JP2023037401A - cutting device - Google Patents

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

The present invention relates to a cutting device.

In composite girders where steel girders and concrete floor slabs are joined together with anti-slip joints, when replacing the concrete slabs of composite girders, a cutting device equipped with a looped wire saw is used to cut the concrete slabs parallel to the steel girders. It may be removed by cutting it into pieces (see, for example, Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. 2019-31868 JP 2009-114688 A

When cutting a concrete floor slab with a wire saw, if the wire saw becomes slack, the cutting position may shift and the steel girders may be damaged. For this reason, the cutting of the concrete floor slab with a wire saw is performed at a position spaced apart from the steel girder, that is, at a position above the upper surface of the steel girder.
In the concrete floor slab removal work, after removing the upper part of the cutting position, the lower part must be removed by chipping with a chipping hammer or water jet. The problem is that it takes time and effort.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cutting apparatus capable of suppressing slackness of a wire saw and suppressing deviation of a cutting position.

In order to achieve the above object, a cutting apparatus according to the present invention has a cutting section for cutting a concrete member and a moving section for moving the cutting section, the cutting section being an endless machine for cutting the concrete member. A loop-shaped wire saw and a plurality of drive pulleys around which the wire saw is wound to rotate the wire saw are provided, and the plurality of drive pulleys rotate in synchronization with each other at the same rotation speed.

In the present invention, the wire saw is wound around the plurality of drive pulleys, so that the wire saw is sent out by at least one of the plurality of drive pulleys and wound around the other drive pulleys. By rotating the plurality of drive pulleys at the same number of rotations in synchronization with each other, the force of the drive pulleys to send out the wire saw and the force to wind up the wire saw become the same. As a result, the slackness of the wire saw can be suppressed, and the blurring of the cutting position can be suppressed.

Moreover, in the cutting apparatus according to the present invention, the moving section may have a rail and a mount capable of supporting the cutting section and traveling on the rail.

With such a configuration, the cutting part supported by the mount can be moved along the rail, so that the deviation of the cutting position can be suppressed.

Further, in the cutting apparatus according to the present invention, the moving unit has a plurality of running rollers attached to the frame and running on the rail, and motors for rotating the plurality of running rollers. The running rollers may rotate in synchrony with each other at the same number of revolutions.

With such a configuration, the pedestal running on the rail is not shaken, so it is possible to suppress the shake of the cutting position.

Moreover, in the cutting device according to the present invention, the rail may be installed on the concrete member.

By setting it as such a structure, a rail can be installed easily. Since the worker does not have to enter the underside of the concrete member to install the rail, the work can be done safely.

Further, in the cutting apparatus according to the present invention, the mount may be provided with at least one of a safety protection sheet covering the cutting portion and a protective sheet for preventing scattering of dust and cutting water during cutting.

With such a configuration, the safety protection sheet and the curing sheet move together with the frame according to the cut part of the concrete member, so there is no need to cover the entire concrete member with the safety protection sheet or the protection sheet. It is possible to reduce the labor required to install and remove the curing sheet.

Further, in the cutting device according to the present invention, a pair of universal pulleys are provided on both sides of a cutting portion for cutting the concrete member in the wire saw, and the wire saw is wound around the pair of universal pulleys. , the position of the cutting portion relative to the drive pulley may be adjustable in the direction of movement of the cutting portion.

With such a configuration, the cutting portion of the wire saw can be arranged on the front side and the rear side of the moving direction of the cutting portion with respect to the drive pulley. Therefore, when the moving part can move the cutting part in the front-rear direction, if the cutting position of the wire saw is arranged behind the direction in which the drive pulley moves, even when the cutting part is advanced, the cutting part can be moved backward. The concrete member can also be cut when the
can.

Moreover, the cutting apparatus according to the present invention may have a driving pulley moving section that moves the plurality of driving pulleys in a direction intersecting with the moving direction of the cutting section.

With such a configuration, the plurality of drive pulleys are moved in a direction intersecting the movement direction of the cutting part, and the wire saw is also moved in this direction, thereby cutting the concrete member in a direction intersecting with the movement direction of the cutting part. You can also cut in any direction.

ADVANTAGE OF THE INVENTION According to this invention, the looseness of a wire saw can be suppressed and the blurring of a cutting position can be suppressed.

1 is a front view of a cutting device according to a first embodiment; FIG. 1 is a side view of a cutting device according to a first embodiment; FIG. It is a top view of a moving part. It is a top view of a mount frame. It is a side view of a mount. It is a front view of the cutting device by 2nd Embodiment.

(First embodiment)
A cutting device 1 according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.
As shown in FIG. 1, the cutting apparatus 1 according to the first embodiment cuts 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 by the anti-slip 23 and integrated. It is used to cut the concrete floor slab 22 when removing it. In addition, in FIG. 1 , reference numeral 23 denotes a range in which the anti-slippage is provided. 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, the direction orthogonal to the paper surface in FIG. 1). In this embodiment, the girder length direction is substantially horizontal. The horizontal direction orthogonal to the girder length direction is the girder width direction (direction of arrow B in the figure).

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 longitudinal direction of the girder. A portion of the concrete floor slab 22 directly above the steel girder 21 protrudes downward from both sides of the portion in the girder width direction and is joined to the steel girder 21 . A portion of the concrete floor slab 22 that protrudes downward and is joined to the steel girder 21 is referred to as a steel girder joint portion 24 . An anti-slip 23 is arranged at the steel girder joint 24 . A flat plate portion 25 is provided above the steel girder joint portion 24 in the concrete floor slab 22 .

The cutting device 1 cuts the steel girder joint 24 together with the anti-slip 23 at a position above the upper surface of the steel girder 21 . The anti-slip 23 has a lower end joined to the steel girder 21 and an upper end arranged above a cutting position 26 by the cutting device 1 . A portion 27 of the concrete floor slab 22 below the cutting position 26 by the cutting device 1 is scraped off with a chipping hammer, a water jet, or the like.

The cutting device 1 has a cutting section 3 that cuts the concrete floor slab 22 and a moving section 4 that moves the cutting section 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 longitudinal direction of the girder. The cutting device 1 cuts the concrete floor slab 22 in the girder length direction by moving the cutting section 3 that cuts the concrete floor slab 22 in the girder width direction by the moving section 4 in the girder length direction.

As shown in FIGS. 1 to 3, the moving part 4 includes a pair of rails 41, 41 installed on the concrete floor slab 22 to be cut, a base 42 supporting the cutting part 3, and a base 42. It has a plurality of running rollers 43 running on the rail 41 and a motor 44 (see FIGS. 2 and 3) connected to the running rollers 43 . 4 and 5 show the details of the pedestal 42, the running rollers 43 and the motor 44. FIG.

A pair of rails 41, 41 are installed in a direction extending in the longitudinal direction of the girder. A pair of rails 41 , 41 are anchored to the concrete floor slab 22 . Holes 411 (see FIG. 3) through which anchors are inserted are formed in the pair of rails 41, 41, respectively.
The pedestal 42 is movable along the rail 41 in the longitudinal direction of the girder. The details of the mount 42 will be described later.

As shown in FIGS. 1 and 2, the cutting unit 3 includes an endless loop wire saw 31 for cutting the concrete floor 22, and two drive pulleys around which the wire saw 31 is wound to rotate the wire saw 31. It has 32 and 33 (a plurality of drive pulleys 32 and 33) and a plurality of auxiliary pulleys 34 that guide the wire saw 31 that rotates. In FIG. 1, the wire saw 31 is indicated by a dashed line.
The two drive pulleys 32 and 33 and the plurality of auxiliary pulleys 34 are each supported by the frame 42 .

The two drive pulleys 32 and 33 are arranged above the pedestal 42, respectively. That is, the two drive pulleys 32 and 33 are arranged above the concrete floor slab 22, respectively. The two drive pulleys 32 and 33 have the same diameter, and are spaced apart in the width direction of the girder with their respective axes extending in the length direction of the girder.

The wire saw 31 is arranged above and below the concrete floor slab 22 . A wire saw 31 is wound around two driving pulleys 32 and 33 above the concrete floor slab 22, and passes through the concrete floor 22 from both sides of the two driving pulleys 32 and 33 in the girder width direction. It extends downward through the side of the slab 22 and extends in the girder width direction below the flat plate portion 25 of the concrete floor slab 22 . A portion of the wire saw 31 extending in the girder width direction below 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 the loop, the portion penetrating the steel girder joint 24 cuts the steel girder joint 24 in the girder length direction. A wire saw cut portion 311 (see FIG. 1) is a portion of the wire saw 31 that extends in the width direction of the girder below the flat plate portion 25 .

The wire saw 31 rotated by the driving of the two drive pulleys 32 and 33 moves from one side to the other side in the girder width direction above the concrete floor slab 22, and below the concrete floor slab 22 in the girder width direction. from the other side of the The wire saw 31 is directed from the upper side to the lower side on one side in the girder width direction, and is directed from the lower side to the upper side on the other side in the girder width direction.

An auxiliary pulley 34 is provided at a portion for switching the feeding direction of the wire saw 31 that rotates in a loop shape. In this embodiment, universal pulleys 35, 35 are provided on both sides of the steel girder joint portion 24 in the girder width direction. A wire saw cutting portion 311 is provided between two universal pulleys 35, 35 provided with the steel girder joint portion 24 interposed therebetween.

As shown in FIG. 2, the universal pulley 35 rotates around a first axis 351 passing through its center and is supported so as to be rotatable through 360° around a second axis 352 intersecting the first axis 351 . The universal pulley 35 of this embodiment is arranged such that the second axis 352 extends vertically and the first axis always extends horizontally.

The wire saw 31 extends vertically above the universal pulley 35 and horizontally extends below the universal pulley 35 . Since the universal pulley 35 is rotatably supported by 360° around the second axis, the portion of the wire saw 31 below the universal pulley 35, that is, the wire saw cutting portion 311 can be cut in any direction along the horizontal plane. can also extend.

Returning to FIG. 1, of the two drive pulleys 32 and 33, the drive pulley 32 arranged on one side in the girder width direction is the first drive pulley 32, and the drive pulley 33 arranged on the other side in the girder width direction. is the second drive pulley 33 . The first drive pulley 32 and the second drive pulley 33 have the same shape, and are controlled so that they have the same rotational speed and are synchronized with each other. In this embodiment, the first drive pulley 32 and the second drive pulley 33 are each connected to separate motors (not shown). Each motor is connected to a separate hydraulic unit. In this embodiment, one operation box can be operated so that the first drive pulley 32 and the second drive pulley 33 are synchronized.

As described above, above the concrete floor slab 22, the wire saw 31 extends from one side to the other side in the girder width direction. Specifically, the wire saw 31 is fed to the first drive pulley 32 and directed downward, turned by the auxiliary pulley 34 to move to the other side in the girder width direction, and changed direction by the auxiliary pulley 34 to move upward. The second drive pulley 33 is reached. When the wire saw 31 reaches the second drive pulley 33, it is sent out to the second drive pulley 33, directed to the lower side of the concrete floor slab 22, turned by the auxiliary pulley 34, and freely directed to one side in the girder width direction. It passes through the pulley 35 and cuts the steel girder joint 24 . The wire saw 31 cuts the steel girder joint 24 under the concrete floor slab 22 and is pulled back by the first drive pulley 32 when passing through the free pulley 35 and reaching the first drive pulley 32 again. and reaches the first drive pulley 32 .

As described above, the first driving pulley 32 and the second driving pulley 33 are controlled so that their rotation speeds are the same and are synchronized. As a result, the force of the second drive pulley 33 sending out the wire saw 31 and the force of the first drive pulley 32 pulling back the wire saw 31 are the same. As a result, the wire saw 31 is in a taut state, and slackness is suppressed.

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

The first mount 421 runs along one rail 41 of the pair of rails 41 , 41 , and the second mount 422 runs along the other rail 41 . The running rollers 43 are provided on each of the first base 421 and the second base 422 . The running rollers 43 provided on the first frame 421 and running along one rail 41 are referred to as first running rollers 431, and the running rollers 43 provided on the second frame 422 and running along the other rail 41 are referred to as first running rollers 431. 2 running rollers 432 .

The first running roller 431 and the second running roller 432 are connected to different motors 44, respectively. The first running roller 431 and the second running roller 432 are controlled to rotate in synchronism. In this embodiment, it is possible to control the rotation of the first running roller 431 and the second running roller 432 and the rotation of the first driving pulley 32 and the second driving pulley 33 to synchronize with each other.

The connecting portion 423 connects the first mount 421 and the second mount 422 to match the gap between the pair of rails 41 , 41 . The connecting part 423 may have an adjuster function for adjusting the interval between the first mount 421 and the second mount 422 . Also, the first mount 421 and the second mount 422 may be configured to be connectable by a plurality of connecting portions 423 having different lengths. As a result, the first mount 421 and the second mount 422 may be connected at the connecting portion 423 selected according to the interval between the rails 41 , 41 .

The drive pulley support portion 45 includes a first pole 451 erected on the first mount 421 , a second pole 452 erected on the second mount 422 , and a first drive pulley 32 attached along the first pole 451 . A first drive pulley elevating unit 453 (driving pulley moving unit) that can move vertically along the second pole 452, and a second drive pulley elevating unit that can move vertically along the second pole 452 to which the second drive pulley 33 is attached. 454 (driving pulley moving part).

The first driving pulley lifting section 453 and the second driving pulley lifting section 454 are arranged so that the first driving pulley 32 and the second driving pulley 33 are at the same height. As described above, the first drive pulley 32 and the second drive pulley 33 are oriented with their axes extending in the longitudinal direction of the spar. When the first drive pulley elevating unit 453 and the second drive pulley elevating unit 454 ascend and descend and the first drive pulley 32 and the second drive pulley 33 ascend and descend, the first drive pulley 32 and the second drive pulley 33 are wound around. The wire saw 31 moves up and down. When the wire saw 31 is lifted and the wire saw cutting portion 311 for cutting the steel girder joint 24 is also lifted, the steel girder joint 24 and the flat plate portion 25 of the concrete floor slab 22 are moved upward and cut in the vertical direction. is possible. The elevation of the first drive pulley elevation unit 453 and the second drive pulley elevation unit 454 is performed by driving a hydraulic motor, for example.

The stand 42 is provided with a safety protection sheet 51 and a protective sheet 52 for covering the cutting section 3 . The safety protection sheet 51 and the protective sheet 52 are fixed to the first pole 451 and the second pole 452 of the base 42 and the drive pulley support portion 45, and the like. The mounting frame 42 may be provided with mounting members for mounting the safety protection sheet 51 and the protective sheet 52 .

The pedestal 42 may be provided with a dust collector for collecting dust generated when the concrete floor slab 22 is cut by a dry method, a water injection means for when the cutting is performed by a wet method, and the like. The dust collector and the water injection means are suspended and supported by the frame 42 so that they can be arranged in the vicinity of the steel girder joints 24 of the concrete floor slab 22, for example.

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

The two drive pulleys 32 and 33 are rotated in synchronism, and the running roller 43 is synchronously rotated, so that the frame 42 is made to run in the longitudinal direction of the girder. When the gantry 42 moves from one side to the other side in the longitudinal direction of the girders, the wire saw cut portion 311 is also pulled by the driving pulleys 32 and 33 of the gantry 42 and moves from one side to the other side in the longitudinal direction of the girders. do. At this time, the universal pulleys 35 provided on both sides of the wire saw cutting portion 311 are rotated around the second axis so that the wire saw cutting portion 311 is on the rear side of the free pulley 35 (one side in the girder length direction). Rotate.
On the other hand, when the gantry 42 moves from the other side to the one side in the girder length direction, the wire saw cut portion 311 is also pulled by the gantry 42 and moves from the other side to the one side in the girder length direction. At this time, the universal pulley rotates about the second axis so that the wire saw cutting portion 311 is located behind the universal pulley 35 (the other side in the girder length direction).

After moving the cutting unit 3 to a predetermined position, the first drive pulley 32 and the second drive pulley 33 are lifted by the first drive pulley lifter 453 and the second drive pulley lifter 454 , and the wire saw cutting portion 311 The concrete floor slab 22 is cut upward. When the wire saw 31 moves above the concrete floor slab 22, the cut concrete floor slab 22 is removed.

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 scraped off with a chipping hammer, water jet, or the like.

Next, functions and effects of the cutting device 1 according to the first embodiment will be described.
In the cutting apparatus 1 according to the above-described embodiment, the wire saw 31 is wound around the first driving pulley 32 and the second driving pulley 33, whereby the wire saw 31 is sent out by the second driving pulley 33 to be the first driving pulley. It is wound around the pulley 32 . Then, the first driving pulley 32 and the second driving pulley 33 rotate in synchronization with each other at the same number of rotations, so that the force of the second driving pulley 33 to feed the wire saw 31 and the force of the first driving pulley 32 to feed the wire saw 31 has the same magnitude as the force that winds up the Thereby, slackness of the wire saw 31 can be suppressed, and blurring of the cutting position 26 can be suppressed. That is, cutting accuracy is improved.
As a result, since the cutting position 26 can be positioned closer to the steel girder 21, the portion 27 below the cutting position 26 is reduced, and the scraping work for the portion 27 below the cutting position 26 is reduced. can do.
Moreover, since the two drive pulleys 32 and 33 are provided, the rotation speed can be increased, and the construction speed can be increased.

In the cutting device 1 according to the above embodiment, the moving part 4 has the rails 41 and the mount 42 that supports the cutting part 3 and can travel on the rails 41 .
With this configuration, the cutting part 3 supported by the mount 42 can be moved along the rails 41, so that the cutting position 26 can be prevented from blurring.

In the cutting device 1 according to the above-described embodiment, the moving unit 4 has a plurality of running rollers 43 attached to the base 42 and running on the rails 41, and the motors 44 that rotate the plurality of running rollers 43, respectively. , run rollers 43 rotate in synchronization with each other at the same number of revolutions.
With such a configuration, the pedestal 42 running on the rails 41 does not move, so that the cutting position 26 can be prevented from moving.

In the cutting device 1 according to the above embodiment, the rail is installed on the concrete floor slab 22 .
By setting it as such a structure, a rail can be installed easily. Since there is no need for workers to enter the underside of the concrete floor slab 22 to install the rails, the work can be done safely.

In the cutting apparatus 1 according to the above-described embodiment, the stand 42 is provided with the safety protective sheet 51 and the protective sheet 52 that cover the cutting section 3 .
With such a configuration, the safety protection sheet 51 and the curing sheet 52 move together with the stand 42 along with the cut portion of the concrete floor slab 22, so that the entire concrete floor slab 22 can be covered with the safety protection sheet 51 and the protection sheet 52. There is no need to cover it, and labor for installing and removing the safety protection sheet 51 and the protective sheet 52 can be reduced.

In the cutting device 1 according to the above embodiment, the free pulleys 35 are provided on both sides of the wire saw cutting portion 311 respectively.
With such a configuration, the wire saw cutting portion 311 can be arranged on the front side and the rear side of the driving pulleys 32 and 33 in the moving direction (one side and the other side in the girder length direction). Therefore, the concrete floor slab 22 can be cut by advancing the frame 42 to move the cutting portion 3 to one side in the girder length direction and moving to the other side in the girder length direction. can. That is, the concrete floor slab 22 can be cut while reciprocating the cutting part 3 in the longitudinal direction of the girder.

The cutting device 1 according to the above embodiment has the first driving pulley lifting section 453 and the second driving pulley lifting section 454 for moving the first driving pulley 32 and the second driving pulley 33 in the vertical direction.
With this configuration, the first driving pulley 32 and the second driving pulley 33 are moved vertically, and the wire saw cut portion 311 is also moved vertically, thereby moving the concrete floor slab 22 in the girder length direction. It can cut not only in the vertical direction but also in the vertical direction. Also, by moving the wire saw cutting portion 311 in the longitudinal direction and also in the vertical direction, it is possible to cut in an oblique direction.

(Second embodiment)
Next, another embodiment will be described with reference to the accompanying drawings. The same or similar members and portions as those of the above-described first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. will be explained.
As shown in FIG. 6, the cutting device 1B according to the second embodiment is configured to be capable of simultaneously cutting two steel girder joints 24, 24 spaced apart 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 designated as a first steel girder joint 242, and the steel girder joint 24 on the other side is designated as a second steel girder joint 243. and

Also in the second embodiment, two drive pulleys 32 and 33 are provided in the same manner as in the first embodiment, and the second drive pulleys 32 and 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. Therefore, 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. there is
In the second embodiment, a groove portion 221 extending in the girder length direction penetrates vertically through a portion between the first steel girder joint portion 242 and the second steel girder joint portion 243 in the flat plate portion 25 of the concrete floor slab 22. is provided. The auxiliary pulley 341 passes through the groove portion 221 and is installed below a pole 342 whose upper portion is fixed to the pedestal 42 .

In the second embodiment, the universal pulleys 35 are arranged on both sides of the first steel girder joint portion 242 and the second steel girder joint portion 243 in the girder width direction. In the second embodiment, four universal pulleys 35 are provided.

The cutting device 1B according to the second embodiment described above has the same effect as 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 the concrete floor slab 22 is cut for each steel girder joint 24 (steel girder 21), it is necessary to provide shoring in the portion where the concrete floor slab 22 is 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 install shoring, and the labor, time, and cost required for installing shoring can be reduced. be able to.

Although the embodiments of the cutting device according to the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention.
For example, in the above embodiment, the cutting device 1 is provided with two drive pulleys 32 and 33 . The cutting device 1 may be provided with two or more drive pulleys 32 and 33 .
In the above-described embodiment, the drive pulleys 32 and 33 are arranged (vertical) so that the rotation axis extends in the longitudinal direction of the girder. The drive pulleys 32 and 33 may be arranged (horizontally placed) so that the rotation axis extends in the vertical direction.

In the cutting device 1 according to the above-described embodiment, the moving part 4 has a rail and a pedestal 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, shape, and installation position of the rails may be appropriately set.

In the cutting apparatus 1 according to the above-described embodiment, the moving unit 4 has a plurality of running rollers 43 attached to the base 42 and running on the rails, and the motors 44 that rotate the plurality of running rollers 43, respectively. The running rollers 43 rotate in synchronization with each other at the same number of rotations. The number of running rollers 43 and the control of the running rollers 43 may be set as appropriate.

In the cutting apparatus 1 according to the above-described embodiment, the stand 42 is provided with the safety protective sheet 51 and the protective sheet 52 that cover the cutting section 3 . The safety protection sheet 51 and the protective sheet 52 may be provided other than the frame 4 such as the composite girder 2 . Also, one of the safety and protection sheet 51 and the protective sheet 52 may be provided on the frame 42 and the other may be provided on the composite girder 2 or the like other than the frame 4 .

The cutting apparatus 1 according to the above embodiment is provided with a pair of universal pulleys 35 so that the wire saw 31 can cut the concrete slab 22 both when the frame 42 moves forward and when it moves backward. On the other hand, the cutting device 1 may not be provided with the pair of universal 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.

The cutting device 1 according to the above embodiment is provided with the first driving pulley lifting section 453 and the second driving pulley lifting section 454 for moving the first driving pulley 32 and the second driving pulley 33 in the vertical direction. The first driving pulley lifting section 453 and the second driving pulley lifting section 454 may not be provided, and the first driving pulley 32 and the second driving pulley 33 may be structured within the lifting direction.

In the second embodiment described above, 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 are cut simultaneously. may

The cutting devices 1 and 1B according to the above embodiments cut the concrete floor slab 22 of the composite girder 2 horizontally. On the other hand, the cutting devices 1 and 1B may be used 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.

1, 1B cutting device 3 cutting unit 4 moving unit 22 concrete floor slab (concrete member)
24 Steel girder joint 31 Wire saws 32, 33 Drive pulley 35 Universal pulley 41 Rail 42 Frame 43 Running roller 44 Motor 46 Drive pulley moving part 51 Safety protection sheet 52 Curing sheet 311 Wire saw cut part

Claims (7)

a cutting section that cuts the concrete member;
a moving unit that moves the cutting unit,
The cutting part is
an endless loop wire saw for cutting the concrete member;
a plurality of drive pulleys around which the wire saw is wound to rotate the wire saw;
A cutting device in which the plurality of drive pulleys rotate in synchronism with each other at the same number of revolutions. The moving part is
a rail;
2. The cutting device according to claim 1, further comprising a frame that supports the cutting section and can run on the rail. The moving part is
a plurality of running rollers attached to the frame and running on the rail;
and a motor that rotates each of the plurality of running rollers,
3. The cutting device according to claim 2, wherein the plurality of running rollers rotate in synchronization with each other at the same number of revolutions. 4. The cutting device according to claim 2 or 3, wherein the rail is installed on the concrete member. 5. The pedestal according to any one of claims 2 to 4, wherein at least one of a safety protection sheet that covers the cut portion and a curing sheet that prevents scattering of dust and cutting water during cutting is provided on the mount. cutting device. A universal pulley provided on each side of the cutting portion for cutting the concrete member in the wire saw and around which the wire saw is wound,
The cutting device according to any one of claims 1 to 5, wherein the universal pulley can adjust the position of the cutting portion with respect to the drive pulley in the moving direction of the cutting portion. 7. The cutting device according to any one of claims 1 to 6, further comprising a drive pulley moving section that moves the plurality of drive pulleys in a direction intersecting with the moving direction of the cutting section.

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