JP2002276278A - Rock crushing device and center cutting method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-scale rock crushing device and a center cutting method using it capable of crushing a rock-bed by forming a crack to the rock- bed surface from the inside wall face of a drilled hole in the rock-bed wherein the drilled hole is formed from the rock-bed surface in the predetermined drilled hole formation direction. SOLUTION: When a contact part 512 in each movable piece 51 is moved toward the rock-bed surface RS in the direction making an acute angle with the pulling direction (-X), a pressure is applied to the inside wall face 11 of the drilled hole 1, and consequently, a crack CR is formed in the rock-bed R. When the movable piece 51 is moved for forming the crack, movement of each movable piece 51 is controlled by means of a second wedge member 6 and a first wedge member 3, so that no special structure for controlling the movement track of the movable piece 51 is required in the vicinity of the inside wall face 11 of the drilled hole 1, and consequently, the device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a rock mass in which a hole is formed in a predetermined drilling direction from a rock surface, by applying a crack from the inner wall surface of the hole toward the rock surface. And a centering method using the device.

[0002]

2. Description of the Related Art In order to perform rock excavation work efficiently,
It is desirable to have as many free surfaces as possible. Therefore,
Conventionally, a method has been used in which blasting is performed without centering, and the centering portion is sequentially cut and widened. In this specification, the operation of forming a centering portion on a bedrock is referred to as a "centering operation".

However, in rock excavation work near an urban area, it is basically extremely difficult to use blasting. Therefore, the present inventor has proposed a construction method capable of efficiently performing a centering work without using blasting. (Patent No. 31)
No. 17969). In this centering method, after drilling a rock with a rock drill, a crack is formed from the inner wall surface of the drilling toward the rock surface, and the rock surface portion where the crack is formed is crushed. This forms a centered portion.

[0004] The split rock apparatus used in this centering method is provided with a hollow main body whose tip side can be inserted into a drilled hole, as described in Japanese Patent Publication No. 3117969. I have. An opening is formed in a side portion of the main body, and a movable piece is disposed inside the main body corresponding to each opening. In addition, the rear end surface of each movable piece is finished in a shape capable of slidingly contacting the tapered portion of the wedge member, and the movable piece moves forward and backward with respect to the opening as the wedge member moves in the longitudinal direction of the main body. It is possible. When the wedge member is driven, the tip of the movable piece protrudes from the opening of the main body with the movement of the wedge member to apply pressure to the inner wall surface of the drilled hole, thereby forming a crack in the rock. In particular, in this device, the moving path of the movable piece is in the longitudinal direction of the main body (the moving direction of the wedge member).
At the inner surface of the borehole, forming a crack from the inner wall surface to the rock surface, breaking the rock surface.

As described above, according to the rock splitting apparatus, the moving path of the movable piece forms an acute angle with the longitudinal direction of the main body, that is, the drilling direction in a state where the tip of the movable piece faces the rock surface. Due to the configuration, the tip of the movable piece moves toward the rock surface, and a crack can be provided from the inner wall surface of the drilling hole toward the rock surface to break the rock. By forming a crack toward the rock surface in advance around the hole in this way, it is possible to easily crush the rock surface portion around the hole.

[0006]

By the way, it is necessary to form a hole when performing a centering operation. However, when performing a centering operation using the above rock splitting apparatus, a hole having a relatively large diameter is formed in advance. Need to be formed. That is, in the above rock splitting device, the main body is prepared to form the movable path of the movable piece so that the movable path of the movable piece forms an acute angle with the longitudinal direction of the main body, that is, the drilling direction. Since the movable piece, the wedge member, and the driving means (hydraulic jack) for driving the wedge member are provided inside the main body, the size of the rock breaking device can be reduced, particularly in a plane perpendicular to the direction of drilling. This is because there is a limit in reducing the size of the device.

Therefore, in order to perform a centering operation using the above-described rock splitter, it is necessary to form a relatively large-diameter hole into which the main body of the rock splitter can be inserted, and prepare a large rock drill. Needed. As a result, the above-mentioned rock splitting device and the centering step using the device can be performed only at a work site where a large rock drill can be introduced.

Therefore, without using a large rock drill,
There is a demand for a technique that can perform a centering operation only by forming a hole having a relatively small diameter, for example, a diameter of about 100 mm. What is necessary is to drill such small-diameter holes in rock using a small rock drill that can be handled by field workers. This is because the centering operation can be performed in a short time and at low cost, not only at a work site where a rock drill can be introduced but also at a work site where such a large rock drill cannot be introduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and has been developed for a rock having a hole formed in a predetermined drilling direction from a rock surface, and a crack is formed from an inner wall surface of the hole toward the rock surface. It is an object of the present invention to provide a small-sized rock splitting device capable of splitting the rock mass by giving the rock, and a centering process using the device.

[0010]

SUMMARY OF THE INVENTION The rock splitting apparatus according to the present invention is characterized in that a rock having a hole drilled from a rock surface in a predetermined drilling direction is cracked from an inner wall surface of the hole toward the rock surface. To achieve the above object, a steel rod which can be inserted into a drill hole, and a first device whose outer diameter decreases from the leading end to the trailing end of the steel rod. A first wedge member having an inclined surface, the first inclined surface being attached to the tip of the steel rod with the first inclined surface facing the opening of the drilling;
The steel rod has a second inclined surface whose outer diameter increases as it goes from the front end side to the rear end side, and is movable along the steel rod with the second inclined surface facing the first wedge member. Second
A wedge member, disposed between the first wedge member and the second wedge member within the hole, one end surface of which is slidable on the first inclined surface along the inclination direction; A part of the one end part is in contact with the inner wall surface of the hole as a contact part, and the other part of the other end part has at least one or more movable pieces that can be engaged with the second inclined surface. Movable means, comprising a driving means for driving the steel bar along the drilling direction,
When the first wedge member moves in the pulling-out direction by moving the steel rod in the pulling-out direction by the driving means, the movable piece slides along the first inclined surface, and the contact portion is moved. It moves in a direction at an acute angle to the drawing direction and toward the surface of the rock to apply pressure to the inner wall surface of the drill hole to form a crack in the rock (claim 1).

[0011] According to the invention configured as described above, one end surface of the movable piece is slidable on the first inclined surface of the first wedge member at one end of the movable piece in the drilled hole, and is movable at the other end of the movable wedge member. The contact portion at the other end contacts the inner wall surface of the hole, and the other portion is engaged with the second inclined surface of the second wedge member. Then, by moving the steel bar in the pulling-out direction by the driving means, the movable piece slides along the first inclined surface with the movement of the first wedge member in the pulling-out direction, and the contact portion is moved in the pulling-out direction. It moves in a direction at an acute angle to the rock surface and applies pressure to the inner wall surface of the borehole to form a crack in the rock. By forming a crack toward the rock surface around the hole in advance in this way, it is possible to easily crush the rock surface portion around the hole.

In the present invention, when the movable piece is moved to form a crack, the movement of the movable piece is controlled by the first wedge member and the second wedge member. It is not necessary to provide a special configuration for controlling the movement path of the movable piece (for example, in the invention of Japanese Patent No. 3117969, a hollow body is equivalent), so that the size of the apparatus can be reduced, particularly in the direction of drilling. The size of the apparatus can be reduced in a plane orthogonal to the plane.

Here, the shape of the first inclined surface can be any shape as long as it has a feature that the outer diameter decreases from the front end side to the rear end side of the steel rod. It is desirable to finish one inclined surface into a hemispherical surface (claim 2).

When the movable means is composed of a plurality of movable pieces, these movable pieces are arranged radially around a steel rod, thereby dividing the rock surface portion into a substantially conical shape centering on a drilled hole. The centering operation can be performed more efficiently (claim 3).

[0015] Further, the steel pipe is loosely fitted to the steel rod and the tip end of the steel pipe is in contact with the second wedge member. The steel pipe is mounted on the steel rod and pressed against the second wedge member. The vehicle may further include a fixing member that is engageable with the rear end portion (claim 4). In this case, the second inclined surface of the second wedge member can be securely engaged with the other end of the movable piece. In addition, when the screw is screwed on the steel rod,
The fixing member may be constituted by a nut screwed to the steel rod (claim 5).

The centering method according to the present invention is described in claim 1.
4. A core cutting method using the rock splitting device according to any one of claims 1 to 3, wherein in order to achieve the above object, a first step of forming a hole in a predetermined hole forming direction from a rock surface, and a first wedge A second step of inserting the tip of the steel rod to which the member is attached into the drilled hole, and after the second step, the first wedge member of the first wedge member is drilled in the drilled hole.
A third step of disposing the movable piece on the inclined surface, and a fourth step of moving the second wedge member along the steel bar to engage the second inclined surface with the other end of the movable piece after the third step. And, after the fourth step, the first wedge member is moved by moving the steel rod in the direction of withdrawal from the hole along the direction in which the hole is formed, so that the contact portion forms an acute angle with the direction of withdrawal of the steel rod. In the direction and toward the rock surface to apply pressure to the inner wall surface of the drilling,
A fifth step of forming a crack in the rock and a sixth step of crushing the cracked rock surface after the fifth step are provided (claim 6).

According to the invention having such a configuration, the one end surface of the movable piece can slide on the first inclined surface of the first wedge member at one end side of the movable piece in the drilled hole in the second to fourth steps. On the other end side, the contact portion at the other end contacts the inner wall surface of the hole, and the other portion is engaged with the second inclined surface of the second wedge member. Then, in the fifth step, when the steel bar moves in the drawing direction along the hole forming direction, the movable piece slides along the first inclined surface as the first wedge member moves in the drawing direction. The contact portion moves in a direction that forms an acute angle with the direction in which the steel rod is pulled out, and moves toward the rock surface to apply pressure to the inner wall surface of the drill hole, thereby forming a crack in the rock. By forming a crack toward the rock surface around the hole in advance in this way, it is possible to easily crush the rock surface portion around the hole.

Moreover, since the rock splitting apparatus is small as described above, a crack can be formed around the drilled hole toward the rock surface even if the drilled hole has a relatively small diameter. Increases versatility.

Here, after the fourth step and before the fifth step, the steel pipe is loosely fitted to the steel rod, and the tip of the steel pipe is connected to the second pipe.
After making contact with the wedge member, the movable piece is moved toward the inner wall surface of the drill hole along the second inclined surface by pressing the steel pipe toward the second wedge member, and the abutting portion is formed inside the drill hole. The fixing member may be fixed to the steel bar in a state in which the fixing member is in close contact with the wall surface.

Further, in the fifth step, at the same time as the steel rod is moved in the direction of pulling out of the hole, the fixing member is moved toward the second wedge member and the steel pipe is pressed against the second wedge member. Good (claim 8).

[0021]

FIG. 1 is a diagram showing one embodiment of a rock splitting apparatus according to the present invention. FIG. 2 is an exploded perspective view showing a partial configuration of the rock splitting apparatus of FIG. This rock splitting device is a device that splits a rock R by giving a crack CR from the inner wall surface 11 of the drilled hole 1 formed downward (+ X) from the rock surface RS to the inside of the rock, toward the rock surface RS. . Thus, in this embodiment, the downward direction (+ X) is the drilling direction.

This rock splitting apparatus has an outer diameter smaller than the inner diameter of the borehole 1, and has a steel rod 2 on which an external thread is threaded. Examples of the steel rod 2 include a general PC steel rod, a “total screw PC steel rod / Gevin Destab” / “small diameter deformed PC steel rod / Sumitwist” manufactured by Sumitomo Electric Industries, and a Kobe Steel “ High-strength deformed steel bars / screw-containers ”can be used.

A first wedge member 3 made of a steel ball having an outer diameter slightly smaller than the inner diameter of the hole 1 is provided at the tip of the steel rod 2.
Is attached. More specifically, a through hole is formed in the first wedge member 3, and the tip of the steel rod 2 is inserted into the through hole. A nut 41 is screwed into the foremost portion of the steel bar 2, supports the first wedge member 3 via a washer 42, and prevents the first wedge member 3 from dropping from the tip of the steel bar 2. Attached. Of course, a female screw is screwed into the through hole of the first wedge member 3 and screwed into the steel rod 2,
The first wedge member 3 may be fixed to the steel rod 2 by welding or the like.

The outer half of the surface of the first wedge member 3 facing the opening of the drill hole 1 has an outer diameter that decreases in the direction (−X) from the front end to the rear end of the steel rod 2. (Corresponding to the “first inclined surface” of the present invention) 31. A movable unit 5 including three movable pieces 51, 51, 51 radially arranged around the steel bar 2 is provided on the hemisphere 31. In addition, each movable piece 51
The one end face 511 is finished to have the same curvature as the curvature of the upper hemisphere 31, and can slide on the upper hemisphere 31 along the inclined surface. On the other hand, on the other end side of each movable piece 51, a part of the other end portion is in contact with the inner wall surface 11 of the drill hole 1 as a contact portion 512, and another portion of the other end portion is in contact with the notch portion 513. And can be engaged with a second wedge member described below.

A second wedge member 6 finished in a truncated cone shape is loosely fitted to the steel rod 2. This second wedge member 6
Has a tapered surface (corresponding to the “second inclined surface” of the present invention) 61 whose outer diameter increases as it advances in the direction (−X) from the front end side to the rear end side of the steel rod 2. The tapered surface 61 is movable along the steel rod 2 with the tapered surface 61 facing the first wedge member 3. In this embodiment, since the direction in which the hole is formed is downward (+ X), the hole moves toward the first wedge member 3 by its own weight, and the tapered surface 61 moves the movable piece 5.
The downward movement is restricted by engaging with the one notch portion 513. Therefore, as described later, each movable piece 51
Moves to the inner wall surface 11 side of the drilled hole 1 and the notched portions 61 are separated from each other, the tapered surface 61 engages with the notched portion 513 of each movable piece 51 in conjunction with the separating operation by its own weight. While the second wedge member 6 moves downward. That is, the movable piece 51 slides on the upper hemisphere 31 of the first wedge member 3 while being pressed by the second wedge member 6. In this embodiment, since the sliding surface on which the movable piece 51 slides is a spherical surface, these cutout portions 513 are spread in a trumpet shape as if the petals bloom as the steel rod 2 is pulled up. Therefore, it is desirable to design the tapered surface 61 in consideration of this operation.

Following the second wedge member 6, the steel rod 2 has a steel pipe 7
Is loosely fitted, and the distal end of the steel pipe 7 is
(-X) side end surface. A nut 8 is screwed to the steel rod 2 so as to be located near the rear end of the steel pipe 7. For this reason, when the nut 8 is fed in the (+ X) direction, the nut 8 engages with the rear end of the steel pipe 7 while pressing the steel pipe 7 toward the second wedge member 6.

Further, in this embodiment, a drive unit 9 for driving the steel bar 2 in the drilling direction X is provided. As shown in FIG. 1, the drive unit 9 includes a hydraulic hollow jack (for example, OJ Power Jack EC100H1 manufactured by Osaka Jack Co., Ltd.).
5) 91 and a support mechanism 92 for supporting the hollow jack 91. In this support mechanism 92, the horizontal support member 921 is supported in a state substantially parallel to the rock surface RS by a plurality of hydraulic jacks 922, and by adjusting the amount of expansion and contraction of the piston of each hydraulic jack 922, the height of the rock surface RS is adjusted. The horizontal posture of the horizontal support member 921 can be easily ensured regardless of the unevenness.

The hollow jack 91 is attached to the horizontal support member 921. This hollow jack 9
Numeral 1 is externally inserted into the rear end of the steel rod 2, and a nut 93 is screwed from the rear end of the steel rod 2 to tighten the upper surface of the movable portion 911 of the hollow jack 91. Therefore, the hollow jack 91 is driven to pull out the steel rod 2 from the drilled hole 1 (−X).
To the first rod attached to the tip of the steel rod 2.
The wedge member 3 moves integrally in the pulling-out direction (-X) to
A crack CR is formed from the inner wall surface 11 toward the rock surface RS.

Next, the operation of the above-structured rock splitter and the procedure for centering using the rock splitter will be described with reference to the drawings.

First, a rock surface RS using a rock drill
A hole is formed in a downward direction (+ X) toward the inside of the rock. Then, as shown in FIG. 2, after inserting the steel rod 2 to which the first wedge member 3 is attached into the drilled hole 1,
The three movable pieces 51 are arranged radially around the steel bar 2 on the upper hemisphere 31 of the. Then, the second wedge member 6 is moved downward (+ X) along the steel bar 2 to engage the tapered surface 61 with the cutout portion 513 of each movable piece 51. by this,
The posture of each movable piece 51 is controlled by the second wedge member 6 and the first wedge member 3 in the hole 1 in a state where the contact portion 512 of each movable piece 51 is in contact with the inner wall surface 11 of the hole 1. I have. Then, as shown in FIG. 3, the steel rod 2 is lowered in the downward direction (+ X) in this posture state, and the contact part 512 is moved to a desired depth position. That is, the contact part 512 is positioned at the expected starting position of the crack.

Subsequently, as shown in FIG.
After the steel pipe 7 is loosely fitted with the steel pipe 7 and the tip of the steel pipe 7 is brought into contact with the upper end face of the second wedge member 6, the nut 8 is fed in the (+ X) direction so that the second wedge member 6 is formed by the steel pipe 7. (+
In the direction X), each movable piece 51 is moved along the tapered surface 61 toward the inner wall surface 11 of the hole 1. As a result, the contact portion 512 comes into close contact with the inner wall surface 11 of the hole 1, and the nut 8 is screwed and fixed to the steel rod 2, so that each part of the apparatus is cut without supporting the steel rod 2 from outside. It can be set for the hole 1.

Next, as shown in FIG. 5, after assembling the support mechanism 92 on the rock surface RS, the hollow jack 91 is attached to the horizontal support member 921 of the support mechanism 92. At this time, the hollow jack 91 is externally inserted into the rear end of the steel rod 2, and a nut 93 is screwed into the hollow jack 9 from the rear end of the steel rod 2.
The upper surface of the movable portion 911 is tightened.

When the preparation for the rock splitting operation is completed in this way, as shown in FIG. 1, the hollow jack 91 is driven to move the steel rod 2 in the pulling-out direction (-X). Pulling out the first wedge member 3 attached to the
Move to X). Then, each movable piece 51 slides on the upper hemispherical surface 31 of the first wedge member 3 in the inclined direction while moving in the pulling-out direction (−X) with the movement of the first wedge member 3. The contact portion 512 of the hole 51 moves in a direction forming an acute angle θ, for example, 30 °, with the drawing direction (−X) of the steel bar 2 and toward the rock surface RS to apply pressure to the inner wall surface 11 of the drill hole 1. Crack CR to break the rock R. In particular, in this embodiment, the three movable pieces 51 are radially arranged around the steel bar 2, and the movable pieces 51 protrude radially and the cracks CR are also radially formed. An inverted and substantially conical portion r with the drilled hole 1 as the center is raised from the bedrock R. That is, the cracks CR are connected to each other to form a free surface. In addition, for convenience of the following description, the portion r is referred to as a “surface separation portion”.

By forming a free surface on the rock surface as described above, the drilling 1 can be expanded as described below. Of course, it is not essential to form a completely free surface in performing the centering operation, and only a crack CR is generated from the inner wall surface 11 of the drilled hole 1 toward the rock surface RS at the rock surface. However, the drilling 1 can be expanded by performing the operation described below.

Next, as shown in FIG. 6, the nut 8 is fed downward (+ X) by an amount corresponding to the movement of the second wedge member 6 and the steel pipe 7 in the downward direction (+ X) with respect to the nut 8. . As a result, the nut 8 comes into contact with the rear end of the steel pipe 7, and the steel pipe 7 returns to the state where the second wedge member 6 is pressed again in the (+ X) direction, thereby preventing the steel rod 2 and the first wedge member 3 from descending. can do. Then, following this, the nut 93 and the hollow jack 91 are removed from the steel rod 2, and the support mechanism 92 is also withdrawn. Thus, the surface separation portion r
After the surface is exposed, the surface separation portion r is crushed and removed by a conventionally known rock splitter as described in, for example, JP-A-8-105288. In this way, as shown in FIG. 7, the surface separation part r is completely removed, the centering part is expanded, and the free surface is expanded. Of course, the centering operation may be completed with this. However, in this embodiment, after the surface side of the centering portion is further widened by a well-known splitting device, the above-described centering operation is repeated to remove the centering portion. To expand. By doing so, a larger centering portion can be formed.

As described above, according to this embodiment, the contact portion 512 of each movable piece 51 is cut by moving the contact portion 512 at an acute angle to the drawing direction (-X) and toward the rock surface RS. A pressure is applied to the inner wall surface 11 of the hole 1 to generate a crack CR.
Is formed on the bedrock R. By forming the crack CR toward the rock surface RS around the drill hole 1 in advance in this way, it is possible to easily crush the rock surface portion around the drill hole 1. In particular, as in this embodiment, a free surface is formed by a rock splitting operation, and a surface separation portion r
By crushing so that the surface rises, the crushing of the surface separation portion r can be performed easily and efficiently, and the work time for centering can be significantly reduced, and the noise can be reduced.

Moreover, in this embodiment, when moving the movable piece 51 to form a crack, each movable piece 5
Since the movement of the movable piece 51 is controlled by the second wedge member 6 and the first wedge member 3, a special configuration for controlling the movement path of the movable piece 51 in the vicinity of the inner wall surface 11 of the hole 1 (for example, see Patent 311
In the invention of No. 7969, there is no need to provide a hollow main body), so that the size of the device can be reduced, particularly, the size of the device in a plane orthogonal to the drilling direction X can be reduced. As a result, even if the borehole 1 has a relatively small diameter, a crack CR toward the rock surface RS can be formed around the borehole 1 and the versatility of the centering operation can be improved.

The present invention is not limited to the above-described embodiment, and various changes other than those described above can be made without departing from the gist of the present invention. For example, in the above embodiment, the three movable pieces 51 are radially arranged around the steel bar 2, but the number and arrangement of the movable pieces 51 are not limited to this, and are arbitrary. In particular, in the above embodiment, the movable piece 51 is
, The drilling 1 is expanded concentrically by executing the above-mentioned centering work. For example, as shown in FIG. The drilling device 1 can be selectively expanded in the arrangement direction Y of the movable pieces 51 by performing a centering operation in the same manner as in the above-described embodiment using the rock splitters opposed to each other.

In the above embodiment, the first wedge member 3 is formed of a steel ball. However, the first wedge member 3 is formed of, for example, a hemispherical body, and the spherical surface is defined as the “first inclined surface” of the present invention. May be attached to the tip of the steel rod 2 in a state of facing. It is not an essential component of the present invention that the first inclined surface is a spherical surface. The outer surface of the steel rod 2 has an outer diameter that decreases as it goes in the direction (−X) from the front end to the rear end. For example, the first wedge member 3 may be constituted by a conical or frustoconical metal member.

In the above embodiment, the contact portion 512 of the movable piece 51 is moved in a direction at an angle of 30 ° with the drawing direction (-X) of the steel rod 2, but the angle θ is not limited to this. However, for example, by changing the angle θ, the direction in which the crack is formed can be changed.
By doing so, the diameter of the large-diameter portion formed by the centering operation can be changed.

In the above embodiment, the steel rod 2 is moved in the direction X.
Hydraulic hollow jack 9 as a drive source for
However, it is needless to say that other drive sources and drive mechanisms may be used.

In the above embodiment, the steel rod 2 is moved in the pulling direction (-X) to form a crack CR in the rock R, and then the nut 8 is fed downward (+ X) and the nut 8 is moved to the rear of the steel pipe 7. The second wedge member 6 is pressed again in the (+ X) direction by the steel pipe 7 while being in contact with the end portion. The mechanism for pressing the second wedge member 6 in the (+ X) direction in this way, that is, the steel pipe 7 and the nut 8 Is not an essential component for forming the crack CR in the bedrock R, but an optional component. However, by providing the steel pipe 7 and the nut 8 as described above, the respective portions of the apparatus are drilled without supporting the steel rod 2 from the outside in a state where the contact portion 512 is positioned at the expected starting position of the crack.
Can be set with respect to, and workability can be improved.

Further, the nut 8 is fed in and the second
For the step of pressing the wedge member 6 in the (+ X) direction,
The nut 8 may be fed downward (+ X) at the same time as the steel rod 2 is moved in the pulling direction (−X), and the second wedge member 6 may be constantly pressed in the (+ X) direction by the steel pipe 7. By doing so, the tapered surface 61 of the second wedge member 6 can be reliably engaged with the cutout portion 513 of the movable piece 51. Further, when the drilling direction X is formed in a direction other than downward, unlike the above embodiment, it is difficult to move the second wedge member 6 toward the first wedge member 3 by its own weight. By simultaneously performing the movement of the steel bar 2 in the direction (−X) and the feeding of the nut 8 in the drilling direction (+ X), the same operation and effect as in the above embodiment can be obtained. That is, according to the present invention, the drilling direction X
Is not limited to the downward direction, and a crack is given from the inner wall surface 11 of the drilling 1 toward the rock surface RS to the rock R in which the drilling 1 is formed in the arbitrary drilling direction X from the rock surface RS. The bedrock R can be split.

[0044]

As described above, according to the present invention, one end surface of the movable piece is slidable on the first inclined surface of the first wedge member at one end side of the movable piece in the hole, and the other end is provided. On the side, while the contact portion at the other end contacts the inner wall surface of the drill hole, and the other portion is engaged with the second inclined surface of the second wedge member, the steel rod is moved in the pulling direction. As a result, as the first wedge member moves in the pulling-out direction, the movable piece
Sliding along the inclined surface, the contact part moves in the direction that forms an acute angle with the drawing direction, and moves toward the rock surface to apply pressure to the inner wall surface of the drill hole and form a crack in the rock surface are doing. As described above, according to the present invention, when the movable piece is moved to form a crack, the movement of the movable piece is controlled by the second movement.
Since the control is performed by the wedge member and the first wedge member, a special configuration for controlling the movement path of the movable piece near the inner wall surface of the hole (for example, in the invention of Japanese Patent No. 3117969, the hollow main body is used) Need not be provided), the device size in a plane perpendicular to the drilling direction can be reduced, and the rock splitting device can be downsized.

Further, by performing the centering process using such a small rock splitter, it is possible to form a crack toward the rock surface around a drilled hole even if the hole is relatively small in diameter. it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a rock splitting apparatus according to the present invention.

FIG. 2 is an exploded perspective view showing a partial configuration of the rock splitter of FIG.

FIG. 3 is a diagram for explaining the operation of the rock splitting device of FIG. 1 and a centering operation using the device.

FIG. 4 is a diagram for explaining the operation of the rock splitting device of FIG. 1 and a centering operation using the device.

FIG. 5 is a view for explaining the operation of the split rock apparatus of FIG. 1 and a centering operation using the apparatus.

FIG. 6 is a diagram for explaining the operation of the rock splitting device of FIG. 1 and a centering operation using the device.

FIG. 7 is a view for explaining the operation of the rock splitting device shown in FIG. 1 and a centering operation using the device.

FIG. 8 is a view showing another embodiment of the rock splitting apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drilled hole 2 ... Steel rod 3 ... 1st wedge member 5 ... Movable unit (movable means) 6 ... 2nd wedge member 7 ... Steel pipe 8 ... Nut (fixed member) 9 ... Drive unit (drive means) 11 ... Inner wall surface 31 of the hole 31 Upper semispherical surface (first inclined surface) 51 Movable piece 61 Tapered surface (second inclined surface) 511 One end face (of the movable piece) 512 ... Contact portion 513 (of the movable piece) … Notch part (other part) CR… Crack R… Rock rock… RS rock surface X… Drilling direction −X… Pull-out direction (of steel bar)

Claims (8)

[Claims] Claims: 1. A rock cutting device for cracking a rock formed by drilling from a rock surface in a predetermined drilling direction in a predetermined drilling direction from an inner wall surface of the drill toward the rock surface and breaking the rock. A steel rod that can be inserted into the hole, and a first inclined surface having an outer diameter that decreases from a front end side to a rear end side of the steel rod, and the first inclined surface is formed by the hole. A first wedge member attached to the distal end of the steel bar in a state facing the opening of the steel bar, and a second inclined surface whose outer diameter increases from the distal end side to the rear end side of the steel rod, A second wedge member movable along the steel bar with the second inclined surface facing the first wedge member; and the first wedge member and the second wedge member within the borehole. One end surface of which is slidable on the first inclined surface along the inclination direction. At least a movable piece in which a part of the other end is in contact with the inner wall surface of the hole as a contact part, and another part of the other end is engageable with the second inclined surface. A driving means for driving the steel bar along the drilling direction, wherein the driving means moves the steel rod in a direction to pull out the drilling hole from the drilling hole. As the one wedge member moves in the pulling-out direction, the movable piece slides along the first inclined surface, and the abutting portion is in a direction making an acute angle with the pulling-out direction, and on the rock surface. A rock cracking device, wherein the crack is formed in the bedrock by moving toward the inner surface of the borehole to apply pressure. 2. The rock splitting device according to claim 1, wherein the first inclined surface is a hemispherical surface. 3. The rock splitting apparatus according to claim 1, wherein the movable means is composed of a plurality of movable pieces, and these movable pieces are radially arranged around the steel bar. 4. A steel pipe which is loosely fitted to the steel rod and whose tip end abuts on the second wedge member, and which is mounted on the steel rod and presses the steel pipe against the second wedge member. The rock splitting device according to any one of claims 1 to 3, further comprising: a fixing member that can be engaged with a rear end of the steel pipe in a folded state. 5. The rock splitting device according to claim 4, wherein a screw is screwed into the steel rod, and the fixing member is formed of a nut screwed to the steel rod. 6. A core cutting method using the rock splitting device according to claim 1, wherein a first hole is formed from a rock surface in a predetermined hole forming direction.
A second step of inserting a tip end of the steel rod, to which the first wedge member is attached, into the hole, and a first step of the first wedge member in the hole after the second step.
A third step of disposing the movable piece on the inclined surface; and after the third step, moving the second wedge member along the steel bar to move the second inclined surface to the other end of the movable piece. A fourth step of engaging, and after the fourth step, the first wedge member is moved by moving the steel rod in a direction of pulling out of the hole along the hole forming direction, thereby moving the first wedge member. Applying pressure to the inner wall surface of the drilled hole by moving the contact portion in a direction at an acute angle with the drawing direction of the steel bar and toward the rock surface,
A centering method, comprising: a fifth step of forming a crack in the rock, and a sixth step of crushing the rock surface portion where the crack has been formed after the fifth step. 7. The split rock device is loosely fitted to the steel rod, a tip of which is in contact with the second wedge member, and a steel pipe mounted on the steel rod to attach the steel pipe to the second wedge. A fixing member that can be engaged with a rear end of the steel pipe in a state where the steel rod is pressed toward the member, and after the fourth step and before the fifth step, After loosely fitting the steel pipe against the steel pipe and bringing the tip of the steel pipe into contact with the second wedge member, the movable piece is pressed against the second inclined surface by pressing the steel pipe against the second wedge member. 7. The centering method according to claim 6, wherein the fixing member is fixed to the steel bar in a state in which the contact portion is moved closely along the inner wall surface of the drill hole so that the abutting portion is in close contact with the inner wall surface of the drill hole. . 8. In the fifth step, the steel rod is moved in the pulling-out direction, and at the same time, the fixing member is moved toward the second wedge member to move the steel pipe toward the second wedge member. The centering method according to claim 7, wherein the pressing is performed.