JPH06229186A - Rock crusher and rock crushing method using the same crusher - Google Patents

Abstract

PURPOSE:To take both rock crushing force and a rock crushing stroke largely by transmitting pushing force in the direction that the diameter of a pushing member is expanded over a pushing-force transmission body by a driving mechanism under the state, in which the driving mechanism is inserted into a guide hole drilled to a bedrock. CONSTITUTION:Pushing force in the direction that the diameters of pushing members 20, 20 are expanded is transmitted over pushing-force transmission bodies 30, 30 by a drive mechanism 40 under the state, in which the driving mechanism is inserted into a guide hole G1 drilled to a bedrock G to be crushed. Consequently, the pushing-force transmission bodies 30 are moved, and pushing force in the direction that the guide hole G1 is pushed open is transmitted from the pushing members 20. When a center spacer 50 is interposed between the pushing-force transmission body 30 and the pushing member 20, pushing force generated by the driving mechanism 40 is transmitted over the pushing member 20 through the center spacer 50 from the pushing-force transmission body 30. The center spacer 50 is formed in a tapered shape at that time, thus smoothly inserting the center spacer 50 up to the interior of the crack of the crushed bedrock. The center spacer 50 and side spacers 51, 51 are adjusted in response to the change of the opening of the crack, and approximately constant spreading and size can be held in the driving mechanism 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rock breaking device for breaking rocks and the like without making a blast using a hole or the like, and a rock breaking method using the same.

[0002]

2. Description of the Related Art In civil engineering works such as tunnels in urban areas, it is often impossible to perform blasting work that causes pollution such as noise and vibration caused by construction work. I have to. Conventionally, as a non-blasting method, a rock breaking method has been adopted in which a rock is drilled in a bedrock or the like and a rock breaking device is inserted to break the rock. A conventional rock breaking device has a pressing member arranged in a guide hole formed in a bedrock and spaced apart in two opposite directions of the hole, and a pair of the pressing members is pushed in a direction away from each other by using hydraulic pressure or the like. It is configured to split rocks by unfolding.

By the way, there are two performances that are important in this rock breaking device: "breaking rock force" and "breaking rock stroke".
The above two performances have a relationship that when the energy applied to the split rock device is constant, the value obtained by multiplying the split rock force and the split rock stroke is constant (there is a slight error due to energy loss such as friction). It holds. Therefore, if the breaking rock force is increased, the breaking rock stroke is shortened, and the breaking rock force for lengthening the breaking rock stroke is reduced. Generally, the conventional rock breaking device requires a large breaking rock force because the rock mass that is the object of breaking the breaking rock device has considerable strength, so the breaking rock stroke should be reduced to increase the breaking rock force. ing.

[0004]

However, in the case of the above split rock device, the following problems have occurred. In other words, in the above-mentioned rock breaking device, 1) the width of the cracking rock is small and the range of cracks is small, 2) it is necessary to construct a large number of guide holes for inserting the breaking rock, for the above reasons, 3) Since the cracks that enter the rock in one direction in the direction of the rock are short, it is necessary to repeat a large number of cracks. 4) It is difficult to separate the rock fragments from the rock. Due to the fact that the work to break the bedrock with breakers etc. was required, the split rock was a very inefficient work.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a split rock device and a split rock method capable of increasing split rock force and split rock stroke and improving the work efficiency of split rock. It is what

[0006]

According to another aspect of the present invention, there is provided a plurality of pressing members which extend in one direction by a certain size and are arranged annularly in cross section, and a hollow portion surrounded by these pressing members. A plurality of pressing force transmitters arranged and movable in a direction of expanding the plurality of pressing members in a sectional view; a drive mechanism for pressing the pressing members in a direction of expanding the pressing member; A center spacer is provided between the member and the pressing force transmitter, which is insertable and detachable and has a taper such that the inner side is thin and the inlet side is thick.

According to a second aspect of the present invention, in the first aspect of the present invention, when the plurality of pressing members are expanded in diameter, they can be inserted and removed between the pressing members, and the inlet is thin on the back side. It is characterized by including side spacers that are tapered so that the side becomes thicker.

The split rock method according to claim 3 is the method according to claim
Or a method of dividing rock using the dividing rock device according to 2, wherein a first step of forming a guide hole by drilling a bedrock, inserting the dividing rock device into the guide hole, and operating the drive mechanism. The second step of expanding and crushing the pressing member by the pressing force transmitter,
After the second step, the pressing force transmitting body is moved in the direction of the original position so that the center is tapered between the pressing force transmitting body and the pressing member so that the back side is thin and the inlet side is thick. A third step of inserting a spacer, operating the drive mechanism again, and expanding the diameter of the pressing member by the pressing force transmitting body to split the rock.

The split rock method according to claim 4 is the method according to claim 3
The split rock method described above is characterized in that the tapered side spacers are inserted between the pressing members when the pressing members are expanded in diameter so that the inner side is thin and the inlet side is thick.

[0010]

According to the split rock device of the first and second aspects, the pushing force in the direction in which the driving mechanism expands the pushing member to the pushing force transmitting body in the state of being inserted into the guide hole drilled in the rock to be broken. By applying the pressing force, the pressing force transmitting body moves to transmit the pressing force from the pressing member in the direction of expanding the guide hole. If the pressing force transmitter is moved in the direction of the original position, the pressing member can be reduced in diameter. If a center spacer is provided between the pressing force transmitting member and the pressing member, the pressing force generated by the drive mechanism is transmitted from the pressing force transmitting member to the pressing member via the center spacer. Also, when the center spacer and side spacers are inserted, the cracks of the split rock are small open on the back side and wide open on the inlet side.
Since the center spacer and the side spacers are tapered so that the inner side is thin and the inlet side is thick, the center spacer and the side spacers are smoothly inserted to the inner side. Since the change in the crack opening can be adjusted by the center spacer and the side spacers, the drive mechanism can maintain a substantially constant spread size.

According to the split rock method of claims 3 and 4,
By interposing the center spacer between the pressing force transmitting member and the pressing member, the separation distance between the pressing member and the drive mechanism is expanded, and the movement range of the pressing member due to the expansion and contraction of the drive mechanism is adjusted by the thickness of the center spacer. Displace only outward. The pressing force applied from the pressing member to the guide hole is hardly attenuated. At this time, the crack of the split rock opens wide on the entrance side and opens small on the back side, but the center spacer and the side spacers are thick on the entrance side and thin on the back side. Further, by interposing the side spacers between the pressing members, it is possible to prevent the pressing members from being reduced in diameter when the pressing force transmitting body is moved in the original position direction, and to facilitate the interposing work of the center spacer.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. Reference numeral 10 in the drawing is a split rock device of the present embodiment. As shown in FIGS. 1 and 2, the rock breaking device 10 has a substantially circular cross-section and is inserted into a guide hole G1 formed in the rock G to be broken into a guide hole G1 in the rock G. It has a sufficient length to give the split rock force in the direction of expanding the diameter. Further, as shown in FIG. 1, the split rock device 10 includes two pressing members 20 that extend in one direction by a certain dimension and are annularly arranged in a sectional view, and a hollow portion 11 surrounded by these pressing members 20. The two pressing members 20 arranged
A plurality of pressing force transmitting bodies 30 that are movable in the direction of expanding the diameter of the pressing member 20, a driving mechanism 40 that presses the pressing member 20 in the direction of expanding the pressing member 20, and the pressing member 20 and the pressing member 20. A center spacer 50 that can be inserted into and removed from the pressure transmitting body 30 and a side spacer 51 that can be inserted into and removed from the pressing members 20 when the plurality of pressing members 20 are expanded in diameter. ing.

The pressing member 20 is an arcuate disc-shaped member that is rigidly formed of steel in a form in which the outer peripheral portion of the rock breaking device 10 is divided into two, and extends over the entire length of the rock breaking device 10. Have a length. Two pressing members 20 are arranged so as to face each other so as to have a substantially annular shape in cross section. The opposing circumferential end faces 21 of the pair of pressing members 20 are formed into flat surfaces obtained by cutting a circular arc in cross section in the radial direction. The side spacer 51 is interposed between the end surfaces 21 and 21 facing each other.

As shown in FIG. 3, the inner peripheral surface 22 of each pressing member 20 has a space between the pressing members 20, 20,
It is formed on a smooth circumferential surface centered on the center of the split rock device 10. Further, a shield plate 23 is attached between the facing end faces 21 and 21 to cover the opening 12 formed between the end faces 21 and 21 from the outside when they are separated from each other.

The shield plate 23 has a pressing member 2 facing each other in cross section.
A plate having the width of the side spacer 51 in the facing direction of 0 and extending over the entire length of the split rock device 10, and one side in the width direction (length direction in cross section) forms a pair. Is fixed to one of the pressing members 20 by welding or the like, and the other side in the width direction is slidably abutted on the outer surface of the pressing member 20 located on the side facing the fixed side. The shield plate 23 is provided with the pressing members 20, 20 facing each other.
Since the opening 12 formed by the pair of end faces 21 facing each other being separated from each other is covered from the outside, the inside of the rock breaking device 10 for the fragments of the rock G and the earth and sand when the pressing member 20 is expanded in diameter. To prevent contamination. The shield plate 2
The fixing of 3 to the pressing member 20 may be a screw or the like other than welding.

As shown in FIG. 1, the pressing force transmitting body 30 is
It is a columnar member that extends in the entire length direction of the split rock device 10 having a generally crescent-shaped cross section, and has an outer surface formed in a curved surface that matches the inner peripheral surface 22. The pressing force transmission body 30 is made of steel and is rigid. Pressing force transmitter 30
An inclined surface 31 is formed on the inner side surface of the pressing force transmitting body 30 so as to be deeply cut from both end portions in the length direction toward the central portion. Then, two pressing force transmitting bodies 30 are arranged in the hollow portion 11 between the two pressing members 20 to form a one-to-one combination with the pressing members 20. In the pair of pressing force transmitters 30 and 30 facing each other, each pressing force transmitter 30
The sloping surfaces 31 of the slabs are positioned at the same position in the radial direction of the split rock device 10, and as a result, the split rock device 10 is in a state where the split rock device 10 is arranged so as to face toward the center and spread toward the center.

As shown in FIG. 1, the drive mechanism 40 includes a rubber tube 41 arranged in the center of the split rock device 10 in a sectional view.
And a wedge 42 disposed on the side of the rubber tube 41 in the shielding plate 23, 23 direction. The rubber tube 41 is a flexible flexible bag that extends over the entire length of the split rock device 10, is connected to a hydraulic pump, and expands and contracts by the hydraulic pressure supplied by the hydraulic pump. There is.

The wedge 42 is a split rock device 10 having a substantially trapezoidal sectional view.
Is a columnar member that is rigidly formed of steel and extends in the entire length direction of, and is interposed in the gap between the pressing force transmission bodies 30 and 30 facing each other. The two hypotenuses of each wedge 42 are
Each of them is slidably in contact with the inclined surface 31 of the pressing force transmitting body 30 adjacent thereto.

In the drive mechanism 40, when the rubber tube 41 expands, the wedge 42 is pushed out in the direction away from the central portion of the split rock device 10, and the pair of inclined surfaces 31 and 31 is placed between the inclined surface 31. The rubber tube 41 moves while sliding, and expands and contracts, so that the rubber tube 41 can move toward the central portion of the split rock device 10.

As shown in FIGS. 1, 9 and 10, the center spacer 50 is a columnar member extending in the entire length direction of the split rock device 10 having a crescent-shaped cross section, and as shown in FIG. Further, a taper is formed in the split rock direction so that the inlet side of the guide hole G1 is thicker and the inner side is thinner, and the taper is inserted in the gap formed between the pressing member 20 and the pressing force transmitting body 30. When the center spacer 50 is inserted into the rock breaking device 10, the center spacer 50 has such a length as to project outward from the end portion on the inlet side of the rock breaking device 10, and projects outward. On the end surface of the center spacer 50,
A handle 50a is provided for inserting and removing the center spacer 50 from the split rock device 10. As shown in FIGS. 1, 11 and 12, the side spacer 51 is a rectangular member in cross section, and is tapered in the split rock direction so that the inlet side of the guide hole G1 is thicker and the inner side thereof is thinner as shown in FIG. It is formed and is interposed in the opening 12 formed between the pair of pressing members 20, 20 facing each other. Side spacer 5
When the 1 is attached to the split rock device 10, the side spacer 51 has such a length that it projects outward from the end of the split rock device 10 on the inlet side. A handle 51a for inserting / removing the side spacer 51 into / from the split rock device 10 is provided on the end surface of the. The center spacer 50 and the side spacers 51 are
Like the pressing member 20 and the pressing force transmitting body 30, it is rigidly made of steel. Further, the center spacer 50 and the side spacer 51 are detachable from the split rock device 10, respectively.

The operation of the split rock device 10 will be described below. In the split rock device 10, as the wedge 42 moves in the longitudinal direction in cross section with respect to the inclined surface 31 due to the expansion and contraction of the rubber tube 41, the pressing force transmitters 30 are brought closer to each other.
Separate. That is, when the rubber tube 41 is expanded, the wedge 42 is pushed out and moves in the direction of the opening 12 between the two pressing force transmitters 30.
The separation distance of the pair is expanded by the wedge 42 and the expansion force of the rubber tube 41. On the contrary, if the rubber tube 41 is contracted, a force in the direction of decreasing the separation distance acts between the pressing members 20 facing each other by the pressing force from the bedrock G to be broken during the rock breaking operation. Therefore, the wedge 42 moves toward the central portion of the split rock device 10, and the distance between the pair of the inclined surfaces 31 facing each other decreases, so that the pressing force transmitters 30 and 3 are transmitted.
Distance between 0 approaches.

When the pressing force transmitters 30 are separated from each other, the pressing force of the drive mechanism 40 faces the pressing force transmitter 30 directly to the pressing member 20 or via the center spacer 50. Since the distance between the pressing members 20, 20 increases, the pressing member 20 is expanded in diameter. Pressing member 2
When 0 is expanded, the pressing force acts in a direction in which the pressing member 20 expands the guide hole G1 formed in the rock G.

Hereinafter, a method of breaking rock bed G using the rock breaking device 10 will be described. In the split rock method, a first step of forming a guide hole G1 by drilling a rock G and the guide hole G
1. The second step of inserting the split rock device 10 into the inside 1 and operating the drive mechanism 40 to expand the diameter of the pressing member 20 by the pressing force transmitting body 30 to split the rock, and after the second step, transmitting the pressing force. By moving the body 30 in the direction of the original position, the pressing force transmitting body 30
And the pressing member 20, the center spacer 50 is inserted, the driving mechanism 40 is operated again, and the pressing member 20 is expanded in diameter by the pressing force transmitting body 30 and the third step is performed.

In the first step, as shown in FIG. 4, the rock mass G is drilled by using a rock drilling machine or the like.
A substantially horizontal guide hole G1 is formed in the.

In the second step, as shown in FIGS. 2 and 3, after inserting the rock breaking device 10 into the bedrock G, as shown in FIGS. 5 and 13, the drive mechanism 40 is hydraulically expanded. As a result, the diameter of the pressing member 20 is expanded and the guide hole G
By exerting a pressing force in the direction of expanding the diameter to 1, the bedrock G is primarily split. The separation distance between the pressing members 20 facing each other during the primary splitting is set to be smaller than the length of the shielding plate 23 projecting from the pressing member 20 to which the shielding plate 23 is fixed to the facing pressing member 20. At this time, as shown in FIG. 13, since the strength of the bedrock G near the entrance of the guide hole G1 is smaller than the strength of the bedrock G at the back side, the width of the crack C formed by the split rock is near the entrance. The side is larger than the back side. Therefore, the gap between the pressing members 20 is formed obliquely.

In the third step, as shown in FIG. 6, first, with the pressing member 20 in the expanded state, the side spacers are formed on both of the two facing end surfaces 21 and 21. Interpose 51. At this time, as shown in FIG. 14, the side spacer 51 is tapered so that the back side is thin and the entrance side is thick.
And the shape of the space formed by the end surface 21 of the pressing member 20 described above are substantially matched. of course,
Since the above-mentioned shape changes depending on the type of bedrock G, several kinds of side spacers 51 having different tapers are prepared in advance, and one having a shape substantially matching the shape of the space formed by the end surface 21 of the pressing member 20 is used. Side spacer 51
7 is completed, the pressing force transmitting body 30 is reduced in diameter, and the pressing force transmitting body 30 and the drive mechanism 40 are moved to one side to drive the pressing force transmitting body 30 and the driving force transmitting body 30, as shown in FIG. The inner peripheral surface 2 of the pressing member 20 is provided on the opposite side of the mechanism 40.
2 and the outer surface of the pressing force transmitting body 30 form a separated space, and the center spacer 50 is interposed in this space to form a gap.
To the state of. At this time, the side spacers 51 are tapered so that the inlet side is thicker and the inner side is thinner, and the gap for inserting the center spacer 50 is also tapered so that the inlet side is thicker and the inner side is thinner, as shown in FIG. In addition, the center spacer 50 can be interposed in this gap. At this time, several kinds of center spacers 50 having different tapers are prepared similarly to the side spacers 51, and the center spacer 50 having a taper matching the above gap is used. When the center spacer 50 is completely inserted, as shown in FIG. 8, the pressing force transmitting body 30 is re-expanded to carry out secondary blast rock.

In the third step, a side spacer 51 is additionally interposed, and a center spacer 5 having a different shape from the above.
It is possible to repeat by exchanging with 0 or additionally interposing.

According to the above split rock device 10, the drive mechanism 4
Since the pressing force generated by 0 is transmitted from the pressing force transmission member 30 to the pressing member 20 via the center spacer 50, even if the distance between the pressing member 20 and the drive mechanism 40 is large, the pressing member 20 is not pressed. A large split rock force can be applied from 20 toward the hole surface of the guide hole G1. As a result, the rock breaking device 10 can improve the work efficiency of the rock breaking corresponding to the guide hole G1 having a large diameter.

Further, according to the above split rock device 10, since both the center spacer 50 and the side spacer 51 are tapered in the split rock direction so that the inner side is thin and the inner side is thick, for example, the center spacer 50 and the side spacers are formed. It is possible to prevent the pressing member 20 from being deformed by the concentrated load of the split rock applied to the position where the center spacer 50 and the side spacer 51 stop without the 51 completely entering the split rock device 10. Further, since the center spacer 50 and the side spacers 51 do not go all the way into the split rock device 10, the pressing member 20 is prevented from opening too much near the entrance, and the drive mechanism 40 inside them is prevented from being damaged. And the rubber tube 41, for example
It is possible to suppress the bursting of members such as.

According to the above-mentioned split rock method, the center spacer 50 is interposed between the pressing force transmitting member 30 and the pressing member 20, so that the moving range of the pressing member 20 due to the expansion and contraction of the drive mechanism 40 can be adjusted. Since the cracks are easily expanded by displacing the cracks by the thickness, the number of guide holes G1 to be formed and the number of cracks in the traveling direction of the rock are reduced with respect to the bedrock G to be broken. The split rock fragments can be easily separated from the bedrock G, and the split rock crack C can be continuously expanded, so that the work efficiency of the split rock is significantly improved. The moving range of the pressing member 20 can be easily displaced by selecting the shape of the center spacer 50. At this time, the center spacer 5
Since 0 is thin on the back side and thick on the inlet side, the center spacer 50 is smoothly inserted,
Work efficiency is further improved.

Further, according to the split rock method, the side spacer 51 is interposed between the adjacent pressing members 20, 20 so that the pressing member 20 is moved when the pressing force transmitting body 30 is moved toward the original position. Since the diameter reduction is prevented and the work of inserting the center spacer 50 is facilitated, the work efficiency of the split rock is further improved. Further, at this time, since the side spacers 51 are thinly tapered on the back side and thick on the inlet side, the side spacers 51 are smoothly inserted and work efficiency is further improved.

The pressing member 20 and the pressing force transmitting member 3
0 may be a form in which the number of divisions is further increased, other than the two-divided sectional view split rock device 10.

[0033]

According to the split rock device of the present invention, the pressing force generated by the driving mechanism is transmitted from the pressing force transmitting member to the pressing member through the center spacer, so that the distance from the driving mechanism is increased. Even if it is large, it is possible to exert a large split rock force from the pressing member toward the hole surface of the guide hole, and it is possible to improve the work efficiency of the split rock corresponding to the guide hole having a large diameter. Also, at this time, the center spacer is tapered so that the back side is thin and the entrance side is thick, so that the center spacer can be inserted smoothly. For example, the center spacer does not completely go into the back and the position where the center spacer stops. It is possible to suppress the deformation of the pressing member due to the concentrated load of the split rock. In addition, since the center spacer does not go all the way in, it is possible to prevent the pressing member from opening too much near the entrance and damaging the drive mechanism inside them.

According to the split rock device of the second aspect, in addition to the above effects, the side spacers are interposed between the pressing members.
The diameter of the pressing member is prevented from being reduced, and the load on the drive mechanism when the center spacer is interposed can be reduced.
Further, since the side spacer is tapered so that the back side is thin and the entrance side is thick, the side spacer can be smoothly inserted.

According to the split rock method of the third aspect, the center spacer is interposed between the pressing force transmitting member and the pressing member so that the moving range of the pressing member due to the expansion and contraction of the drive mechanism is equal to the thickness of the center spacer. Since it displaces outwards only and facilitates the expansion of cracks, it reduces the number of guide holes to be formed and the number of cracks in the direction of progress of the rocks, as well as reducing the number of cracks in the rock fragments. The separation from the bedrock can be facilitated and the diameter of the guide hole can be expanded continuously, greatly improving the work efficiency of the split rock. Further, since the center spacer is tapered so that the inner side is thinner and the inner side is thicker, the center spacer is smoothly inserted and the working efficiency is further improved.

According to the split rock method of claim 4,
By interposing the side spacers between the pressing members, the diameter reduction of the pressing members is prevented when the pressing force transmitting body is moved in the direction of the original position, and the interposing work of the center spacer is facilitated. Work efficiency is further improved. Further, since the side spacers are tapered so that the inner side is thinner and the inner side is thicker, the side spacers are smoothly inserted into the split rock device and the work efficiency is further improved.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a split rock device of the present invention.

FIG. 2 is a side view showing a state in which the split rock device of FIG. 1 is inserted into a drilled hole formed in rock to be split.

FIG. 3 is a front cross-sectional view showing a most reduced diameter state of the split rock device of FIG.

[Fig. 4] Fig. 4 is a construction procedure diagram showing a process of boring a rock to be split rock.

FIG. 5 is a construction procedure diagram showing a primary split rock.

FIG. 6 is a construction procedure diagram showing insertion of a side spacer.

FIG. 7 is a construction procedure diagram showing a step of reducing the diameter of the split rock device after the primary split rock.

FIG. 8 is a construction procedure diagram showing a secondary split rock.

FIG. 9 is a schematic diagram showing an inserted state of a center spacer.

10 is a cross-sectional view taken along the line AA in FIG.

FIG. 11 is a schematic view showing an inserted state of side spacers.

12 is a cross-sectional view taken along the line BB in FIG.

FIG. 13 is a cross-sectional view showing an opened state of the rock breaking machine itself at the end of the primary rock breaking.

FIG. 14 is a cross-sectional view showing an inserted state of the side spacer after the primary split rock is completed.

[Explanation of symbols]

 10 Split Rock Device 11 Hollow Part 20 Pressing Member 30 Pressing Force Transmitter 40 Drive Mechanism 50 Center Spacer 51 Side Spacer G Rock Mass G1 Guide Hole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Fumio Takizawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Kazuhiro Fukuda 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hiroshi Kazama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Terushige Fujita 2-1-11-1 Shibadaimon, Minato-ku, Tokyo Fujiville Japan Mine Machine Co., Ltd. (72) Inventor Fukuju Sakaguchi 2-11-1, Shiba Daimon, Minato-ku, Tokyo Fuji Building Nippon Mining Machinery Co., Ltd. (72) Inventor Tadao Ishii 2-11-1, Shiba Daimon, Minato-ku, Tokyo Fuji Bill Japan Mining Machinery Co., Ltd. (72) Inventor Yasue Tanabe 2-11-1, Shiba Daimon, Shiba, Minato-ku, Tokyo Fuji Building Japan Mining Machinery Co., Ltd. (72) Inventor Masayoshi Ishii Shiba, Minato-ku, Tokyo Mon-chome 11th No. 1 Fuji buildings Japan mineral machine within Co., Ltd.

Claims (4)

[Claims] 1. A plurality of pressing members that extend in one direction by a certain dimension and are arranged in an annular shape in a sectional view, and a plurality of pressing members that are arranged in a hollow portion surrounded by these pressing members and are expanded in a sectional view. A plurality of pressing force transmitters that are movable in the moving direction, a driving mechanism that pushes the pressing force transmitters in the direction to expand the pressing member, and an insertion / removal between the pressing member and the pressing force transmitters. A split rock device characterized by comprising a center spacer which is free and has a taper so that the back side is thin and the entrance side is thick. 2. The split rock device according to claim 1, wherein
A split rock device comprising a side spacer that is insertable and removable between the pressing members when the diameters of the plurality of pressing members are expanded, and that is formed with a taper so that the inner side is thin and the inlet side is thick. 3. A split rock method using the split rock device according to claim 1 or 2, wherein a first step of drilling a rock bed to form a guide hole and inserting the split rock device into the guide hole. Then, the second step of activating the drive mechanism to expand the pressing member by the pressing force transmitting body to split the rock, and after the second step, move the pressing force transmitting body in the direction of the original position. Insert the tapered center spacer between the pressing force transmitter and the pressing member so that the inner side is thicker and the inner side is thicker, and operate the drive mechanism again to expand the pressing member by the pressing force transmitter. And a third step of breaking the rock. 4. The split rock method according to claim 3,
A split rock method characterized in that when the pressing members are expanded in diameter, the tapered side spacers are inserted between the pressing members so that the inner side is thin and the inlet side is thick.