Cutting device

Abstract

To provide a cutting device capable of suppressing the slack of a wire saw and suppressing the deviation of a cutting position.SOLUTION: A cutting device comprises: a cutting part 3 cutting a concrete floor slab 22 (concrete member); and a movement part 4 moving the cutting part 3. The cutting part 3 comprises: an endless loop-shaped wire saw 31 cutting the concrete floor slab 22; and two (plural) driving pulleys 32, 33 wound with the wire saw 31 and rotating the wire saw 31, and the two driving pulleys 32, 33 rotate so as to be synchronized at the same rotation frequency each other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cutting device.

Background Art

[0002] In a composite girder in which a steel girder and a concrete floor slab are joined and integrated with an anti-slip structure, when replacing the concrete floor slab of the composite girder, the concrete floor slab may be cut parallel to the steel girder with a cutting device equipped with a loop-shaped wire saw and removed (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When cutting a concrete floor slab with a wire saw, if the wire saw becomes slack, the cutting position will wobble, which may damage the steel girder. Therefore, the cutting of the concrete floor slab with a wire saw is performed at a position with a margin and at a distance from the steel girder, that is, at a position above the upper surface of the steel girder. And in the removal work of the concrete floor slab, after removing the upper part of the cutting position, the lower part thereof must be chopped off with a chipping hammer or a water jet and removed, so there is a problem that this chopping work takes time and labor.

[0005] Therefore, an object of the present invention is to provide a cutting device capable of suppressing the slack of a wire saw and suppressing the vibration of the cutting position.

Means for Solving the Problems

[0006] To achieve the above object, the cutting device according to the present invention includes a cutting part for cutting a concrete member, and the cutting part is Front-rear direction moved by a moving part. The cutting part includes an endless loop-shaped wire saw for cutting the concrete member, and a plurality of drive pulleys around which the wire saw is wound to rotate the wire saw. The plurality of drive pulleys rotate in synchronization with the same rotation speed, and the rotation axes of the plurality of drive pulleys The front-rear direction extend to The front-rear direction and are arranged at intervals in the horizontal direction intersecting with Vertical direction and include two drive pulleys around which the wire saw is wound on the upper side. An auxiliary pulley around which the wire saw moving between the two drive pulleys is wound is arranged at a position below the rotation axes of the two drive pulleys between the two drive pulleys, and the two drive pulleys are To move the concrete cutting portion for cutting the concrete member in the wire saw in the vertical direction moved by a Front-rear direction drive pulley moving part. The cutting part is moved to The vertical direction by the moving part, and at least one of moving the two drive pulleys to To cause while cutting the concrete member.

[0007] In the present invention, since the wire saw is wound around a plurality of drive pulleys, the wire saw is sent out by at least one of the plurality of drive pulleys and wound around other drive pulleys. Then, by rotating the plurality of drive pulleys in synchronization with the same rotation speed, the force for the drive pulley to send out the wire saw and the force for winding the wire saw are the same magnitude. Thereby, the slack of the wire saw can be suppressed, and the deviation at the cutting position can be suppressed. Further, in the cutting device according to the present invention, there is a drive pulley moving part for moving the two drive pulleys The front-rear direction to intersect with Horizontal direction . With such a configuration, the two drive pulleys Front-rear direction intersect with Horizontal directionMove it in this direction and move the wire saw in this direction as well, so that the concrete member can be Front-rear direction intersect with Horizontal direction and can also be cut.

[0008] Also, in the cutting device according to the present invention, the moving part may include a rail and a gantry that supports the cutting part and can travel on the rail.

[0009] With such a configuration, since the cutting part supported by the gantry can be moved along the rail, the deviation of the cutting position can be suppressed.

[0010] Also, in the cutting device according to the present invention, the moving part includes a plurality of traveling rollers attached to the gantry and traveling on the rail, and a motor for rotating each of the plurality of traveling rollers, and the plurality of traveling rollers may rotate in synchronization with the same rotation speed.

[0011] With such a configuration, since the gantry traveling on the rail does not shake, the deviation of the cutting position can be suppressed.

[0012] Also, in the cutting device according to the present invention, the rail may be installed on the concrete member.

[0013] With such a configuration, the rail can be easily installed. Since it is not necessary for the operator to enter under the concrete member to install the rail, the work can be carried out safely.

[0014] Also, in the cutting device according to the present invention, at least one of a safety protection sheet covering the cutting part and a curing sheet for preventing the scattering of dust and cutting treatment water during cutting may be provided on the gantry.

[0015] With such a configuration, since the safety protection sheet and the curing sheet move together with the gantry in accordance with the cutting location of the concrete member, it is not necessary to cover the entire concrete member with the safety protection sheet or the curing sheet, and the labor required for the installation and removal of the safety protection sheet and the curing sheet can be reduced.

[0016] Further, in the cutting device according to the present invention, a pair of freely rotatable pulleys are respectively provided on both sides of the cutting portion of the wire saw that cuts the concrete member, and the wire saw is wound around the pair of freely rotatable pulleys. The pair of freely rotatable pulleys may be able to adjust the position of the cutting portion with respect to the drive pulley in the moving direction of the cutting portion.

[0017] With such a configuration, the cutting portion of the wire saw can be disposed on the front side and the rear side in the moving direction of the cutting portion with respect to the drive pulley. Therefore, when the moving portion can move the cutting portion in the front-rear direction, if the cutting position of the wire saw is disposed at a position behind the moving direction of the drive pulley, the concrete member can be cut both when the cutting portion moves forward and when it moves backward. It can be done.

Advantages of the Invention

[0020] According to the present invention, the slack of the wire saw can be suppressed, and the deviation of the cutting position can be suppressed.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Best Mode for Carrying Out the Invention

[0022] (First Embodiment) Hereinafter, the cutting device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. As shown in FIG. 1, the cutting device 1 according to the first embodiment is used to cut the concrete floor slab 22 when removing the concrete floor slab 22 from the composite girder 2 in which the steel girder 21 and the concrete floor slab 22 (concrete member) are joined and integrated by the anti-slip 23. In FIG. 1, the range where the anti-slip is provided is indicated by reference numeral 23. Hereinafter, the direction in which the composite girder 2 extends is defined as the girder length direction (the direction of arrow A in the figure, which is perpendicular to the plane of the paper in FIG. 1). In the present embodiment, the girder length direction is a substantially horizontal direction. The horizontal direction perpendicular to the girder length direction is defined as the girder width direction (the direction of arrow B in the figure).

[0023] The concrete floor slab 22 is provided on the steel girder 21 extending in the girder length direction. The concrete floor slab 22 is formed in a long plate shape extending in the girder length direction. In the concrete floor slab 22, the portion directly above the steel girder 21 protrudes downward more than the portions on both sides in the girder width direction of that portion and is joined to the steel girder 21. The portion of the concrete floor slab 22 that protrudes downward and is joined to the steel girder 21 is defined as the steel girder joint portion 24. The anti-slip 23 is arranged at the steel girder joint portion 24. The upper side of the steel girder joint portion 24 in the concrete floor slab 22 is defined as the flat plate portion 25.

[0024] The cutting device 1 cuts the steel girder joint portion 24 together with the anti-slip 23 at a position above the upper surface of the steel girder 21. The anti-slip 23 has its lower end joined to the steel girder 21 and its upper end arranged above the cutting position 26 by the cutting device 1. The portion 27 of the concrete floor slab 22 below the cutting position 26 by the cutting device 1 is removed by chopping with a chipping hammer or a water jet.

[0025] The cutting device 1 has a cutting part 3 for cutting the concrete floor slab 22 and a moving part 4 for moving the cutting part 3. The cutting part 3 cuts the concrete floor slab 22 from the girder width direction at a position above the upper surface of the steel girder 21. The moving part 4 moves the cutting part 3 in the girder length direction. The cutting device 1 cuts the concrete floor slab 22 in the girder length direction by moving the cutting part 3, which cuts the concrete floor slab 22 from the girder width direction, in the girder length direction by the moving part 4.

[0026] As shown in FIGS. 1 to 3, the moving part 4 has a pair of rails 41, 41 installed on the concrete floor slab 22 to be cut, a gantry 42 for supporting the cutting part 3, a plurality of traveling rollers 43 provided on the gantry 42 and traveling on the rails 41, and a motor 44 (see FIGS. 2 and 3) connected to the traveling rollers 43. FIGS. 4 and 5 show the details of the gantry 42, the traveling rollers 43, and the motor 44.

[0027] The pair of rails 41, 41 are installed in a direction extending in the girder length direction. The pair of rails 41, 41 are anchor-fixed to the concrete floor slab 22. A hole 411 (see FIG. 3) through which an anchor is inserted is formed in each of the pair of rails 41, 41. The gantry 42 is movable in the girder length direction along the rails 41. Details of the gantry 42 will be described later.

[0028] As shown in FIGS. 1 and 2, the cutting part 3 has an endless loop-shaped wire saw 31 for cutting the concrete floor slab 22, two drive pulleys 32, 33 (a plurality of drive pulleys 32, 33) around which the wire saw 31 is wound to rotate the wire saw 31, and a plurality of auxiliary pulleys 34 for guiding the rotating wire saw 31. In FIG. 1, the wire saw 31 is shown by a dashed line. The two drive pulleys 32, 33 and the plurality of auxiliary pulleys 34 are each supported by the gantry 42.

[0029] The two drive pulleys 32 and 33 are respectively arranged above the gantry 42. That is, the two drive pulleys 32 and 33 are respectively arranged above the concrete floor slab 22. The two drive pulleys 32 and 33 have the same diameter, and their axes are arranged at intervals in the girder width direction with the axes extending in the girder length direction.

[0030] The wire saw 31 is arranged across the upper and lower sides of the concrete floor slab 22. The wire saw 31 is wound around the two drive pulleys 32 and 33 above the concrete floor slab 22, and extends downward through the concrete floor slab 22 or through the side of the concrete floor slab 22 from both sides in the girder width direction of the two drive pulleys 32 and 33, and extends in the girder width direction under the flat plate portion 25 of the concrete floor slab 22. The portion of the wire saw 31 that extends in the girder width direction under the flat plate portion 25 penetrates the steel girder joint portion 24 of the concrete floor slab 22 in the girder width direction. As the wire saw 31 moves in the girder length direction while rotating along its loop, the portion penetrating the steel girder joint portion 24 cuts the steel girder joint portion 24 in the girder length direction. The portion of the wire saw 31 that extends in the girder width direction under the flat plate portion 25 is defined as the wire saw cutting portion 311 (see FIG. 1).

[0031] The wire saw 31 rotated by the drive of the two drive pulleys 32 and 33 goes from one side to the other side in the girder width direction above the concrete floor slab 22, and goes from the other side to one side in the girder width direction under the concrete floor slab 22. The wire saw 31 goes from the upper side to the lower side on one side in the girder width direction, and goes from the lower side to the upper side on the other side in the girder width direction.

[0032] An auxiliary pulley 34 is provided at a portion for switching the feeding direction of the loop-shaped rotating wire saw 31. In this embodiment, free pulleys 35 and 35 are respectively provided on both sides in the girder width direction of the steel girder joint portion 24. The wire saw cutting portion 311 is provided between the two free pulleys 35 and 35 provided with the steel girder joint portion 24 therebetween.

[0033] 2, the swivel pulley 35 rotates about a first axis 351 passing through its center, and is supported so as to be rotatable 360° about a second axis 352 intersecting with the first axis 351. The swivel pulley 35 of this embodiment is oriented so that the second axis 352 extends in the vertical direction, and the first axis always extends in the horizontal direction.

[0034] The wire saw 31 extends in the vertical direction above the movable pulley 35, and extends in the horizontal direction below the movable pulley 35. Since the movable pulley 35 is supported so as to be rotatable 360° about the second axis, the portion of the wire saw 31 below the movable pulley 35, i.e., the wire saw cutting portion 311, can be oriented to extend in any direction along the horizontal plane.

[0035] Returning to FIG. 1, of the two drive pulleys 32, 33, the drive pulley 32 arranged on one side in the girder width direction is referred to as the first drive pulley 32, and the drive pulley 33 arranged on the other side in the girder width direction is referred to as the second drive pulley 33. The first drive pulley 32 and the second drive pulley 33 have the same shape and are controlled to have the same rotation speed and are synchronized. In this embodiment, the first drive pulley 32 and the second drive pulley 33 are connected to different motors (not shown). Each motor is connected to a different hydraulic unit. In this embodiment, the first drive pulley 32 and the second drive pulley 33 can be operated to be synchronized by one operation box.

[0036] As described above, above the concrete floor slab 22, the wire saw 31 moves from one side to the other side in the girder width direction. Specifically, the wire saw 31 is sent out to the first drive pulley 32 and moves downward, changes its direction at the auxiliary pulley 34 and moves toward the other side in the girder width direction, changes its direction at the auxiliary pulley 34 and moves upward to reach the second drive pulley 33. When the wire saw 31 reaches the second drive pulley 33, it is sent out to the second drive pulley 33, moves toward the lower side of the concrete floor slab 22, changes its direction at the auxiliary pulley 34, moves toward one side in the girder width direction, passes through the idle pulley 35, and cuts the steel girder joint 24. When the wire saw 31 cuts the steel girder joint 24 under the concrete floor slab 22 and reaches the first drive pulley 32 again after passing through the idle pulley 35, it is pulled back to the first drive pulley 32 so as to reach the first drive pulley 32.

[0037] As described above, the first drive pulley 32 and the second drive pulley 33 are controlled so that their respective rotation speeds are the same and they are synchronized. Thereby, the force with which the second drive pulley 33 sends out the wire saw 31 and the force with which the first drive pulley 32 pulls back the wire saw 31 become the same magnitude. As a result, the wire saw 31 is in a tensioned state and slack is suppressed.

[0038] As shown in FIGS. 1 and 3, the gantry 42 includes a first gantry 421, a second gantry 422, a connecting portion 423 that connects the first gantry 421 and the second gantry 422, and a drive pulley support portion 45 (see FIG. 1) that supports the first drive pulley 32 and the second drive pulley 33.

[0039] The first gantry 421 travels along one of the pair of rails 41, 41, and the second gantry 422 travels along the other rail 41. Travel rollers 43 are provided on each of the first gantry 421 and the second gantry 422. The travel roller 43 provided on the first gantry 421 and traveling along one rail 41 is referred to as a first travel roller 431, and the travel roller 43 provided on the second gantry 422 and traveling along the other rail 41 is referred to as a second travel roller 432.

[0040] The first traveling roller 431 and the second traveling roller 432 are each connected to a different motor 44. The first traveling roller 431 and the second traveling roller 432 are controlled to rotate in synchronization. In the present embodiment, it is possible to control the rotation of the first traveling roller 431 and the second traveling roller 432 to be synchronized with the rotation of the first drive pulley 32 and the second drive pulley 33.

[0041] The connecting portion 423 connects the first pedestal 421 and the second pedestal 422 in accordance with the interval between the pair of rails 41, 41. The connecting portion 423 may have an adjuster function for adjusting the interval between the first pedestal 421 and the second pedestal 422. Further, the first pedestal 421 and the second pedestal 422 may be configured to be connectable by each of a plurality of connecting portions 423 having different lengths. Thereby, the first pedestal 421 and the second pedestal 422 may be connected by the connecting portion 423 selected in accordance with the interval between the rails 41, 41.

[0042] The drive pulley support portion 45 includes a first pole 451 erected on the first pedestal 421, a second pole 452 erected on the second pedestal 422, a first drive pulley elevating portion 453 (drive pulley moving portion) to which the first drive pulley 32 is attached and which is movable in the vertical direction along the first pole 451, and a second drive pulley elevating portion 454 (drive pulley moving portion) to which the second drive pulley 33 is attached and which is movable in the vertical direction along the second pole 452.

[0043] The first drive pulley lifting part 453 and the second drive pulley lifting part 454 are arranged such that the first drive pulley 32 and the second drive pulley 33 are at the same height. As described above, the first drive pulley 32 and the second drive pulley 33 are installed with their axes extending in the girder length direction. When the first drive pulley lifting part 453 and the second drive pulley lifting part 454 move up and down, and the first drive pulley 32 and the second drive pulley 33 move up and down, the wire saw 31 wound around the first drive pulley 32 and the second drive pulley 33 moves up and down. When the wire saw 31 rises and the wire saw cutting part 311 for cutting the steel girder joint part 24 also moves up and down, it is possible to move the steel girder joint part 24 and the flat plate part 25 of the concrete floor slab 22 upward and cut them in the vertical direction. The lifting and lowering of the first drive pulley lifting part 453 and the second drive pulley lifting part 454 are performed, for example, by driving a hydraulic motor.

[0044] The gantry 42 is provided with a safety protection sheet 51 and a curing sheet 52 that cover the cutting part 3. The safety protection sheet 51 and the curing sheet 52 are fixed to the gantry 42, the first pole 451, the second pole 452, etc. of the drive pulley support part 45. The gantry 42 may be provided with a mounting member for mounting the safety protection sheet 51 and the curing sheet 52.

[0045] The gantry 42 may be provided with a dust collector for collecting dust generated when cutting the concrete floor slab 22 dry, a water injection means when cutting wet, etc. The dust collector and the water injection means are suspended and supported by the gantry 42 so that they can be arranged, for example, in the vicinity of the steel girder joint part 24 of the concrete floor slab 22.

[0046] Next, a method for removing the concrete floor slab 22 from the composite girder 2 will be described. A pair of rails 41, 41 are installed on the concrete floor slab 22. The gantry 42, two drive pulleys 32, 33, and an auxiliary pulley 34 are installed on the pair of rails 41, 41, and the wire saw 31 is installed. In the installation of the wire saw 31, a hole 241 extending in the girder width direction is formed in the steel girder joint 24 of the concrete floor slab 22. The wire saw 31 is passed through the hole 241 and wound around two driving pulleys 32 and 33. In this embodiment, the hole 241 is formed at least 2 cm above the upper surface of the steel girder 21. Note that the position where the hole 241 is formed may be set as appropriate.

[0047] The two driving pulleys 32 and 33 are rotated in synchronization, and the traveling rollers 43 are rotated in synchronization, causing the gantry 42 to travel in the girder length direction. When the gantry 42 moves from one side to the other side in the girder length direction, the wire saw cutting portion 311 also moves from one side to the other side in the girder length direction as if being pulled by the driving pulleys 32 and 33 of the gantry 42. At this time, the idle pulleys 35 provided on both sides of the wire saw cutting portion 311 rotate about the second axis so that the wire saw cutting portion 311 is on the rear side (one side in the girder length direction) of the idle pulley 35. On the contrary, when the gantry 42 moves from the other side to the one side in the girder length direction, the wire saw cutting portion 311 also moves from the other side to the one side in the girder length direction as if being pulled by the gantry 42. At this time, the idle pulley rotates about the second axis so that the wire saw cutting portion 311 is on the rear side (the other side in the girder length direction) of the idle pulley 35.

[0048] When the cutting portion 3 is moved to a predetermined position, the first driving pulley lifting portion 453 and the second driving pulley lifting portion 454 are used to lift the first driving pulley 32 and the second driving pulley 33, and the concrete floor slab 22 is cut upward by the wire saw cutting portion 311. When the wire saw 31 moves above the concrete floor slab 22, the cut concrete floor slab 22 is removed.

[0049] The remaining portion of the concrete floor slab 22, that is, the portion 27 below the cutting position 26 by the cutting device 1, is chiseled and removed using a chipping hammer, a water jet, or the like.

[0050] Next, the operation and effects of the cutting device 1 according to the first embodiment will be described. In the cutting device 1 according to the above embodiment, the wire saw 31 is wound around the first drive pulley 32 and the second drive pulley 33, so that the wire saw 31 is fed out by the second drive pulley 33 and wound around the first drive pulley 32. Then, the first drive pulley 32 and the second drive pulley 33 rotate in synchronization with each other at the same rotational speed, so that the force with which the second drive pulley 33 feeds out the wire saw 31 and the force with which the first drive pulley 32 winds up the wire saw 31 are of the same magnitude. Thereby, slack of the wire saw 31 can be suppressed, and blurring at the cutting position 26 can be suppressed. That is, the cutting accuracy is improved. As a result, since the cutting position 26 can be set closer to the steel girder 21, the portion 27 below the cutting position 26 is reduced, and the chiseling work on the portion 27 below the cutting position 26 can be reduced. In addition, since two drive pulleys 32, 33 are provided, the rotational speed can be increased, and the construction speed can be increased.

[0051] In the cutting device 1 according to the above embodiment, the moving part 4 includes a rail 41 and a gantry 42 that supports the cutting part 3 and is capable of traveling on the rail 41. With such a configuration, since the cutting part 3 supported by the gantry 42 can be moved along the rail 41, blurring at the cutting position 26 can be suppressed.

[0052] In the cutting device 1 according to the above embodiment, the moving part 4 includes a plurality of traveling rollers 43 attached to the gantry 42 and traveling on the rail 41, and a motor 44 that rotates each of the plurality of traveling rollers 43, and the plurality of traveling rollers 43 rotate in synchronization with each other at the same rotational speed. With such a configuration, since the gantry 42 traveling on the rail 41 does not blur, blurring at the cutting position 26 can be suppressed.

[0053] In the cutting device 1 according to the above embodiment, the rail is installed on the concrete floor slab 22. With such a configuration, the rail can be easily installed. Since it is not necessary for the worker to enter under the concrete floor slab 22 to install the rail, the work can be carried out safely.

[0054] In the cutting device 1 according to the above-described embodiment, the gantry 42 is provided with a safety protection sheet 51 and a curing sheet 52 that cover the cutting portion 3. With such a configuration, since the safety protection sheet 51 and the curing sheet 52 move together with the gantry 42 in accordance with the cutting location of the concrete floor slab 22, it is not necessary to cover the entire concrete floor slab 22 with the safety protection sheet 51 and the curing sheet 52, and the labor required for the installation and removal of the safety protection sheet 51 and the curing sheet 52 can be reduced.

[0055] In the cutting device 1 according to the above-described embodiment, freely rotatable pulleys 35 are respectively provided on both sides of the wire saw cutting portion 311. With such a configuration, the wire saw cutting portion 311 can be arranged on the front side and the rear side in the moving direction (one side and the other side in the girder length direction) with respect to the driving pulleys 32 and 33. Therefore, whether the gantry 42 is advanced to move the cutting portion 3 to one side in the girder length direction or to the other side in the girder length direction, the concrete floor slab 22 can be cut. That is, it is possible to cut the concrete floor slab 22 while reciprocating the cutting portion 3 in the girder length direction.

[0056] In the cutting device 1 according to the above-described embodiment, it has a first driving pulley lifting portion 453 and a second driving pulley lifting portion 454 that move the first driving pulley 32 and the second driving pulley 33 in the vertical direction. With such a configuration, by moving the first driving pulley 32 and the second driving pulley 33 in the vertical direction and also moving the wire saw cutting portion 311 in the vertical direction, the concrete floor slab 22 can be cut not only in the girder length direction but also in the vertical direction. Further, by moving the wire saw cutting portion 311 in the vertical direction while moving it in the girder length direction, it can be cut in an oblique direction.

[0057] (Second Embodiment) Next, another embodiment will be described with reference to the accompanying drawings. For members and parts that are the same as or similar to those in the above-described first embodiment, the same reference numerals will be used and the description will be omitted, and the configuration different from the embodiment will be described. As shown in FIG. 6, the cutting device 1B according to the second embodiment is configured to be able to simultaneously cut two steel girder joints 24, 24 arranged at intervals in the girder width direction. Of the two steel girder joints 24, 24, the steel girder joint 24 on one side in the girder width direction is defined as the first steel girder joint 242, and the steel girder joint 24 on the other side is defined as the second steel girder joint 243.

[0058] Also in the second embodiment, two drive pulleys 32, 33 are provided as in the first embodiment, and the two second drive pulleys 32, 33 rotate in synchronization with each other at the same rotational speed. In the second embodiment, the wire saw 31 is arranged longer in the girder width direction than in the first embodiment. For this reason, an auxiliary pulley 341 around which the wire saw 31 is wound is provided between the portion of the wire saw 31 that cuts the first steel girder joint 242 and the portion that cuts the second steel girder joint 243. In the second embodiment, a groove portion 221 that penetrates vertically and extends in the girder length direction is provided in a portion between the first steel girder joint 242 and the second steel girder joint 243 in the flat plate portion 25 of the concrete floor slab 22. The auxiliary pulley 341 penetrates the groove portion 221 and is installed at the lower part of a pole 342 whose upper part is fixed to the gantry 42.

[0059] In the second embodiment, the idle pulleys 35 are arranged on both sides in the girder width direction of each of the first steel girder joint 242 and the second steel girder joint 243. In the second embodiment, four idle pulleys 35 are provided.

[0060] The cutting device 1B according to the second embodiment described above has the same effects as those of the first embodiment. Furthermore, the cutting device 1B according to the second embodiment can simultaneously cut the concrete floor slab 22 joined to the two steel girders 21. When cutting the concrete floor slab 22 for each steel girder joint 24 (steel girder 21), it is necessary to provide shoring for the portion of the concrete floor slab 22 that has been cut first. In this embodiment, since a plurality of steel girder joints 24 arranged at intervals in the girder width direction can be cut simultaneously, there is no need to provide shoring, and the labor, time, and cost required for shoring installation can be reduced.

[0061] As described above, the embodiments of the cutting device according to the present invention have been explained. However, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the gist thereof. For example, in the above embodiment, two drive pulleys 32 and 33 are provided in the cutting device 1. Two or more drive pulleys 32 and 33 may be provided in the cutting device 1. In the above embodiment, the drive pulleys 32 and 33 are arranged (vertically placed) such that the rotation axes extend in the girder length direction. The drive pulleys 32 and 33 may be arranged (horizontally placed) such that the rotation axes extend in the vertical direction.

[0062] In the cutting device 1 according to the above embodiment, the moving part 4 has a rail and a gantry 42 that supports the cutting part 3 and can travel on the rail. The form of the moving part 4 that moves the cutting part 3 may be other than the above. When rails are installed, the number, form, and installation position of the rails may be set as appropriate.

[0063] In the cutting device 1 according to the above embodiment, the moving part 4 has a plurality of traveling rollers 43 attached to the gantry 42 and traveling on the rail, and a motor 44 that rotates each of the plurality of traveling rollers 43. The plurality of traveling rollers 43 rotate in synchronization with the same rotation speed. The number of traveling rollers 43 and the control of the traveling rollers 43 may be set as appropriate.

[0064] In the cutting device 1 according to the above embodiment, the gantry 42 is provided with a safety protection sheet 51 and a curing sheet 52 that cover the cutting unit 3. The safety protection sheet 51 and the curing sheet 52 may be provided outside the gantry 4 such as the composite girder 2. Also, one of the safety protection sheet 51 and the curing sheet 52 may be provided on the gantry 42, and the other may be provided outside the gantry 4 such as the composite girder 2.

[0065] In the cutting device 1 according to the above embodiment, a pair of swivel pulleys 35 are provided, and the wire saw 31 is configured to be able to cut the concrete floor slab 22 whether the gantry 42 moves forward or backward. On the other hand, the cutting device 1 may not be provided with a pair of swivel pulleys 35 as described above. The cutting device 1 may be configured to cut the concrete floor slab 22 only when moving in one direction.

[0066] In the cutting device 1 according to the above embodiment, a first driving pulley elevating / lowering unit 453 and a second driving pulley elevating / lowering unit 454 for moving the first driving pulley 32 and the second driving pulley 33 in the vertical direction are provided. Even if the first driving pulley elevating / lowering unit 453 and the second driving pulley elevating / lowering unit 454 are not provided, the first driving pulley 32 and the second driving pulley 33 may be configured to be elevating / lowering within the city.

[0067] In the above second embodiment, two steel girder joints 24 arranged in the girder width direction are cut simultaneously, but three or more steel girder joints 24 arranged in the girder width direction may be cut simultaneously.

[0068] The cutting devices 1 and 1B according to the above embodiment cut the concrete floor slab 22 of the composite girder 2 horizontally. On the other hand, when cutting a concrete member other than the concrete floor slab 22 or when cutting a concrete member in a direction other than the horizontal direction, the cutting devices 1 and 1B may be used.

Explanation of Reference Numerals

[0069] 1, 1B Cutting device 3 Cutting unit 4 Moving unit 22 Concrete floor slab (concrete member) 24 Steel truss joint 31 Wire saw 32, 33 Driving pulley 35 Idler pulley 41 Rail 42 Stand 43 Running roller 44 Motor 46 Driving pulley moving part 51 Safety protection sheet 52 Curing sheet 311 Wire saw cutting part

Claims

1. A cutting unit for cutting a concrete member, and a moving unit for moving the cutting unit in the front-rear direction, the cutting unit comprising: The cutting unit includes: an endless loop-shaped wire saw for cutting the concrete member, and a plurality of drive pulleys around which the wire saw is wound to rotate the wire saw, wherein the plurality of drive pulleys rotate in synchronization at the same rotational speed with each other, the plurality of drive pulleys each have a rotation axis extending in the front-rear direction, are arranged at intervals in a horizontal direction intersecting the front-rear direction, and include two drive pulleys around which the wire saw is wound on the upper side, an auxiliary pulley disposed at a position below the rotation axes of the two drive pulleys between the two drive pulleys, around which the wire saw moving between the two drive pulleys is wound, and a drive pulley moving unit for moving the two drive pulleys in the vertical direction to move the concrete cutting portion for cutting the concrete member in the wire saw in the vertical direction, a cutting device for cutting the concrete member while performing at least one of moving the cutting unit in the front-rear direction by the moving unit and moving the two drive pulleys in the vertical direction by the drive pulley moving unit.

2. The moving unit includes: a rail, and a gantry that supports the cutting unit and is capable of traveling on the rail, the cutting device according to claim 1.

3. The moving unit includes: a plurality of traveling rollers attached to the gantry and traveling on the rail, and a motor for rotating each of the plurality of traveling rollers, wherein the plurality of traveling rollers rotate in synchronization at the same rotational speed with each other, the cutting device according to claim 2.

4. The rail is installed on the concrete member, the cutting device according to claim 2 or 3.

5. At least one of a safety protection sheet covering the cutting unit and a curing sheet for preventing scattering of dust and cutting treatment water during cutting is provided on the gantry, the cutting device according to any one of claims 2 to 4.

6. Free pulleys are respectively provided on both sides of the cutting portion for cutting the concrete member in the wire saw, around which the wire saw is wound, wherein the free pulley can adjust the position of the cutting portion with respect to the drive pulley in the moving direction of the cutting unit, the cutting device according to any one of claims 1 to 5.

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