JP7803783B2 - Structural member cutting device and structural member cutting method - Google Patents

Description

The present invention relates to a structural member cutting device and a structural member cutting method.

Traditionally, methods for demolishing SRC or RC structures have involved using large crushing machinery installed on the ground, or placing multiple crushers or breakers on the work floor to crush the structure on the upper floors. Among these methods, the demolition of foundation frameworks such as foundation beams and mat slabs generates particularly large amounts of vibration and noise, and has long been a major environmental problem.

As a method for solving the above problems, for example, Patent Documents 1 and 2 propose a method for demolishing foundation beams, mat slabs, etc. by cutting them horizontally on the underside using a wire saw that is wrapped around multiple pulleys in an endless loop and rotates in a circular motion.

JP 2019-111768 A Japanese Patent Application Laid-Open No. 2019-123168

However, with the above method, the maximum applicable width of cutting objects such as foundation beams and mat slabs is approximately 2,400 mm, and depending on the conditions, such as the span of multiple foundation beams exceeding that width, it may be necessary to further subdivide the cutting area from the cutting object and increase the number of cuts required for demolition.

The present invention therefore aims to provide a structural member cutting device and a structural member cutting method that can expand the cuttable width of structural members.

To achieve the above-mentioned objectives, the structural member cutting device of the present invention comprises a wire saw for cutting structural members, a plurality of first guide pulleys and a plurality of second guide pulleys for winding the wire saw in an endless loop and circulating and rotating it, an expansion/contraction mechanism for expanding and contracting the second guide pulleys in the width direction of the structural member relative to the first guide pulley in accordance with the width of the structural member, and a drive unit for driving the first guide pulleys and the second guide pulleys, wherein the first guide pulley comprises a drive pulley for circulating and rotating the wire saw, and a take-up pulley for adjusting the length of the wire saw.

With the above configuration, the structural member cutting device can use the expansion/contraction mechanism to expand/contract multiple second guide pulleys relative to multiple first guide pulleys in the width direction of the structural member in accordance with the width of the structural member, thereby increasing the cuttable width of the structural member. For example, if the structural members are multiple foundation beams, the second guide pulleys can be positioned to straddle the foundation beams using the expansion/contraction mechanism, and the wire saw can be rotated in a circular motion to cut multiple foundation beams simultaneously.

The structural member cutting device according to the present invention may also include multiple third guide pulleys that maintain the cutting height of the wire saw.

With the above configuration, the structural member cutting device uses multiple third guide pulleys to maintain the cutting height of the wire saw, thereby suppressing deflection of the wire saw when cutting structural members and preventing damage to the wire saw caused by cutting through the crushed stone layer or ground below the structural member. Furthermore, because the cutting height of the wire saw can be maintained at a low position close to the bottom end of the structural member, it is possible to reduce the amount of post-processing required for remaining members, such as chipping and demolition of concrete remaining between the cut surface and the crushed stone layer, etc.

The structural member cutting device according to the present invention may also be equipped with a position adjustment mechanism that adjusts the positions of the multiple third guide pulleys.

With the above configuration, the structural member cutting device can easily adjust the positions of the multiple third guide pulleys depending on the cutting height of the structural member and the progress of cutting with the wire saw.

Furthermore, in the structural member cutting device according to the present invention, the position adjustment mechanism may be configured to adjust the positions of the multiple third guide pulleys in the height and width directions of the structural member.

With the above configuration, the structural member cutting device can adjust the positions of multiple third guide pulleys in the height and width directions of the structural member, making it easy to adjust the position of the third guide pulleys when cutting rectangular structural members.

The structural member cutting device according to the present invention may also include a support plate provided between the first guide pulley and the second guide pulley, and a support caster connected to the support plate and in contact with the surface of the structural member.

With the above configuration, the structural member cutting device can reinforce the rigidity of multiple second guide pulleys, which are expanded and contracted in the width direction of the structural member using support plates, thereby preventing misalignment of the second guide pulleys and the cutting position of the structural member using the wire saw. Furthermore, by providing support casters, the second guide pulleys can be easily expanded and contracted in the width direction.

The structural member cutting device according to the present invention may also include a fourth guide pulley that is positioned approximately in the center of the cutting width of the cutting position of the structural member and tensions the wire saw at the cutting position of the structural member, and a movement mechanism that is provided in the drive unit and moves the fourth guide pulley along the cutting direction of the structural member.

With the above configuration, the structural member cutting device can use the fourth guide pulley to tension the wire saw at the cutting position, more reliably preventing the wire saw from bending when cutting a structural member and allowing the structural member to be cut at the desired position.

In order to achieve the above-mentioned object, the method for cutting a structural member according to the present invention comprises a wire saw for cutting a structural member, a plurality of first guide pulleys and a plurality of second guide pulleys for winding the wire saw in an endless loop and circulating and rotating it, an expansion/contraction mechanism for expanding/contracting the plurality of second guide pulleys in the width direction of the structural member relative to the first guide pulley in accordance with the width of the structural member, and a drive unit for driving the plurality of first guide pulleys and the plurality of second guide pulleys, wherein the first guide pulley comprises a drive pulley for circulating and rotating the wire saw, and a take-up pulley for adjusting the length of the wire saw, and and a position adjustment mechanism for adjusting the position of the third guide pulleys. The second guide pulleys are expanded by the expansion/contraction mechanism to a width equal to or greater than the width span of the structural member, the wire saw is positioned at the tip of the cutting area of the structural member, and the third guide pulleys are positioned at the cutting height of the structural member on both sides of the width of the structural member. The drive unit drives the first guide pulleys and the second guide pulleys to rotate the wire saw in a circular motion, and the wire saw is pulled toward the cutting device and moved in the cutting direction to cut the structural member.

The above-described method for cutting a structural member allows the multiple second guide pulleys to be expanded by the expansion/contraction mechanism to a width greater than the width span of the structural member, thereby increasing the cuttable width of the structural member and positioning the wire saw at the optimal cutting width for the structural member to cut it.

To achieve the above-mentioned objective, the method for cutting a structural member according to the present invention includes a fourth guide pulley positioned approximately in the center of the cutting width of the cutting position of the structural member and tensioning the wire saw at the cutting position of the structural member; and a movement mechanism provided in the drive unit and moving the fourth guide pulley in the cutting direction of the structural member. The structural member may include multiple foundation beams, the multiple second guide pulleys are expanded by the expansion/contraction mechanism to span the multiple foundation beams, the wire saw is positioned at the ends of the cutting areas of the multiple foundation beams, the multiple third guide pulleys are positioned on both sides of the structural member in the width direction at the cutting height of the structural member, the fourth guide pulley is positioned between the multiple foundation beams and in the width direction center of the cutting area by the movement mechanism, and the drive unit drives the multiple first guide pulleys and the multiple second guide pulleys to rotate the wire saw in a circular motion, and the wire saw is pulled toward the cutting device and moved in the cutting direction to simultaneously cut the multiple foundation beams.

Using the above-mentioned structural member cutting method, the fourth guide pulley is positioned in the widthwise center of the cutting area, and multiple second guide pulleys are expanded using an expansion/contraction mechanism to span multiple foundation beams, allowing multiple foundation beams to be cut simultaneously with a wire saw.

The present invention provides a structural member cutting device and a structural member cutting method that can increase the cuttable width of structural members.

1 is a front view showing an example of a structural member cutting device according to an embodiment of the present invention. 1 is a plan view showing an example of a structural member cutting device according to an embodiment of the present invention. FIG. 3 is a view taken along an arrow A in FIG. 2 . FIG. 3 is a view taken along the arrow B in FIG. 2 .

The following describes an embodiment of a structural member cutting device and a structural member cutting method according to the present invention, with reference to the drawings. Note that the drawings used in the following description are schematic, and the ratios of length, width, and thickness may not be the same as those in the actual product and may be changed as appropriate.

The structural member cutting device 1 cuts the cutting area 2a to be cut in a large concrete structural member 2, such as a foundation beam or mat slab, which are arranged at regular intervals in one direction (hereinafter, "structural member cutting device 1" will be referred to as "cutting device 1"). The structural member 2 is erected in the height direction and extends in one direction. Hereinafter, the width direction of the structural member 2 will be referred to as the X direction, the length direction of the structural member 2 as the Y direction, and the height direction of the structural member 2 as the Z direction.

As shown in Figures 1 and 2, the cutting device 1 includes a wire saw 3, multiple first guide pulleys 4, multiple second guide pulleys 5, a drive unit 6, an expansion/contraction mechanism 7, a wire saw height holding device 8, and a movement mechanism 9. The cutting device 1 cuts the cutting area 2a by rotating the wire saw 3 in a circular motion.

The overall length of the wire saw 3 is constant except for slight expansion and contraction due to the elasticity of the material. The wire saw 3 is, for example, a well-known diamond wire.

The first guide pulley 4 includes a drive pulley 41, take-up pulleys 42a and 42b, and fixed pulleys 43a, 43b, 43c, and 43d. The second guide pulley 5 includes a pair of upper guide pulleys 51a and 51b and a pair of lower guide pulleys 52a and 52b.

The drive pulley 41, winding pulleys 42a and 42b, and fixed pulleys 43a, 43b, 43c, and 43d are arranged inside the drive unit 6. The drive unit 6 is stably arranged on the structural member 2. The drive unit 6 may also be arranged on the structural member 2 via a horizontal base or the like.

The drive pulley 41 is connected to the drive unit 6 via a shaft 410 extending along the Y direction. Driven by the drive unit 6, it rotates around the shaft 410 and transmits driving force to the wire saw 3. The shaft 410 passes through a through-hole 61a formed in the drive unit 6 and extending in the Z direction. Driven by the drive unit 6, the drive pulley 41 moves independently through the through-hole 61a along the Z direction to adjust the tension of the wire saw 3.

The winding pulleys 42a, 42b are connected to the drive unit 6 via a shaft 420 extending along the Y direction, and are driven to rotate about the shaft 420 in accordance with the circular rotation of the wire saw 3 driven by the drive unit 6. The shaft 420 passes through a through-hole 61b formed in the drive unit 6 and extending in the Z direction. Driven by the drive unit 6, the winding pulleys 42a, 42b move independently along the Z direction through the through-holes 61b, 61b, respectively. When the winding pulleys 42a, 42b move upward in the Z direction, they draw the wire saw 3 located outside the drive unit 6 into the drive unit 6, and when they move downward in the Z direction, they pull the wire saw 3 located inside the drive unit 6 out of the drive unit 6, thereby adjusting the length of the circulating wire saw 3 and suppressing deflection of the wire saw 3.

The fixed pulleys 43a, 43b, 43c, and 43d are positioned at a predetermined distance in the X direction below at least the drive pulley 41 and the take-up pulleys 42a and 42b, and are fixed within the drive unit 6 via a first fixed portion 61. The configuration of the first fixed portion 61 is not particularly limited, and it may, for example, be configured to be directly attached to the inside of the drive unit 6.

The pair of upper guide pulleys 51a, 51b and the pair of lower guide pulleys 52a, 52b are located outside the drive unit 6.

The expansion/contraction mechanism 7 comprises a pair of guide members 71, 71, a pair of stiffening members 72, 72, and a pair of height adjustment members 73, 73.

The pair of guide members 71, 71 are arranged so that the distance between them in the X direction can be expanded or contracted, and the length of the wire saw 3 is adjusted in accordance with the expansion or contraction of the pair of guide members 71, 71 in the X direction. Upper guide pulleys 51a, 51b are connected to the upper ends of the pair of guide members 71, 71 via connecting fittings 711, 711, respectively, so that they can rotate in the X direction around axes 712, 712. The upper guide pulleys 51a, 51b are each driven to rotate around the axis 712 in accordance with the circular rotation of the wire saw 3.

The pair of upper guide pulleys 51a, 51b are fixed so as to be parallel to each other in the X direction. Therefore, the upper guide pulleys 51a, 51b do not rotate around the guide members 71, 71, respectively.

The pair of stiffening members 72, 72 are each disposed between the guide member 71 and the drive unit 6, reinforcing the rigidity of the pair of guide members 71, 71 and the pair of height adjustment members 73, 73 and preventing deformation of each member. The stiffening member 72 includes a support plate 721 and a support caster 722 that extends downward in the Z direction from the support plate 721 and comes into contact with the upper surface 2c of the structural member 2. The pair of support casters 722, 722 rotate on the upper surface 2c in response to the expansion and contraction of the pair of guide members 71, 71, thereby smoothing the expansion and contraction movement of the expansion and contraction mechanism 7.

A pair of height adjustment members 73, 73 extend slidably up and down in the Z direction from the lower ends of the pair of guide members 71. Lower guide pulleys 52a, 52b are connected to the lower ends of the pair of height adjustment members 73, 73, respectively. By sliding the pair of height adjustment members 73, 73 up and down in the Z direction, the Z-direction positions of the pair of lower guide pulleys 52a, 52b are adjusted.

The pair of lower guide pulleys 52a, 52b are connected rotatably around axes 732, 732 via connecting fittings 731, 731 attached to the lower ends of a pair of height adjustment members 73, 73, respectively. The pair of lower guide pulleys 52a, 52b rotate around the guide members 71, 71, respectively. Specifically, the connecting fitting 731 is attached to the height adjustment member 73 so that it can rotate around the Z axis at the connection portion 733 with the lower guide pulley 52a (52b). Therefore, the pair of lower guide pulleys 52a, 52b are rotatable in a plan view when erected along the Z direction.

The pair of guide members 71, 71 and the pair of height adjustment members 73, 73 also function as fixing parts (second fixing parts) for the pair of upper guide pulleys 51a, 51b and the pair of lower guide pulleys 52a, 52b, respectively.

The wire saw height holding device 8 includes a fixed portion 81, a width adjustment portion (position adjustment mechanism) 82, a pair of third guide pulleys 83a, 83b, and a pair of height adjustment portions (position adjustment mechanisms) 84, 84. As shown in Figures 2 and 3, the wire saw height holding device 8 is disposed between the cutting device 1 and the tip 2b of the cutting region 2a. The material of the wire saw height holding device 8 is not particularly limited, and it may be formed, for example, from a lightweight metal material such as aluminum.

The fixing portion 81 of the wire saw height holding device 8 is fixed to the upper surface 2c of the structural member 2 and is positioned approximately in the center of the cutting area 2a in the X direction. The configuration of the fixing portion 81 is not particularly limited, and it may be fixed, for example, by driving a known steel anchor into the structural member 2. This configuration makes it easy to attach and remove the wire saw height holding device 8, reducing the amount of work required.

The width adjustment unit 82 is connected to the fixed unit 81, and its ends 82a, 82b are capable of expanding and contracting or sliding in the X direction. The width adjustment unit 82 expands and contracts or slides in the X direction to adjust the X-direction positions of the pair of third guide pulleys 83a, 83b.

A pair of height adjustment units 84, 84 are provided at the ends 82a, 82b of the width adjustment unit 82, respectively, and are capable of expanding and contracting or sliding in the Z direction. The pair of height adjustment units 84, 84 expand and contract or slide in the Z direction to adjust the Z-directional positions of the pair of third guide pulleys 83a, 83b.

The pair of third guide pulleys 83a, 83b are provided near the lower ends of the pair of height adjustment parts 84 provided at the ends 82a, 82b of the width adjustment part 82. The pair of third guide pulleys 83a, 83b are positioned so that the winding parts 831, 831 of the wire saw 3 protrude outward in the X direction from the width adjustment part 82 in a plan view.

The configuration of the width adjustment unit 82 and the height adjustment unit 84 is not limited, and may be, for example, a sliding mechanism that adjusts the position by sliding in the X and Z directions. Alternatively, the pair of third guide pulleys 83a, 83b may be connected to a member having a length equivalent to the spacing and height of the pair of third guide pulleys 83a, 83b, and the pair of third guide pulleys 83a, 83b may be positioned as desired.

As shown in FIGS. 2 and 4 , the movement mechanism 9 includes a length adjustment unit 91 and a height adjustment unit 92 .
The length adjustment unit 91 is a rod-shaped member extending from the drive unit 6 toward the tip 2b of the cutting region 2a and arranged along the Y direction. The fixed unit 81 is attached to the length adjustment unit 91. The fixed unit 81 is configured to be movable along the length adjustment unit 91 (along the Y direction). Alternatively, the fixed unit 81 may be fixed to the length adjustment unit 91, and the length adjustment unit 91 may be configured to be extendable or slidable along the Y direction. A height adjustment unit 92 is provided at the base end of the fixed unit 81 on the tip 2b side of the cutting region 2a. The height adjustment unit 92 is configured to be extendable or slidable in the Z direction relative to the length adjustment unit 91. A fourth guide pulley 93 is connected near the lower end of the height adjustment unit 92.

The fixed portion 81 adjusts the position of the fourth guide pulley 93 in the Y direction by sliding along the length adjustment portion 91. The height adjustment portion 92 adjusts the position of the fourth guide pulley 93 in the Z direction by expanding and contracting or sliding in the Z direction.

The configuration of the length adjustment unit 91 and height adjustment unit 92 is not limited, and may be, for example, a known hydraulic cylinder or a slide mechanism that adjusts the position by sliding in the X and Z directions.

The fourth guide pulley 93 is positioned approximately in the center of the cutting area 2a in the X direction when viewed from the front of the cutting device 1, and is positioned so that the winding portion 931 of the wire saw 3 protrudes outward in the Y direction from the height adjustment portion 92 when viewed from above.

The wire saw 3 is wound around each pulley in an endless loop, extending clockwise in FIGS. 1 and 2 from the drive pulley 41 to the fixed pulley 43a, upper guide pulley 51a, lower guide pulley 52a, third guide pulley 83a, fourth guide pulley 93, third guide pulley 83b, lower guide pulley 52b, upper guide pulley 51b, fixed pulley 43b, take-up pulley 42a, fixed pulley 43c, take-up pulley 42b, fixed pulley 43d, and back to the drive pulley 41. The wire saw 3 rotates cyclically as the drive unit 6 rotates the drive pulley 41. The length of the rotating wire saw 3 is adjusted by adjusting the Z-direction positions of the take-up pulleys 42a and 42b, thereby suppressing deflection of the wire saw 3. The winding direction and rotation direction of the wire saw 3 may be clockwise or counterclockwise.

Next, a method for cutting structural members using the above-mentioned cutting device 1 will be explained with reference to the drawings.

As shown in Figures 1 to 4, the structural members 2 are four foundation beams 21. The foundation beams 21 are spaced apart in the X direction and extend in the Y direction. In this embodiment, the cutting area 2a is a rectangular (cuboid) shape that encompasses the entire area of each foundation beam 21 in the X and Z directions and a portion of the area in the Y direction. The length between the outer ends 21a of the foundation beams 21, 21 located at both ends in the X direction is longer than the width in the X direction when the expansion/contraction mechanism 7 of the cutting device 1 is closed. The cutting area 2a is determined based on the expansion/contraction range of the expansion/contraction mechanism 7 of the cutting device 1 and the cutting capacity of the wire saw 3. The cutting width in the X direction of the cutting device 1 used in this embodiment is approximately 3.0 m to 4.0 m, for example, due to the expansion/contraction mechanism 7 expanding the pair of guide members 71, 71 and the pair of upper guide pulleys 51a, 51b in the X direction.

The cutting method of this embodiment comprises a first vertical cutting step, a horizontal cutting step, a second vertical cutting step, and a component cutting step. Each step is described below.

<First vertical cutting step>
The cutting device 1 is installed on the upper surface 2c of the structural member 2. The expansion/contraction mechanism 7 expands the pair of guide members 71, 71 so that the X-direction spacing between the pair of guide members 71, 71 approximately matches the X-direction width of the cutting region 2a. This expansion also expands the pair of upper guide pulleys 51a, 51b, the pair of lower guide pulleys 52a, 52b, and the pair of height adjustment members 73, 73 so that the X-direction spacing and the X-direction width of the cutting region 2a approximately match. In this state, the height adjustment members 73, 73 and the lower guide pulleys 52a, 52b are positioned above both ends of the cutting region 2a in the X direction. The drive unit 6 is driven to lower the pair of height adjustment members 73, 73 while rotating the wire saw 3 in a circular motion. The cutting height of the wire saw 3 is set slightly above the lower end 2d of the cutting region 2a (hereinafter referred to as the "lower cutting end 2e"). As a result of the above, the tip 2b and both X-direction side portions 2f, 2f of the cutting region 2a are pressed downward in the Z direction, and a cut groove 2g is formed in the Z direction. Note that this process is not limited to the above method, and for example, a method in which the tip 2b and both X-direction side portions 2f, 2f are pressed downward in the Z direction using a known road cutter may also be used.

<Horizontal cutting process>
Next, taking into consideration the size of the cutting area 2a, the drive unit 6 is positioned and fixed at the rear side in the Y direction relative to the cutting area 2a. The pair of lower guide pulleys 52a, 52b and the wire saw 3 are positioned at the lower cutting end 2e by adjusting their Z-direction positions using a pair of height adjustment members 73, 73. The movement mechanism 9 also advances the fourth guide pulley 93 toward the tip 2b and similarly positions it at the lower cutting end 2e. The fourth guide pulley 93 is positioned so as not to overlap with the foundation beams 21 in the Y direction. With the above configuration, the drive unit 6 rotates the drive pulley 41 to rotate the wire saw 3 in a circular motion, while the wire saw 3 wound between the lower guide pulleys 52a, 52b advances toward the Y-direction cutting device 1, cutting the multiple foundation beams 21 in the horizontal direction (longitudinal direction). The wire saw 3 adjusts the Z-direction positions of the winding pulleys 42a, 42b within the drive unit 6 as the cutting progresses, thereby adjusting the length of the wire saw 3 outside the drive unit 6 and any deflection resulting from the length of the wire saw 3. Furthermore, the cutting device 1 is not limited to the above configuration, and for example, a mechanism for pulling and recovering an unnecessary length of the wire saw 3 may be provided in the drive unit 6.

The height of the wire saw 3 wound between the lower guide pulleys 52a, 52b is maintained at the height of the lower cutting end 2e by a pair of third guide pulleys 83a, 83b and a fourth guide pulley 93. When the wire saw 3 approaches the cutting position, the wire saw height maintaining device 8 is released from its fixed state by the fixing part 81, removed, moved toward the cutting device 1, and similarly fixed again by the fixing part 81. The height of the pair of third guide pulleys 83a, 83b is again maintained at the height of the lower cutting end 2e by the width adjustment part 82 and a pair of height adjustment parts 84, 84.

The wire saw 3, which is positioned between multiple foundation beams 21 (between the objects to be cut) at the tip 2b side of the cutting area 2a, is held in a tensile state by the fourth guide pulley 93.

The cutting along the lower cutting edge 2e of the cutting area 2a using the above method is continued up to the other end 2h on the cutting device 1 side, forming a cutting groove 2i along the XY plane at the lower end of the cutting area 2a.

After the above cutting is performed, the circular movement of the wire saw 3 is temporarily stopped. In this state, the bow-shaped bending of the wire saw 3 in plan view is again eliminated by adjusting the Z-direction positions of the winding pulleys 42a and 42b in the same manner as above, and the wire saw 3 is positioned on the other end 2h between the pair of lower guide pulleys 52a and 52b.

<Second vertical cutting step>
Next, the circulating drive of the wire saw 3 is resumed, and the wire saw 3, located at the lower cutting end 2e of the other end 2h, is moved upward in the Z direction, and the other end 2h is pulled upward in the Z direction to cut. Specifically, while the wire saw 3 is rotated in a circulating manner, the pair of height adjustment members 73, 73 are contracted upward in the Z direction, and the pair of lower guide pulleys 52a, 52b and the wire saw 3 are raised. This process forms a cutting groove 2j along the XZ plane on the other end 2h side of the cutting region 2a. When the wire saw 3 reaches above the cutting region 2a, the cutting groove 2j opens onto the upper surface 2c of the cutting region 2a.

<Component cutting process>
The plurality of foundation beams 21 cut out by the cutting grooves 2g, 2i, and 2j through the above process are lifted and removed from the cutting area 2a by heavy machinery such as a crane.

In the above process, if the cutting area 2a is long in the Y direction and multiple foundation beams 21 are to be cut into multiple cut pieces, after performing the second vertical cutting process or component cutting process, the horizontal cutting process through the component cutting process can be repeated from the other end 2h in the same procedure as above to continuously cut out the cut pieces. In this case, the cutting device 1 moves in the Y direction as necessary so that the wire saw 3 rotates cyclically. Thereafter, the horizontal cutting process through the component cutting process can be repeated as described above.

By performing each of the above steps, the four foundation beams 21 are cut simultaneously and the cutting work is completed.

Next, the operation and effects of the structural member cutting device and structural member cutting method according to the above-described embodiment of the present invention will be explained using drawings.

The cutting device 1 uses the expansion/contraction mechanism 7 to expand and contract the pair of lower guide pulleys 52a, 52b (second guide pulleys 5) and the pair of height adjustment members 73, 73 in the X direction relative to the first guide pulley 4 arranged in the drive unit 6 in accordance with the width of the cutting region 2a of the structural member 2, thereby making it possible to appropriately adjust the cutting width and increase the cuttable width of the structural member 2. For example, while the current cuttable width for one mat slab or foundation beam is approximately 2.0 m to 2.4 m, the expansion/contraction mechanism 7 can set the cuttable width to 3.0 m to 4.0 m.
Therefore, even when there are multiple structural members 2 to be cut, such as the multiple foundation beams 21 in this embodiment, the multiple foundation beams 21 can be cut simultaneously by arranging the pair of lower guide pulleys 52a, 52b and the pair of height adjustment members 73, 73 so that they straddle the multiple foundation beams 21 in the X direction using the expansion/contraction mechanism 7. As a result, it is possible to reduce the construction labor required for cutting the structural members 2 and to improve the efficiency of the work.

The cutting device 1 maintains the cutting height of the wire saw 3 using a pair of third guide pulleys 83a, 83b, thereby preventing the wire saw 3 from deflecting when cutting the structural member 2. This prevents damage to the wire saw 3 caused by cutting through the crushed stone layer or ground below the structural member 2. It also reduces the effort required to monitor the cutting height of the wire saw 3.

The cutting device 1 uses a pair of third guide pulleys 83a, 83b to maintain the cutting height of the wire saw 3 at the lower cutting end 2e, which is close to the bottom end of the structural member 2. This reduces the amount of post-processing required for remaining components, such as chipping and dismantling concrete remaining between the cut surface and the crushed stone layer after removing the cut structural member 2. This reduces the amount of work required to cut the structural member 2 and improves work efficiency.

In the cutting device 1, the wire saw height holding device 8 can adjust the positions of the pair of third guide pulleys 83a, 83b in the X and Z directions using the width adjustment unit 82 and a pair of height adjustment units 84, 84, making it easy to adjust the positions of the pair of third guide pulleys 83a, 83b when cutting a rectangular structural member 2.

The cutting device 1 includes a pair of stiffening portions 72, 72 each having a support plate 721, 721 and a support caster 722, 722 extending downward in the Z direction from the support plate 721, 721 and in contact with the upper surface 2c of the structural member 2.
With the above configuration, the cutting device 1 can reinforce the rigidity of the second guide pulley 5 and the pair of guide members 71, 71, which expand and contract in the X direction, thereby preventing shifts in the positioning of the pair of upper guide pulleys 51a, 51b and the pair of lower guide pulleys 52a, 52b and shifts in the cutting position of the structural member 2 by the wire saw 3.

The cutting device 1 is equipped with a fourth guide pulley 93 located approximately in the center of the cutting width of the cutting position of the structural member 2, which tensions the wire saw 3 at the cutting position of the structural member 2, and a moving mechanism 9 provided in the drive unit 6, which moves the fourth guide pulley 93 along the cutting direction of the structural member 2.
With the above configuration, the cutting device 1 can tension the wire saw 3 at the cutting position using the fourth guide pulley 93, thereby more reliably preventing the wire saw 3 from bending when cutting the structural member 2, and allowing the structural member 2 to be cut at the desired position.

The above describes embodiments of the structural member cutting device and structural member cutting method according to the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention.

In the above embodiment, the cutting device 1 is applied to simultaneously cutting multiple foundation beams 21, but this is not limited to the above embodiment. For example, it may be applied when cutting a mat slab or a single foundation beam, or when cutting a deck slab. In the above cases, the installation of the third guide pulley may be omitted.

In the above embodiment, the third guide pulleys 83a and 83b are equipped with a position adjustment mechanism, but any configuration other than a position adjustment mechanism (width adjustment unit 82, height adjustment unit 84) may be used as long as it can support and fix the third guide pulleys 83a and 83b in a predetermined position.

In the above embodiment, a support plate 721 is provided between the first guide pulley 4 and the second guide pulley 5, and a support caster 722 is connected to the support plate 721 and grounded on the surface of the structural member 2. However, the support plate 721 may be omitted if the strength of the cutting device 1 is ensured. Furthermore, when the distance between the second guide pulleys 51a and 52b is changed by the expansion/contraction mechanism 7, the movement may be achieved by a method other than the support caster 722.

In the above embodiment, a fourth guide pulley 93 is provided at approximately the center of the cutting width of the structural member 2 to tension the wire saw 3 at the cutting position of the structural member 2, and a movement mechanism 9 is provided on the drive unit 6 to move the fourth guide pulley 93 along the cutting direction of the structural member 2. However, if the width of the structural member 2 is not particularly large, the fourth guide pulley 93 does not need to be attached. Furthermore, the movement mechanism 9 is not essential. In that case, the wire saw height holding device 8 can be moved by a means separate from the movement mechanism 9.

1. Structural member cutting device (cutting device)
2 Structural member 3 Wire saw 4 First guide pulley 5 Second guide pulley 6 Drive unit 7 Expanding/contracting mechanism 41 Drive pulley 42a, 42b Winding pulley 82 Width adjustment unit 83a, 83b Third guide pulley 84 Height adjustment unit 93 Fourth guide pulley

Claims (6)

a wire saw for cutting the structural member;
a plurality of first guide pulleys and a plurality of second guide pulleys for winding the wire saw in an endless loop and circulating and rotating the wire saw;
an expansion/contraction mechanism that expands and contracts the plurality of second guide pulleys relative to the first guide pulley in the width direction of the structural member in accordance with the width length of the structural member;
a drive unit that drives the plurality of first guide pulleys and the plurality of second guide pulleys;
Equipped with
The first guide pulley includes a drive pulley that rotates the wire saw in a circular motion and a take-up pulley that adjusts the length of the wire saw ,
a fourth guide pulley arranged at approximately the center of the cutting width of the cutting position of the structural member, tensioning the wire saw at the cutting position of the structural member;
a movement mechanism provided in the drive unit and configured to move the fourth guide pulley along the cutting direction of the structural member;
Equipped with
Structural member cutting equipment. a plurality of third guide pulleys for maintaining the cutting height of the wire saw;
2. The structural member cutting device according to claim 1. a position adjustment mechanism for adjusting the positions of the plurality of third guide pulleys;
3. The structural member cutting device according to claim 2. the position adjustment mechanism is configured to be able to adjust positions of the plurality of third guide pulleys in the height direction and the width direction of the structural member.
4. The structural member cutting device according to claim 3. a support plate provided between the first guide pulley and the second guide pulley;
a support caster connected to the support plate and adapted to contact the surface of the structural member;
Equipped with
The structural member cutting device according to any one of claims 1 to 4. a wire saw for cutting the structural member;
a plurality of first guide pulleys and a plurality of second guide pulleys for winding the wire saw in an endless loop and circulating and rotating the wire saw;
an expansion/contraction mechanism that expands and contracts the plurality of second guide pulleys relative to the first guide pulley in the width direction of the structural member in accordance with the width length of the structural member;
a drive unit that drives the plurality of first guide pulleys and the plurality of second guide pulleys;
A cutting method for cutting the structural member using a cutting device comprising:
The first guide pulley includes a drive pulley that rotates the wire saw in a circular motion and a take-up pulley that adjusts the length of the wire saw,
a plurality of third guide pulleys for maintaining a cutting height of the wire saw; and a position adjustment mechanism for adjusting positions of the plurality of third guide pulleys,
The plurality of second guide pulleys are expanded by the expansion/contraction mechanism to a width equal to or greater than a span in the width direction of the structural member,
Positioning the wire saw at a distal end of a cutting area of the structural member;
the plurality of third guide pulleys are disposed at widthwise sides of the structural member at a cutting height of the structural member;
The drive unit drives the plurality of first guide pulleys and the plurality of second guide pulleys to circulate the wire saw;
The wire saw is pulled toward the cutting device and moved in a cutting direction to cut the structural member ;
a fourth guide pulley arranged at approximately the center of the cutting width of the cutting position of the structural member, tensioning the wire saw at the cutting position of the structural member;
a movement mechanism provided in the drive unit and configured to move the fourth guide pulley along the cutting direction of the structural member,
the structural member comprises a plurality of foundation beams;
The plurality of second guide pulleys are expanded by the expansion/contraction mechanism so as to straddle the plurality of foundation beams,
The wire saw is disposed at the tip of the cutting region of the plurality of foundation beams,
the plurality of third guide pulleys are disposed at widthwise sides of the structural member at a cutting height of the structural member;
the fourth guide pulley is disposed between the plurality of foundation beams and at the center of the cutting area in the width direction by the movement mechanism;
The drive unit drives the plurality of first guide pulleys and the plurality of second guide pulleys to circulate the wire saw;
The wire saw is pulled toward the cutting device and moved in a cutting direction to simultaneously cut the plurality of foundation beams.
How to cut structural members.