JP2008018694A - Cutter device and electrical discharge crushing method using the cutter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein it has been necessary to form many holes in an object to be broken conventionally and the work of forming the many holes has been troublesome. <P>SOLUTION: The electrical discharge crushing method of the present invention comprises two cutters 52 each having a cutting blade at the circumferential edge of a circular plate 52b. The two cutters are provided at a predetermined interval so that the surface of the circular plate is opposed in parallel with each other. A cutter device 50 in which a rotary central axis 54 passing the centers of the circles of the two circular plates in a straight line state is rotatably provided as a center, is used. The two cutters of the cutter device are rotated to cut the surface of the object to be broken. Thus, grooves of a groove width longer than the length of summing the thicknesses y of the two circular plates are formed. The discharge part of an electrode unit and a pressure transmission medium which surrounds the discharge part are provided in the grooves. A voltage is applied to the electrode of the discharge part in the state that the discharge part and the opening of the provided groove of the pressure transmission medium are blocked by a coating material, and discharged, thereby breaking the object to be broken. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cutter device for forming a groove in an object to be crushed by an electric discharge crushing method, and an electric discharge crushing method using a groove formed in the object to be crushed by the cutter device.

An electric discharge crushing method using an electric discharge crushing device for crushing a crushing object such as a rock, bedrock, concrete structure or the like is known (see Patent Documents 1 and 2).
As shown in FIG. 7, the electric discharge crushing device 50 </ b> A includes a pulse power source 80, a power supply unit 81 such as a generator, and an electrode device 70.
The pulse power source 80 is formed by a circuit including a large-capacitance capacitor 82 and switches 83 and 84. Although not shown, the circuit of the pulse power source 80 is grounded.
The power supply unit 81 is connected to one pole 82 b of the capacitor 82 and is connected to the other pole 82 a of the capacitor 82 via a switch 83.
The electrode device 70 includes an insulator that insulates the one electrode connected to one electrode 82b of the capacitor 82, the other electrode connected to the other electrode 82a of the capacitor 82 via the switch 84, and the one electrode from the other electrode. And formed. For example, a rod-like inner conductor 73 as one electrode such as a + electrode, a cylindrical insulator 74 covering the outer periphery of the inner conductor 73, and a-electrode provided around the outer periphery of the insulator 74 It comprises an external conductor 75 as the other electrode. That is, the electrode device 70 is a coaxial electrode device having a configuration in which the inner conductor 73, the insulator 74, and the outer conductor 75 are coaxially arranged. The inner conductor 73 and the outer conductor 75 are connected to the pulse power source 80 by the connector 72 and the connection cable 71.
The outer conductor 75 constitutes a plurality of floating electrodes 76 provided at intervals in a direction along the center line of the inner conductor 73. The floating electrode 76 is an electrode that is electrically insulated from the power supply side.
A tip-side discharge gap between the tip electrode 73t formed by the tip of the internal conductor 73 protruding and exposed from the tip 74t of the insulator 74 and the tip-side floating electrode 76t that is the floating electrode 76 closest to the tip electrode 73t. 77 is formed, and an intermediate discharge gap 78 is formed between the end 76s and the end 76s of the floating electrodes 76 facing each other. A plurality of intermediate discharge gaps 78 are formed.
A discharge portion is formed by the tip electrode 73t and the tip side floating electrode 76t arranged with the tip side discharge gap 77 therebetween. A discharge portion is formed by the floating electrode 76 and the floating electrode 76 arranged with the intermediate discharge gap 78 therebetween. That is, the electrode device includes a plurality of discharge units.
A discharge crushing method using the discharge crushing apparatus 50A having the above configuration will be described. A hole 61 is formed in the object 60 to be crushed, and an electrolytic solution 63 such as water is injected into the hole 61 with the switch 84 and the switch 83 being in a non-conductive state, and the discharge part of the electrode device 70 is inserted into the electrolytic solution 63. To do. The switch 83 is turned on to cause the capacitor 82 to accumulate charges from the power supply unit 81. Then, the object to be crushed 60 is crushed by causing the switch 84 to conduct and applying a voltage to the electrode of the discharge part of the electrode device 70 to discharge it.
JP 2003-31175 A JP 2003-320268 A

  In the method of forming the hole 61 in the crushing object 60 and installing the discharge part of the electrode device 70 in the hole 61 to discharge the crushing object 60 as in the prior art disclosed in Patent Documents 1 and 2; It is necessary to form a large number of holes 61, and there is a problem that the work of forming the large number of holes 61 is troublesome.

The cutter device according to the present invention includes two cutters each provided with a cutting blade on the circumference of a circular plate, and the two cutters are provided at a predetermined interval so that the surfaces of the circular plates face each other in parallel. It is characterized in that it is provided so as to be rotatable about a rotation center axis passing through the center of a circle of two circular plates in a straight line.
The electric discharge crushing method by this invention uses the said cutter apparatus, rotates two cutters of this cutter apparatus, and cuts the surface of a crushing target object, On the surface of a crushing target object, two circular plates of A groove having a groove width equal to or greater than the combined thickness is formed, and a discharge portion of the electrode device and a pressure transmission medium surrounding the discharge portion are provided in the groove, and the discharge portion and the groove where the pressure transmission medium is installed The object to be crushed is crushed by applying a voltage to the electrode of the discharge part and discharging it in a state where the opening is closed with a covering material.

  According to the present invention, it is possible to form a groove on the surface of the object to be crushed and to simplify the operation compared to the case of forming a large number of holes on the surface of the object to be crushed, and to provide a cutter device having two cutters. By using it, it is possible to form a groove having a longer groove width in the object to be crushed than a cutter apparatus having only one cutter, so that a conductor wire having a large wire diameter as an electrode device having a discharge portion installed in the groove It is possible to use an electrode device formed of an electric wire having a high voltage, accurately transmit a high voltage from the power supply device to the discharge unit, and efficiently crush the object to be crushed.

  1 to 4 show the best mode of the present invention, FIG. 1 shows a cutter device, FIG. 2 shows a discharge crushing device and a crushing object, FIG. 3 shows the steps of a discharge crushing method, and FIG. The state of the concrete plate after electric discharge crushing is shown.

The configuration of the cutter device will be described with reference to FIG.
The cutter device 50 transmits a base 51, two cutters 52, a rotation drive source 53 that rotates the two cutters 52, and rotational power generated by the rotation drive source 53 to the rotation center shaft 54 of the cutter 52. A power transmission mechanism 55, a depth adjustment device 56 for adjusting the cutting depth by the cutter 52, an operation handle 57, and wheels 58 are provided. Wheels 58 are provided on the left and right sides of the base 51. The rotational drive source 53 is formed by an engine or a motor. The rotational drive source 53 is covered with the case 53a, and the power transmission mechanism 55 is covered with the case 55a. Cases 53a and 55a and operation handle 57 are connected to base 51 via stays 53b, 55b and 57b, respectively. One end of the rotation center shaft 54 is connected to an output shaft (not shown) of the power transmission mechanism 55, and the other end of the rotation center shaft 54 is rotatably attached to a bearing portion 51 a provided on the base 51.

  The cutter 52 is provided with a cutting blade 52b on the circumference of a circular plate 52a formed of metal. The two cutters 52 are provided at a predetermined interval x so that the circular surfaces 52c of the circular plates 52a face each other in parallel, and the rotation centers pass through the centers of the circles of the circular plates 52a of the cutters 52 in a straight line. The shaft 54 is provided to be rotatable about the rotation center. The coupling hole 52d formed at the center of the circle of the circular plate 52a and the rotation center shaft 54 are coupled to each other so that the individual circular plates 52a of the two cutters 52 rotate together with the rotation center shaft 54. As a result, the rotation center shaft 54 is connected. The upper side of the two cutters 52 is covered with a protective cover 52k connected to the case 53a.

  The depth adjusting device 56 is formed by a restriction plate 56A and a restriction plate fixing portion 56B. The regulation plate 56A comes into contact with the surface 5 of the concrete plate 4 as the object to be crushed and determines the cutting depth by the cutter. The restriction plate fixing portion 56B is fastened to the side wall 56a provided on both sides of the restriction plate 56A, the vertically long slot 56b formed in the side wall 56a, the bolt 56c fixed to the base 51, and the bolt 56c. It is formed with a nut 56d. After the position of the restriction plate 56A is determined by moving the position of the restriction plate 56A in the vertical direction with respect to the bolt 56c through the elongated hole 56b, the nut 56d is fastened to the bolt 56c and the side wall 56a is the front end surface of the base 51. By being pressed against 51f, the restricting plate 56A is fixed so as not to move. In addition, it is also possible to cut diagonal grooves in the two cutters 52 on the surface 5 of the concrete plate 4 by setting the regulation plate 56A to be diagonal.

By rotating the two cutters 52 of the cutter device 51 to cut the surface 5 of the concrete plate 4, the predetermined distance x and the plate thickness y of the two circular plates 52a are applied to the surface 5 of the concrete plate 4. A groove 7 (see FIG. 2) having a groove width of about the added length can be formed.
For example, when the plate thickness y of the circular plate 52a is 5 mm and the predetermined interval x is 10 mm, the two cutters 52 form grooves 7a each having a groove width of about plate thickness y on the surface 5 of the concrete plate 4. . When the concrete portion 7b remaining between the groove 7a and the groove 7a is hit with a hammer or the like, the portion 7c connecting the bottom of the groove 7a and the groove 7a is peeled off and the concrete portion 7b is removed, thereby forming the groove 7. Is done.

With reference to FIG. 2, the discharge crushing apparatus and the crushing object will be described.
The electric discharge crusher 1 includes a power supply device 2 and an electrode device 3.
The flat concrete plate 4 as the object to be crushed has, for example, a vertical length a of 500 mm, a horizontal length b of 400 mm, and a thickness d of 140 mm. Of the rectangular surfaces 5 as the two front and back surfaces of 500 mm in length and 400 mm in width, one of the surfaces 5 facing upward is a groove having a groove width e of 20 mm and a depth f of about 50 mm by a cutter device 50. 7 is formed. The groove 7 has a shape that continuously extends from one edge 8 that faces each other to the other edge 9 on one surface 5, and the upper part 10 and both edges 11; 11 open.
The groove defined in the present invention refers to a groove formed with a length in the extending direction of the groove, that is, a groove length a (here, the same as the vertical length a) longer than the width e.
The flat plate shape defined in the present invention refers to a flat plate shape in which the thickness d described above is shorter than the vertical length a and the horizontal length b. The thickness d may be uniform or not uniform.

The power supply device 2 includes a pulse power source 16, a booster 17, and an electrode connector 18.
The pulse power source 16 is formed by a circuit 19 including a capacitor 20 and switches 21 and 22. Although not shown, the circuit 19 of the pulse power source 16 is grounded.
Booster 17 is connected to one pole 23 of capacitor 20 and to the other pole 24 of capacitor 20 via switch 21. The capacity of the capacitor 20 is, for example, 200 μF (microfarad).
The electrode connecting portion 18 is provided in the housing 25 of the pulse power source 16. One electrode connection portion 18 a is connected to one pole 23 of the capacitor 20. The other electrode connection portion 18 b is connected to the other pole 24 of the capacitor 20 via the switch 22.
In the best mode, the switch 22 and the switch 21 are both in a non-conductive state, for example, AC 200 V power is supplied to the booster 17 via a power cord (not shown), and the AC 200 V is changed to 22 kV by the booster 17. Boosted. When the switch 21 is turned on, charge is accumulated in the capacitor 20. When the switch 22 is turned on after the electric charge is accumulated in the capacitor 20, a discharge is generated between the electrodes 35; 36 of the discharge unit 30 of the electrode device 3.

The discharge electrode device 3 includes an electric wire 37, a discharge unit 30, a gap maintaining material 31 such as a fastening band, and a connector 40. The electric wire 37 is formed of a so-called covered wire having a wire diameter of about 4 mm to 5 mm in which a conductor wire such as a copper wire having a wire diameter of about 2 mm to 3 mm is covered with a resin such as vinyl resin.
The discharge part 30 is in a state in which the pair of electrodes 35; 36 disposed so as to face each other with a predetermined gap g serving as a discharge gap and the pair of electrodes 35; 36 face each other with a predetermined gap g. It forms with the space | interval maintenance material 31 to maintain. The pair of electrodes 35; 36 is formed by the ends of the electric wires 37.
The electrode device 3 includes one or more discharge units 30. When the plurality of discharge portions 30 are formed in series, the electric wire 37A that forms one end electrode 35A in the series is connected to the connector 40A provided at the end opposite to the electrode 35A. The electric wire 37B which forms the other end electrode 36B in series and is connected to the one electrode connecting portion 18a of the power supply device 2 via the connector is provided at the end opposite to the electrode 35B. It is connected to the other electrode connection part 18b of the power supply device 2 through 40B. Although not shown, in the case where there is one discharge unit 30, one of the power supply devices 2 is connected to an electric wire forming one electrode of the discharge unit 30 via a connector provided at an end opposite to the electrode. The other electrode connecting portion of the power supply device 2 is connected to the electrode connecting portion 18a of the power supply device 2 via a connector provided at the end opposite to the electrode. 18b.

  As a method for forming the discharge unit 30, for example, one end side of the electric wire 37 is folded back to the other end side of the electric wire 37 with the intermediate portion of the single electric wire 37 provided with the connectors 40 at both ends as a boundary. 1, the one end side of the electric wire 37 and the other end side of the electric wire 37 are bound and bundled by the spacing maintaining material 31 at a plurality of locations. Locations to be bound by the spacing material 31 are adjusted to positions where the electrodes 35 and 36 are formed. In other words, the gap maintaining material 31 binds two places separated by a gap slightly wider than the predetermined gap g serving as a discharge gap. And the discharge part 30 is formed by cutting either one of the one end side or the other end side of the electric wire 37 between the pair of spacing members 31; 31 tied to the two places to form a discharge gap. It can be formed (see an enlarged view of part A in FIG. 2). One or more such discharge portions 30 may be formed.

The electric discharge crushing method will be described with reference to FIG. In FIG. 3A, the discharge portion 30 of the electrode device 3 and the non-compressed body 42 as a pressure transmission medium surrounding the discharge portion 30 are provided in the groove 7, and the openings of both edges 11; Sectional drawing which cut | disconnected the part of the groove | channel in the state obstruct | occluded by the filling obstruction | occlusion materials 41, such as along the extending direction of a groove | channel, FIG.3 (b) is the surface 5 of the concrete plate 4 of the state of Fig.3 (a). Sectional drawing which cut | disconnected the state which covered the covering material on along the direction orthogonal to the extension direction of the groove | channel 7, FIG.3 (c) is a figure which shows the concrete plate 4 by which electric discharge crushing was carried out. First, a starter switch (not shown) of the cutter device is turned on to drive the engine, thereby rotating the cutter 52 to form the groove 7 on one surface 5 of the concrete plate 4. As shown in FIG. 3A, the concrete plate 4 is installed on the installation unit 99 with the surface 6 facing the installation unit 99 such as the ground so that the surface 5 on which the groove 7 is formed faces up. The discharge part 30 of the electrode device 3 is installed in the groove 7 formed on the surface 5, and the openings of both edges 11; 11 of the groove 7 are closed with a filling plug 41 such as a putty. The non-compressed body 42 as a pressure transmission medium is filled in the groove 7 closed by the both edges 11; 11, and the discharge part 30 is surrounded by the uncompressed body 42. That is, the periphery of the discharge unit 30 installed in the groove 7 is filled with the non-compressed body 42. After filling the non-compressed body 42 in the groove 7, the discharge part 30 may be buried in the non-compressed body 42. As the non-compressed body 42, an electrolytic solution such as water or an aqueous solution is used. Then, as shown in FIG. 3B, the power supply device 2 is started after placing the weight 43 as the covering material on the one surface 5 facing upward to close the opening of the upper portion 10 of the groove 7. The switch 22 of the power supply device 2 is turned off for a predetermined time, and the switch 21 is turned on to accumulate the electric charge in the capacitor 20. When the switch 22 is turned on after the predetermined time has elapsed, a voltage is applied to the electrodes 35; 36 of the discharge unit 30 of the electrode device 3, and discharge occurs in the discharge unit 30. The non-compressed body pressed by the energy generated by the discharge presses the inner surface (the groove wall 45 and the groove bottom 46) of the groove 7 to crush the concrete plate 4, or a part of the non-compressed body 42 is generated by the energy generated by the discharge. The concrete plate 4 is crushed by expanding the volume by vaporizing and pressing the inner surface of the groove 7. That is, the concrete plate 4 is crushed by the pressure generated by the energy generated during discharge.
If the weight 43 is of a weight that does not lift even when subjected to the pressure generated by the energy generated during discharge, the pressure generated by the energy generated during discharge does not leak out of the groove 7. Since it is added to the inner surface of the groove 7, it is more effective.
That is, the groove 7 is formed on one surface 5 of the concrete plate 4, and the discharge portion 30 of the electrode device 3 and the non-compressed body 42 surrounding the discharge portion 30 are provided in the groove 7. In order not to leak outside, the opening of both edges 11; 11 of the groove 7 where the discharge part 30 and the non-compressed body 42 are installed is closed by the filling plug 41 and the opening of the upper part 10 of the groove 7 is used as a covering material. In a state of being covered with the weight 43, the concrete release plate 4 is crushed by applying a voltage to the electrodes 35;

  According to the best mode 1, the openings of both edges 11; 11 of the groove 7 where the discharge part 30 is installed are closed by the filling plug 41 such as putty, and the opening of the upper part 10 of the groove 7 is closed by the weight 43. Accordingly, the discharge is performed after the pressure generated by the energy generated during the discharge is made difficult to leak out of the groove 7, so that the pressure generated by the energy generated during the discharge is applied to the inner surface of the groove 7. Come to join. The pressure applied to the inner surface is transmitted to the concrete as a force that moves the concrete of the concrete plate 4 to the side surface 4s that is a free surface, and thus cracks (cracks) D are generated in the concrete and the concrete plate 4 is crushed. Further, as shown in FIGS. 2 and 3, since the groove 7 includes a corner portion 47 that is a boundary between the groove wall 45 and the groove bottom 46, the corner portion 47 becomes a starting point of the crack D, and the crack D is formed in the concrete. Since it becomes easy to occur, the concrete plate 4 can be effectively crushed.

  Further, the flat concrete plate 4 having a thickness d shorter than the vertical length a and the horizontal length b is used as the object to be crushed. 37 can be crushed by the discharge in the discharge unit 30 of the electrode device 3, the capacity of the capacitor 20 of the power supply device 2 can be reduced, and the cost of the power supply device 2 can be reduced.

In the best mode 1, the cutter device 50 has a groove width of about a length obtained by adding a predetermined interval x which is an opposing interval between the circular surfaces 52c of the two cutters 52 and a plate thickness y of the two circular plates 52a. The groove 7 can be formed. That is, since the groove 7 having a long groove width can be formed on one surface 5 of the concrete plate 4 as compared with a cutter device having only one cutter, the electrode device 3 having the discharge portion 30 installed in the groove 7. As a result, it becomes possible to use the electric wire 37 having a conductor wire with a thick wire diameter, and to accurately transmit the high voltage from the power supply device 2 to the discharge unit 30 and to efficiently crush the concrete plate 4.
On the other hand, when a groove is formed on one surface 5 of the concrete plate 4 using a cutter device having only one cutter, the groove width of the groove is shortened. For this reason, it becomes impossible to use an electric wire having a diameter larger than the groove width, and it is easy to cause disconnection in the electric wire portion other than the discharge portion of the electrode device. Therefore, if the wire is disconnected, the high voltage from the power supply device 2 cannot be transmitted to the discharge portion. The concrete plate 4 cannot be efficiently crushed.

  When the concrete plate 4 is to be finely crushed by the conventional electric discharge crushing method shown in FIG. 7, FIG. 5 ((a) is a plan view, and FIG. 5 (b) is an AA cross-sectional view of FIG. ) After forming a large number of holes 61 extending in the direction from the one surface 5 to the other surface 6 in the concrete plate 4, water and the discharge part of the electrode device 70 are put in the appropriate holes 61. The concrete plate 4 is crushed by discharging, or the holes 61 are formed one by one from the side close to the edge of the one surface 5, and the discharge is performed in the hole 61 to cause the edges of the concrete plate 4. It is necessary to crush in order from the department side. That is, it is necessary to form a large number of holes 61 on one surface 5, and the work of forming a large number of holes 61 is troublesome.

On the other hand, according to the electric discharge crushing method according to the best mode, one or a small number of grooves 7 are formed on one surface 5 and, for example, as shown in FIG. The work can be efficiently and finely crushed, and the operation can be simplified as compared with the case where a large number of holes 61 are formed.
In particular, when crushing a flat crushing object such as the concrete plate 4, the concrete plate 4 is efficiently and finely crushed by forming a small number of grooves 7 on the surface and causing discharge in the grooves 7. it can.

  In the conventional electric discharge crushing method shown in FIG. 7, when the thickness dimension of the concrete plate 4 is relatively small, the depth dimension t (see FIG. 5B) of the hole 61 is also reduced, and the electrode device 70. Accordingly, the size of the discharge portion and the hole 61 for accommodating the non-compressed body is also reduced. Therefore, when the discharge portion of the electrode device 70 does not enter the hole 61, the concrete plate 4 cannot be crushed. Even if the discharge part of the electrode device 70 enters the hole 61, the number of discharge parts of the electrode device 70 that enter the hole 61 decreases, and the pressure generated by the discharge in each hole 61 is small. Therefore, it is necessary to form a large number of holes 61 on one surface 5 and to discharge each of the individual holes 61 in order one by one. Becomes annoying.

Best form 2
The best mode 2 will be described with reference to FIG. 6 (a); FIG. 6 (c) is a plan view, and FIG. 6 (b) is a cross-sectional view taken along line AA of FIG. 6 (a).
When the object to be crushed is a concrete structure 4A with no edges, such as a floor slab that forms a floor of a road or a bridge, or a floor or wall of an existing construction, one of the edges of the concrete structure 4A is not cut. A groove 79 (hereinafter referred to as a free groove in the best mode 2) is provided in the vicinity of the groove 7 (hereinafter referred to as a discharge groove in the best mode 2) provided on the surface 5A. That is, the inner surface of the free groove 79 becomes a free surface. For example, the free groove 79 and the discharge groove 7 are formed side by side as shown in FIGS. 6A and 6B, or the discharge groove 7 is surrounded on one surface 5A as shown in FIG. 6C. Thus, the free groove 79 is formed. The free groove 79 is formed at a location separated from the discharge groove 7 by a predetermined distance W. The distance W is determined such that the pressure generated by the energy generated during the discharge in the discharge groove 7 can reach the free surface. The groove width P of the free groove 79 may be smaller than the groove width e of the groove 7, for example, about 5 mm.
According to the best mode 2, the concrete structure 4A can be efficiently crushed by the pressure generated by the energy generated during the discharge in the discharge groove 7 reaching the free surface of the free groove 79.
Although not shown, the free groove 79 may be a groove formed so as to extend obliquely from the one surface 5A toward the other surface 6A.
Further, the depth Q of the free groove 79 shown in FIG. 6 (b) is preferably increased because the area of the free surface can be increased. If the depth Q is greater than the depth R of the discharge groove 7, the free surface is the other surface 6. It is preferable that it can be formed up to near.
6 may be used as a discharge groove 7 instead of the free groove 79 shown in FIG. 6, and the inner surface of the dual-purpose groove may function as a free surface when discharging in the discharge groove 7.
When the distance from one surface 5A of the concrete structure 4A to the other surface 6A, that is, the thickness V of the concrete structure 4A (see FIG. 6B) is thin, and the surface 6A functions as a free surface. In this case, the free groove 79 may not be formed.

By interposing an adhesion maintaining material such as a rubber sheet or a urethane sheet between the lower surface of the weight 43 and the surface 5 of the concrete plate 4, between the lower surface of the weight 43 and the adhesion maintaining material, and the surface 5 It is possible to effectively prevent leakage of pressure from between the adhesion maintaining material. You may use the weight 43 by which the adhesiveness maintenance material was previously attached to the surface turned to the surface 5 side of the concrete plate 4. FIG.
A rigid plate such as a metal plate as a covering material is placed on the surface 5 of the concrete plate 4, and the surface of the rigid plate and the surface 6 of the concrete plate 4 are sandwiched and fixed by a jaw of a vise device (not shown). Then, the discharge may be performed. It is preferable to provide the above-described adhesion maintaining material between the surface 5 and the rigid plate because it is possible to effectively prevent pressure leakage. You may use the rigid board by which the adhesiveness maintenance material was previously attached to the surface orient | assigned to the surface 5 side of the concrete plate 4. FIG.
The weight 43 can be dispensed with if one surface 5 of the concrete plate 4 faces downward and is placed on a flat plate mount (not shown) for discharging.
A coaxial electrode device as shown in FIG. 7 may be used as the electrode device.
The groove 7 may be a groove that has a groove length a longer than the width e, and may be a groove that does not extend continuously from one edge 8 to the other edge 9. For example, if a groove in which one edge 8 is opened and the other edge 9 is not opened, or a groove in which neither one edge 8 nor the other edge 9 is opened, the groove 7 The work of closing the openings of both edge portions 11; 11 with the filling material 41 such as putty can be reduced, and the work can be simplified. In this case, if a groove for guiding the wire 37 from the groove 7 to the outside is formed on the surface 5 of the concrete plate 4 or the surface of the covering material, the adhesion between the surface 5 and the covering material is increased, and the discharge The pressure loss caused by the energy generated at the time can be effectively prevented, which is preferable.
The groove 7 may be a groove formed to extend obliquely from the surface 5; 5A to the surface 6; 6A.
As the distance maintaining member 31, a rubber band, a dedicated connector, an adhesive tape such as a vinyl tape, or the like can be used.

The figure which shows a cutter apparatus (best form 1). The figure which shows an electric discharge crushing apparatus and the crushing object (best form 1). The figure which shows the process of the electric discharge crushing method (best form 1). The figure which shows the crushing state of a concrete plate (best form 1). The figure which shows how to provide the hole in the case of crushing a concrete plate with the conventional electric discharge crushing method. The figure which shows the example of formation of a free surface (best form 2). The figure which shows the conventional electric discharge crushing apparatus and the crushing target object.

Explanation of symbols

1 discharge crushing device, 3 electrode device, 4 concrete plate (object to be crushed),
5 surfaces, 7 grooves, 30 discharge parts, 42 incompressible body (pressure transmission medium),
43 Weight (covering material), 50 cutter device, 52 cutter,
52b Circular plate, 54 rotation center axis.

Claims (2)

  Two cutters with cutting blades are provided on the circumference of the circular plate, and the two cutters are provided at predetermined intervals so that the surfaces of the circular plates face each other in parallel. A cutter device characterized in that the cutter device is provided so as to be rotatable about a rotation center axis passing through the center of the shaft in a straight line.   By using the cutter device according to claim 1 and rotating the two cutters of the cutter device to cut the surface of the object to be crushed, the thickness of the two circular plates is reduced on the surface of the object to be crushed. A groove having a groove width equal to or longer than the combined length is formed, and a discharge part of the electrode device and a pressure transmission medium surrounding the discharge part are provided in the groove, and the opening of the groove where the discharge part and the pressure transmission medium are installed is covered. A discharge crushing method comprising crushing an object to be crushed by applying a voltage to an electrode of a discharge part and discharging the electrode in a state of being covered with a material.

Images