JP2022057077A - Structure cutting method and cutting device - Google Patents

Abstract

To provide a structure cutting method and cutting device capable of adjusting the tension applied to the overall wire during wire cutting work and realizing a good cutting operation.SOLUTION: A cutting device 1 includes: a wire 10; a wire drive mechanism; and guide means for guiding the wire. A structure cutting method for cutting a structure with the wire involves cutting the structure while moving the guide means in a direction to relieve the loosening or tension of the wire during cutting of the structure with the wire.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cutting method for cutting a structure using a cutting device provided with a wire such as an endless annular diamond wire in which beads in which diamond abrasive grains are embedded are mounted at regular intervals.

Conventionally, for example, in the construction of renewing a concrete deck (hereinafter referred to as a deck) as a structure of a bridge, the existing girder is reused, so that the old deck attached to the upper surface of the girder is cut. It is removed and the new deck is joined to the girder.
In the demolition work when renewing the deck of the bridge, the part near the boundary between the deck attached to the upper surface of the girder and the upper surface of the girder is cut using a cutting device equipped with a wire such as a diamond wire. The cutting method (wire saw method) is known.
For example, a method of installing the cutting device on the lower surface side of the floor slab and cutting (see Patent Document 1) is known.

Japanese Unexamined Patent Publication No. 2018-145668

In the cutting method using the cutting device of Patent Document 1, the cutting position of the structure by the wire is far from the position of the pulley which is the fulcrum of the wire at the time of cutting the wire, the length of the wire is long, and the wire is Due to factors such as the large number of pulleys to be hung, the good tension required for the entire wire is not maintained during cutting, and the tension applied to the wire becomes unstable, resulting in unstable cutting operation. It sometimes became. For example, the wire may loosen (slack) during cutting, resulting in a wavy cut surface.
It is an object of the present invention to provide a structure cutting method and a cutting device capable of adjusting the tension applied to the entire wire during wire cutting work to realize a good cutting operation. ..

The method for cutting a structure according to the present invention is a method for cutting a structure by using a wire, a cutting device having a wire, a drive mechanism for the wire, and a guide means for guiding the wire. The feature is to cut the structure while moving the guide means in the direction of relaxing or relieving the tension of the wire during the cutting of the structure by the wire, so that the tension applied to the entire wire during the cutting work of the wire can be adjusted. , It has become possible to realize a good cutting operation. In addition, since it has become possible to realize a good cutting operation, it has become possible to shorten the work time related to the cutting work.
Further, the cutting device according to the present invention is a cutting device including a wire, a wire driving mechanism, and a guide means for guiding the wire, and the guide means is used to loosen or tension the wire during cutting of a structure by the wire. It is characterized by being equipped with a power applying means for moving in the direction of elimination.
Further, the guide means is a pulley attached so as to be movable on the guide rail, and the power applying means is an actuator for moving the pulley along the guide rail.
Further, the guide means is a regulating member that regulates the downward movement of the pulley attached so as to be movable on the guide rail and the wire hung on the pulley, and the power applying means is a guide rail for the pulley and the regulating member. It is characterized by being an actuator that moves along the rail.
Further, the power applying means is characterized in that one end is attached to a fixed portion and the other end is a cylinder attached to a support portion of a pulley or a support portion of a pulley and a downward movement restricting member.
According to the cutting device according to the present invention, it is possible to provide a cutting device capable of adjusting the tension applied to the entire wire at the time of cutting the wire, realizing a good cutting operation, and shortening the working time related to the cutting work. became.

Top view of the cutting device attached to the underside of the deck. The figure which shows the state seen from the A direction of FIG. The figure which shows the arrangement example of the pulley when viewed from the B direction of FIG. The perspective view which shows the wire tension adjustment mechanism.

The structure cutting method and the cutting device according to the embodiment will be described with reference to FIGS. 1 to 4.
FIG. 1 is a plan view of the cutting device attached to the lower surface of the deck in the dismantling work when updating the deck of the bridge, but is a plan view of the deck 3 other than the cutting target portion 3A and the girder 2. The illustration of the part is omitted. FIG. 2 is a cross-sectional view showing the relationship between the deck and the cutting device when viewed from the direction A of FIG. FIG. 3 is a diagram showing the arrangement of each pulley constituting the pulley group when viewed from the direction B of FIG. 1. FIG. 4 is a perspective view showing a wire tension adjusting mechanism configured by combining a guide rail, a guide means, and a power applying means.
In the present specification, the width direction is indicated by "W" in each figure, the cutting direction is indicated by "S" in each figure, and the vertical direction is indicated by "V" in each figure. It is defined as a direction and explained.

As a method for cutting a structure according to an embodiment, for example, in a demolition work when renewing a deck of a bridge, as shown in FIG. 2, a girder using a cutting device (wire saw) 1 provided with a wire 10 is used. This is a method (wire saw method) for cutting a cut target portion 3A of the floor slab 3 in the vicinity of the boundary between the floor slab 3 made of reinforced concrete as a structure attached to the upper surface 2t of 2 and the upper surface 2t of the girder 2.
In this case, for example, the wire 10 is driven in a state where the cutting device 1 is attached to the lower surface 3u of the deck 3 and the cutting device 1 is supported by the deck 3, and the boundary with the upper surface 2t of the girder 2 in the deck 3 is driven. By cutting the cutting target site 3A, which is a nearby part, the possibility of damaging the girder 2 to be reused without impairing the use around the deck, that is, the use of the road, is low in the deck renewal work. can.
The cutting target portion 3A is, for example, the upper surface of the girder 2 in the haunch (tapered) portion of the deck 3 formed on the inclined lower surface 3ut that is inclined upward from both ends of the width direction W of the upper surface 2t of the girder 2. It is a portion near the boundary with 2t.
Further, the lower surface 3u of the deck 3 is a lower surface other than the inclined lower surface 3ut of the haunch portion.

The cutting device 1 provides power to move the wire 10, the guide means of the wire 10, the drive device of the wire 10, and the guide means in the direction of relieving the relaxation or tension of the wire during the cutting of the deck 3 by the wire 10. Provide means.

The wire 10 is formed of, for example, an endless annular diamond wire in which beads in which diamond abrasive grains are embedded are mounted at regular intervals, and the endless annular wire 10 is hung on a plurality of pulleys to perform circulation movement. , The floor slab 3 is configured to be in contact with the cutting target portion 3A so that the cutting target portion 3A can be cut.

In the cutting device 1 according to the embodiment, as shown in FIG. 1, between the pulley 20 on one side and the pulley 20 on the other side, which are arranged on the left and right sides of the width direction W of the cutting target portion 3A and serve as fulcrums at the time of cutting. The configuration in which the portion of the wire 10 of the above is moved in the cutting direction S and the wire 10 is pushed into the cutting target portion 3A to cut the cutting target portion 3A is illustrated.

That is, as shown in FIGS. 1 and 2, for example, the cutting device 1 is along the extension direction of the girder 2 on the lower surface 3u side of the deck 3 on both the left and right sides of the width direction W of the cut target portion 3A of the deck 3. The left and right guide rails 30 and 30 are arranged so as to extend and face the girder 2 in parallel.
Then, the pulleys 20 and 20 (hereinafter referred to as fulcrum pulleys) that serve as fulcrums when the wire 10 is pushed into the cutting target portion 3A, and the regulation that regulates the downward movement of the wire 10 hung on the fulcrum pulleys 20 and 20. For example, the rollers 40 and 40 as members are attached to the left and right guide rails 30 and 30, respectively, so as to be movable along the guide rails 30 and 30.
Further, it is provided with, for example, hydraulic cylinders 50, 50 as power applying means for moving the fulcrum pulleys 20, 20 and rollers 40, 40 in a direction for relieving the relaxation or tension of the wire 10 while the floor slab 3 is being cut by the wire 10. ing.

That is, the cutting device 1 moves the support pulley 20 and the roller 40 as the guide means attached to the guide rail 30 so as to be movable, and the support pulley 20 and the roller 40 as the guide means along the guide rail. The floor slab 3 is provided with a hydraulic cylinder 50 as a power applying means, and a wire tension adjusting mechanism 5 for adjusting the tension of the wire 10 in order to release the loosening or tension of the wire 10 while the floor slab 3 is being cut by the wire 10. It was configured to be provided on both the left and right sides of the width direction W of the cutting target portion 3A.

That is, the wire tension adjusting mechanism 5 has a fulcrum pulley 20 and a fulcrum pulley 20 on a guide rail 30 whose both ends are fixed to the lower surface 3u of the deck 3 by anchor bolts 39 (see FIG. 2) driven into the mounting member 41 and the floor plate 3. The roller 40 is attached so as to be movable along the guide rail 30, and further, a hydraulic cylinder 50 for moving the fulcrum pulley 20 and the roller 40 along the guide rail 30 is provided.

More specifically, the wire tension adjusting mechanism 5 is configured as shown in FIG. 4, for example.
First, two tubular sliders 11 and 12 that are attached so as to surround the outer circumference of the guide rail 30 and are movable along the guide rail 30 are provided.
Then, the pulley center shaft 20b to which the pulley 20a of the fulcrum pulley 20 is rotatably attached is attached to one slider 11 via the attachment plate 13.
Further, one end of the roller central shaft 40b to which the roller 40a of the roller 40 is rotatably attached is attached to one slider 11 via the mounting plate 14, and the other end of the roller central shaft 40b is attached via the mounting plate 15. Is attached to the other slider 12. One end of the roller central shaft 40b can be rotatably attached to the bearing hole 14a provided in the mounting plate 14, and the other end of the roller central shaft 40b can be rotatably attached to the bearing hole 15a provided in the mounting plate 15. It may be an attached configuration.
Further, one end side of the hydraulic cylinder 50, for example, the tip end side 51a of the piston rod 51 is attached to one slider 11 via the mounting plate 16, and the other end side of the hydraulic cylinder 50, for example, the cylinder tube 52. The bottom end side 52a is attached to the guide rail 30 as a fixing portion via the mounting plate 17.

According to the wire tension adjusting mechanism 5, the fulcrum pulley 20 and the roller 40 move in the cutting direction S by extending the piston rod 51, and the fulcrum pulley 20 and the roller 40 are retracted by retracting the piston rod 51. It can be returned to the side opposite to the cutting direction S.

Therefore, when the driving device of the wire 10 is activated and the wire 10 is driven to cut the cutting target portion 3A of the deck 3, the operator of the cutting device 1, other field workers, and the like Good cutting by, for example, operating the hydraulic cylinder 50 of the wire tension adjusting mechanism 5 to maintain the tension of the wire 10 as constant as possible while monitoring the cutting condition so that the wire 10 does not loosen. The operation can be realized.

The drive device for the wire 10 may have a tension adjusting function for adjusting the tension of the wire 10 by controlling the positions of the drive pulley and the driven pulley, which will be described later, for example. As described above. Due to various factors such as the cutting position of the structure by the wire 10 is far from the positions of the fulcrum pulleys 20 and 20, the length of the wire 10 is long, and the number of pulleys on which the wire 10 is hung is large. For example, slack is likely to occur in the wire 10 only by the tension adjusting function by the drive device of the wire 10, and the slack cannot be eliminated immediately.
Therefore, in the cutting device 1 according to the embodiment, by providing the wire tension adjusting mechanism 5, for example, the hydraulic cylinder 50 is operated so that the wire 10 does not loosen, and the tension of the entire wire 10 is sequentially applied. Since the tension can be adjusted and the tension of the entire wire 10 can be maintained constant, a good cutting operation by the wire 10 can be realized.
Further, in the cutting device 1 according to the embodiment, since a good cutting operation by the wire 10 can be realized, the work time related to the cutting work can be shortened.

Further, according to the cutting device 1 according to the embodiment, since the wire tension adjusting mechanism 5 is provided, a good cutting operation can be realized even when the driving device of the wire 10 does not have the tension adjusting function. ..

Hereinafter, an example of the guide means, the drive device, and the mounting plate 14 will be described.

As the pulley group constituting the guide means, the horizontal array pulley group that guides the wire 10 on the horizontal plane, the vertical array pulley group that guides the wire 10 on the vertical plane, and the wire 10 from the horizontal plane to the vertical plane. It is provided with a group of vertical-horizontal conversion pulleys that guide from above or on a vertical plane to a horizontal plane.

As shown in FIG. 1, for example, the horizontally arranged pulley group is composed of the above-mentioned two fulcrum pulleys 20 and 20 and the corner pulley 21 which serve as fulcrums at the time of cutting.

As shown in FIG. 3, for example, the vertical arrangement pulley group includes a drive pulley 22 and a plurality of driven pulleys 23, 24, 25, 26, 27 for changing directions.

The vertical-horizontal conversion pulley group includes a variable pulley 28 configured to be able to change the direction when the wire 10 is guided to the horizontal plane, and a fixed pulley 29 whose direction when the wire 10 is guided to the horizontal plane is constant.

That is, the wire 10 is configured to be extended from one fulcrum pulley 20 to a variable pulley 28, a driven pulley 23, 24, 25, 26, a drive pulley 22, a driven pulley 23, a fixed pulley 29, and the other fulcrum pulley 20. Will be done.
Then, by rotating the drive pulley 22 by the drive device of the wire 10 and moving both or one of the drive pulley 22 and the driven pulley 25 in the vertical direction V, one fulcrum pulley 20 and the other fulcrum pulley are moved. The portion of the wire 10 between the wire 20 and the wire 10 is pushed into the cutting target portion 3A, and the cutting target portion 3A is cut.

As shown in FIG. 3, the drive pulley 22 is attached to the first vertical support 35 extending in the vertical direction so as to be able to reciprocate in the vertical direction. The first vertical support 35 is attached to the lower surface 3u of the deck 3 via, for example, the attachment member 35A provided at the upper end.
Further, the driven pulley 25 is attached to the second vertical support 36 extending in the vertical direction so as to be able to reciprocate in the vertical direction. The second vertical support 36 is attached to the lower surface 3u of the deck 3 via, for example, the attachment member 36A provided at the upper end.
Further, the driven pulley 24 is attached to the second vertical support 36 via a mounting member (not shown) so as to be positioned above the driven pulley 25.
Further, the driven pulleys 23, 26, and 27 are, for example, mounted at predetermined positions of the horizontal support 37 via mounting members (not shown in the drawing). The horizontal support 37 is connected to, for example, the first vertical support 35 and the second vertical support 36 via a connecting member (not shown).
Further, the variable pulley 28 and the fixed pulley 29 are attached to the horizontal support 37 via, for example, an attachment member (not shown).

The drive device of the wire 10 is a drive pulley control device 6 that rotates the drive pulley 22 and linearly reciprocates the drive pulley 22 in the vertical direction V, and a driven pulley (not shown) that linearly reciprocates the driven pulley 25 in the vertical direction V. It is configured with a pulley control device.
Although not shown, the drive pulley control device 6 is, for example, a pulley rotation motor as a rotation drive source connected to a central axis (not shown) of the drive pulley 22, and a bearing that rotatably supports the rotation center axis of the drive pulley 22. A linear movement mechanism for reciprocating the drive pulley 22 in the vertical direction V along the first vertical support 35 is provided.

The linear movement mechanism is, for example, a rack pinion mechanism composed of a rack 34 (see FIG. 2) provided on the first vertical support 35 side and an unexpected pinion provided on the drive pulley 22 side and meshing with the rack 34. A motor for moving a pulley (for example, a hydraulic motor) as a drive source for rotating the pinion, a control circuit for the motor for moving the pulley, and the like are provided.
That is, by rotating the pinion, the drive pulley 22 is configured to be able to reciprocate in the extension direction of the rack 34, that is, in the vertical direction V of the first vertical support 35.

The driven pulley control device includes a linear moving mechanism that reciprocates the driven pulley 25 in the vertical direction V along the second vertical support 36, and the linear moving mechanism is the same as the linear moving mechanism of the drive pulley control device 6. It is composed.

As shown in FIG. 4, the mounting member 41 includes, for example, a floor-side mounting member 43 that is mounted on the lower surface 3u of the floor slab 3 with anchor bolts 39 or the like, and a guide rail-side mounting member 44 that is mounted on the guide rail 30. Since the guide rail side mounting member 44 is mounted so as to be movable in the vertical direction with respect to the vertical extension plate 43b of the floor side mounting member 43, the vertical position height of the guide rail 30 can be adjusted and the wire. The structure is provided with a vertical position adjusting mechanism capable of adjusting the vertical position of the tension adjusting mechanism 5.
That is, the mounting member 41 has a configuration in which the guide rail 30 is fixed to the lower surface 3u of the floor slab 3 and is provided with a vertical position adjusting mechanism for adjusting the vertical position of the guide rail 30.

The floor-side mounting member 43 includes a fixing plate 43a fixed to the lower surface 3u of the floor slab 3 with an anchor bolt 39 or the like, and a vertical extension plate 43b extending downward from the plate surface of the fixing plate 43a orthogonal to the plate surface. A fall prevention plate 43c extending from the lower end of the vertical extension plate 43b in a direction orthogonal to the plate surface of the vertical extension plate 43b is provided.
The fixing plate 43a is formed with a through hole 43d through which the anchor bolt 39 is penetrated, and the upper and lower extension plates 43b are formed with an elongated hole 43e formed so as to extend in the extension direction of the upper and lower extension plates 43b. A through screw hole (not shown) into which a screw 47 for vertical adjustment is screwed is formed in.

The guide rail side mounting member 44 extends from one end of the connecting plate 44a connected to the guide rail 30 by welding or a connecting tool such as a bolt or a nut in a direction orthogonal to the plate surface of the connecting plate 44a. A vertical movement connecting plate 44b that is connected to the vertical extension plate 43b in a state where the plate surface and the plate surface of the vertical extension plate 43b are in contact with each other is provided. The vertically moving connecting plate 44b is formed with a through hole (not shown) through which the connecting bolt 45 penetrates.

The mounting member 41 has a plate surface of the vertical moving connecting plate 44b and a floor side mounting member so that the upper end of the vertical moving connecting plate 44b of the guide rail side mounting member 44 is located on the fixing plate 43a side of the floor side mounting member 43. The plate surface of the upper and lower extension plates 43b of 43 was brought into contact with each other, and the plate surface forming the lower surface of the connecting plate 44a of the guide rail side mounting member 44 and the plate surface forming the upper surface of the fall prevention plate 43c were opposed to each other. In this state, the connecting bolt 45 is passed through the through hole 44c of the vertically moving connecting plate 44b and the elongated hole 43e of the vertical extension plate 43b, and the nut 46 is fastened to the tip end side of the connecting bolt 45 protruding from the elongated hole 43e. The guide rail side mounting member 44 and the floor side mounting member 43 are connected.
Then, the screw 47 for vertical adjustment is passed through, for example, the screw hole of the double nuts 48 and 49 and the through screw hole of the fall prevention plate 43c, and the tip of the screw 47 is formed on the lower surface of the connecting plate 44a. The mounting member 41 is configured by contacting with.

Therefore, the guide rails 30 are fixed to the lower surface 3u of the deck 3 by anchor bolts 39 and the like, so that the fixing plates 43a and 43a of the mounting members 41 and 41 provided on both ends of the guide rail 30 are fixed to the deck 3u. It is fixed to 3 and the wire tension adjusting mechanism 5 is supported by the deck 3.
Then, with the mounting member 41 fixed to the floor slab 3, the nut 46 fastened to the tip side of the connecting bolt 45 is loosened, and the screw 47 for vertical adjustment is moved up and down to the connecting plate 44a. Since the vertical position of the connected guide rail 30 can be adjusted, the vertical position of the fulcrum pulley 20 can be adjusted, and the vertical position of the cutting position can be adjusted by the wire 10.

After the vertical position adjustment is completed, the vertical position of the fulcrum pulley 20 is fixed by fastening the nut 46 on the tip end side of the connecting bolt 45 and the double nuts 48 and 49.

According to the cutting device 1 and the cutting method using the cutting device 1 of the embodiment, the drive pulley 22 is rotated while the cutting device 1 is fixed to the lower surface 3u of the deck 3, and the drive pulley 22 and the driven pulley are used. By moving both or one of the 25 in the vertical direction V, the drive pulley 22 and the driven pulley 25 pull the wire 10 to pull the wire 10 between the one fulcrum pulley 20 and the other fulcrum pulley 20. Is pushed into the cutting target site 3A. Then, as the cutting operation by the wire 10 progresses, the wire 10 moves to the upper side of FIG. 1 as shown by the imaginary line of FIG. 1, and the cutting target portion 3A is cut.
Then, according to the cutting device 1 and the cutting method using the cutting device 1 of the embodiment, during the cutting work, the operator of the cutting device 1, other on-site workers, etc., while monitoring the cutting status, for example, By operating the hydraulic cylinder 50 of the wire tension adjusting mechanism 5 so that the tension of the wire 10 is maintained as constant as possible so that the wire 10 does not loosen, a good cutting operation can be realized.

Although the wire tension adjusting mechanism 5 described above includes a roller 40 as a restricting member for restricting the downward movement of the wire 10 hung on the fulcrum pulley 20, the restricting member does not necessarily have to be a roller. It suffices as long as it can regulate the downward movement of the wire 10 hung on the fulcrum pulley 20.

Further, the wire tension adjusting mechanism may be provided without a regulating member.

Further, the power applying means is not limited to the hydraulic cylinder 50, and a power cylinder such as a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or another actuator may be used.

Further, according to the cutting device 1 provided with the wire tension adjusting mechanism 5 of the present invention, when the wire 10 is in a state of being too tense during the cutting of the floor slab 3 by the wire 10, the guide means such as the fulcrum pulley 20 is used. It is also possible to perform the cutting work while moving the wire 10 in the direction of relieving the tension of the wire 10, and it becomes possible to realize a smooth and good cutting operation.

Further, in the embodiment, the configuration in which the cutting device 1 is attached to the lower surface 3u is illustrated, but the cutting device 1 may be attached to the inclined lower surface 3ut of the haunch portion of the deck 3. For example, the mounting member 41 may be mounted on the inclined lower surface 3ut of the haunch portion of the floor slab 3.

Further, the cutting device does not have to be configured to be attached to the lower surface 3u of the floor slab 3. For example, it may be a cutting device in which a dedicated support device (frame) is installed below the floor slab 3 and attached to the support device for cutting.
Further, the cutting device may be one in which the driving device of the wire 10 or the like is installed above the floor slab 3.

Further, in the embodiment, a method and an apparatus in which the operator of the cutting device 1 and other field workers operate the actuator (hydraulic cylinder 50) of the wire tension adjusting mechanism 5 while monitoring the cutting state are exemplified. The cutting device of the present invention includes a tension detecting means for detecting the tension of the wire 10 and a control means for controlling the actuator based on the tension value output from the tension detecting means, and is detected by the tension detecting means. The control means may be a cutting device having a function of performing feedback control of the actuator based on the output value from the tension detecting means so that the tension of the wire 10 is maintained at a preset tension value.

Further, in the embodiment, a method of cutting a floor slab as a concrete structure as a cutting target is exemplified, but the cutting target may be a structure such as a concrete structure or a steel structure other than the floor slab.
For example, the present invention can be applied to cutting structures such as road bridges, railway bridges, box culverts, and wall balustrades, and good cutting operations can be realized.

1 Cutting device, 3 Deck (structure), 10 Wire,
20 Support pulley (guide means), 40 rollers (guide means, regulatory member),
50 Hydraulic cylinder (powering means).

The method for cutting a structure according to the present invention is applied to a drive pulley, a driven pulley, one side pulley as a guide means as a fulcrum at the time of cutting, and the other side pulley as a guide means at the time of cutting. , An endless annular wire configured to be able to cut the part to be cut of the structure in contact by performing circulation movement, and the drive pulley is rotated, and either or both of the drive pulley and the driven pulley are rotated. It has a wire drive mechanism that moves and circulates the wire, and the wire drive mechanism rotates the drive pulley and moves both or one of the drive pulley and the driven pulley to circulate and move the wire. Thereby, in the method of cutting a structure using a cutting device for cutting a cutting target part of the structure in contact with the portion of the wire between the one-side pulley and the other-side pulley, the one-sided pulley is used as a guide means. A power applying means for moving the loosening or tension in the direction of the wire and a power applying means for moving the other side pulley as a guiding means in the direction of relaxing or releasing the tension of the wire are provided, and the one-side pulley and the other-side pulley are provided. While cutting the part to be cut of the structure at the part of the wire between and , the power applying means is operated to cut the structure while moving the guide means in the direction of relieving the relaxation or tension of the wire. As a feature, the tension applied to the entire wire during wire cutting work can be adjusted, and good cutting operation can be realized. In addition, since it has become possible to realize a good cutting operation, it has become possible to shorten the work time related to the cutting work.
Further, the cutting device according to the present invention is hung between a drive pulley, a driven pulley, one side pulley as a guide means as a fulcrum at the time of cutting, and the other side pulley as a guide means at the time of cutting. By performing circular movement, an endless annular wire configured to be able to cut the cutting target part of the structure in contact, and the drive pulley are rotated, and both the drive pulley and the driven pulley are moved. It is equipped with a wire drive mechanism for circulating and moving the wire, and the wire drive mechanism rotates the drive pulley and moves both or one of the drive pulley and the driven pulley to circulate and move the wire. , In a cutting device that cuts the part of the structure that comes into contact with the part of the wire between the one- side pulley and the other-side pulley, the structure is cut at the part of the wire between the one-side pulley and the other-side pulley. Cutting the target part of the structure with the power applying means for moving the one- sided pulley in the direction of releasing the loosening or tension of the wire while cutting the target part and the part of the wire between the one-sided pulley and the other-sided pulley. It is characterized by being provided with a power applying means for moving the other side pulley in a direction in which the wire is relaxed or the tension is released.
Further, the structure is a reinforced concrete floor slab, and the cut target portion is a portion of the floor slab near the boundary with the upper surface of the girder so as to extend along the extension direction of the girder and face the girder in parallel. The left and right guide rails are arranged, and one side pulley as a guide means is attached to one of the left and right guide rails so that it can move along the guide rail, and the one side pulley is wired. A cylinder is provided as a power applying means for moving the rail in a direction for relieving relaxation or tension, and the other side pulley as a guide means is attached to the other guide rail of the left and right guide rails so that the other side pulley can be moved to the guide rail. The other side of the pulley is provided with a cylinder as a power applying means for moving the pulley in a direction of releasing the loosening or tension of the wire .
In addition, it is equipped with two sliders that can be moved along the guide rail and a roller as a regulating member that regulates the downward movement of the wire hung on the pulley as a guide means, and the pulley as a guide means is one. One end of the roller as a regulating member is attached to one slider, the other end of the roller is attached to the other slider, one end side of the cylinder is attached to one slider, and The other end of the cylinder is attached to the guide rail .
According to the cutting device according to the present invention, it is possible to provide a cutting device capable of adjusting the tension applied to the entire wire at the time of cutting the wire, realizing a good cutting operation, and shortening the working time related to the cutting work. became.

That is, the cutting device 1 moves the fulcrum pulley 20 and the roller 40 as the guide means attached to the guide rail 30 so as to be movable, and the fulcrum pulley 20 and the roller 40 as the guide means along the guide rail. The deck 3 is provided with a hydraulic cylinder 50 as a power applying means, and a wire tension adjusting mechanism 5 for adjusting the tension of the wire 10 in order to release the loosening or tension of the wire 10 during cutting of the deck 3 by the wire 10. It was configured to be provided on both the left and right sides of the width direction W of the cutting target portion 3A.

1 Cutting device, 3 Deck (structure), 10 Wire,
20 fulcrum pulley (guide means), 40 rollers (guide means, regulatory member),
50 Hydraulic cylinder (powering means).

Claims (5)

In a method of cutting a structure by cutting a structure with a wire by using a cutting device having a wire, a drive mechanism of the wire, and a guide means for guiding the wire.
A method for cutting a structure, which comprises moving the guide means in a direction for relieving the relaxation or tension of the wire during cutting of the structure by the wire. In a cutting device provided with a wire, a wire drive mechanism, and a guide means for guiding the wire.
A cutting device comprising a power applying means for moving a guide means in a direction for relieving the relaxation or tension of the wire during cutting of a structure by a wire. The guide means is a pulley attached to the guide rail so that it can be moved.
The cutting device according to claim 2, wherein the power applying means is an actuator that moves the pulley along the guide rail. The guide means is a regulating member that regulates the downward movement of the pulley attached so as to be movable on the guide rail and the wire hung on the pulley.
The cutting device according to claim 2, wherein the power applying means is an actuator that moves the pulley and the regulating member along the guide rail. 3. The cutting device described.

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