JP7341428B2 - Cutting equipment and concrete block cutting method - Google Patents

Description

The present invention relates to a cutting device for cutting concrete, and a method for cutting out concrete blocks using this cutting device.

Conventionally, when decommissioning a nuclear reactor, it is necessary to dismantle the biological shielding wall surrounding the reactor. Since this shielding wall is a reinforced concrete structure with a large wall thickness, it has been proposed to sequentially cut out substantially rectangular parallelepiped-shaped concrete blocks from this shielding wall and remove them (see Patent Documents 1 and 2).
Patent Documents 1 and 2 disclose methods of cutting out substantially rectangular parallelepiped-shaped concrete blocks from a structure to be cut. Specifically, first, four guide holes are drilled in the structure to be cut, wire guide units are inserted into two of these guide holes, an endless cutting wire is passed around, and then the wire is rotated. By doing so, the surface between the guide holes is cut. By repeating this process, cut the bottom, both sides, back, and top of the concrete block in this order.

Here, the wire guide unit includes a rod-shaped wire guide support beam and a guide pulley swingably provided at the tip of the wire guide support beam. The rotation axis of this guide pulley is not provided on the central axis of the wire guide support beam.
In the wire guide units of Patent Documents 1 and 2, the rotation axis of the guide pulley is not provided on the central axis of the wire guide support beam, so the outer diameter of the wire guide unit is large. Therefore, it is necessary to increase the inner diameter of the guide hole, which poses a problem in that it takes time to cut out the concrete block.

Japanese Patent Application Publication No. 6-148393 Japanese Patent Application Publication No. 9-127295

An object of the present invention is to provide a cutting device that can cut out a concrete block in a short construction period by reducing the inner diameter of a guide hole, and a method of cutting out a concrete block using this cutting device.

The present inventors constructed a cutting device for cutting out a concrete block by a wire, a wire guide unit, and a drive device, and installed the cutting device at the tip of the support beam of the wire guide unit on the central axis of the support beam and on the central axis of the support beam. The present invention was developed based on the fact that by providing a pulley whose rotation axis is in a direction intersecting the , the inner diameter of the cutting guide hole can be made smaller than in the past, and work efficiency can be improved.
A cutting device according to a first aspect of the invention is a cutting device for cutting concrete (for example, cutting device 1 described below), and includes a ring-shaped wire embedded with diamond abrasive grains (for example, wire 10 described below), and a cutting device for cutting concrete. A pair of first wire guide units (for example, a first wire guide unit 11A described below) and/or a second wire guide unit (for example, a second wire guide unit 11B described below) that guide a wire, and rotate the wire. A drive device (for example, a drive device 12 described below), and each of the pair of first wire guide units includes a support beam (for example, a support beam 20 described below) extending in a predetermined direction, and an outer periphery of the support beam. A support part extending radially outward from the surface (e.g., support part 21 described below), a fixing part fixed to the tip of the support beam (e.g. fixing part 22, described later), and a part provided on the fixing part. and a pulley (for example, the first guide pulley 23 described below) that is rotatable on the central axis of the support beam (for example, the central axis C described later) and with a rotation axis in a direction intersecting the central axis, The pair of second wire guide units (e.g., second wire guide unit 11B described later) each include a support beam (e.g., support beam 20 described later) extending in a predetermined direction, and a support beam extending outward from the outer peripheral surface of the support beam. A support part (e.g., support part 21 described below) extending radially toward the support beam, and a rotatable member provided at the tip of the support beam so as to be rotatable around a central axis of the support beam (e.g., central axis C described later). (for example, the rotating section 24 described later), and a pulley (for example, the first A guide pulley 23).

According to the invention, the cutting device includes a ring-shaped wire, a pair of wire guide units, and a drive device. Therefore, a pair of cutting guide holes is formed in the concrete structure, a wire guide unit is inserted into each of the pair of cutting guide holes, and in this state, the wire is rotated by a drive device to cut the wire. Can cut concrete between guide holes.
At this time, since the support portion is provided around the support beam of the wire guide unit, this support portion is stretched within the cutting guide hole, and the support beam is held in a stable posture.
In addition, since the rotation axis of the pulley (first guide pulley 23) is placed on the central axis of the support beam, the inner diameter of the cutting guide hole only needs to be slightly larger than the outer diameter of the pulley (first guide pulley 23). Therefore, the inner diameter of the cutting guide hole can be made smaller than in the past, and work efficiency can be improved.
In addition, for the second wire guide unit, a pulley (first guide pulley 23) is provided on the rotating part, and this rotating part is made rotatable on the support beam, so the angle of the wire changes as concrete cutting progresses. However, by rotating the rotating part, it is possible to smoothly follow the change in the angle of the wire.

The concrete block cutting method of the second invention uses the above-mentioned cutting device to cut out a substantially rectangular parallelepiped-shaped concrete block (for example, concrete block 3 to be described later) from a concrete structure (for example, reinforced concrete wall 2 to be described later). A method for cutting out a concrete block, in which holes are drilled at four rectangular locations on the surface of the concrete structure to form four guide holes (for example, guide holes 5A, 5B, 5C, and 5D, which will be described later). In the guide hole forming step (for example, step S1 described below), adjacent ones of the four guide holes are used as cutting guide holes (for example, cutting guide holes 30 and 31 described later), and the pair of cutting guide holes are A first wire guide unit of the cutting device (e.g., a first wire guide unit 11A described later), in which the wire is wound, is inserted into each of the guide holes, and a drive device of the cutting device (e.g., a drive device described later) is inserted into each of the guide holes. 12) to rotate the wire, repeating the work of cutting the concrete between the cutting guide holes with the wire (for example, the wire 10 described below), thereby cutting both sides of the concrete block, A first cutting step (for example, steps S2 and S3 described below) of cutting three of the top surface and the bottom surface (for example, both side surfaces 3A, 3B, and the top surface 3C described below), and both sides, the top surface, and One uncut surface of the lower surface is a final cut surface (for example, the lower surface 3E described below), two of the four guide holes adjacent to the final cut surface are cutting guide holes, and the pair of cutting guides Inserting a second wire guide unit of the cutting device (for example, a second wire guide unit 11B described later), in which the wire is passed around, into each of the holes, and passing the wire into the back of the remaining pair of guide holes. Then, by driving the drive device of the cutting device to rotate the wire, the wire cuts the concrete between the cutting guide holes, and cuts the concrete between the cutting guide holes (for example, the back surface 3D described below). ) (e.g., step S4 described below) and taking out the inserted second wire guide unit, the wire of the cutting device is routed deep into the pair of guide holes, and the next By driving the drive device of the cutting device to rotate the wire, the wire of the cutting device cuts the concrete between the cutting guide holes to cut the final cut surface of the concrete block. The method is characterized by comprising a third cutting step (for example, step S5 described below).

According to this invention, by simply providing four guide holes for inserting a wire guide unit into a concrete structure, these guide holes can be used as guide holes for cutting, and a substantially rectangular concrete block can be cut by a cutting device. Concrete blocks can be removed from concrete structures by cutting both sides, top, back, and bottom.

In the concrete block cutting method of the third invention, in the second cutting step of cutting the back side of the concrete block, when the wire is routed deep into the remaining pair of guide holes, each of the remaining pair of guide holes is cut out. It is characterized in that an auxiliary tool (for example, a guide block 32 and a rotational auxiliary tool 33, which will be described later) is attached to the back of the auxiliary tool, and a wire is routed around the auxiliary tool.

When cutting the back side of a concrete block, insert a wire guide unit into each of the pair of cutting guide holes, and also route the wire through the remaining pair of guide holes where no wire guide unit is inserted. Rotate and cut the back of the concrete block. At this time, there was a risk that the wire would get caught in the protruding corners inside the remaining pair of guide holes, making it impossible to perform the cutting operation smoothly.
Therefore, according to the present invention, an auxiliary tool is attached to the back of the remaining pair of guide holes in which the wire guide unit is not inserted, and the wire is also routed through these auxiliary tools, so that the wire can be attached to the protruding corner inside the guide hole. Prevents snagging and allows concrete cutting work to be carried out smoothly.

According to the present invention, it is possible to provide a cutting device that can cut out a concrete block in a short construction period by reducing the inner diameter of a guide hole, and a method of cutting out a concrete block using this cutting device.

1 is a diagram showing the configuration of a cutting device according to an embodiment of the present invention. It is a side view of the tip part of the 1st wire guide unit of the said cutting device. It is a side view of the tip part of the 2nd wire guide unit of the said cutting device. 4 is a sectional view taken along line AA and taken along line BB of the wire guide unit shown in FIG. 3. FIG. It is a flowchart of the method of cutting out a concrete block using the cutting device. It is an explanatory view (part 1) of the method of cutting out the concrete block. It is an explanatory view (part 2) of the cutting method of the concrete block. It is an explanatory view (Part 3) of the cutting method of the concrete block. It is an explanatory view (part 4) of the cutting method of the concrete block. It is an explanatory view (part 5) of the method of cutting out the concrete block. It is an explanatory view (part 6) of the cutting method of the concrete block. It is an explanatory view (part 7) of the cutting method of the concrete block. FIG. 8 is an explanatory diagram (No. 8) of the method of cutting out the concrete block. FIG. 9 is an explanatory diagram (No. 9) of the method for cutting out the concrete block. It is an explanatory view of the cutting method of the concrete block concerning the modification of the present invention.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
The present invention is a cutting device 1 used for cutting out a concrete block 3, and a method of cutting out a substantially rectangular parallelepiped-shaped concrete block 3 from a reinforced concrete wall 2 as a concrete structure using this cutting device 1 (see Fig. 5). a)).
FIG. 1 is a diagram showing the configuration of a cutting device 1. As shown in FIG.
The cutting device 1 is for cutting a reinforced concrete wall 2. This cutting device 1 includes an annular wire 10 embedded with diamond abrasive grains, a pair of first wire guide units 11A or second wire guide units 11B that guide the wire 10, and rotates the wire 10 in one direction. This is a waterless wire saw that is equipped with a drive device 12 and does not use water to cool the wire 10.

FIG. 2 is a side view of the distal end portion of the first wire guide unit 11A.
This first wire guide unit 11A is inserted into cutting guide holes 30 and 31, which will be described later.
The wire guide unit 11A includes a square tube-shaped support beam 20 extending in a predetermined direction, a support part 21 that maintains the attitude of the support beam 20 with respect to the cutting guide hole 31, and a fixing part 22 fixed to the tip of the support beam 20. and a first guide pulley 23 rotatably provided on the fixed part 22 and around which the wire 10 is wound.
The support portion 21 extends radially outward from the outer peripheral surface of the support beam 20, and by being stretched against the inner surfaces of the cutting guide holes 30, 31, the support portion 21 changes the attitude of the support beam 20 with respect to the cutting guide holes 30, 31. Hold.
The first guide pulley 23 changes the direction of movement of the wire 10 by approximately 90°. The rotation axis P of this first guide pulley 23 is on the central axis C of the support beam 20 and intersects with the central axis C.

FIG. 3 is a side view of the distal end portion of the second wire guide unit 11B. 4(a) is a sectional view taken along the line AA of the second wire guide unit 11B in FIG. 3, and FIG. 4(b) is a sectional view taken along the line BB of the second wire guide unit 11B shown in FIG.
This second wire guide unit 11B is inserted into cutting guide holes 30 and 31, which will be described later.
The second wire guide unit 11B includes a cylindrical support beam 20 that extends in a predetermined direction and into which the wire 10 is inserted, a support section 21 that maintains the attitude of the support beam 20 with respect to the cutting guide hole 31, and a support beam a first guide pulley 23 that is rotatably provided on the rotary portion 24 and around which the wire 10 is routed; A second guide pulley 25 that guides the wire 10 passing inside to the first guide pulley 23, and a pair of third guide pulleys 26 that are provided on the rotating part 24 and guide the wire 10 extending from the first guide pulley 23. Be prepared.

The wire 10 is arranged on the central axis C of the support beam 20.
The support portion 21 extends radially outward from the outer peripheral surface of the support beam 20, and by being stretched against the inner surfaces of the cutting guide holes 30, 31, the support portion 21 changes the attitude of the support beam 20 with respect to the cutting guide holes 30, 31. Hold.
The rotation axis Q of the rotating part 24 is on the central axis C of the support beam 20.
The first guide pulley 23 changes the direction of movement of the wire 10 by approximately 90°. The rotation axis P of this first guide pulley 23 is on the central axis C of the support beam 20 and intersects with the central axis C.
The second guide pulley 25 guides the wire 10 passing on the central axis C of the support beam 20 to the first guide pulley 23. The rotation axis R of this second guide pulley 25 intersects with the central axis C of the support beam 20. Further, the second guide pulley 25 is arranged such that the groove on which the wire 10 is hung is located on the central axis C of the support beam 20.
The third guide pulley 26 prevents the wire 10 passing through the first guide pulley 23 from coming off the groove of the first guide pulley 23. The rotation axis S of this third guide pulley 26 is approximately parallel to the central axis C of the support beam 20. Further, the third guide pulley 26 is arranged at a position to sandwich the wire 10 that has passed through the first guide pulley 23 from both sides.

Hereinafter, a method for cutting out a concrete block 3 from a reinforced concrete wall 2 using the cutting device 1 will be described with reference to the flowchart of FIG. 5.
Specifically, as shown in FIG. 6(a), the concrete block 3 includes side surfaces 3A, 3B, a top surface 3C, a back surface 3D, and a bottom surface 3E.
In step S1, as shown in FIG. 6(b), four rectangular locations on the surface 4 of the reinforced concrete wall 2 are marked and drilled to form four guide holes 5A, 5B, 5C, and 5D.

In step S2, the sides 3A and 3B of the concrete block 3 are cut. Specifically, as shown in FIG. 7(a), the vertically adjacent guide holes 5A and 5D are used as cutting guide holes 30 and 31, and the wire 10 is hung in each of these cutting guide holes 30 and 31. Insert the rotated first wire guide unit 11A. In addition, in FIGS. 7 to 14, in order to facilitate understanding, the wire guide units 11A and 11B are not shown in their entirety, but only the first guide pulley 23 is shown.
In this state, by driving the drive device 12 to rotate the wire 10, the wire 10 cuts the concrete between the cutting guide holes 30 and 31, as shown in FIG. 7(b). As shown in 8(a), the side surface 3A of the concrete block 3 is cut.

Similarly, as shown in FIG. 8(b), the vertically adjacent guide holes 5B and 5C were used as cutting guide holes 30 and 31, and the wire 10 was passed through each of these cutting guide holes 30 and 31. Insert the first wire guide unit 11A. In this state, by driving the drive device 12 to rotate the wire 10, the wire 10 cuts the concrete between the cutting guide holes 30 and 31, as shown in FIG. As shown in 9(b), the side surface 3B of the concrete block 3 is cut.

In step S3, the upper surface 3C of the concrete block 3 is cut. Specifically, as shown in FIG. 10(a), the upper two adjacent guide holes 5C and 5D are used as cutting guide holes 30 and 31, and the wire 10 is inserted into each of these cutting guide holes 30 and 31. Insert the first wire guide unit 11A with the wire wrapped around it. In this state, by driving the drive device 12 to rotate the wire 10, the wire 10 cuts the concrete between the cutting guide holes 30 and 31, as shown in FIG. 10(b). As shown in 11(a), the upper surface 3C of the concrete block 3 is cut.

In step S4, since cutting of the side surfaces 3A, 3B and top surface 3C of the concrete block has been completed, the back surface 3D of the concrete block 3 is cut. Specifically, as shown in FIG. 11(b), the two adjacent guide holes 5A and 5B on the lower side are used as cutting guide holes 30 and 31, and a wire is inserted into each of these cutting guide holes 30 and 31. 10 is inserted. Further, guide blocks 32 as auxiliary tools are attached to the inner parts of the two upper adjacent guide holes 5C and 5D, and the wire 10 is also passed through these guide blocks 32. As shown in FIG. 12(a), the guide block 32 includes a fitting surface 32A that fits into the inner surfaces of the cutting guide holes 30 and 31, and a guide surface 32B that guides the wire 10. .
In this state, by driving the drive device 12 to rotate the wire 10, the wire 10 cuts the concrete as shown in FIG. 12(b). At this time, the angle of the wire 10 changes as the cutting of the concrete progresses, but the first guide pulley 23 follows the change in the angle of the wire 10 by rotating the rotating part 24. Thereby, as shown in FIG. 13(a), the back surface 3D of the concrete block 3 is cut.

In step S5, since cutting of the side surfaces 3A, 3B, top surface 3C, and back surface 3D of the concrete block has been completed, the remaining bottom surface 3E is cut. Specifically, first, the second wire guide unit 11B inserted into the cutting guide holes 30 and 31 is taken out. Thereby, as shown in FIG. 13(b), the wire 10 is routed deep into the two lower adjacent guide holes 5A and 5B. In this state, by driving the drive device 12 to rotate the wire 10, the wire 10 cuts the concrete between the cutting guide holes 30 and 31, as shown in FIG. 14(a). 14(b), the lower surface 3E of the concrete block 3 is cut.
In step S6, the concrete block 3 is taken out from the reinforced concrete wall 2.

According to this embodiment, there are the following effects.
(1) The cutting device 1 was configured to include an annular wire 10, a pair of wire guide units 11A and 11B, and a drive device 12. Therefore, a pair of cutting guide holes 30 and 31 are formed in the reinforced concrete wall 2, and the wire guide units 11A and 11B are inserted into each of the pair of cutting guide holes 30 and 31, and in this state, the drive device 12 By rotating the wire 10, the wire 10 can cut the concrete between the cutting guide holes 30 and 31.
At this time, since the support part 21 was provided around the support beam 20 of the wire guide units 11A and 11B, this support part 21 is stretched inside the cutting guide holes 30 and 31, and the support beam 20 is held in a stable posture. be done.
Furthermore, since the rotation axis P of the first guide pulley 23 is arranged on the central axis C of the support beam 20, the inner diameter of the cutting guide holes 30 and 31 only needs to be slightly larger than the outer diameter of the first guide pulley 23. Therefore, the inner diameter of the cutting guide holes 30, 31 can be made smaller than in the past, and work efficiency can be improved.
In addition, regarding the second wire guide unit 11B, the first guide pulley 23 is provided on the rotating part 24, and this rotating part 24 is made rotatable on the support beam 20, so that the angle of the wire 10 changes as concrete cutting progresses. Even if the angle of the wire 10 changes, the rotating part 24 rotates to smoothly follow the change in the angle of the wire 10.

(2) By simply providing four guide holes 5A to 5D for inserting the wire guide units 11A and 11B in the reinforced concrete wall 2, both sides 3A and 3B, the top surface 3C, and the back surface 3D of the approximately rectangular parallelepiped-shaped concrete block 3, The concrete block 3 can be taken out from the reinforced concrete wall 2 by cutting the lower surface 3E.
(3) When cutting the back surface 3D of the concrete block 3, attach the guide block 32 to the back of the upper guide holes 5C and 5D, and by passing the wire 10 around these guide blocks 32, the wire 10 can be inserted into the guide hole 5C. , the concrete can be cut smoothly by preventing it from getting caught in the protruding corners inside the 5D.

Note that the present invention is not limited to the above-described embodiments, and any modifications, improvements, etc. that can achieve the purpose of the present invention are included in the present invention.
For example, in the above-described embodiment, the guide block 32 is used as the auxiliary tool in step S4, but the present invention is not limited to this, and a rotation auxiliary tool 33 as shown in FIG. 15 may be used. The rotation assisting tool 33 includes a support portion 331 that fits into the inner surfaces of the cutting guide holes 30 and 31, and a guide roller 332 that is rotatably supported by the support portion 331 and around which the wire 10 is wound. .
Further, in the present embodiment, in steps S2 to S3, the concrete block 3 is cut in the order of the side surface 3A, side surface 3B, top surface 3C, back surface 3D, and bottom surface 3E, but the present invention is not limited to this. That is, in order to cut the back surface 3D, it is sufficient to cut any three of the side surfaces 3A, the side surfaces 3B, the upper surface 3C, and the lower surface 3E, and the cutting order of the three surfaces may also be arbitrarily determined. Therefore, for example, the side surface 3A, side surface 3B, and bottom surface 3E of the concrete block 3 may be cut in any order, then the back surface 3D may be cut, and finally the top surface 3C may be cut.

1... Cutting device 2... Reinforced concrete wall (concrete structure)
3...Concrete block 3A, 3B...Side surface 3C...Top surface 3D...Back surface 3E...Bottom surface 4...Surface of reinforced concrete wall 5A, 5B, 5C, 5D...Guide hole 10...Wire 11A...First wire guide unit 11B...Second wire guide Unit 12... Drive device 20... Support beam C... Central axis of support beam 21... Support part 22... Fixed part 23... First guide pulley P... Rotating shaft of first guide pulley 24... Rotating part Q... Rotating shaft of rotating part 25...Second guide pulley R...Rotation shaft of the second guide pulley 26...Third guide pulley S...Rotation shaft of the third guide pulley 30, 31...Guide hole for cutting 32...Guide block (auxiliary tool) 32A...Fitting Surface 32B...Guide surface 33...Rotation aid 331...Support part 332...Guide roller

Claims (3)

A cutting device for cutting concrete,
A ring-shaped wire embedded with diamond abrasive grains, a pair of first wire guide units and a pair of second wire guide units that guide the wire, and a drive device that rotates the wire,
Each of the pair of first wire guide units includes a support beam extending in a predetermined direction;
a support portion extending radially outward from the outer peripheral surface of the support beam;
a fixed part fixed to the tip of the support beam;
a first guide pulley that is provided on the fixed part and is rotatable with a rotation axis on the central axis of the support beam and in a direction that intersects with the central axis, and around which a wire is passed ;
The pair of second wire guide units each include a support beam extending in a predetermined direction;
a support portion extending radially outward from the outer peripheral surface of the support beam;
a rotating part that is provided at the tip of the support beam and is rotatable about the extending direction of the support beam as a rotation axis, and into which a wire is inserted ;
a first guide pulley that is provided in the rotating part and is rotatable on the rotation axis of the rotating part and with a rotation axis in a direction that intersects with the rotation axis of the rotating part , and around which a wire is passed ;
a second guide pulley that is provided in the rotating section and guides a wire passing through the rotating section to the first guide pulley;
A cutting device comprising: a pair of third guide pulleys that are provided on the rotating part and guide a wire extending from the first guide pulley . A concrete block cutting method for cutting a substantially rectangular parallelepiped-shaped concrete block from a concrete structure using the cutting device according to claim 1,
a guide hole forming step of drilling holes at four rectangular locations on the surface of the concrete structure to form four guide holes;
Adjacent ones of the four guide holes are used as cutting guide holes, and the first wire guide unit of the cutting device, in which the wire is passed around, is inserted into each of the pair of cutting guide holes, and the first wire guide unit of the cutting device is inserted into each of the pair of cutting guide holes. By driving the drive device of the device to rotate the wire, the wire repeatedly cuts the concrete between the cutting guide holes, thereby cutting both sides, the top surface, and the bottom surface of the concrete block. a first cutting step of cutting three sides;
One of the uncut sides, top surface, and bottom surface of the concrete block is the final cutting surface, and two of the four guide holes adjacent to the final cutting surface are the cutting guide holes, and the pair of cutting Insert the second wire guide unit of the cutting device in which the wire is threaded into each of the guide holes, and drive the drive device of the cutting device by threading the wire into the back of the remaining pair of guide holes. a second cutting step of cutting the concrete between the cutting guide holes with the wire by rotating the wire to cut the back surface of the concrete block;
By taking out the inserted second wire guide unit, the wire of the cutting device is routed deep into the pair of guide holes, and then the driving device of the cutting device is driven to rotate the wire. and a third cutting step of cutting the concrete between the cutting guide holes with the wire of the cutting device to cut the final cut surface of the concrete block. Method. In the second cutting step of cutting the back surface of the concrete block, when the wire is routed through the remaining pair of guide holes, an auxiliary tool is attached to the back of each of the remaining pair of guide holes, and the auxiliary tool is attached to the back of each of the remaining pair of guide holes. 3. The method for cutting out a concrete block according to claim 2, wherein a wire is passed around the concrete block.

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