JPH075292A - Method for cutting out structure in blocks and device used for the cutout - Google Patents

Abstract

PURPOSE:To enable arbitrarily changing the cutout depth from the surface of a structure and cutting out arbitrary size of block. CONSTITUTION:A main body frame 1 extends in vertial direction and from the both top and bottom ends of the main body frame 1, rod shape wire guide parts 2 extend toward the wall surface of the structure. To the main body frame 1, a wire drive device 4 is placed and it constitutes a wire saw device main body 3 together with the main body frame 1. At the tip ends of the wire guide parts 2, guide pulleys 9 are rotablly supported with axes, respectively. Between the guide pulleys 9, a cutting wire 5 is stretched. The wire saw device of the above structure is fixed at the bottom of a device support 12 putting an extensible leg part 13 in between.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of cutting a structure into blocks for disassembling a shield wall in a nuclear reactor, and a wire saw device and a cutting device used for the cutting.

[0002]

2. Description of the Related Art When it is necessary to cut out a structure into blocks, for example, there is a core core side dismantling operation of a shielding wall having a cylindrical hollow portion in a nuclear reactor. The shield wall in this nuclear reactor has a thickness of about 3 m in the case of a PWR-type nuclear power plant, and it is usually 1 from the core side (inner surface side) surface.
Since about m is activated, when dismantling this shielding wall, it is necessary to dismantle the activated part first.

In the prior art, when disassembling the shield wall from the furnace core side, for example, Japanese Patent Laid-Open No. 2-307097.
Japanese Patent Application Laid-Open No. 4-42100 and Japanese Patent Laid-Open No. 4-42100 have been proposed. In this method, first, two pairs of holes lined up at a predetermined interval are cut vertically and downward from the upper end surface of the shielding wall, and then a pair of wire guide portions extending downward from the main body of the apparatus are provided. At each tip of the wire guide portion, a wire guide device is prepared in which a guide pulley is pivotally mounted with the rotating shaft being orthogonal to the extending direction of the wire guide portion. By operating the wire driving device installed in the wire saw device while individually inserting the guide portions, the cutting wire stretched with a predetermined tension between the guide pulleys of the two wire guide portions is Vertically cut the structure position connecting the pair of holes downward from the upper end surface,
Thus, the back surface of the block to be cut out is formed.

Next, along the hole of one of the pair of holes and the inner peripheral surface of the shielding wall, two wire guide portions are respectively moved from the upper side to the lower side in the same manner as described above, so that the two wire guide portions are moved downward. The shielding wire is cut in the thickness direction by the cutting wire hung between the guide pulleys of the guide section to form one side surface of the block to be cut out, and also between the other hole and the inner peripheral surface of the shielding wall. Similarly cut to form the other side of the block to be cut out.

Next, another pair of wire guide portions in which the rotary shaft of the guide pulley is axially mounted in parallel with the extending direction of the wire guide portion (vertical direction) are prepared, and the wire guide portions are respectively paired as described above. Insert the cutting wire into the hole of the above, and hang it between both guide pulleys so as to circulate along the cut grooves in the thickness direction (positions on both side surfaces of the cut block) and the inner peripheral surface of the shielding wall. In this state, the wire saw device is driven to cut the shielding wall in the thickness direction to form the lower surface of the block to be cut out.

In this way, four cut surfaces of the block to be cut are formed, and the cut surface is cut into a block-shaped disassembled piece of 6 surfaces by the cut surface and the upper end surface and the inner peripheral surface of the shielding wall. The shielding wall is disassembled by repeatedly cutting out and removing the block-shaped dismantling pieces in the circumferential direction from the top end surface of the shielding wall, which is a structure, in order.

[0007]

However, in the conventional method of cutting out a structure as described above into blocks,
While cutting into small block-like dismantled pieces, the dismantling pieces are repeatedly removed and the dismantling work is carried out, but the shielding wall of the reactor is part of the whole building and is a narrow place, It is difficult to perform parallel work, and it may become a critical path during the dismantling work.

Further, the activated range is not always at a constant depth, and in some cases an uneven shape or an oblique rear surface cutting shape is preferable, but in the above-mentioned conventional method, from the surface of the structure. Since the plane connecting the above-mentioned pair of holes is made into a back surface shape without adjusting the cutting depth, and it is unconditionally cut, it is not possible to effectively cut only the activated part. The shape of the back cut cannot be set to an arbitrary shape. This phenomenon becomes more remarkable as the block to be cut out is made larger, that is, the distance between the pair of holes is made larger.

Further, in the above-mentioned conventional method, the cutting in the vertical direction and the cutting in the horizontal direction have to be carried out in two steps by using different wire guide portions, and the above-mentioned cutting is troublesome. There is also. The present invention has been made by paying attention to the problems as described above, and an object thereof is to enable the cutting depth from the structure surface to be arbitrarily changed, and to enable the cutting of a block of an arbitrary size. There is.

[0010]

In order to achieve the above object, a method of cutting out a structure of the present invention in a block form is to form two grooves having a predetermined depth along the surface of the structure, The cutting wire of the wire saw device cuts the space between the two grooves from the surface of the structure in the depth direction, and continuously changes the position in the depth direction to extend the cutting wire in the extending direction of the groove. Back cutting by moving to
It is characterized in that the cutting wire is moved toward the surface in the depth direction of the groove to cut between the two grooves.

Further, for a structure having a cylindrical hollow portion, two grooves, which are spaced apart from each other by a predetermined distance in the extending direction of the hollow portion, are formed on the inner peripheral surface of the hollow portion at a predetermined depth. Each of which is formed along the circumferential direction, and is cut in the depth direction from the surface of the structure between the two grooves by the cutting wire of the wire saw device, and the position in the depth direction is continuously cut. Rear cutting is performed by moving the cutting wire along the circumferential direction of the hollow portion while changing, and further, moving the cutting wire toward the surface in the depth direction of the groove to move between the two grooves. It is characterized by cutting.

The wire saw device used for the above-mentioned cutting is a wire saw device for cutting a structure, which is equipped with a wire driving device and is movable along the surface of the structure, and the wire saw device. A pair of wire guide portions extending in the depth direction from the main body into the two grooves formed in the structure, and a rotating shaft pivotally and rotatably attached to the distal end portion of each wire guide portion. It is characterized in that it is provided with a guide pulley capable of guiding the cutting wire guide and an endless annular cutting wire which is hung between a pair of the guide pulleys and extends along the wire guide portion.

The slicing device used for the slicing is a slicing device for cutting the inner peripheral surface side of the hollow portion in a structure having a cylindrical hollow portion, and the space in the hollow portion. 4. A device support body extending along the extending direction of the hollow portion, a foot portion extending from the device support body so as to be capable of expanding and contracting toward the inner peripheral surface of the hollow portion, and fixed to the tip portion of the foot portion. And a wire saw device.

[0014]

According to the cutting method of the present invention, two grooves are formed at the boundary between a portion to be cut such as an activated portion and the other portion, and the structure surface between the two grooves is formed into a block shape. This is a method of cutting out, and it is possible to cut out while changing the back surface depth of the block to be cut out at any time.

That is, at a predetermined position between the two grooves, a cutting wire is used to cut between the grooves in a depth direction to a predetermined depth to form one side surface of the block to be cut out. By moving the cutting wire as it is along the extending direction of the groove, the cutting wire sequentially cuts a position of a predetermined depth from the surface of the structure to form the back surface of the block to be cut out.

When the cutting wire is moved in the groove direction, the depth position from the surface of the structure is changed at any time so that the depth from the surface of the structure to the back surface of the cutting can be arbitrarily set to an arbitrary depth. The rear surface can be cut into a stepped shape or the like. Then, the structure is cut by moving the cutting wire toward the surface of the structure, and the other side surface of the block to be cut out is formed.

Then, the cut-out block is formed by the cut-out three surfaces, the surface of the structure and the inner surfaces of the two grooves, and is cut off from the structure. By cutting with the above method, it is possible to cut into blocks of any size, and regardless of the size of the block, the back depth from the surface of the structure You can set it to suit your needs.

With respect to a structure forming a cylindrical hollow portion such as the core side of the shield wall of a nuclear reactor, the structure can be formed in the circumferential direction by the structure described in claim 2. Can be cut into a fan-shaped block having a free angle, or can be cut into a donut-shaped block by performing one back face cutting in the circumferential direction. Then, for the above cutting, for example, a wire saw device as described in claim 3 is used.

In this wire saw device, by inserting the pair of wire guide portions into the grooves, respectively, the cutting wire suspended between the guide pulleys axially attached to the tips of the pair of wire guides is used. The surface of the structure between the grooves is cut in the depth direction. If the device body is moved along the surface of the structure as it is, each of the wire guide portions also moves along the groove.

At this time, a load is applied to the cutting wire in the direction opposite to the above movement, and the rotating shaft of the guide pulley automatically turns and rotates accordingly. Therefore, the wire guide portion is once pulled out from the groove and guided. There is no need to reset the pulley direction. In this way, since the rotation axis of the guide pulley is automatically changed in accordance with the cutting direction in accordance with the cutting direction, it is possible to continuously cut into an arbitrary arbitrary shape.

Then, as described above, the wire guide portion, that is, the guide pulley is moved along the extending direction of the groove, whereby the back surface cutting is performed. At this time, by changing the distance between the wire saw device body and the surface of the structure at any time, the position in the depth direction within the groove of the wire guide part, that is, the guide pulley, is changed at any time, and the back surface of the block to be cut out is uneven. Or any shape such as a slope.

When the inner peripheral surface of the structure forming the cylindrical hollow portion is cut, the cutting device according to the fourth aspect is adopted, so that the device supporting member and the foot portion are interposed. As a result, the wire saw device can be operated from outside the hollow portion, and it is not necessary for the worker to approach the activated position.

[0023]

Embodiments of the present invention will be described with reference to the drawings.
First, the structure of the wire saw device will be described. As shown in FIG. 1, the main body frame 1 extends in the vertical direction, and the bar-shaped wire guide portions 2 are respectively formed from the upper and lower end portions of the main body frame 1 toward the wall surface of the structure. Extend the main body frame 1
A gate-shaped frame body is formed by the pair of wire guide portions 2.

A wire drive device 4 is installed on the main body frame 1 to form a wire saw device main body 3 together with the main body frame 1. In the wire driving device 4, the motor unit 4 a is fixed to the main body frame 1, and the motor unit 4 a
A tensioner 4b extends from the body frame 1 in a direction opposite to the wire guide portion 2 from a. The tensioner 4b can be expanded and contracted in the protruding direction by a cylinder device or the like. A wire drum 4c around which a cutting wire 5 is wound around the tip of the tensioner 4b.
Is mounted on the shaft, and the wire driving drum 4c and the motor unit 4 are
A belt 4d is hung between the drive shaft of a and the drive shaft of a.

Further, as shown in FIG. 2, a spherical pair socket 6 is formed at the tip of the wire guide portion 2, and a spherical body 7 is fitted into the socket 6, and the spherical body 7 is fitted in the socket 6.
The arm portion 8 is fixed to the. The arm portion 8 is composed of an arm body 8a protruding from the spherical body 7 and a pair of support portions 8b and 8c for supporting the shaft of the guide pulley 9 from the left and right. That is, one end of the arm body 8a is fixed to the sphere 7, and the support portions 8b and 8c are provided in a state of being offset to the left and right from the other end of the arm body 8a.
A support shaft 10 that rotatably supports the guide pulley 9 is provided between both ends of b and 8c, and the support shaft 10 rotatably supports the guide pulley 9.

Of the pair of support portions 8b and 8c, one support portion 8b is integrally formed with the arm body 8a and the support shaft 10, while the other support portion 8c is attached to the support shaft 10 at one end thereof. The part is pivotally attached and can be opened and closed laterally around its pivot position, and the other end of the other support part 8c and the arm body 8a are fitted by a known fitting mechanism. Then, only when a predetermined force or more is applied in the opening direction, the fitting is released. The force equal to or larger than the predetermined value is assumed to be a strong force applied to the other supporting portion 8c for detaching the cutting wire 5 from the guide pulley 9, and
Due to vibration of the cutting wire 5 during operation, the cutting wire 5
Is assumed to be a force that does not disengage from the guide pulley 9. This allows the cutting wire 5 to be wound around or removed from the guide pulley 9.

The arm body 8a may be replaced by the arm body 8a.
It may be detachably fixed by a lock mechanism or the like that connects between and the other support portion 8c by inserting a detachable pin or the like. Further, the cutting wire 5 is wound around the guide pulleys 9 provided at the distal ends of the pair of wire guide portions 2, and the cutting wire 5 is interposed between the guide pulleys 9.
Is stretched. Further, the cutting wires 5 wound around the respective guide pulleys 9 have the wire guide portions 2 respectively.
Along the main body frame 1 and is wound around the wire driving drum 4c of the wire driving device 4 via an auxiliary pulley 11 provided on the main body frame 1. As a result, the cutting wire 5 is arranged in an endless ring shape and driven by the wire driving device 4, and a predetermined tension is applied by the expansion and contraction of the tensioner 4b.

The configuration of the spherical pair composed of the socket 6 and the spherical body 7 is such that the arm body 8a fixed to the spherical body 7,
That is, in order that the guide pulley 9 can only turn (fall over) in a predetermined direction, the guide groove 6a is cut out in the circumferential direction along the turning direction with respect to the socket 6, and along the guide groove 6a. The arm body 8a is rotatable.

The turning direction is set so as to extend in the vertical direction. Further, the spherical pair allows the guide pulley 9 to rotate about the arm body 8a. As a result, the rotating shaft of each guide pulley 9 is automatically swung by the force applied to the cutting wire 5 when the wire saw device is driven, so that the cutting wire 5 is removed from the guide pulley 9. Since the cutting wire 5 is guided while being prevented, it is not necessary to replace the wire guide portion 2 as in the conventional case, and the cutting direction can be continuously changed.

Further, the wire saw device having the above structure is supported by the lower end of the device support 12 extending in the vertical direction. A foot portion 13 extending toward the wire saw device body 3 is fixed to a lower end portion of the device support body 12.
3 can be expanded and contracted by a cylinder device or the like in the extending direction of the foot portion 13, and the other end is fixed to the main body frame 1 of the wire saw device, so that the expansion and contraction causes the wire saw device main body 3 to move horizontally. The wire saw device, the foot portion 13, and the device support 12 form a part of the cutting device so that the wire saw device can move forward and backward.

Next, a method for cutting the structure 20 into blocks using the above wire saw device and cutting device will be exemplified. In the following example, first, a method of cutting out a vertical surface side such as a wall surface of the concrete structure 20 into blocks will be described. First, using a known cutting device, two grooves 21 and 22 having a predetermined depth and having a width into which the wire guide portion 2 and the guide pulley 9 can be inserted are formed.
Cut into strips and walls.

As shown in FIG. 3, the two grooves 21, 22 are formed so as to extend in the left-right direction by a predetermined length in the vertical position of the portion to be cut out on the wall surface 20a. Next, when the main body frame 1 (the wire saw device main body 3) is brought close to the wall surface 20a so that the wire guide portions 2 are respectively inserted into the two grooves 21 and 22, as shown in FIG. The guide pulley 9 fixed to the tip of the guide portion 2 is in a state of being inserted to the bottoms of the grooves 21 and 22, respectively. In FIG. 4, only the guide pulley 9 of the wire saw device is shown.

In this state, the cutting wire 5 stretched between the guide pulleys 9 extends, for example, along the upper wire guide portion 2 into the upper grooves 21 and 22, It is wound around the guide pulley 9 in the grooves 21 and 22, and from there, extends again in the grooves 21 and 22 toward the surface of the wall surface 20a, and further to the wall surface 20 between the grooves 21 and 22.
It is arranged so as to extend into the groove 22 on the lower side via the surface a, be wound around the other guide pulley 9, and further extend in the surface direction of the wall surface 20a along the wire guide portion 2 on the lower side.

At this time, stress is applied to the cutting wire 5 between the guide pulleys 9 in the extending direction of the grooves 21 and 22, so that the rotation axis of each guide pulley 9 is substantially vertical. It is automatically turned. Then, the wire saw device body 3 is fixed at the current position, and the guide pulley 9
The wire drive device 4 of the wire saw device is operated. Then, the cutting wire 5 is operated endlessly, and the structure 20 is cut from the wall surface 20 a in the depth direction of the grooves 21 and 22.

That is, the guide pulley 9 does not move, and
By applying a predetermined tension to the cutting wire 5, the length of the cutting wire 5 located between the guide pulleys 9 is sequentially shortened, and as shown in FIG. The structure 20 is gradually cut from the surface of the wall surface 20a in the depth direction of the grooves 21 and 22, and as shown in FIG. 6, one side surface B1 of the block B to be cut out is formed.

Note that, in FIG. 5, the portion which is not yet cut is shown as remaining in the trapezoid, but this trapezoid is for convenience of description, and in reality, it is 2
The cutting line by the cutting wire 5 between the two guide pulleys 9 is sequentially cut in a curved shape convex upward, and the convex portion is gradually lowered and the radius of curvature of the curve is gradually increased.

Subsequently, the wire saw device body 3 is attached to the wall surface 20.
When it is moved in the extending direction of the grooves 21 and 22 along a, the wire guide portions 2 respectively inserted in the grooves 21 and 22 also move along the grooves 21 and 22 following the movement.
At this time, the cutting wire 5 stretched between the guide pulleys 9 is applied with stress in the direction opposite to the moving direction, so that the force causes a swinging motion in each guide pulley 9, The cutting wire 5 is smoothly fed by the guide pulley 9.

Then, as the wire guide portion 2, that is, the guide pulley 9 moves in the grooves 21 and 22 in the extending direction thereof, as shown in FIG. Is cut by the cutting wire 5 to form the back surface B2 of the block B to be cut out. In FIG. 7, the rotation axis of the guide pulley 9 is illustrated as being horizontal, but the tension applied to the cutting wire 5 between the wire saw device main body 3 and the guide pulley 9 causes the guide pulley 9 to actually rotate. The rotating shaft of the pulley 9 is inclined.

Further, in the case of the back surface cutting, if the cutting is performed only by the movement of the wire saw device main body 3, the applied stress becomes considerably large. Therefore, as shown in FIG. The guide pulley 9 needs to be positioned ahead of the cutting line so that the cutting wire 5 in the cut state is pulled. For that purpose, the cutting wire 5 must be longer than when cutting in the depth direction. Therefore, the wire saw device main body 3 is brought closer to the wall surface 20a of the structure 20 than in the case of cutting in the depth direction, so that the cutting wire between the guide pulleys 9 can be spared without changing the entire length of the cutting wire 5. To have

In the rear surface cutting described above, the grooves 21, 22 are
Although it is described that the wire saw device main body 3 is moved back and forth from the wall surface 20a as appropriate,
As shown in FIG. 9, an oblique shape or a step may be formed on the cut back surface B2. Next, by moving the wire saw device main body 3 again in the direction away from the wall surface 20a, as shown in FIG. Move to one direction. Then, by applying a predetermined tension to the cutting wire 5, the portion of the structure 20 between the two grooves 21 and 22 is thickened toward the surface of the structure 20 by the cutting wire 5 between the guide pulleys 9. The block is cut in the vertical direction to form the other side surface B3 of the block to be cut out.

As a result, both side surfaces B1 and B3 and the back surface B2 of the block B to be cut out are formed, and the block is separated from the structure 20, as shown in FIG. In the above description, the two grooves 21, 22 are formed so as to extend in the horizontal direction, but they are formed so as to extend in an oblique direction or a vertical direction, and the two grooves 21, 22 are formed in a block shape. It may be cut out, or may be cut in parallel and in a wavy shape in accordance with the shape in which the grooves 21 and 22 are cut out.

If the body frame 1 of the wire saw device is configured to be expandable / contractible in the axial direction (vertical direction) so that the distance between the two guide pulleys 9 can be changed appropriately, the two grooves 21, 22 are formed. Do not cut in parallel, so that it extends in a shape that matches the boundary shape of the block you want to cut out 2
The grooves 21 and 22 of the strip are individually cut to form the grooves 21 and
You may make it cut out the structure 20 part between 22.

When cutting out from the upper end of the structure 20, the upper end surface of the structure 20 is regarded as the upper grooves 21 and 22, and only one of the grooves 21 and 22 is cut along the wall surface 20a. The upper end face and the grooves 21, 22 are cut out in a block shape. Further, in the above description, an example in which the vertical surface side of the structure 20 such as the wall surface 20a of the structure 20 is cut out in a block shape has been described. However, since the above example is an example, the structure 20 such as a bridge is not shown. It may be adopted to cut out the upper surface side or the lower surface side into a block shape. In this case,
The wire saw device is arranged so that the main body frame 1 extends horizontally and the wire guide portion 2 extends vertically.

Next, a case will be described in which the core side of the shield wall 30 of the nuclear reactor, which is a structure forming a cylindrical hollow portion, is cut out in a block shape. First, using a known cutting device,
The upper and lower portions of the activated portion on the inner peripheral surface of the shielding wall 30 are cut annularly along the circumferential direction to form two grooves 21 and 22.

Next, by inserting the device support 12 from the upper end opening of the shielding wall 30, the wire saw device fixed to the lower end of the device support 12 is formed into a hollow shape by the shielding wall 30. The wire saw device is inserted into the furnace core and horizontally opposed to the shield wall 30. Next, foot 13
As shown in FIG. 1, the wire saw device main body 3 is brought closer to the shield wall 30 by extending the wire guide portion 2 by a predetermined amount, and thus the wire guide portions 2 located above and below are formed in the grooves 2 formed as described above.
1 and 22 are inserted.

Then, the guide pulley 9 fixed to the tip of the wire guide portion 2 is inserted into the grooves 21 and 22 respectively.
It will be in the state that it has been inserted to the bottom of. In this state,
The cutting wire 5 hung between the guide pulleys 9
Is extended, for example, along the upper wire guide portion 2 into the upper groove 21, and is wound around the guide pulley 9 in the groove 21. Toward the bottom in the groove 22 on the lower side, is wound around the guide pulley 9 on the other side, and further extends toward the bottom in the groove 22 on the lower side. It is arranged so as to extend in the surface direction of the wall surface 20a along the wire guide portion 2.

Then, by fixing the device supporting body 12, the wire saw device main body 3 is fixed at the present position and the movement of the guide pulley 9 is prevented, and then the wire driving device 4 of the wire saw device is operated. Then, the cutting wire 5 is operated endlessly and the depth direction of the grooves 21 and 22 (shielding wall 3
The shielding wall 30 between the grooves 21 and 22 is cut in the thickness direction of 0).

That is, the guide pulley 9 does not move, and
By applying a predetermined tension to the cutting wire 5, the length of the cutting wire 5 located between the guide pulleys 9 is sequentially shortened, so that the structure 20 between the grooves 21 and 22 is covered by the wall surface 2.
It is gradually cut from 0a in the depth direction of the grooves 21 and 22.
Subsequently, by axially rotating the device support 12, the wire saw device body 3 moves in the circumferential direction along the shielding wall 30,
Following this, the wire guide portions 2 respectively inserted in the upper and lower grooves 21 and 22 move along the grooves 21 and 22.

At this time, stress is applied to the cutting wire 5 stretched between the guide pulleys 9 in the direction opposite to the moving direction, so that the force causes a swinging motion of each guide pulley 9. Then, the cutting wire 5 is smoothly fed by the guide pulley 9. Then, as the wire guide portion 2, that is, the guide pulley 9 moves in the grooves 21 and 22 in the extending direction thereof, as shown in FIG.
The portion located between both guide pulleys 9 is cut by the cutting wire 5 to form the back surface of the block B to be cut out.

In the above-mentioned back surface cutting, the grooves 21, 22 are
Although the wire saw device main body 3 is moved along the direction, the wire saw device main body 3 may be moved back and forth from the wall surface 20a at the same time as the above movement to form an oblique shape or a stepped portion on the cut back surface. By rotating the device support 12 almost once, the guide pulley 9 makes one round along the annular grooves 21 and 22, and the cutting wire 5 located between the guide pulleys 9 makes a predetermined depth from the wall surface 20a. The position is the wall surface 2
The cutting of the block B along the line 0a is completed, so that the back surface cutting of the block B to be cut out is completed.

Next, the foot portion 13 is contracted to retract the wire saw device main body 3 from the shielding wall 30, the wire guide portion 2 and the guide pulley 9 are taken out from the grooves 21 and 22, and the first cut portion is inserted. And the cutting wire 5 is taken out. As a result, the doughnut-shaped block B is covered by the shield wall 30.
Will be cut out.

Incidentally, it is not always necessary to move the guide pulley 9 once along the grooves 21 and 22, and
You may cut | disconnect toward the surface of the shielding wall 30, and may cut out in a substantially fan-shaped block. As a result, it is possible to cut out a block of an arbitrary size, and also select an arbitrary shape for the back surface cutting of the block, so that it is possible to cut only the portion to be cut out.

Further, since the wire saw device is moved and moved back and forth through the device support 12, it is not necessary for an operator to approach the vicinity of the activated part at the time of cutting. In the above description, the shield wall 30 is cut out in the middle, but it may be cut out in a donut shape from the upper end surface of the shield wall 30 downward. That is, the upper end surface 30a of the shielding wall 30
Is regarded as a groove on the good side, and only one groove 22 is cut on the shielding wall 30 to remove the wire saw device body 3 from the shielding wall 30.
To the shield wall 30 along the upper end surface 30a of the shield wall 30 in the thickness direction by approaching the wire guide portion 2 of the wire saw device from the side, as shown in FIG.
The other wire guide portion 2 is inserted into the groove 22.

Then, similarly to the above, the shield wall 30 is cut in the thickness direction, and then continuously cut in the circumferential direction to cut out into a large donut-shaped block B, and the cut-out block B is cut out.
Is removed with a crane. This is the upper end surface 3 of the shielding wall 30.
By performing the work from 0a downward, the number of times of the work of cutting into blocks and the work of removal is reduced, and the critical path in the construction period at the time of disassembling the shielding wall 30 by the parallel work is reduced.

In the above-mentioned embodiment, an example in which the furnace core side of the shielding wall 30 having a cylindrical hollow portion is disassembled has been described, but another structure such as cutting out the inner peripheral surface of the tunnel into a block shape is used. Of course, it can be applied to the cutting out of the object 20.

[0056]

As described above, in the method of cutting out a structure of the present invention into blocks, the size of the block to be cut out can be set to any size and the thickness to be cut out can be set to any thickness. can do. At this time, by using the wire saw device of the present invention, one block can be continuously cut out from the structure.

Further, by utilizing the cutting device of the present invention, it is possible for the worker to cut out remotely without the need for the worker to approach the cutting position such as the activated part.

[Brief description of drawings]

FIG. 1 is a side view showing a wire saw device, a cutting device, and a shielding wall according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a wire guide portion and a guide pulley according to an embodiment of the present invention.

FIG. 3 is a diagram showing two grooves formed on the surface of a structure according to an example of the present invention.

FIG. 4 is a side sectional view showing a state in which the wire guide portion of the embodiment according to the present invention is inserted into the groove.

FIG. 5 is a side cross-sectional view showing a cutting process for forming one side surface of the block to be cut out according to the embodiment of the present invention.

FIG. 6 is a side sectional view showing a state in which one side surface of a block to be cut out according to the embodiment of the present invention is formed.

FIG. 7 is a side cross-sectional view showing a midway of cutting for forming a back surface of a block to be cut out according to an embodiment of the present invention.

FIG. 8 is a diagram showing a cutting process for forming a back surface of a block to be cut out according to an embodiment of the present invention.

FIG. 9 is a plan sectional view showing an example of the back surface shape of the embodiment according to the present invention.

FIG. 10 is a side sectional view showing a cutting start state for forming the other side surface of the block to be cut out according to the embodiment of the present invention.

FIG. 11 is a diagram showing cut out blocks of an example according to the present invention.

FIG. 12 is a diagram showing a rear surface cut state of a second embodiment according to the present invention.

FIG. 13 is a side view showing a block cutting start state of a third embodiment according to the present invention.

FIG. 14 is a side sectional view showing block removal of the third embodiment according to the present invention.

[Explanation of symbols]

 3 Wire Saw Device Main Body 4 Wire Driving Device 5 Cutting Wire 9 Guide Pulley 12 Device Support 13 Foot 20 Structure 20a Structure Surface 21,22 Groove 30 Shielding Wall B Blocks B1, B3 Side B2 Back

Claims (4)

[Claims] 1. A groove having a predetermined depth is formed along the surface of a structure.
Formed, and cut in the depth direction from the surface of the structure between the two grooves by a cutting wire of a wire saw device, and then continuously changing the position in the depth direction for the cutting. It is characterized in that back cutting is performed by moving the wire in the groove extension direction, and further, the two cutting grooves are cut by moving the cutting wire toward the surface in the groove depth direction. A method of cutting a structure into blocks. 2. A structure having a cylindrical hollow portion,
Two grooves are formed on the inner peripheral surface of the hollow portion at predetermined intervals in the extending direction of the hollow portion, each groove having a predetermined depth and along the circumferential direction, and are cut by a cutting wire of a wire saw device. By cutting between two grooves in the depth direction from the surface of the structure, and continuously moving the cutting wire along the circumferential direction of the hollow portion while changing the position in the depth direction at any time. A method of cutting a structure into blocks, which comprises cutting the back surface and further moving the cutting wire toward the surface in the depth direction of the groove to cut between the two grooves. 3. A wire saw device for cutting a structure, comprising: a wire saw device main body equipped with a wire driving device and movable along the surface of the structure; and a wire saw device body formed on the structure by the wire saw device main body. A pair of wire guide portions extending in the depth direction into the groove of the strip, and a rotating wire shaft pivotally and rotatably attached to the tip end portion of each wire guide portion to guide the cutting wire guide. A wire saw device, comprising: a guide pulley; and an endless annular cutting wire that extends between the pair of guide pulleys and extends along the wire guide portion. 4. A cutting device for cutting an inner peripheral surface side of a hollow portion in a structure having a cylindrical hollow portion, wherein a space in the hollow portion is formed along an extending direction of the hollow portion. An apparatus support body extending from the apparatus support body, a foot extending from the apparatus support body so as to extend and contract toward the inner peripheral surface of the hollow portion, and the wire saw device according to claim 3 fixed to the tip of the foot section. Cutting device.