JP2017193126A - Concrete wall cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete wall cutting device which can cut simultaneously in parallel in vertical and horizontal directions a concrete wall being continuous over a considerable length in the extending direction using a wire saw to efficiently dismantle the concrete wall.SOLUTION: A concrete wall cutting device used when an existing concrete wall balustrade 50 installed continuously in the extending direction is cut for each predetermined length using wire saws 21 and 31 to be dismantled and removed, is provided with a horizontal rotation drive mechanism 20 and a vertical rotation drive mechanism 30 so that the wire saw 21 for horizontal cutting and the wire saw 31 for vertical cutting can be rotationally driven at the same time to cut the existing wall balustrade 50 in parallel in the horizontal direction L and the vertical direction H. The horizontal rotation drive mechanism 20 and the vertical rotation drive mechanism 30 are respectively provided with a horizontal drive pulley 22 or a vertical drive pulley 32 which can be rotated by a driving part 40 about a rotary drive shaft 41 arranged in a width direction W perpendicular or substantially perpendicular to the wall balustrade 50.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a concrete wall cutting device, and more particularly to a concrete wall cutting device used when an existing concrete wall continuously installed in an extending direction is cut and dismantled by using a wire saw.

  For example, concrete wall rails installed along the side edges in the width direction of road bridges, elevated roads, etc. It is formed along the side edge of the concrete slab, and mainly has a function of guiding the line of sight of the driver of the traveling vehicle and preventing the traveling vehicle from deviating outside the road.

  Since concrete wall rails and other existing concrete walls have been built and have deteriorated in quality due to many years of aging, existing concrete walls that have deteriorated over time, such as There is a need to dismantle and remove or renovate.

  As a method of dismantling an existing concrete structure, a method of crushing and removing using a heavy machine for crushing such as a breaker is generally known, but in a method using a heavy machine for crushing, vibration during crushing and In recent years, various methods of dismantling and removing existing concrete structures by cutting them with a wire saw have been proposed because they may affect the surrounding environment due to impact (for example, patent documents). 1).

  In the method of dismantling a concrete structure using a wire saw, for example, a known wire saw formed by pushing diamond beads for cutting into a steel wire in a rosary shape and fixing them at regular intervals is used as a concrete to be cut. A concrete structure is cut by winding it endlessly around the structure and rotating it at high speed.

JP-A-6-936515

  The dismantling method of Patent Document 1 is a concrete structure that enables a so-called box culvert-shaped underground structure constructed by being buried in the ground to be dismantled with high efficiency using a wire saw. When the concrete structure to be formed is a concrete wall formed continuously over a considerable length in the extending direction, the concrete continues over a considerable length in the extending direction. Development of a new technology for enabling efficient dismantling of walls is desired.

  In particular, when the concrete wall that continues for a considerable length in the extending direction is a concrete wall rail installed along the side edge in the width direction of a road bridge or an elevated road, for example. It is necessary to dismantle the concrete wall efficiently while the road is still in service and in the state where the surrounding environment is not affected as much as possible. For example, it is desirable to provide a work area for cutting work with a wire saw as narrow as possible along the side edge in the width direction so that construction can be performed with the road in service, so that a large amount of water is not discharged. It is desirable to do. In addition, it is desirable that the concrete wall can be cut simultaneously in the vertical and horizontal directions with a single cutting device so as to improve work efficiency and shorten the construction period.

  The present invention makes it possible to cut a concrete wall continuous over a considerable length in the extending direction at the same time in parallel in the vertical and horizontal directions using a wire saw and efficiently dismantle the concrete wall. However, it is an object of the present invention to provide a concrete wall cutting device capable of working with a narrow work area when it is necessary to perform cutting work with a concrete wall railing while the road remains in service. And

  The present invention is a concrete wall cutting device for use in cutting and dismantling and removing existing concrete walls that are continuously installed in the extending direction at predetermined lengths using a wire saw. By providing a rotation drive mechanism and a longitudinal rotation drive mechanism, the transverse saw wire saw and the longitudinal cut wire saw are simultaneously driven endlessly to rotate the existing concrete wall in parallel with the transverse direction and the longitudinal direction. The horizontal direction rotation drive mechanism and the vertical direction rotation drive mechanism are arranged in a direction perpendicular or substantially perpendicular to the existing concrete wall by driving the drive unit. A lateral drive pulley or a longitudinal drive pulley that can rotate synchronously about an axis, and the lateral rotation drive mechanism includes the lateral drive pulley and the drive A transverse tension portion including at least a pair of transverse tension pulleys that can move relative to each other about a rotation axis that is parallel or substantially parallel to the rolling axis, and a pair of wires inserted through an existing concrete wall Transverse feed-out or pull-out guide pulleys, which are respectively arranged with the winding grooves facing the holes, and a plurality of lateral directions for guiding the transverse saw wire saw to be wound endlessly around these pulleys The longitudinal rotation drive mechanism includes at least a pair of the longitudinal drive pulley and a relatively movable unit that rotates about a rotation axis that is perpendicular or substantially perpendicular to the drive rotation axis. The longitudinal tension part including the longitudinal tension pulley and the pair of wire insertion holes formed through the existing concrete wall are arranged so that the winding grooves are opposed to each other. A concrete wall comprising a plurality of longitudinal guide pulleys for guiding the longitudinal saw wire saw so as to be wound around the pulleys in an endless manner. The above object is achieved by providing a cutting device.

  In the concrete wall cutting apparatus according to the present invention, it is preferable that the lateral feed or pull-out guide pulley is rotatably attached via a rotation connecting portion so that the direction of the rotation shaft is variable.

  In the concrete wall cutting apparatus of the present invention, it is preferable that the lateral drive pulley and the longitudinal drive pulley are connected to the drive unit so that only one of them can rotate.

  Furthermore, in the concrete wall cutting apparatus according to the present invention, it is preferable that the longitudinal drive pulley is disposed inside the lateral drive pulley with respect to an existing concrete wall.

  Furthermore, in the concrete wall cutting apparatus according to the present invention, the existing concrete wall is preferably a concrete wall rail installed along a side edge of the concrete slab.

  According to the concrete wall cutting apparatus of the present invention, a concrete wall continuous over a considerable length in the extending direction can be cut simultaneously in the vertical and horizontal directions using a wire saw and efficiently disassembled. In particular, when the concrete wall is a concrete wall rail and it is necessary to perform the cutting work while the road is still in service, the work area can be kept narrow and the work can be performed.

1 is a schematic plan view illustrating a configuration of a concrete wall cutting device according to a preferred embodiment of the present invention. It is a rough perspective view explaining arrangement of a wire saw and a pulley in a concrete wall cutting device concerning a preferred embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. 1 for explaining the configuration of the longitudinal rotation drive mechanism. The configuration of the longitudinal rotation drive mechanism will be described. (A) is a cross-sectional view taken along the line BB in FIG. 3, and (b) is a schematic cross-sectional view taken along the line CC in FIG. It is a schematic perspective view explaining arrangement | positioning of the wire saw and pulley in a longitudinal direction rotational drive mechanism. It is a schematic front view explaining the structure of a horizontal direction rotational drive mechanism. It is a schematic perspective view explaining arrangement | positioning of the wire saw and a pulley in a horizontal direction rotational drive mechanism.

  As shown in FIG. 1, a concrete wall cutting device 10 according to a preferred embodiment of the present invention is an existing concrete wall continuously installed in an extending direction, for example, a width direction in a road bridge, an elevated road, or the like. It is used as a cutting device when dismantling and removing such a concrete wall rail 50 in the construction for repairing the concrete wall rail 50 installed along the side edge of the wall. That is, for example, in the Tokyo Metropolitan Expressway, the concrete wall rail 50 has been aged due to deterioration over time after 50 years have passed since it was constructed. When dismantling and repairing a wall rail 50 made of prefabricated concrete, the existing wall rail 50, which has deteriorated over time, is cut and cut efficiently for each predetermined length. The concrete wall cutting device 10 of the present embodiment is used as a device for enabling this.

  In the present embodiment, the concrete wall cutting device 10 is used so that the road remains in service while the work area is kept narrow and the lane is restricted without using a heavy machine for crushing such as a breaker. However, the cutting operation can be performed in a compact manner, and the wall rail 50 is formed in an L shape in the vertical direction H along the height direction and in the horizontal direction (extending direction) L along the bottom. In addition, it is possible to cut in parallel in the vertical and horizontal directions (refer to FIG. 2), thereby improving work efficiency and shortening the construction period.

  And as shown in FIG.1 and FIG.2, the concrete wall cutting device 10 of this embodiment is aged by deterioration over time as an existing concrete wall continuously installed in the extending direction (lateral direction L). A cutting device used when the concrete wall height column 50 is cut at predetermined lengths using the wire saws 21 and 31 to be disassembled and removed, and the horizontal rotation driving mechanism 20 and the vertical rotation driving mechanism 30 are used. By cutting the existing wall height rail 50 in parallel with the horizontal direction L and the vertical direction H, the horizontal cutting wire saw 21 and the vertical cutting wire saw 31 are simultaneously rotated in an endless manner. Can be done. The lateral direction rotational drive mechanism 20 and the longitudinal direction rotational drive mechanism 30 are rotationally driven shafts arranged in a direction (width direction W) perpendicular or substantially perpendicular to the wall height column 50 that is an existing concrete wall by the drive of the drive unit 40. A horizontal driving pulley 22 or a vertical driving pulley 32 that can rotate synchronously around 41 is provided.

  The lateral rotation drive mechanism 20 includes a lateral drive pulley 22 and at least a pair of lateral tension pulleys 23a and 23b that rotate about a rotation shaft 23c that is parallel or substantially parallel to the drive rotation shaft 41 and that can move relative to each other. Lateral feeding or drawing in which the winding groove 24a is opposed to a pair of wire insertion holes 51a and 51b formed through the transverse tension portion 23 and the existing concrete wall rail 50, respectively. A guide pulley 24 and a plurality of lateral guide pulleys 25a, 25b, 25c, 25d, and 25e that guide the pulleys 23a, 23b, and 24 so that the transverse cutting wire saw 21 is wound endlessly are included. It consists of

  The longitudinal rotation drive mechanism 30 includes a longitudinal drive pulley 32 and at least a pair of longitudinal tension pulleys 33 a and 33 b that rotate about a rotation shaft 33 c that is perpendicular or substantially perpendicular to the drive rotation shaft 41 and is relatively movable. The winding groove 34a is opposed to one of the pair of wire insertion holes 51a and 51b (in this embodiment, the wire insertion hole 51b) formed through the longitudinal tension portion 33 and the existing concrete wall rail 50. And a plurality of longitudinal guide pulleys for guiding the longitudinal cutting wire saw 31 to be wound endlessly around the pulleys 33a, 33b, 34. 35a, 35b, 35c, 35d, and 35e.

  In this embodiment, the wall height column 50 which is an existing concrete wall continuously installed in the extending direction (lateral direction L) is, for example, along the side edge in the width direction in a road bridge, an elevated road, etc. It is a wall made of concrete (made of reinforced concrete) made of cast-in-place concrete. The wall height column 50 includes a wall main body portion 50a having a vertically long rectangular cross-sectional shape having a height (length in the vertical direction H) of about 1000 mm and a width (length in the width direction W) of about 150 mm, A ground cover portion 50b having a rectangular cross-sectional shape having a height of about 350 mm and a width of about 200 mm, formed so as to protrude inward (road side) from the lower portion of the main body portion 50a, is integrally formed. It has a shape. The wall height column 50, for example, by placing concrete for each predetermined construction span of about 10 m to several tens of meters, and by connecting the walls of these construction spans with an expansion joint, For example, it is continuously installed in the extending direction over a considerable extension of several hundred m to several km.

  When dismantling and removing such a concrete wall rail 50, for example, crushing using a heavy machine for crushing such as a breaker on a road bridge or an elevated road, the construction becomes large-scale, This is difficult because it will have a significant impact on vehicle traffic. In the present embodiment, for example, by cutting the wall height column 50 using the wire saws 21 and 31 by the concrete wall cutting device 10 every predetermined length of about 1 to 3 m (length in the lateral direction L). While maintaining the area compact, the dismantling and removal work of the wall rail 50 can be efficiently performed while the road remains in service.

  Moreover, in this embodiment, in order to cut | disconnect the wall height column 50 using the wire saws 21 and 31 for every predetermined length of about 1-3 m, for example, the bottom part by the ground cover part 50b of the wall height column 50 is set to the width direction W. A plurality of wire insertion holes 51 are formed by using a known concrete drilling device at a pitch of about 2 m (length in the lateral direction L), for example. Among the plurality of wire insertion holes 51, for example, a pair of adjacent wire insertion holes 51a and 51b is selected, and the wire saws 21 and 31 are inserted. By rotating at high speed endlessly by the direction rotation drive mechanism 30, the wall height column 50 is formed into an L shape in parallel to the vertical direction H and the horizontal direction L along the bottom, in the vertical direction H along the height direction. It can be cut simultaneously (see FIG. 2).

  As shown in FIGS. 3 to 5, the longitudinal rotation drive mechanism 30 constituting the concrete wall cutting apparatus 10 of the present embodiment includes a longitudinal drive pulley 32 and at least a pair of longitudinal tension pulleys 33a and 33b. Including a direction tension portion 33, a longitudinal feed or pull-out guide pulley 34 disposed with the winding groove 34a facing the wire insertion hole 51b, and a plurality of longitudinal guide pulleys 35a, 35b, 35c, 35d. It is configured. These pulleys 32, 33 a, 33 b, 34, 35 a, 35 b, 35 c, 35 d, and 35 e are assembled with a steel material such as a steel plate, angle steel, or channel steel, for example, height (length in the longitudinal direction H). ) The wire saw 31 is endlessly supported by a support frame 45 formed in a size that fits in a space area of 1400 mm, length (length in the lateral direction L) 2500 mm, and width (length in the width direction W) 1200 mm. The rotary shaft is rotatably attached in a state where the rotary shaft is arranged in a predetermined direction suitable for winding (see FIG. 1).

  The longitudinal drive pulley 32 is provided as a main pulley having a size of, for example, about 400 mm, and is connected to the drive motor 42 of the drive unit 40 together with the lateral drive pulley 22 of the lateral rotation drive mechanism 20 described later. . The longitudinal drive pulley 32 is synchronized with the lateral drive pulley 22 around the rotational drive shaft 41 arranged in the width direction W perpendicular or substantially perpendicular to the wall height column 50 by the drive of the drive motor 42 of the drive unit 40. And can be rotated. That is, the rotation drive shaft 41 is connected to the rotation shaft portion 42 a of the drive motor 42 via a known rotation transmission mechanism 43, and the rotation drive force transmitted from the drive motor 42 is connected to the longitudinal drive pulley 32. The lateral drive pulley 22 can be rotated coaxially (see FIG. 1).

  Further, in the present embodiment, the longitudinal drive pulley 32 and the lateral drive pulley 22 are detachably connected to the rotary drive shaft 41 via, for example, a known clutch mechanism or the like. Only the drive pulleys 32 and 22 are connected to the drive motor 42 of the drive unit 40 so as to be rotatable. As a result, the existing concrete wall height column 50 can be cut only in the vertical direction H along the height direction or only in the horizontal direction L along the bottom, as necessary. It has become.

  Further, in the present embodiment, the vertical driving pulley 32 is disposed on the inner side of the lateral driving pulley 22 (on the wall height column 50 side) with respect to the existing wall height column 50. As a result, the horizontal cutting wire saw 21 and the vertical cutting wire saw 31 can be arranged without crossing each other when viewed from above, and the wire saws 21 and 31 are efficiently driven to rotate endlessly. (See FIG. 1).

  Furthermore, in the present embodiment, the longitudinal drive pulley 32 is attached together with the lateral drive pulley 22 so as to be rotatable about a rotational drive shaft 41 arranged in the width direction W perpendicular or substantially perpendicular to the wall height column 50. Therefore, it rotates along a plane parallel to or substantially parallel to the wall height column 50. As a result, in order to rotate the longitudinal drive pulley 32 and the lateral drive pulley 22 along a plane perpendicular or substantially perpendicular to the wall rail 50, the width of the work area needs to be increased, compared with the case where It is possible to narrow the installation width in the width direction of the directional drive pulley 32 and the lateral drive pulley 22, and the concrete wall cutting device 10 can be compactly arranged in a work area that is kept narrow. .

  As shown in FIG. 3, in the present embodiment, the longitudinal tension portion 33 is arranged as at least a pair of longitudinal tension pulleys 33 a and 33 b, for example, by overlapping three bodies (see FIG. 2) and having a diameter of about 200 mm to 220 mm. A lower fixed vertical tension pulley 33a having a size and two upper moving vertical tension pulleys 33b having a size of about 200 mm to 220 mm, which are arranged in layers (see FIG. 2), are configured. As a result, the longitudinal cutting wire saw 31 is wound around the longitudinal tension portion 33 so as to be doubled (see FIGS. 1 and 2).

  For example, in the vertical tension box 33d, the lower fixed vertical tension pulley 33a is configured such that the rotation shaft 33c is disposed in a lateral direction L that is perpendicular or substantially perpendicular to the drive rotation shaft 41, and its height position (position in the longitudinal direction H). ) Is fixed and is rotated along a plane perpendicular or substantially perpendicular to the wall height column 50.

  For example, in the vertical tension box 33d, the upper moving vertical tension pulley 33b is arranged with the rotation shaft 33e slightly inclined with respect to the rotation shaft 33c of the lower fixed vertical tension pulley 33a (see FIG. 1), for example, It is attached in such a manner that its position can be moved up and down by the action of a known hydraulic jack. Similarly to the lower fixed vertical tension pulley 33a, the upper moving vertical tension pulley 33b rotates along a plane perpendicular or substantially perpendicular to the wall height column 50, and the rotation shaft 33c is connected to the lower fixed vertical tension pulley 33a. One lower portion adjacent to the lower fixed vertical tension pulley 33a in which three longitudinally wound wire saws 31 are overlapped by being arranged slightly inclined with respect to the rotating shaft 33c. The fixed vertical tension pulley 33a can be stably fed out to the other lower fixed vertical tension pulley 33a.

  Further, the upper moving vertical tension pulley 33b is mounted so that its position can be moved up and down, so that it can move relative to the lower fixed vertical tension pulley 33a. As a result, the wire saw 31 for longitudinal cutting generated along with the cutting in the longitudinal direction H of the wall rail 50 by widening or narrowing the interval between the upper moving longitudinal tension pulley 33b and the lower fixed longitudinal tension pulley 33a. The cutting force by the longitudinal cutting wire saw 31 can be controlled by adjusting the tension of the longitudinal cutting wire saw 31 that is rotationally driven endlessly.

  In the present embodiment, the vertical cutting wire saw 31 is overlapped in the vertical tension portion 33 via three lower fixed vertical tension pulleys 33a and two upper moving vertical tension pulleys 33b. As a result of the movement of the upper moving longitudinal tension pulley 33b, the longitudinal cutting wire saw 31 is drawn in a length longer than the amount of movement, or a larger tension is applied to the longitudinal cutting wire saw 31. It can be applied efficiently in a stable state.

  In the present embodiment, the longitudinal feed or pull-out guide pulley 34 has a size of, for example, about φ200 mm to 220 mm, and the winding groove 34 a on the outer peripheral surface around which the vertical cutting wire saw 31 is wound, It arrange | positions in the state facing the wire penetration hole 51b formed in the position which should cut the wall height column 50 to the vertical direction H. FIG. As a result, the longitudinal cutting wire saw 31 that is continuously driven in an endless manner is smoothly pulled out from the wire insertion hole 51b and fed out smoothly into the wire insertion hole 51b. It becomes possible to guide the wire saw 31 in a stable state.

  In the present embodiment, as shown in FIG. 3, the longitudinal feed or pull-out guide pulley 34 is attached so as to be rotatable in the left-right direction around the rotation connecting portion 34c, so that the direction of the rotation shaft 34b is set. It is a conversion type pulley that can be converted in the left-right direction. The longitudinal feed or pull-out guide pulley 34 is a conversion pulley, so that the longitudinal direction continuously rotated in an endless manner as the cutting of the wall rail 50 by the longitudinal cutting wire saw 31 progresses. It becomes possible to cut the wall height column 50 in the vertical direction H in a more stable state by absorbing the positional deviation of the track of the wire saw 31 for cutting.

  Furthermore, in this embodiment, as shown in FIG. 3, in the longitudinal feed or pull-out guide pulley 34, the lowermost end portion of the winding groove 34a is higher than the height position of the top surface portion of the wire insertion hole 51b. It is arranged below. Thus, the cutting force can be reduced by preventing the longitudinally cutting wire saw 31 that continuously rotates endlessly and cuts the wall rail 50 from contacting the portion other than the outer corner portion of the top surface portion of the wire insertion hole 51b. It is possible to cut the wall height column 50 in the vertical direction H more smoothly.

  The longitudinal cutting wire saw 31 is wound endlessly around the longitudinal driving pulley 32, the lower fixed longitudinal tension pulley 33a and the upper moving longitudinal tension pulley 33b of the longitudinal tension portion 33, and the longitudinal feed or pull-out guide pulley 34. The plurality of longitudinal guide pulleys 35a, 35b, 35c, 35d, and 35e that are guided to be rotated have a size of about φ200 mm to 220 mm, for example. The first longitudinal guide pulley 35a is adjacent to the downstream side in the drive direction of the longitudinal drive pulley 32, and the rotational axis is arranged in the longitudinal direction H, and is the same as the height position of the upper end portion of the longitudinal drive pulley 32. The wire saw 31 for cutting in the vertical direction, which is sent from the vertical driving pulley 32 and substantially parallel to the extending direction of the wall height column 50 (lateral direction L), is changed in direction so as to go to the wall height column 50. Thus, it can be sent out in the width direction W.

  The second longitudinal guide pulley 35b is adjacent to the downstream side in the driving direction of the first longitudinal guide pulley 35a, and directly upstream of the lower fixed longitudinal tension pulley 33a of the longitudinal tension portion 33 in the upstream side in the driving direction. In the state where the rotary shaft is arranged in the horizontal direction L, the vertical cutting wire saw 31 fed from the first vertical guide pulley 35a toward the wall height column 50 is transferred to the upper vertical tension portion 33. The direction can be changed so as to be directed and sent in the vertical direction H.

  The third longitudinal guide pulley 35c is disposed on the downstream side in the driving direction at a portion directly below the lower fixed longitudinal tension pulley 33a of the longitudinal tension portion 33, and the rotation shaft is disposed in the lateral direction L in the longitudinal direction. The longitudinal cutting wire saw 31 sent out downward from the direction tension part 33 can be sent out by changing the direction so as to go to the wall height column 50.

  The fourth longitudinal guide pulley 35d is disposed adjacent to the downstream side in the driving direction of the longitudinal feed or pull-out guide pulley 34, and in the state where the rotation shaft is disposed in the lateral direction L, the vertical feed or pull-out guide pulley. The wire saw 31 for cutting in the longitudinal direction fed upward from 34 is changed in direction so as to go away from the wall height column 50 at a height position similar to the height position of the lower end portion of the longitudinal drive pulley 32. Thus, it can be sent out in the width direction W.

  The fifth vertical guide pulley 35e is disposed adjacent to the downstream side in the driving direction of the fourth vertical guide pulley 35d, and the wall of the wall is adjusted by the fourth vertical guide pulley 35d in a state where the rotation shaft is disposed in the vertical direction H. The vertical cutting wire saw 31 fed in a direction away from the vertical direction 50 is extended from the vertical direction driving pulley 32 to the wall height column 50 at a height position similar to the height position of the lower end portion of the vertical direction driving pulley 32. The direction is changed so as to go in the lateral direction L substantially parallel to the direction, and the feed can be sent out toward the longitudinal drive pulley 32.

  As a result, as shown in FIG. 5, the vertical cutting wire saw 31 of the vertical rotation drive mechanism 30 extends from the front side of the wall height column 50 (the side on which the concrete wall cutting device 10 is located) to the back side. Can be arranged in an endless manner in a state where the wire is wound so as to be cut in the vertical direction H.

  Specifically, the longitudinal drive pulley 32 connected to the drive motor 42 will be described as a starting point. By being guided by the longitudinal drive pulley 32 disposed in the vicinity of the drive motor 42, a wire saw for longitudinal cutting is provided. 31 is in a state of being sent out in the lateral direction L parallel to or substantially parallel to the wall height column 50, and is guided by the first longitudinal guide pulley 35a located on the downstream side in the drive direction of the longitudinal drive pulley 32. The direction is changed in the width direction W from the lateral direction L toward the wall height column 50. Thereafter, the longitudinal cutting wire saw 31 is guided to the longitudinal tension portion 33 by the second longitudinal guide pulley 35b located downstream in the driving direction of the first longitudinal guide pulley 35a, whereby the longitudinal tension portion 33. Thus, the tension is adjusted and the cutting force by the longitudinal cutting wire saw 31 is controlled.

  A third longitudinal guide pulley 35c is disposed downstream of the longitudinal tension portion 33 in the driving direction, and the longitudinal cutting wire saw 31 is connected to the upper end portion of the wall rail 50 via the third longitudinal guide pulley 35c. Will be guided to the back side. The longitudinal cutting wire saw 31 guided to the back side of the wall rail 50 is inserted into a wire insertion hole 51b formed at the bottom of the ground cover 50b of the wall rail 50, and is positioned in front of the wire insertion hole 51b. It is pulled back to the front side via the feed or pull-out guide pulley 34. At this time, the longitudinal feed or pull-out guide pulley 34 is rotatably attached via the rotary connecting portion 34c so that the direction of the rotation shaft can be changed, so that the longitudinal cutting through the wire insertion hole 51b is performed. By changing the position according to the position of the wire saw 31, the longitudinal cutting wire saw 31 can be pulled back stably.

  The longitudinal cutting wire saw 31 pulled back to the front side is guided upward by a fourth longitudinal guide pulley 35d disposed on the downstream side in the transport direction of the longitudinal delivery or withdrawal guide pulley 34, thereby The drive pulley 32 moves to the lower end position. A fifth vertical guide pulley 35e is disposed on the downstream side in the transport direction of the fourth vertical guide pulley 35d, and the vertical cutting wire saw 31 is connected to the vertical drive pulley by the fifth vertical guide pulley 35e. The direction is changed in the lateral direction L toward the lower end position. In this state, the longitudinally cutting wire saw 31 is wound around each pulley of the longitudinal rotation drive mechanism 30 and is capable of cutting the wall height column 50 in the longitudinal direction.

  As shown in FIGS. 6 and 7, the lateral rotation drive mechanism 20 constituting the concrete wall cutting apparatus 10 of the present embodiment includes a lateral drive pulley 22 and at least a pair of lateral tension pulleys 23a and 23b. A direction tension portion 23, a lateral feed or pull-out guide pulley 24 disposed with the winding groove 24a facing the wire insertion hole 51b, and a plurality of lateral guide pulleys 25a, 25b, 25c, 25d, and 25e. It is configured to include. These pulleys 22, 23 a, 23 b, 24, 25 a, 25 b, 25 c, 25 d, 25 e are supported by the above-described support frame 45 to which the vertical rotation drive mechanism 30 is attached, and the transverse cutting wire saw 21 is endless. In a state in which the rotation shaft is arranged in a predetermined direction suitable for being wound in a shape, it is rotatably attached.

  The lateral drive pulley 22 is provided as a main pulley having a size of about φ400 mm, for example, and is connected to the drive motor 42 of the drive unit 40 together with the longitudinal drive pulley 32 of the longitudinal rotation drive mechanism 30 described above. . The lateral drive pulley 22 is synchronized with the longitudinal drive pulley 32 around the rotational drive shaft 41 arranged in the width direction W perpendicular or substantially perpendicular to the wall height column 50 by the drive of the drive motor 42 of the drive unit 40. And can be rotated. The lateral drive pulley 22 is mounted so as to be rotatable about the rotary drive shaft 41, so that the horizontal drive pulley 22 rotates along a plane parallel or substantially parallel to the wall height column 50. As a result, in order to rotate the lateral drive pulley 22 along a plane perpendicular or substantially perpendicular to the wall height column 50, the lateral drive pulley 22 and the longitudinal drive pulley 22 are compared with the case where it is necessary to increase the width of the work area. The installation width in the width direction of the direction driving pulley 32 can be reduced, and the concrete wall cutting device 10 can be arranged in a compact manner in a work area where the width is fixed.

  As shown in FIG. 6, in the present embodiment, for example, four lateral tension portions 23 are arranged as at least a pair of lateral tension pulleys 23 a and 23 b in an overlapping manner (see FIG. 7) and have a diameter of about 200 mm to 220 mm. A lower fixed lateral tension pulley 23a having a size and three upper moving lateral tension pulleys 23b having a size of about 200 mm to 220 mm, which are arranged in a stacked manner (see FIG. 7), are configured. In the present embodiment, the transverse cutting wire saw 21 has the lateral tension portion 23 in a state where it is left without using the lower fixed lateral tension pulley 23a and the upper moving lateral tension pulley 23b arranged on the innermost side. In FIG. 1, it is wound so as to overlap twice (see FIGS. 1 and 2).

  For example, in the lateral tension box 23d, the lower fixed lateral tension pulley 23a has a rotation shaft 23c arranged in a width direction W parallel or substantially parallel to the drive rotation shaft 41, and its height position (position in the vertical direction H). ) Is fixed and is rotated along a plane parallel to or substantially parallel to the wall height column 50.

  For example, in the lateral tension box 23d, the upper moving lateral tension pulley 23b is arranged by slightly tilting the rotation shaft 33e with respect to the rotation shaft 33c of the lower fixed lateral tension pulley 23a (see FIG. 1). It is attached in such a manner that its position can be moved up and down by the action of a known hydraulic jack. Similar to the lower fixed lateral tension pulley 23a, the upper moving lateral tension pulley 23b rotates along a plane parallel or substantially parallel to the wall height column 50, and the rotating shaft 23e is connected to the lower fixed lateral tension pulley 23a. By being disposed slightly inclined with respect to the rotating shaft 23c, the adjacent one of the lower fixed lateral sides of the lower fixed lateral tension pulley 23a disposed to overlap the wound transverse cutting wire saw 21 is overlapped. The directional tension pulley 23a can be stably fed out to the other lower fixed lateral tension pulley 23a.

  Further, the upper moving lateral tension pulley 23b is mounted so as to be movable up and down, so that it can move relative to the lower fixed lateral tension pulley 23a. As a result, the distance between the upper moving lateral tension pulley 23b and the lower fixed lateral tension pulley 23a is increased or decreased, so that the transverse cutting wire saw 21 generated along with the horizontal cutting of the wall rail 50 can be performed. The cutting force by the transverse cutting wire saw 21 can be controlled by absorbing the looseness or adjusting the tension of the transverse cutting wire saw 21 that rotates endlessly.

  In the present embodiment, the transverse cutting wire saw 21 is wound in the lateral tension portion 23 so as to overlap with each other via the lower fixed lateral tension pulley 23a and the upper moving lateral tension pulley 23b. Thus, by moving the upper moving lateral tension pulley 23b, the transverse cutting wire saw 21 is drawn in a length longer than the moving amount, or a larger tension is efficiently applied to the transverse cutting wire saw 21 in a stable state. Or can be granted.

  In the present embodiment, the lateral feed or pull-out guide pulley 24 has a size of, for example, about φ200 mm to 220 mm, and the winding groove 24 a on the outer peripheral surface around which the transverse cutting wire saw 21 is wound, As a length to cut the wall height column 50 in the lateral direction L, for example, a pair is arranged in a state of facing the pair of wire insertion holes 51a, 51b formed at the bottom of the wall height column 50 with an interval of 2 m, for example. The As a result, the transverse cutting wire saw 31 that is continuously rotated in an endless manner is smoothly pulled out from the wire insertion holes 51a and 51b, or is smoothly sent out to the wire insertion holes 51a and 51b. It becomes possible to guide the wire saw 21 for horizontal cutting in a stable state.

  Further, in the present embodiment, as shown in FIG. 6, the pair of lateral delivery or drawer guide pulleys 24 are attached to each other so as to be rotatable in the left-right direction via the rotation connecting portion 24c. This is a conversion pulley capable of changing the direction of the shaft 24b. Since the longitudinal feed or pull-out guide pulley 24 is a conversion pulley that can rotate in the left-right direction, it is continuously endlessly generated as the wall rail 50 is cut by the transverse cutting wire saw 21. Thus, it is possible to absorb the positional deviation of the trajectory of the rotating horizontal cutting wire saw 21 and cut the wall height column 50 in the horizontal direction in a more stable state.

  A transverse cutting wire saw 21 is wound endlessly around a lateral drive pulley 22, a lower fixed lateral tension pulley 23 a and an upper moving lateral tension pulley 23 b of a lateral tension portion 23, and a lateral feed or pull-out guide pulley 24. The plurality of lateral guide pulleys 25a, 25b, 25c, 25d, and 25e that are guided to be rotated have a size of about φ200 mm to 220 mm, for example. The first lateral guide pulley 25a is adjacent to the downstream side in the driving direction of the lateral tension box 23d, and the height position of the lower end portion of the lower fixed lateral tension pulley 23a in a state where the rotation shaft is disposed in the longitudinal direction H. The horizontal cutting wire saw 21 fed from the lateral drive pulley 22 substantially parallel to the extending direction of the wall height column 50 (lateral direction L) is directed toward the wall height column 50. The direction can be changed and sent out in the width direction W.

  The second lateral guide pulley 25b is disposed adjacent to the first lateral guide pulley 25a on the downstream side in the driving direction thereof, and the lateral feed or pull-out guide pulley with the rotation shaft disposed in the lateral direction. 24 is arranged upstream in the driving direction. The second lateral guide pulley 25b changes the direction of the transverse cutting wire saw 21 that has been directionally changed in the width direction W by the first lateral guide pulley 25 so as to be directed downward, and is supplied in a lateral direction or pulled out. It can be sent out to the pulley 24.

  The third lateral guide pulley 25c is disposed on the downstream side in the driving direction immediately above the lateral feed or pull-out guide pulley 24, and the horizontal feed or pull-out guide pulley is in a state where the rotation shaft is horizontal. The transverse cutting wire saw 21 sent out from 24 is changed in direction so as to go away from the wall height column 50 and can be sent out in the width direction W.

  The fourth lateral guide pulley 25d is disposed adjacent to the width direction W of the third lateral guide pulley 25d and on the downstream side in the driving direction of the third lateral guide pulley 25d. The transverse cutting wire saw 21 fed in the width direction W by the direction guide pulley 25c is changed in direction so as to go to the lateral drive pulley 22 and can be sent out in the lateral direction L.

  The fifth lateral guide pulley 25e is disposed adjacent to the lateral direction L of the fourth lateral guide pulley 24d and downstream in the driving direction thereof, and the fourth lateral guide pulley 25e is disposed in a state where the rotation shaft is disposed in the lateral direction. The transverse cutting wire saw 21 fed in the lateral direction L from the pulley 24d can be fed toward the lateral driving pulley 22 in a state without slack.

  Accordingly, as shown in FIG. 7, the transverse cutting wire saw 21 of the transverse rotational drive mechanism 20 is inserted through the pair of wire insertion holes 51a and 51b formed in the bottom of the wall height column 50, and the front side (concrete From the side where the wall cutting device 10 is located) to the back side, the wall height column 50 can be arranged endlessly in a state of being wound so as to be cut in the lateral direction Y.

  More specifically, the lateral drive pulley 22 connected to the drive motor 42 will be described as a starting point. By being guided by the lateral drive pulley 22 disposed in the vicinity of the drive motor 42, a wire saw for transverse cutting is used. 21 is in a state of being sent out in a lateral direction L that is parallel or substantially parallel to the wall height column 50. The transverse cutting wire saw 21 sent out by the lateral drive pulley 22 is guided by the lateral tension portion 23 located downstream in the drive direction of the lateral drive pulley 22, so that the tension in the lateral tension portion 23 is increased. The cutting force by the transverse cutting wire saw 21 is controlled.

  A first lateral guide pulley 25a is arranged on the downstream side in the driving direction of the lateral tension portion 23, and the wire saw 11 for cutting in the lateral direction is inserted into a wire insertion hole in the lateral direction L by the first lateral guide pulley 25a. It is guided to the position where 51a is formed. Thereafter, the transverse saw wire saw 11 was changed in direction by the second transverse guide pulley 25b located adjacent to the first transverse guide pulley 25a and on the downstream side in the driving direction, and guided downward. Later, it is guided in the width direction W toward the wire insertion hole 51a by the lateral feed or pull-out guide pulley 24 located on the downstream side in the transport direction of the second lateral guide pulley 25b, and the wall column through the wire insertion hole 51a. 50 is inserted through the back side.

  The transverse cutting wire saw 11 inserted through the wire insertion hole 51a and reaching the back side of the wall rail 50 is inserted into the other wire insertion hole 51b through the back side of the wall height column 50, and the other wire insertion hole 51b is inserted. It is pulled back to the front side by a lateral feed or pull-out guide pulley 24 located in the front. At this time, the lateral feed or pull-out guide pulleys 24 and 24 positioned in front of the pair of wire insertion holes 51a and 51b can be rotated through the rotation connecting portion 24c so that the direction of the rotation shaft can be changed. For example, according to the position of the transverse cutting wire saw 21 inserted into each of the pair of wire insertion holes 51a and 51b as the cutting progresses, the lateral feed or pull-out guide pulley 24 is attached. , 24 rotate, the transverse cutting wire saw 21 can be pulled back stably.

  The horizontal cutting wire saw 21 pulled back to the front side is adjacent to the lateral feed or pull-out guide pulley 24 and is positioned on the downstream side in the driving direction by a vertical guide pulley 25c disposed on the upper side. Direction toward the lateral drive pulley 22 through a fourth longitudinal guide pulley 25d newly provided in the third longitudinal guide pulley 25c and positioned downstream in the drive direction, guided in the width direction W away from the rail 50 Converted. The transverse cutting wire saw 21 whose direction has been changed toward the lateral driving pulley 22 passes through a fifth longitudinal guide pulley 25e located adjacent to the fourth longitudinal guide pulley 25d and downstream in the driving direction thereof, The lateral drive pulley 22 is guided in the lateral direction L toward the lower end position. The wire saw 31 for horizontal cutting is wound around each pulley of the horizontal rotation driving mechanism 20 in such a state, and the wall height column 50 can be cut in the horizontal direction.

  When the wall height column 50 is cut and removed using the concrete wall cutting device 10 having the above-described configuration, the cutting position of the wall height column 50 to be cut and removed is measured in advance before performing the cutting and removal. A plurality of wire insertion holes 51 through which the horizontal cutting wire saw 21 and the vertical cutting wire saw 31 are inserted are punched in the 50 ground covering portions 50b at predetermined pitches. In the present embodiment, for example, a plurality of wire insertion holes 51 are drilled at a pitch of about 2 m using a known concrete drilling device. At this time, based on the positions of the plurality of perforated wire insertion holes 51, the place where the concrete cutting device 10 is arranged when the wall rail 50 is cut is also positioned and marked. In this embodiment, it is good to carry out with the pitch of about 2 m like the above-mentioned perforation space | interval of the wire penetration hole 51, for example.

  Next, the concrete wall cutting device 10 is carried in. As shown in FIGS. 1 and 2, the support base of the concrete wall cutting apparatus 10 includes a pulley support base 45 a that supports each pulley, a drive motor 42, a lateral drive pulley 22, and a drive that supports the longitudinal drive pulley 32. First, the pulley support frame 45a is installed and fixed in a pre-positioned position. The drive unit support base 45b is provided with wheels, and is arranged so as to be positioned in series in the lateral direction L with respect to the fixed drive unit support base 45b and connected thereto. When installing the pulley support frame 45a, the pulley support frame 45a is installed while checking the level and verticality of the pulley support frame 45a. Each pulley supported by the pulley support frame 45a may be carried in a state in which the pulley is supported in advance by the pulley support frame 45a. Alternatively, the pulley support frame 45a may be incorporated at the site after loading.

  When the pulley support frame 45a and the drive unit support frame 45b are installed, next, the horizontal direction cutting drive mechanism 20 and the horizontal direction cutting wire saw 21 and the vertical direction cutting wire saw 31 including the wall rail 50 are included. It is wound around the vertical rotation drive mechanism 30. The transverse cutting wire saw 21 and the longitudinal cutting wire saw 31 are wound so as to be in the above-described winding state. At this time, the longitudinal driving pulley 32 is disposed inside the lateral driving pulley 22 (on the wall height rail 50 side) with respect to the existing wall height rail 50, and the transverse cutting wire saw 21, the longitudinal cutting wire saw 31, and the like. Can be arranged without crossing each other when viewed from above. Therefore, either when the longitudinal cutting wire saw 31 is wound after the transverse cutting wire saw 21 is wound or when the transverse cutting wire saw 21 is wound after the longitudinal cutting wire saw 31 is wound. Even in this case, these wire saws 21 and 31 can be wound endlessly easily and efficiently.

  After winding the transverse cutting wire saw 21 and the longitudinal cutting wire saw 31, contact points between the transverse cutting wire saw 21 and the longitudinal cutting wire saw 31 and the pair of wire insertion holes 51 a and 51 b are confirmed. Then, the initial resistance between the horizontal cutting wire saw 21 and the vertical cutting wire saw 31 and the pair of wire insertion holes 51a and 51b when the horizontal rotation driving mechanism 20 and the vertical rotation driving mechanism 30 are driven is reduced. For this reason, at the contact point between the pair of wire insertion holes 51a and 51b, the wire saw 21 for horizontal cutting and the wire saw 31 for vertical cutting are moved a plurality of times in the moving direction by, for example, manual operation, and resistance at the contact point Reduce.

  When these are completed, peripheral devices such as a dust collector are installed, and an air hose, a dust collecting hose, a power cord, and the like are connected. Next, the whole cover (not shown) is fixed and a test run is performed. During the trial operation, the moving direction of the transverse cutting wire saw 21 and the longitudinal cutting wire saw 31 is confirmed by checking the rotation direction of each pulley. Next, a safety cover or the like such as a peripheral device (not shown) is installed, and a safety fence, a protective net, or the like is installed on the breaking line of the lateral rotation drive mechanism 20 and the vertical rotation drive mechanism 30.

  When these are finished, the operation of the concrete wall cutting apparatus 10 is started. First, only the vertical rotation driving mechanism 30 is driven for a predetermined time, and the wall height column 50 is cut in the vertical direction H. Next, only the horizontal rotation drive mechanism 20 is driven for a predetermined time, and the wall rail is cut in the horizontal direction L. When driving for each of the vertical rotation driving mechanism 30 and the horizontal rotation driving mechanism 20 for a predetermined time is completed, the vertical rotation driving mechanism 30 and the horizontal rotation driving mechanism 20 are driven simultaneously, and the wall height column 50 is moved in the vertical direction H and the horizontal direction. In the direction L, the L-shape is cut simultaneously in the vertical and horizontal directions.

  When the wall rail 50 is cut by about two thirds, the vertical rotation driving mechanism 30 and the horizontal rotation driving mechanism 20 are temporarily stopped, and the cutting is performed by cutting with the horizontal cutting wire saw 21 and the vertical cutting wire saw 31. Wedge is driven into the groove. Thereafter, the vertical rotation driving mechanism 30 and the horizontal rotation driving mechanism 20 are simultaneously driven again. Then, when the cutting of either the vertical direction H or the horizontal direction L of the wall height column 50 is completed, the vertical direction rotation drive mechanism 30 and the horizontal direction rotation drive mechanism 20 are stopped, and the wire saw in the completed direction is removed. The longitudinal direction rotational drive mechanism 30 and the lateral direction rotational drive mechanism 20 that have not been cut are driven again to complete the cutting of the wall height column 50. In the present embodiment, using a known clutch mechanism, the driving force of the drive motor is connected only to the longitudinal rotation drive mechanism 30 or the lateral rotation drive mechanism 20 that has not been disconnected, and the disconnection is completed. The longer longitudinal rotation drive mechanism 30 or the lateral rotation drive mechanism 20 can be driven.

  When the cutting of the wall rail 50 is completed, the power supply of peripheral devices and the like is stopped, and the power supply of the concrete wall cutting device 10 is also temporarily stopped. Then, remove the safety fence and safety cover. In the present embodiment, when the cutting and removal at one place is completed, the concrete wall cutting device 10 is moved to the position of the next wall height column 50, preferably leaving the wall height column 50 having the same interval as the cut wall height column 50, and the above-mentioned. The same cutting and removal is performed. In other words, in this embodiment, the wall height column to be extended is cut and removed while leaving the existing wall height column 50 having the same length as the wall height column 50 to be cut. Then, when the cutting and removal of the single wall height column 50 in the removal range is completed, the remaining wall height column is sequentially cut and removed.

  In this way, by removing the wall rail 50 in a single step, for example, when the cutting and removal work of the removal range is not completed, it becomes possible to connect the remaining wall rails with a guard rail or the like, and cutting In the removal work process, it is possible to prevent the occurrence of a portion where the wall rail is eliminated. For example, even when a state where the work cannot be performed occurs, it is possible to prevent the occurrence of a portion where the wall rail is eliminated by performing the work of installing the above-described guard rail and the like in advance.

  And according to this embodiment, by using the concrete wall cutting device 10 having the above-described configuration, the concrete wall continuous over a considerable length in the extending direction is longitudinal along the height direction. It becomes possible to simultaneously cut in the horizontal direction (extending direction) L along H and L in the L-shape in parallel with the vertical and horizontal directions, and the concrete wall can be efficiently disassembled.

  In particular, even in a place where the concrete wall is the wall height column 50 and it is necessary to perform the cutting work in a state where the road is used while regulating the lane, it is possible to perform the work while keeping the work area narrow. Therefore, it is possible to perform work while the road is in service. Moreover, since the wall height column 50 can be cut simultaneously in the vertical and horizontal directions by the single concrete wall cutting device 10, work efficiency can be improved and the work period can be shortened.

  Furthermore, since the concrete wall cutting device 10 can drive the lateral direction rotational drive mechanism 20 and the longitudinal direction rotational drive mechanism 30 with one drive motor 42, the size of the device can be reduced. The lateral drive pulley 22 and the longitudinal drive pulley 32 to which the drive motor 42 is connected are arranged so as to rotate along a plane parallel to or substantially parallel to the wall height column 50 and toward the wall height column 50. Since the longitudinal direction guide pulleys 35a and 35e and the lateral direction guide pulleys 25a and 25e that change the direction of the longitudinal direction cutting wire saw 31 and the lateral direction cutting wire saw 21 are provided, the length in the width direction W can be shortened. It becomes possible, and it becomes possible to work safely and efficiently by keeping the work area in a narrow place, for example, the width of one lane of the expressway.

  As described above, according to the concrete wall cutting apparatus 10 of the present embodiment, the work area can be kept narrow without using a heavy machine for crushing such as a breaker. The concrete wall can be demolished efficiently without affecting the concrete wall.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the lateral feed or drawer guide pulley does not necessarily have to be rotatably mounted so that the direction of the rotation axis is variable, and the longitudinal drive pulley is driven laterally with respect to the existing concrete wall. It may be arranged outside the pulley. The existing concrete wall cut by the concrete wall cutting device of the present invention may be other various concrete walls that are continuously installed in the extending direction other than the concrete wall rail.

DESCRIPTION OF SYMBOLS 10 Concrete wall cutting apparatus 20 Lateral rotation drive mechanism 21 Wire saw 22 for horizontal cutting Horizontal drive pulley 23a Lower fixed lateral tension pulley 23b Upper movement lateral tension pulley 23c, 23e Rotating shaft 25a 1st lateral guide pulley 25b 1st 2 lateral guide pulley 25c 3rd lateral guide pulley 25d 4th lateral guide pulley 25e 5th lateral guide pulley 30 longitudinal rotation drive mechanism 31 longitudinal cutting wire saw 32 longitudinal drive pulley 33a lower fixed longitudinal guide pulley 33b Upper moving vertical guide pulleys 33c, 33e Rotating shaft 35a First vertical guide pulley 35b Second vertical guide pulley 35c Third vertical guide pulley 35d Fourth vertical guide pulley 35e Fifth vertical guide pulley 40 Drive unit 41 Drive shaft 42 Motor 50 walls railings 51a wire insertion hole H lengthwise direction L lateral direction W transverse direction

JP-A-6-93651

Claims (5)

A concrete wall cutting device used for cutting and dismantling and removing existing concrete walls that are continuously installed in the extending direction at predetermined lengths using a wire saw,
By providing the horizontal rotation drive mechanism and the vertical rotation drive mechanism, the horizontal cutting wire saw and the vertical cutting wire saw are simultaneously driven endlessly to rotate the existing concrete wall in the horizontal direction and the vertical direction. It can be cut in parallel,
The lateral rotation drive mechanism and the longitudinal rotation drive mechanism are laterally rotatable synchronously around a rotation drive shaft arranged in a direction perpendicular or substantially perpendicular to an existing concrete wall by driving of a drive unit. Each equipped with a directional drive pulley or a longitudinal drive pulley,
The lateral rotation drive mechanism includes a lateral tension portion including the lateral drive pulley and at least a pair of laterally movable tension pulleys that rotate about a rotational axis that is parallel or substantially parallel to the drive rotational shaft. And a lateral feed or pull-out guide pulley respectively disposed with a winding groove facing a pair of wire insertion holes formed penetrating an existing concrete wall, and these pulleys for the transverse cutting A plurality of lateral guide pulleys for guiding the wire saw so as to be wound endlessly,
The longitudinal rotation drive mechanism includes a longitudinal tension unit including the longitudinal drive pulley and at least a pair of longitudinal tension pulleys that rotate about a rotation axis that is perpendicular or substantially perpendicular to the drive rotation shaft. And a longitudinal feed or pull-out guide pulley disposed with a winding groove facing one of the pair of wire insertion holes formed through the existing concrete wall, and the longitudinal direction of these pulleys A concrete wall cutting device comprising a plurality of longitudinal guide pulleys for guiding a cutting wire saw to be wound endlessly.   2. The concrete wall cutting apparatus according to claim 1, wherein the lateral feed or pull-out guide pulley is rotatably attached via a rotation connecting portion so that the direction of the rotation shaft is variable.   3. The concrete wall cutting device according to claim 1, wherein only one of the lateral drive pulley and the longitudinal drive pulley is connected to the drive unit so as to be rotatable.   The concrete wall cutting device according to any one of claims 1 to 3, wherein the longitudinal drive pulley is disposed inside the lateral drive pulley with respect to an existing concrete wall.   The concrete wall cutting device according to any one of claims 1 to 4, wherein the existing concrete wall is a concrete wall rail installed along a side edge of a concrete floor slab.