rotation angle (revolved angle) is indicated by a symbol “θ”. Here, the radius r of the locus drawn by the center of gravity of the cutter P is 1/25 (1/2) of the radius of a circle (not shown in FIGS. 22 to 25) circumscribing the cutter P.
(N + 1) ² ). In other words, the regular pentagonal cutter P has a radius of 25r (that is, “(N + 1)
Circle ^{2 r} ") (having a contour that is inscribed in FIG. 22-FIG. 25, not shown). On the other hand, the cutter P revolves while rotating, and its rotation speed is 1/5 of the above-mentioned revolution speed.
(That is, “1 / (N + 1)”), and the rotation angle (rotation angle) is indicated by a symbol “ψ”.

In considering the sweep range of the digging bit of the pentagonal cutter P shown in FIGS. 22 to 25, only the locus of the vertex PE-1 of the pentagonal cutter P will be considered below. FIG.
-In Fig. 25, the symbol "IS" is the cross-sectional shape assuming that a perfectly square boring hole can be excavated, in other words, it indicates the ideal cross-sectional shape.

FIG. 22 shows a state in which the cutter P has revolved 270 ° and rotated 54 ° with respect to the initial state. Thereby, one vertex PE-1 of the cutter P is obtained.
Draws a trajectory indicated by reference numeral “TR-21” from the origin PO.

In the state shown in FIG. 23, the cutter P revolves 630 ° and rotates 126 °. As a result, the vertex PE-1 of the cutter P draws a locus indicated by the symbol “TR-22”.

In the state shown in FIG. 24, the cutter P revolves 1260 ° and rotates 252 °. As a result, the vertex PE-1 of the cutter P draws a locus indicated by the symbol “TR-23”.

In the state shown in FIG. 25, the cutter P rotates around 1800 ° and rotates 360 °. That is, since the cutter P makes one rotation by rotation, its vertex PE
A value of -1 indicates a locus of a closed shape as indicated by reference numeral "TR-24". This locus TR-24 and the ideal sectional shape I
Comparing with S, the locus TR-24 (that is, the sectional shape of the region excavated by the cutter P) has four corners in an arc shape. However, a substantially quadrangular trajectory is drawn, and in practice, it may be considered that a boring hole having a square cross section has been excavated.

As described above, the ratio of the radial distance r at which the monitor is separated from the center line of the boring hole to the reaching distance L of the fluid for excavating the ground, or the rotation center of the blade-shaped excavating bit, If the ratio of the radial distance away from the center line of the boring hole to the distance from the rotation center of the drill bit to the tip is smaller than (N-1) ² , the sweeping of the drill bits T and P The cross-sectional shape of the range can be made to have a shape having N vertices and a side connecting the vertices formed of a curved line. FIGS. 26 to 31 show the cross-sectional shapes of the boring holes drilled according to the embodiment of FIGS. 17 to 21 when the ratio is (N-1). Here, FIG.
6 is N = 3, FIG. 27 is N = 4, FIG. 28 is N = 5, FIG.
30 shows the case where N = 6, FIG. 30 shows the case where N = 7, and FIG. 31 shows the case where N = 8.

The ratio (“the ratio of the radial distance r at which the monitor is separated from the center line of the boring hole to the reaching distance L of the fluid for excavation”, or
When "the ratio of the radial distance in which the rotation center of the blade-shaped drilling bit is separated from the center line of the boring hole and the distance from the rotation center of the drilling bit to the tip") is "N", This is shown in FIG.

As described above, the ratio of the radial distance r at which the monitor is separated from the center line of the boring hole to the reaching distance L of the ground excavating fluid, or the rotation center of the blade-shaped excavating bit, If the ratio of the radial distance apart from the center line of the boring hole to the distance from the rotation center of the drill bit to the tip is made smaller than (N-1), the sweep of the drill bits T and P can be performed. It is possible to make the cross-sectional shape of the overrange into a shape which is composed of a plurality of closed regions consisting of curved lines and which is symmetric with respect to the center of the boring hole. FIG. 32 to FIG. 37
Is N in the “plurality of closed areas”, and
When the ratio is set to “1”, FIGS.
3 shows a cross-sectional shape of a boring hole excavated according to the embodiment. Here, FIG. 32 shows N = 3, and FIG.
4, FIG. 34 shows N = 5, FIG. 35 shows N = 6, and FIG.
7 and FIG. 37 show the case where N = 8.

FIG. 45 shows "a plurality of closed areas".
Are (N + 1) and the cross-sectional shape of the boring hole when the ratio is “N−2”.

26 to 31 and FIGS. 32 to 3
Other configurations and the like in the seventh embodiment and the embodiment in FIG. 45 are substantially the same as those in the embodiments in FIGS. 17 to 21.

Next, referring to FIG. 38 to FIG. 40, a regular N-gon (for example, square: regular 4)
An embodiment in which a boring hole having a (square) cross-sectional shape is excavated will be described.

FIGS. 38 and 39 show three blades R1, R2, R3 connected at the center (particularly as shown in FIG. 38).
Or a drill bit T-1 having
Rotate and revolve as described in (1), and similarly to the cutter (regular triangular cutter: symbol “T” in FIGS. 1 to 8) used in the embodiment of FIGS. 1) describes an embodiment in which a boring hole having a shape of) is excavated.

In FIG. 38, the blade-shaped excavation bit generally denoted by T-1 has three blades R1, R2 and R3 symmetrically arranged about the rotation center VO. Each of R1, R2, and R3 is provided with a plurality of excavating chips BBC. Here, the rotation center VO of the blade-shaped excavation bit T-1 is a regular triangular center of gravity formed by connecting the vertex R1-P of the blade R1, the vertex R2-P of the blade R2, and the vertex R3-P of the blade R3. Equal to the position.

The rotation center VO is eccentric to the center O of the boring hole H excavated by the blade-shaped excavation bit T-1 by a distance "r". Boring hole H
39 coincides with the center axis of the boring rod 60 of the boring machine indicated by reference numeral 100 in FIG. In other words, the blade-shaped excavation bit T-1 revolves around the circumference whose rotation center VO is separated by a distance r from the center axis O of the boring rod 60 of the boring machine indicated by reference numeral 100 in FIG. While rotating.

In the embodiment shown in FIGS. 38 and 39, when the angular speed at which the blade-shaped excavation bit T-1 rotates is "ω", the periphery of the boring rod 60 (or the center O of the boring hole H) is formed. Blade-shaped drill bit T-
The angular velocity at which 1 revolves is “(1-N) ω”. Also,
As described above, the radial distance at which the rotation center VO of the blade-shaped excavation bit T-1 is separated from the center O of the boring hole H (or the center axis of the boring rod 60) is “r”, From the rotation center VO of the drill bit T-1 to the tip R1- of the blades R1, R2, R3.
The distance to P, R2-P, and R3-P is "(N-1) ²
r ”. As a result, the sweep range of the blade-shaped excavation bit T-1, that is, the cross-sectional shape of the boring hole H excavated by the excavation bit T-1, is a positive circle circumscribing a circle having a radius of "N (N-2) r". It has a quadrangular shape.

Other configurations and operational effects of the embodiment of FIGS. 38 and 39 are the same as those of the embodiment of FIGS.

Further, similarly to FIGS. 38 and 39, FIG.
A cutter or drill bit P-1 having a cross-sectional shape composed of five rods connected at the center as shown in FIG.
-If it rotates and revolves as described in FIG. 25, a cutter (a regular triangular cutter:
Similar to the symbol “P” in FIGS. 22 to 25, a square (square) boring hole can be excavated.

The illustrated embodiment is an exemplification, and does not limit the technical scope of the present invention. For example, in the illustrated embodiment, a case in which a boring hole having a square cross section or a pentagonal cross section is mainly excavated has been described, but a case where a hole having a desired regular N-angle cross section is excavated is described. Also, the present invention can be widely applied. Further, the present invention can be applied not only to the ground but also to a case where a boring hole is excavated in a very hard rock. It is noted that the present invention can be variously modified and changed.

[0058]

According to the present invention constructed as described above, a regular N-sided boring hole is excavated.
It can meet requests that were not possible before, and is easy to implement or construct. The present invention can be applied to not only excavation of a hole in the ground but also excavation of a bedrock or the like.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating creation of a drill hole in FIG. 1; (Θ = 0
°)

FIG. 3 is a diagram illustrating a state of rotation from FIG. 2 (θ = 45 °);

FIG. 4 is a diagram illustrating a state of rotation from FIG. 3 (θ = 90 °);

FIG. 5 is a view for explaining a state rotated from FIG. 4 (θ = 135 °);

FIG. 6 is a diagram illustrating a state of rotation from FIG. 5 (θ = 180 °);

FIG. 7 is a view for explaining a state rotated from FIG. 6 (θ = 270 °);

FIG. 8 is a diagram showing the trajectory of the drill bit in FIG. 1 to FIG. 7 by a comprehensive line.

FIG. 9 is a plan view showing another embodiment (pentagonal hole).

FIG. 10 is a plan view showing still another embodiment (hexagonal hole).

FIG. 11 is a plan view showing an example of a triangular hole according to the present invention.

FIG. 12 is a plan view showing an example of a square hole according to the present invention.

FIG. 13 is a plan view showing an example of a pentagonal hole according to the present invention.

FIG. 14 is a plan view showing an example of a hexagonal hole according to the present invention.

FIG. 15 is a plan view showing an example of a heptagonal hole according to the present invention.

FIG. 16 is a plan view showing an example of an octagonal hole according to the present invention.

FIG. 17 is a cross-sectional view schematically showing one process of cutting according to another embodiment of the present invention.

FIG. 18 is a sectional view schematically showing one process of cutting the ground according to the embodiment of FIG. 17;

FIG. 19 is a sectional view schematically showing one process of cutting the ground.

FIG. 20 is a sectional view schematically showing one process of cutting the ground.

FIG. 21 is a sectional view schematically showing one process of cutting the ground.

FIG. 22 is a sectional view schematically showing one step of ground cutting according to still another embodiment of the present invention.

FIG. 23 is a sectional view schematically showing one process of cutting the ground.

FIG. 24 is a cross-sectional view schematically showing one process of cutting the ground.

FIG. 25 is a sectional view schematically showing one process of cutting the ground.

FIG. 26 is a plan view showing an example of a triangular hole according to another embodiment of the present invention.

FIG. 27 is a plan view showing an example of a square hole according to another embodiment of the present invention.

FIG. 28 is a plan view showing an example of a pentagonal hole according to another embodiment of the present invention.

FIG. 29 is a plan view showing an example of a hexagonal hole according to another embodiment of the present invention.

FIG. 30 is a plan view showing an example of a heptagonal hole according to another embodiment of the present invention.

FIG. 31 is a plan view showing an example of an octagonal hole according to another embodiment of the present invention.

FIG. 32 is a plan view showing an example of a triangular hole according to still another embodiment of the present invention.

FIG. 33 is a plan view showing an example of a square hole according to still another embodiment of the present invention.

FIG. 34 is a plan view showing an example of a pentagonal hole according to still another embodiment of the present invention.

FIG. 35 is a plan view showing an example of a hexagonal hole according to still another embodiment of the present invention.

FIG. 36 is a plan view showing an example of a heptagonal hole according to still another embodiment of the present invention.

FIG. 37 is a plan view showing an example of an octagonal hole according to still another embodiment of the present invention.

FIG. 38 is a plan view showing a blade-shaped excavation bit used in still another embodiment of the present invention.

39 is a front sectional view showing a state in which a boring hole is excavated using the blade-shaped excavating bit shown in FIG. 38.

FIG. 40 is a view showing a modification of the blade-shaped excavation bit.

FIG. 41 shows a tunnel with a circular cross section.

FIG. 42 is a diagram showing a tunnel having a rectangular cross section.

FIG. 43 is a diagram showing a case in which conventional whole ground excavation is performed by circular excavation.

FIG. 44 is a diagram showing a case where the entire ground excavation is performed by hexagonal excavation.

FIG. 45 is a plan view showing a cross-sectional shape of a boring hole excavated according to another embodiment of the present invention.

FIG. 46 is a plan view showing a cross-sectional shape of a boring hole excavated according to another embodiment of the present invention.

[Explanation of symbols]

 H: Drilling hole O: Drilling hole center R: Track circle T, P, T-1 ... Cutter (drilling bit) G: Center of gravity of drilling means r: Track circle radius θ・ ・ (Revolution) rotation angle φ, ψ ・ ・ ・ Excavation means (rotation) rotation angle

Claims (16)

[Claims] An excavation method for excavating a boring hole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles,
The drill bit having the contour of the positive (N-1) square shape is revolved around the circumference of the radius "r" concentrically with the center of the boring hole, and is rotated at an angular velocity "ω". The angular drill bit has a contour inscribed in a circle having a radius of (N-1) ² r, and the revolving angular velocity of the regular (N-1) angular drill bit is "(1-N) ω". And the positive (N
-1) An excavation method in which a sweep range of a drill bit having a square contour is a range of a regular N square shape circumscribing a circle having a radius of "N (N-2) r". 2. An excavation method for excavating a borehole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles,
A drilling monitor provided on a boring rod coaxial with the center line of a boring hole to be drilled rotates around the boring rod, and ground excavation is performed from a nozzle provided on a peripheral portion of the drilling monitor and rotating around the monitor. When the angular velocity at which the nozzle rotates around the monitor is “ω”, the angular velocity at which the monitor rotates around the boring rod is “(1-N) ω”, When the monitor has a radial distance apart from the center line of the boring hole of “r”, the reaching distance of the fluid for ground excavation is “(N−1) ² r”, and Excavation range of fluid is radius "N (N-2)
An excavation method characterized by a range of a regular N-gon shape circumscribing the circle of “r”. 3. An excavation method for excavating a boring hole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles,
The excavation bit having the contour of the regular (N + 1) square shape is revolved around the circumference of the radius “r” concentrically with the center of the boring hole, and is rotated at an angular velocity “ω”. The bit has a contour inscribed in a circle having a radius of “(N + 1) ² r”, and the revolving angular velocity of the regular (N + 1) angular drill bit is “(N + 1) ω”, and the regular (N + 1) angular An excavation method characterized in that a sweep range of a drill bit having a contour of a shape is a range of a regular N-gonal shape circumscribing a circle having a radius of “N (N + 2) r”. 4. An excavation method for excavating a boring hole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles,
Using a blade-shaped drilling bit constituted by arranging N blades on a rod at equal intervals in the circumferential direction, the rod of the blade-shaped drilling bit is radially shifted from a boring rod coaxial with a center line of a boring hole to be drilled. The blade-shaped drilling bit is revolved around the boring rod while rotating, and when the angular velocity at which the blade-shaped drilling bit rotates around the boring rod is ω, the drilling bit is When the angular velocity of the orbit around the boring rod is “(1-N) ω”, and the radial distance at which the center of rotation of the blade-shaped drilling bit is separated from the center line of the boring hole is “r”, , the distance from the rotation center of the drill bit to the tip of the "(N-1) 2 ^r", and sweep range of the drill bit radius "N (N-2 Drilling method, characterized in that the range of positive N angle shape circumscribing a circle of r ". 5. An excavation method for excavating a boring hole having a horizontal cross-sectional shape of N regular apex angles having N apex angles,
A drilling monitor provided on a boring rod coaxial with the center line of a boring hole to be drilled rotates around the boring rod, and ground excavation is performed from a nozzle provided on a peripheral portion of the drilling monitor and rotating around the monitor. When the angular velocity at which the nozzle rotates around the monitor is “ω”, the angular velocity at which the monitor rotates around the boring rod is “(1-N) ω”, The monitor excavates the ground excavation fluid by setting the ratio of the reach of the ground excavation fluid to the radial distance apart from the center line of the boring hole smaller than “(N−1) ² ”. An excavation method characterized in that the cross-sectional shape of the range is reduced to a shape having N vertices and being constituted by a single closed region consisting of a curve. 6. An excavation method for excavating a boring hole having a horizontal cross-sectional shape of N regular apex angles having N apex angles,
Using a blade-shaped drilling bit constituted by arranging N blades on a rod at equal intervals in the circumferential direction, the rod of the blade-shaped drilling bit is radially shifted from a boring rod coaxial with a center line of a boring hole to be drilled. The blade-shaped drilling bit is revolved around the boring rod while rotating, and when the angular velocity at which the blade-shaped drilling bit rotates around the boring rod is ω, the drilling bit is The angular velocity at which the orbit revolves around the boring rod is “(1-N) ω”, and the rotation center of the blade-shaped drilling bit is shifted from the rotation center of the drilling bit with respect to a radial distance away from the center line of the boring hole. the ratio of the distance to the tip by less than "(N-1) ^2", the cross-sectional shape of the sweep range of the drill bit, the N It has a point, and, drilling method, characterized by being composed of a single enclosed area curvilinear. 7. A drilling monitor provided on a boring rod coaxial with a center line of a boring hole to be drilled rotates around the boring rod, and is provided at a peripheral portion of the drilling monitor and rotates around the monitor. When the angular velocity at which the nozzle rotates around the monitor is “ω”, the angular velocity at which the monitor rotates around the boring rod is “(1).
−N) ω ”, and the monitor sets the ratio of the reach distance of the ground excavation fluid to the radial distance apart from the center line of the boring hole smaller than“ (N−1) ² ”, An excavation method characterized in that a cross-sectional shape of an area where an excavating fluid is excavated has a cross-sectional shape including a plurality of closed regions formed of curves and is symmetrical with respect to the center of the boring hole. . 8. A blade-shaped excavating bit constituted by arranging N blades on a rod at equal intervals in a circumferential direction,
The rod of the blade-shaped drilling bit is provided radially spaced from a boring rod coaxial with the center line of a boring hole to be drilled, and revolves around the boring rod while rotating the blade-shaped drilling bit, thereby rotating the blade-shaped drilling bit. When the angular velocity at which the excavation bit rotates around the boring rod is “ω”, the angular velocity at which the excavation bit revolves around the boring rod is “(1-N)
ω ”, and the ratio of the distance from the rotation center of the drill bit to the tip to the radial distance where the rotation center of the blade-shaped drill bit is separated from the center line of the boring hole is smaller than“ (N−1) ² ”. Then, the cross-sectional shape of the range in which the fluid for ground excavation is excavated is made to be a shape composed of a plurality of closed regions formed of curves and symmetric with respect to the center of the boring hole. Excavation method characterized. 9. A drilling apparatus for drilling a borehole having a regular N-sided horizontal cross-sectional shape having a number of N apex angles,
It comprises a regular (N-1) square drill bit, which has a contour inscribed in a circle of radius (N-1) ² r, and has a radius "r" concentric with the center of the borehole. The orbit is rotated at an angular velocity “ω” while revolving on the circumference, and the orbital angular velocity is configured to be “(1-N) ω”, and the sweep range of the drill bit is a radius “N (N−N)”. 2) An excavator characterized in that the excavator is configured to be in a range of a regular N-sided shape circumscribing the circle "r". 10. A drilling apparatus for drilling a boring hole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles, wherein: a boring rod coaxial with a center line of the boring hole to be drilled; A digging monitor provided and configured to rotate around the same, and a nozzle provided at a peripheral portion of the digging monitor and injecting a ground digging fluid while rotating around the monitor. The angular velocity at which the nozzle rotates around the monitor is “ω”
Where the angular velocity at which the monitor rotates around the boring rod is "(1-N) ω" and the radial distance of the monitor away from the center line of the boring hole is "r". In addition, the reach of the ground excavation fluid is “(N−1) ² r”, and the excavation range of the ground excavation fluid is a positive circle circumscribing a circle having a radius “N (N−2) r”. An excavator, wherein the excavator is configured to have an N-corner range. 11. A drilling apparatus for drilling a boring hole having a regular N-corner horizontal cross-sectional shape having N apex angles, comprising a regular (N + 1) square drill bit, wherein the drill bit has a radius “( N + 1) ² r ”, and revolves around the circumference of radius“ r ”concentrically with the center of the boring hole and rotates at an angular velocity“ ω ”, and its revolution angular velocity is“ ( N + 1) ω ”, and the sweep range of the drill bit is configured to be a range of a regular N-gonal shape circumscribing a circle having a radius of“ N (N + 2) r ”. Drilling rig featured. 12. A drilling apparatus for drilling a boring hole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles, wherein: a boring rod coaxial with a center line of the boring hole to be drilled; And a blade-shaped drilling bit configured by arranging the blades at equal intervals in the circumferential direction, and the rod of the blade-shaped drilling bit is provided radially separated from the boring rod and has a periphery thereof. It is configured to revolve while rotating, and when the angular velocity at which the blade-shaped drilling bit rotates around the boring rod is `` ω '', the angular velocity at which the drilling bit revolves around the boring rod is: "(1-
N) ω, and when the radial distance between the rotation center of the blade-shaped drill bit and the center line of the boring hole is “r”, the distance from the rotation center of the drill bit to the tip is “( N-1) ² r ", and the sweep range of the drill bit is configured to be a range of a regular N-gonal shape circumscribing a circle having a radius of" N (N-2) r ". Drilling rig. 13. A drilling apparatus for drilling a boring hole having a horizontal cross-sectional shape of a regular N-sided polygon having N apex angles, comprising: a boring rod coaxial with a center line of the boring hole to be drilled; A digging monitor provided and configured to rotate around the same, and a nozzle provided at a peripheral portion of the digging monitor and injecting a ground digging fluid while rotating around the monitor. The angular velocity at which the nozzle rotates around the monitor is “ω”
, The angular velocity at which the monitor rotates around the boring rod is “(1-N) ω”, and the ground excavation fluid corresponds to the radial distance of the monitor from the centerline of the boring hole. Is configured to be smaller than “(N−1) ² ”, so that the cross-sectional shape of the area where the ground excavation fluid excavates has N vertices, and A drilling rig characterized in that it comprises a single closed area consisting of curves. 14. A horizontal cross section of a regular N-gonal shape having N apex angles
Drilling rig for drilling boring holes with shapes
Boring that is coaxial with the center line of the borehole to be drilled
Rod and N blades on the rod in the circumferential direction, etc.
And a blade-shaped drilling bit arranged and arranged at intervals
And the rod of the blade-shaped drilling bit is
Provided radially away from the
It is configured to revolve while rotating around the enclosure.
The drill bit turns around the boring rod
When the angular velocity to perform is “ω”, the
The angular velocity revolving around the boring rod is "(1-
N) ω ”, and the rotation center of the blade-shaped drilling bit
Is a radial distance away from the center line of the borehole
From the center of rotation of the drill bit to the tip
Is "(N-1) ² Is configured to be smaller than
Therefore, the cross-sectional shape of the sweep range of the drill bit,
A single closed region with N vertices and consisting of a curve
A drilling rig characterized by comprising a zone. 15. A boring rod coaxial with a center line of a boring hole to be drilled, a boring monitor provided on the boring rod and configured to rotate around the boring rod, and A nozzle that is provided and injects a fluid for ground excavation while rotating around the monitor. When the angular velocity at which the nozzle rotates around the monitor is “ω”, the monitor is configured to perform the boring. The angular velocity of the rotation around the rod is “(1-N) ω”, and the ratio of the reach of the ground excavation fluid to the radial distance of the monitor away from the center line of the borehole is “(N−N−ω)”. 1) is smaller than ² ), so that the cross-sectional shape of the area in which the ground excavation fluid excavates is constituted by a plurality of closed regions each formed of a curved line, and An excavator, wherein the excavator is configured to be symmetrical with respect to the center of the ring hole. 16. A boring rod having a boring rod coaxial with a center line of a boring hole to be drilled, and a blade-like drilling bit formed by arranging N blades on the rod at equal intervals in a circumferential direction, A rod of the blade-shaped drill bit is provided so as to be radially separated from the boring rod and is configured to revolve while rotating around the drill bit, and the blade-shaped drill bit rotates around the boring rod. When the angular velocity is “ω”, the angular velocity at which the excavation bit revolves around the boring rod is “(1-N) ω”, and the rotation center of the blade-shaped excavation bit moves from the center line of the boring hole. The ratio of the distance from the rotation center to the tip of the drill bit relative to the radial distance apart is configured to be smaller than “(N−1) ² ”. The cross-sectional shape of the area in which the fluid for ground excavation is excavated is constituted by a plurality of closed regions formed of curves and is configured to be symmetrical with respect to the center of the boring hole. A drilling rig characterized by the following: