JP2001062826A - Method and apparatus for cutting baserock and method and apparatus for treating to ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for cutting a bedrock capable of reducing number of steps and improving operability. SOLUTION: The apparatus for cutting a bedrock comprises a sheave assembly for setting substantially perpendicularly crossing two sheaves 2 to a bottom in a pair of laterally aligned blind holes 1 of blind holes 1 bored at four corners of a hexahedral shape cut out from the bedrock, a sheave and roller assembly for setting a sheave and a guide roller 2, 3 substantially perpendicularly crossing to bottoms of the other pair of the laterally aligned holes 1, a ground roller 11 provided at an upper pat o the other pair of the holes 1, a wire saw 5 for rotatably driving a cutting wire saw 4 along the sheave 2 and the roller 3 in the holes 1 through the roller 11, and a driving means for driving to move the saw 5 in a direction for separating the saw 5 from the hole 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cutting a rock from a flat rock into a hexahedral shape, and a method and an apparatus for treating a ground.

[0002]

2. Description of the Related Art A rock cutting method and apparatus for cutting rock from a flat rock into a hexahedral shape is disclosed, for example, in Japanese Patent Application Laid-Open No. 9-277249. That is, as shown in FIG. 11, the blind hole 1 is bowled at a position corresponding to the corner of the hexahedron in the rock, and the pulley 2 is fixed to the bottom of the pair of blind holes 1 via the support. The cutting wire 4 enters the one blind hole 1 via the ground roller 11, and extends upward along the pulley 2,
Crawl out on the ground, enter the other blind hole 1, extend upward along the pulley 2 a, return to the wire saw 5 via the ground roller 11, endless, rotate the wire saw 5 1 to form a vertical cutting line between the pair of blind holes. This operation is performed for each of the other three sides.

[0003] Next, a cutting wire 4 is arranged at the bottom of each vertical cutting line, passes through a blind hole via a pulley arranged at the bottom of a pair of blind holes on the side of a wire saw 5, and passes through ground rollers. The crossed wire saw is rotated and moved in a direction away from the blind hole to form a hexahedral bottom cutting line in the rock. This cuts out a hexahedral stone from flat rock.

[0004]

However, in the above-mentioned conventional technique, since it is necessary to form a cutting line for each surface of the hexahedron in the rock, the number of steps is increased and workability is poor. .

[0005] In addition, on a private road with trees on the shoulders, the roots of the trees have raised the ground, causing cracks or asperities on the asphalt. With a cutting wire for cutting off the root, anchoring to the ground is insufficient and it is difficult to set up a support in a blind hole, and during wire cutting, the inner wall of the blind hole collapses and the pulley is buried with earth and sand. For this reason, there was a problem that processing to the ground was impossible.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rock cutting method and a rock cutting device capable of reducing the number of steps and improving workability. It is in. Another object of the present invention is to provide a processing method and a processing apparatus for the ground, which can easily perform the processing on the ground.

[0007]

Means for Solving the Problems Among the present invention to achieve the above object, the invention according to claim 1 is a step of boring blind holes at four corners of a hexahedral shape cut out from rock in a rock cutting method. And setting two substantially orthogonal pulleys at the bottoms of a pair of blind holes arranged side by side via a pulley assembly, and a pulley and a guide roller for guiding the pulleys to the pulley / roller assembly. Setting at the bottom of another pair of blind holes arranged side by side, and inserting a cutting wire from a wire saw through one of the blind holes in the other pair of blind holes via a ground roller to pulley at the bottom. After that, it is inserted sequentially into the pair of blind holes and along a substantially orthogonal pulley,
Then, inserting into another blind hole of the other pair of blind holes, following the pulley, returning to the wire saw via the ground roller, and moving the wire saw in a direction away from the blind hole while rotating. Forming three vertical cutting lines of a hexahedral shape on the ground by removing the pulley assembly from the pair of blind holes, and then aligning the cutting wire with guide rollers in the other pair of blind holes. Forming a hexahedral bottom cutting line on the ground by moving the wire saw in the direction away from the blind hole while rotating
A step of removing the pulley / roller assembly from the other pair of blind holes and forming a remaining vertical cutting line in a hexahedral shape on the ground by moving the wire saw in a direction away from the blind holes while rotating. It is characterized by having. According to the present invention, it is possible to sequentially perform three vertical cuts, a bottom cut, and the remaining vertical cuts of a hexahedral shape simply by sequentially pulling out the pulley assembly and the pulley / roller assembly. Therefore, when cutting a hexahedral stone from a bedrock, the number of steps can be reduced and workability can be improved.

According to a second aspect of the present invention, in the rock cutting device, the blind hole boring at four corners of a hexahedral shape cut out of the rock is substantially provided at the bottom of a pair of side-by-side blind holes. A pulley assembly for setting two orthogonal pulleys, a pulley / roller assembly for setting a substantially orthogonal pulley and guide rollers at the bottom of another pair of blind holes arranged side by side, and the other pair A ground roller provided at the top of the blind hole, a wire saw for rotating a cutting wire passing along the pulley and the guide roller in each blind hole via the ground roller, and moving the wire saw away from the blind hole. And a driving means for driving. According to the present invention, a simple structure in which two substantially pulleys are fixed to the bottom of a pair of blind holes and a substantially orthogonal pulley / guide roller is fixed to the bottom of another pair of blind holes, respectively, is claimed. The operation and effect of the invention described in 1 can be obtained.

According to another aspect of the present invention which achieves the above and other objects, the invention according to a third aspect of the present invention provides a method for treating a ground, wherein a resin is formed in a blind hole at a position corresponding to four corners of a predetermined square in the ground. Erecting a cylindrical support having a slit through a pipe made of steel, enclosing the outside of the support at the four corners with a reinforcement frame, and fixing each support to the reinforcement frame; The two orthogonal pulleys are set on the bottoms of a pair of blind holes arranged side by side via a pulley assembly, and the pulleys and guide rollers for guiding the pulleys are arranged side by side via the pulley / roller assembly. Setting at the bottom of another pair of blind holes, and inserting a cutting wire from a wire saw through one of the blind holes in the other pair of blind holes via a ground roller to follow the pulley at the bottom. After that, it is inserted sequentially into the pair of blind holes Along the crossed pulleys, and then inserted into the other blind hole of the other pair of blind holes, along the bottom pulley, and return to the wire saw via ground rollers, rotating the wire saw Moving the wire in the direction away from the blind hole while allowing the cutting wire to penetrate the ground along the three sides of the square, and after removing the pulley assembly from the pair of blind holes, rotate the wire saw. And moving the cutting wire in the ground by moving the cutting wire away from the blind hole. According to the present invention, it is possible to easily process the ground by wire cutting, which has been impossible in the past, for example, to easily cut the root of a tree in the ground.

Further, according to a fourth aspect of the present invention, in the apparatus for treating a ground, a cylindrical shape with a slit is provided upright through a resin pipe in a blind hole at a position corresponding to four corners of a square in the ground. A pillar body, a reinforcing frame body for fixing the pillar body, and a pulley assembly that is supported in the pillar body and sets two substantially orthogonal pulleys at the bottoms in a pair of side-by-side blind holes, A pulley / roller assembly for setting a substantially orthogonal pulley / guide roller at the bottom of another pair of blind holes arranged side by side, and for cutting along the pulleys and guide rollers in each blind hole through the column. A wire saw for rotating and driving a wire, and a driving means for moving the wire saw in a direction away from the blind hole while rotating the wire saw are provided. According to the present invention, a cylindrical support having a slit is formed through a resin pipe in a blind hole at a position corresponding to each of four corners of a square, by assembling a reinforcing frame so as to surround the tree at the site even on the ground with trees. The function and effect of the invention described in claim 3 can be obtained by the structure in which the body is erected.

[0011]

(Embodiment 1) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG.
FIG. 2 is a perspective view showing a rock cutting apparatus according to Embodiment 1.
2 is a plan view showing the rock cutting apparatus of FIG. 1, and FIG.
FIG. 4 is a sectional view taken along line BB of FIG. 2.

The rock cutting apparatus according to the first embodiment uses blind holes 1a to 1d drilled at four corners of a hexahedral shape cut out from a rock when cutting rock from a flat rock into a hexahedral shape. The cutting wire 4 is moved along the two pulleys 2a, 2b and the pulley / guide rollers 2a, 3 arranged at the bottoms of the blind holes 1a to 1d, and the wire saw 5 is moved in a direction away from the blind holes 1c, 1d while rotating. Thus, the hexahedron-shaped three vertical cutting lines 8 are formed on the ground, and then the pulley assembly 6 and the pulley / roller assembly 7 are simply removed in order, so that the hexahedral bottom cutting line 9 and the remaining vertical lines are removed. It is characterized in that the cutting line 8 is formed on the ground.

More specifically, of the blind holes 1a to 1d drilled at four corners of a hexahedral shape cut out from rock,
A pulley assembly 6 is provided in a pair of side-by-side blind holes 1a and 1b, and two pulleys 2 whose rotation axes are substantially perpendicular to each other are provided at the bottom.
a, 2b are set, and a retaining portion 10 is mounted on the upper portion to prevent the retaining portion 10 from coming off via an anchor to the ground. Of the blind holes 1a to 1d drilled at the four corners of the hexahedral shape cut out from the rock, the pulley / roller assembly 7 is inserted into another pair of blind holes 1c and 1d arranged side by side.
Is provided, and a pulley 2a having a rotation axis substantially orthogonal to the bottom is provided at the bottom.
And a guide roller 3 are set, and a ground roller 11 and a retaining portion 10 capable of swinging are mounted on the upper portion, and are prevented from coming off via an anchor to the ground.

The cutting wire 4 from the wire saw 5 is passed through the ground roller 11 to the other pair of blind holes 1c and 1d.
One blind hole 1c is lowered, raised via a pulley 2a, brought out on the ground and crawled, and the same is performed for each of the pair of blind holes 1a and 1b. It is lowered into the other blind hole 1 d, raised via the pulley 2 a, brought out to the ground, changed its direction by the ground roller 11, and returned to the wire saw 5 in an endless manner.

The wire saw 5 is provided so as to be able to run on the rail, a winch or a chain block is provided as a driving means at a position in the extending direction of the rail, and the wire saw 5 is provided in a direction away from the pair of blind holes 1c and 1d. Is moved.

Next, a rock cutting method using the rock cutting apparatus having the above-described configuration will be described. FIG. 1 is a process diagram showing an initial state of three longitudinal cuts of a hexahedral shape, and FIG.
FIG. 6 is a process diagram showing a final state of three vertical cuts of a hexahedral shape, and FIG. 7 is a diagram showing two substantially pulleys pulled out from the bottoms of a pair of blind holes. FIG. 8 is a process diagram showing a final state of the hexahedral bottom cutting, and FIG. 9 is a process diagram showing a state where a substantially orthogonal pulley / guide roller is removed from the bottom of another pair of blind holes. is there.

When cutting a hexahedral stone from a flat rock, first, blind holes 1a to 1d are bored at four corners of a hexahedron cut from the rock. Next, the two pulleys 2a and 2b, which are substantially perpendicular to each other, are set on the bottom of a pair of blind holes 1a and 1b arranged side by side via a pulley assembly 6, while the pulley 2a and a guide for guiding the pulley 2a. Roller 3
Is set at the bottom of another pair of blind holes 1c and 1d side by side via a pulley / roller assembly 7.

As shown in FIG. 1, a cutting wire 4 from a wire saw 5 is inserted from one blind hole 1c in another pair of blind holes 1c and 1d via a ground roller 11 to be along a pulley 2a at the bottom. After that, it is sequentially inserted into the pair of blind holes 1a, 1b and along the substantially pulleys 2a, 2b at the bottom, and then inserted into the other blind hole 1d in the other pair of blind holes 1c, 1d. Then, it is returned to the wire saw 5 via the ground roller 11 along the pulley 2a at the bottom and stretched endlessly.

When the wire saw 5 is moved in a direction away from the other pair of blind holes 1c and 1d along the rail by driving means such as a winch while rotating the wire saw 5, FIG.
As shown in FIG. 6, three vertical cutting lines 8 having a hexahedral shape are formed while gradually moving downward on the ground, and a final state of vertical cutting as shown in FIG. 6 is obtained.

As shown in FIG. 7, a pair of blind holes 1a, 1b
After removing the pulley assembly 6 from the other pair of blind holes 1c,
A hexahedral bottom cutting line 9 is formed on the ground by moving the wire saw 5 in a direction away from the blind hole 1 while the cutting wire 4 is arranged along the guide roller 3 in 1d.
As shown in FIG. 8, when the bottom cutting line 9 approaches the guide roller 3, the guide roller 3 performs its function and the pulley 2a
The cutting wire 4 is guided in a centered state.

As shown in FIG. 9, another pair of blind holes 1c,
Pulley / roller assembly 7 is removed from 1d, and ground roller 11a is newly installed. And wire saw 5
Is rotated to move away from the blind holes 1c and 1d, thereby forming the remaining vertical cutting line having a hexahedral shape on the ground. As a result, the hexahedral vertical and bottom surfaces are cut off from the rock, and the hexahedral stones are lifted by a tow truck.

As described above, the three vertical cuts, the bottom cut, and the remaining vertical cut of the hexahedral shape can be sequentially performed only by sequentially pulling out the pulley assembly 6 and the pulley / roller assembly 7.
Therefore, when cutting a hexahedral stone from a bedrock, the number of steps can be reduced and workability can be improved. Further, two substantially pulleys 2a are fixed to the bottoms of the pair of blind holes 1a and 1b, and the substantially pulleys / guide rollers 2a and 3 are fixed to the bottoms of the other pair of blind holes 1c and 1d. With the simple structure described above, the above-described effect can be obtained.

(Embodiment 2) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 10 is a cross-sectional view illustrating a processing apparatus for processing the ground according to the second embodiment. The processing apparatus for the ground according to the second embodiment performs processing on the ground that was impossible due to insufficient anchors,
For example, it is characterized in that it is possible to cut a tree root in the ground with a cutting wire.

That is, the blind holes 1a to 1d at the positions corresponding to the four corners of the square on the ground
A cylindrical support body 15 with a slit 14 is erected through the resin pipe 13, and the resin pipe 13 has a structure that prevents the inner wall of the blind hole 1 from collapsing and is cut by a cutting wire.
A plurality of the slits 14 are formed at equal intervals in the circumferential direction. A cutting wire enters from outside, descends in the blind hole 1, rises via the pulley 2 a at the bottom, and goes out to extend vertically to the ground. It has the function of ensuring the formation of cutting lines. The support body 15
Is provided, and the reinforcing frame 16 is fixed.
Has a structure that can be assembled on site using a pipe 17.

A pulley assembly 6 is supported in the column 15 via bolts and nuts 18. The pulley assembly 6 is substantially perpendicular to the bottom of a pair of side-by-side blind holes 1a and 1b. This is for setting two pulleys 2a and 2b. A pulley / roller assembly 7 is supported in the other support body 15 via a bolt / nut 18, and this pulley / roller assembly 7 is substantially provided at the bottom of another pair of blind holes 1c and 1d in a side-by-side configuration. This is for setting the orthogonal pulley / guide rollers 2a and 3. A pulley 2a, 2b in each of the blind holes 1a to 1d through the support body 15, and a wire saw for rotating and driving a cutting wire wound around the guide roller 3, a direction separating from the blind holes 1c, 1d while rotating the wire saw. A winch is provided as a driving means for moving the motor.

Next, a method of processing the ground using the above-structured processing apparatus for the ground will be described. Processing to the ground, for example, when cutting the roots of trees in the ground with a cutting wire,
Ground treatment is performed through the following steps. (1) In the ground, blind support holes 1a to 1d bored at four corners of a square in which a tree stands in the center are provided with a cylindrical support 1 having a slit 14 through a resin pipe 13.
5 is erected. (2) The outside of the support 15 at the four corners is surrounded by the reinforcing frame 16 and each support 15 is fixed to the reinforcing frame 16. (3) The two pulleys 2a and 2b, which are substantially perpendicular to each other, are
Is set on the bottom of a pair of blind holes 1a, 1b arranged side by side, and the pulley / guide rollers 2a, 3 are set via a pulley / roller assembly 7 to another pair of blind holes 1c, 1 arranged side by side.
Set at the bottom of d.

(4) After the cutting wire from the wire saw is inserted through one blind hole 1c in the other pair of blind holes 1c and 1d via the ground roller and is made to follow the pulley 2a at the bottom,
It is sequentially inserted into a pair of blind holes 1a, 1b, and along the substantially orthogonal pulleys 2a, 2b at the bottom, and then the other pair of blind holes 1a, 1b.
c, 1d to be inserted into the other blind hole 1d and the bottom pulley 2
A is wound back along the a so as to return to the wire saw via the ground roller. (5) By moving the wire saw in a direction away from the blind holes 1c and 1d while rotating, the cutting wire is made to enter the ground along three sides of the square. (6) After removing the pulley assembly 6 from the pair of blind holes 1a, 1b, the cutting wire is slid inside the ground by moving the wire saw in a direction away from the blind holes 1c, 1d while rotating. If necessary, the pulley / roller assembly 7 is removed from the other pair of blind holes 1c, 1d, and then the cutting wire is moved in a direction away from the blind holes 1c, 1d while rotating the wire saw to thereby ground the cutting wire. Internally raise towards the remaining sides of the rectangle.

In this way, even on the ground with trees, the reinforcing frame 16 is assembled so as to surround the trees at the site, and the blind holes 1a to 1d at the positions corresponding to the four corners of the square are formed via the resin pipe 13. With the structure in which the cylindrical columnar body 15 with the slit 14 is erected, it is possible to easily perform processing on the ground with a cutting wire, for example, cutting of the root of a tree in the ground, which was conventionally impossible. .

The present invention is not limited to the first and second embodiments, and it is needless to say that various modifications can be made. For example, the method and apparatus for treating the ground according to the second embodiment can be applied to a method and an apparatus for cutting a thick forest or a root of a weed over a wide area.

Further, as shown in FIG. 10, a pair of ground rollers 11 shown in FIGS.
An extendable stay 100 may be erected by mounting a spring, and a ground roller 101 may be attached to the stay 100. During the cutting when the force is applied, the stay 100 contracts, but when the cutting is completed and the force applied to the cutting wire 4 becomes weaker, the stay 100 expands due to the elastic force of the spring. It is possible to visually confirm the end of cutting.

As shown in FIGS. 1 and 10, guide rollers 110 to 114 for guiding the cutting wire 4 may be provided above. This allows, for example,
Guide rollers 110 and 111 located on both sides;
When the cutting wire 4 is hung on the cutting wires 4 and 115 and the cutting wire 4 is detached from the guide rollers 112 and 113 serving as the back surfaces and the operation is performed, only the back surface can be cut. That is, it is possible to arbitrarily select the surface to be cut,
This is useful, for example, when the rock to be cut is hard and it is difficult to cut all three surfaces at the same time.

[0032]

As apparent from the above description, according to the first aspect of the present invention, in the rock cutting method, a hexahedral shape can be obtained simply by sequentially pulling out the pulley assembly and the pulley / roller assembly. Three vertical cuts, a bottom cut, and the remaining vertical cuts can be sequentially performed. Therefore, when cutting a hexahedral stone from a bedrock, the number of steps can be reduced and workability can be improved.

According to the second aspect of the present invention, in the rock cutting device, two pulleys having a substantially perpendicular shape are provided at the bottom of a pair of blind holes, and two pulleys having a substantially perpendicular shape are provided at the bottom of another pair of blind holes. The pulley and the guide roller can be formed in a simple structure only by fixing them, whereby the operation and effect of the first aspect can be obtained.

According to the third aspect of the present invention, it is easy to treat the ground with a cutting wire, for example, to cut the root of a tree in the ground, which was not possible with the conventional method. It can be carried out.

According to the fourth aspect of the present invention, in the apparatus for treating the ground, a reinforcing frame body is assembled so as to surround the trees on the site even on the ground where trees are thickened so as to correspond to the four corners of the square. It is possible to provide a simple structure in which a cylindrical support having a slit is erected in a blind hole at a position via a resin pipe, whereby the operation and effect of the invention according to claim 3 can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rock cutting device according to a first embodiment.

FIG. 2 is a plan view showing the rock cutting apparatus of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a process diagram showing an intermediate state of three vertical cuts of a hexahedral shape.

FIG. 6 is a process diagram showing a final state of three longitudinal cuts of a hexahedral shape.

FIG. 7 is a process diagram showing a state in which two substantially pulleys are extracted from the bottoms of a pair of blind holes.

FIG. 8 is a process diagram showing a final state of hexahedral bottom cutting.

FIG. 9 is a process diagram illustrating a state in which pulleys and guide rollers that are substantially orthogonal are removed from the bottoms of another pair of blind holes.

FIG. 10 is a cross-sectional view showing a processing apparatus for processing a ground according to a second embodiment.

FIG. 11 is a perspective view showing a conventional rock cutting method and cutting device.

[Explanation of symbols]

 1a, 1b, 1c, 1d Blind hole 2a, 2b Pulley 3 Guide roller 4 Cutting wire 5 Wire saw 6 Pulley assembly 7 Pulley / roller assembly 8 Vertical cutting line 9 Bottom cutting line 10 Retaining portion 11 11a Ground roller 13 Resin pipe 14 Slit 15 Prop 16 Reinforcement frame 17 Pipe 18 Bolt and nut

Claims (4)

[Claims] 1. A step of boring blind holes at four corners of a hexahedral shape cut out of a bedrock, and setting two substantially orthogonal pulleys at the bottom of a pair of side-by-side blind holes via a pulley assembly. On the other hand, a step of setting a pulley and a guide roller for guiding to the pulley to the bottom of another pair of blind holes arranged side by side through a pulley / roller assembly, and setting a cutting wire from a wire saw to a ground roller. After being inserted from one blind hole in the other pair of blind holes and following the pulley at the bottom, and sequentially inserted into the pair of blind holes and along the substantially orthogonal pulley inside, After that, it is inserted into the other blind hole of the other pair of blind holes and along the pulley at the bottom,
A step of returning the wire saw to the wire saw via a ground roller; a step of forming three vertical cutting lines in a hexahedron shape on the ground by rotating the wire saw in a direction away from the blind hole; and After removing the pulley assembly, the wire saw is rotated in a state in which the cutting wire is arranged along the guide rollers in the other pair of blind holes, and the wire saw is moved in a direction away from the blind hole, thereby forming a hexahedral bottom. Forming a cutting line on the ground, removing the pulley / roller assembly from the other pair of blind holes, and moving the wire saw in a direction away from the blind holes while rotating the wire saw so that the remaining vertical shape of the hexahedral shape is obtained. A rock cutting method comprising a step of forming a cutting line on the ground. 2. A pulley assembly for setting two substantially orthogonal pulleys at the bottom of a pair of side-by-side blind holes, among blind holes drilled at four corners of a hexahedral shape cut out from a rock. A pulley / roller assembly for setting a substantially orthogonal pulley and guide roller at the bottom of another pair of blind holes arranged side by side; a ground roller provided above the other pair of blind holes; A rock mass comprising: a wire saw that rotationally drives a cutting wire that is passed along rollers and guide rollers in each blind hole via rollers; and a drive unit that moves the wire saw in a direction away from the blind hole. Cutting equipment. 3. A step of erecting a cylindrical support having a slit through a resin pipe in a blind hole at a position corresponding to four corners of a predetermined square on the ground; While surrounding the outside with a reinforcing frame,
A step of fixing each support to the reinforcing frame, and setting two substantially orthogonal pulleys at the bottom of a pair of side-by-side blind holes via a pulley assembly while guiding the pulleys and guides to the pulleys Setting a guide roller to be performed at the bottom of another pair of blind holes arranged side by side through a pulley / roller assembly, and cutting a wire from a wire saw through the ground roller in the other pair of blind holes. After being inserted from one blind hole and following the pulley at the bottom, it is sequentially inserted into the pair of blind holes and along the substantially orthogonal pulley, and then the other blind hole in the other pair of blind holes is inserted. Inserting the wire saw into the hole along the pulley and returning it to the wire saw via the ground roller; and moving the wire saw in a direction away from the blind hole while rotating to cut along the three sides of the square. A step of infiltrating the wire into the ground, Removing the pulley assembly from the pair of blind holes, and then sliding the cutting wire inside the ground by moving the wire saw in a direction away from the blind holes while rotating the wire saw. Processing method to. 4. A cylindrical support having a slit which is erected through a resin pipe in a blind hole at a position corresponding to four corners of a square on the ground, and a reinforcing frame for fixing the support. A pulley assembly that is supported in the column body and sets two substantially orthogonal pulleys at the bottom in a pair of side-by-side blind holes; and a substantially orthogonal to the bottom of another pair of side-by-side blind holes. A pulley / roller assembly for setting the pulley / guide roller of the present invention; a wire saw for driving a cutting wire along the pulley and the guide roller in each blind hole through the support body; and a blind while rotating the wire saw. And a drive means for moving in a direction away from the hole.