Structural member cutting device and structural member cutting method

Abstract

To provide a structural member cutting apparatus and a structural member cutting method which are capable of widening a cuttable width of a structural member.SOLUTION: A structural member cutting apparatus comprises: a wire saw 3 for cutting a structural member 2; plural first guide pulleys 4 and plural second guide pulleys 5 for wrapping the wire saw 3 into an endless loop shape so as to be circularly rolled; a contraction mechanism 7 for contracting the plural second guide pulleys 5 in a width direction of the structural member 2 in accordance with a width length of the structural member 2 with respect to the first guide pulleys 4; and a driving part 6 for driving the plural first guide pulleys 4 and the plural second guide pulleys 5. Each first guide pulley 4 comprises: a driving pulley 41 for circularly rolling the wire saw 3; and winding pulleys 42a, 42b for adjusting a length of the wire saw 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structural member cutting device and a structural member cutting method. [Background technology]

[0002] Conventional 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.

[0003] As a method for solving the above problem, 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-111768 [Patent Document 2] Japanese Patent Application Publication No. 2019-123168 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the above method, the applicable width of cutting objects such as foundation beams and mat slabs is a maximum of approximately 2,400 mm, and depending on 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.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a structural member cutting device and a structural member cutting method that can widen the cuttable width of a structural member. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, 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 rotating it in a circular motion, 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 length 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 rotating the wire saw in a circular motion and a winding pulley for adjusting the length of the wire saw.

[0008] With the above configuration, the structural member cutting device can use the expansion / contraction mechanism to expand and contract the multiple second guide pulleys relative to the multiple first guide pulleys in the width direction of the structural member in accordance with the width length of the structural member, thereby widening the cuttable width of the structural member. For example, if the structural members are multiple foundation beams, the multiple foundation beams can be cut simultaneously by positioning the second guide pulleys so as to straddle the foundation beams using the expansion / contraction mechanism and rotating the wire saw in a circular motion.

[0009] The structural member cutting device according to the present invention may also include a plurality of third guide pulleys that maintain the cutting height of the wire saw.

[0010] With the above-described 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 the structural member and preventing damage to the wire saw caused by cutting through the crushed stone layer or ground below the structural member. In addition, because the cutting height of the wire saw can be maintained at a low position near the bottom end of the structural member, post-processing of remaining members, such as chipping and demolition of concrete remaining between the cut surface and the crushed stone layer, can be reduced.

[0011] The structural member cutting device according to the present invention may also include a position adjustment mechanism that adjusts the positions of the plurality of third guide pulleys.

[0012] 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 by the wire saw.

[0013] In addition, in the structural member cutting device according to the present invention, the position adjustment mechanism may be configured to be able to adjust the positions of the plurality of third guide pulleys in the height direction and width direction of the structural member.

[0014] 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 a rectangular structural member.

[0015] In addition, the structural member cutting device of the present invention may 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.

[0016] With the above configuration, the structural member cutting device can reinforce the rigidity of the multiple second guide pulleys that expand and contract in the width direction of the structural member using the support plate, thereby preventing the second guide pulleys from shifting in their positions and the cutting position of the structural member using the wire saw. In addition, by providing support casters, the second guide pulleys can be easily expanded and contracted in the width direction.

[0017] In addition, the structural member cutting device of 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 moving mechanism that is provided in the drive unit and moves the fourth guide pulley along the cutting direction of the structural member.

[0018] With the above configuration, the structural member cutting device can use the fourth guide pulley to tension the wire saw at the cutting position, thereby 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.

[0019] In order to achieve the above object, a method for cutting a structural member according to the present invention includes 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 the wire saw, an expansion / contraction mechanism for expanding and 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 length 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 includes a drive pulley for circulating and rotating the wire saw, and a take-up pulley for adjusting the length of the wire saw, and a position adjustment mechanism for adjusting the positions of the plurality of third guide pulleys, wherein the plurality of second guide pulleys are expanded by the expansion / contraction mechanism to a width greater than or equal to the width span of the structural member, the wire saw is positioned at the tip of the cutting area of ​​the structural member, the plurality of third guide pulleys are positioned at the width lateral sides of the structural member at the cutting height of the structural member, the plurality of first guide pulleys and the plurality of second guide pulleys are driven by the drive unit to rotate the wire saw in a circulating manner, and the wire saw is pulled toward the cutting device and moved in the cutting direction to cut the structural member.

[0020] With the above-described method for cutting a structural member, the multiple second guide pulleys can be expanded by an 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 the structural member.

[0021] In order to achieve the above-mentioned object, the method for cutting a structural member of the present invention comprises: 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 moving mechanism that is provided in the drive unit and moves the fourth guide pulley along the cutting direction of the structural member, wherein 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 span the plurality of foundation beams, the wire saw is positioned at the ends of the cutting areas of the plurality of foundation beams, the plurality of third guide pulleys are positioned on the widthwise sides of the structural member at the cutting height of the structural member, the fourth guide pulley is positioned between the plurality of foundation beams and in the widthwise center of the cutting area by the moving mechanism, and the drive unit drives the plurality of first guide pulleys and the plurality of 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 plurality of foundation beams.

[0022] By using the above-mentioned method for cutting structural members, the fourth guide pulley is positioned at the center of the width of the cutting area, and multiple second guide pulleys are expanded and positioned to span multiple foundation beams using an expansion / contraction mechanism, allowing multiple foundation beams to be cut simultaneously with a wire saw. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a structural member cutting device and a structural member cutting method that can widen the cuttable width of a structural member. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a front view showing an example of a structural member cutting device according to an embodiment of the present invention. [Figure 2] 1 is a plan view showing an example of a structural member cutting device according to an embodiment of the present invention. [Figure 3] FIG. 3 is a view taken along the arrow A in FIG. 2. [Figure 4] FIG. 3 is a view taken along the arrow B in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of a structural member cutting device and a structural member cutting method according to the present invention will be described with reference to the drawings. Note that the drawings used in the following description are schematic, and the ratios of length, width, thickness, etc. are not necessarily the same as those in the actual cases and can be changed as appropriate.

[0026] The structural member cutting device 1 cuts a cutting area 2a to be cut in a large concrete structural member 2, such as a foundation beam or a mat slab, which are arranged at regular intervals in one direction (hereinafter, the "structural member cutting device 1" will be referred to as the "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.

[0027] 1 and 2, the cutting device 1 includes a wire saw 3, a plurality of first guide pulleys 4, a plurality of 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 region 2a by rotating the wire saw 3 in a circular motion.

[0028] The total 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 known diamond wire.

[0029] 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.

[0030] The drive pulley 41, the take-up pulleys 42a and 42b, and the fixed pulleys 43a, 43b, 43c, and 43d are disposed inside the drive unit 6. The drive unit 6 is stably disposed on the structural member 2. The drive unit 6 may be disposed on the structural member 2 via a horizontal base or the like.

[0031] The drive pulley 41 is connected to the drive unit 6 via a shaft 410 extending along the Y direction, and is driven to rotate about the shaft 410 by the drive unit 6, transmitting a 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. The drive pulley 41 moves independently through the through hole 61a along the Z direction by the drive unit 6, and adjusts the tension of the wire saw 3.

[0032] 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 as the wire saw 3 rotates in a circular motion when 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. 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 draw 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.

[0033] The fixed pulleys 43a, 43b, 43c, and 43d are disposed at a predetermined interval in the X direction below at least the drive pulley 41 and the take-up pulleys 42a and 42b, and are fixed inside 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 be configured to be directly attached inside the drive unit 6, for example.

[0034] The pair of upper guide pulleys 51 a and 51 b and the pair of lower guide pulleys 52 a and 52 b are disposed outside the drive unit 6 .

[0035] The expansion / contraction mechanism 7 includes a pair of guide members 71, 71, a pair of stiffening portions 72, 72, and a pair of height adjustment members 73, 73.

[0036] The pair of guide members 71, 71 are provided so that the distance between them in the X direction can be increased or decreased, and the length of the wire saw 3 is adjusted in accordance with the increase or decrease in the X direction of the pair of guide members 71, 71. 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 as to be rotatable in the X direction about axes 712, 712. The upper guide pulleys 51a, 51b are each driven to rotate about the axes 712 in accordance with the circular rotation of the wire saw 3.

[0037] 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.

[0038] The pair of stiffening parts 72, 72 are each disposed between the guide member 71 and the drive unit 6, and stiffen the pair of guide members 71, 71 and the pair of height adjustment members 73, 73, preventing deformation of these members. The stiffening part 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 2 c of the structural member 2. The pair of support casters 722, 722 rotate on the upper surface 2 c in accordance with the expansion and contraction of the pair of guide members 71, 71, thereby smoothing the expansion and contraction operation of the expansion and contraction mechanism 7.

[0039] The 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. The 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 positions of the pair of lower guide pulleys 52a, 52b in the Z direction are adjusted.

[0040] The pair of lower guide pulleys 52a, 52b are connected to each other so as to be rotatable about axes 732, 732 via connecting fittings 731, 731 provided at the lower ends of the pair of height adjustment members 73, 73, respectively. The pair of lower guide pulleys 52a, 52b rotate about the guide members 71, 71, respectively. Specifically, the connecting fitting 731 is provided to the height adjustment member 73 so as to be rotatable about the Z axis at a 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 while being erected along the Z direction.

[0041] 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.

[0042] The wire saw height holding device 8 includes a fixing unit 81, a width adjustment unit (position adjustment mechanism) 82, a pair of third guide pulleys 83a, 83b, and a pair of height adjustment units (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.

[0043] 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 disposed 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 configured, for example, to be fixed by driving a known steel anchor into the structural member 2. The above configuration makes it easy to attach and detach the wire saw height holding device 8, reducing the effort required for the work.

[0044] The width adjustment part 82 is connected to the fixed part 81, and is provided so that its ends 82a, 82b can expand and contract or slide in the X direction. The width adjustment part 82 expands and contracts or slides in the X direction to adjust the positions of the pair of third guide pulleys 83a, 83b in the X direction.

[0045] The pair of height adjustment parts 84, 84 are provided at the ends 82a, 82b of the width adjustment part 82, respectively, and are provided so as to be extendable or slidable in the Z direction. The pair of height adjustment parts 84, 84 adjust the Z-directional positions of the pair of third guide pulleys 83a, 83b by extending or sliding in the Z direction.

[0046] The pair of third guide pulleys 83a, 83b are provided near the respective lower ends of a 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 arranged so that the winding parts 831, 831 of the wire saw 3 are positioned to protrude outward in the X direction from the width adjustment part 82 in a plan view.

[0047] The configuration of the width adjustment unit 82 and the height adjustment unit 84 is not limited, and may be, for example, a slide mechanism that adjusts the position by sliding in the X direction and the Z direction. 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 configured to be positioned at desired positions.

[0048] 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. A 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 provided so as 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 provided so as to be extendable or slidable in the Z direction relative to the length adjustment unit 91. A fourth guide pulley 93 is connected to the vicinity of the lower end of the height adjustment unit 92.

[0049] The fixing 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.

[0050] The configuration of the length adjustment unit 91 and the 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.

[0051] 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 the top.

[0052] 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, the upper guide pulley 51a, the lower guide pulley 52a, the third guide pulley 83a, the fourth guide pulley 93, the third guide pulley 83b, the lower guide pulley 52b, the upper guide pulley 51b, the fixed pulley 43b, the take-up pulley 42a, the fixed pulley 43c, the take-up pulley 42b, the fixed pulley 43d, and back to the drive pulley 41. The wire saw 3 rotates cyclically when the drive unit 6 rotates the drive pulley 41. The length of the cyclically rotating wire saw 3 is adjusted by adjusting the positions of the take-up pulleys 42a and 42b in the Z direction, thereby suppressing bending of the wire saw 3. The winding direction and rotation direction of the wire saw 3 may be clockwise or counterclockwise.

[0053] Next, a method for cutting a structural member using the above-described cutting device 1 will be described with reference to the drawings.

[0054] As shown in FIGS. 1 to 4 , the structural member 2 is 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 includes 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 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 applied in this embodiment is, for example, approximately 3.0 m to 4.0 m, depending on the expansion / contraction mechanism 7 expanding the pair of guide members 71 and the pair of upper guide pulleys 51a and 51b in the X direction.

[0055] The cutting method of this embodiment includes a first vertical cutting step, a horizontal cutting step, a second vertical cutting step, and a component cutting step. Each step will be described below.

[0056] <First vertical cutting process> 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 distance between the pair of guide members 71, 71 in the X direction approximately matches the width of the cutting region 2a in the X direction. 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 their distance in the X direction approximately matches the width of the cutting region 2a in the X direction. 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 cutting 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.

[0057] <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 of the cutting area 2a in the Y direction. The pair of lower guide pulleys 52a, 52b and the wire saw 3 are positioned at the lower cutting end 2e by adjusting their positions in the Z direction 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 that it does not 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.

[0058] 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 and removed, moved to the cutting device 1 side, and similarly fixed again by the fixing part 81, and 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 adjusting part 82 and the pair of height adjusting parts 84, 84.

[0059] The wire saw 3 arranged between the plurality of foundation beams 21 (between the objects to be cut) on the tip 2b side of the cutting region 2a is held in a tensioned state by the fourth guide pulley 93.

[0060] The cutting along the lower cutting end 2e of the cutting region 2a by the above method is continued up to the other end 2h on the cutting device 1 side, and a cutting groove 2i is formed along the XY plane at the lower end of the cutting region 2a.

[0061] After the above cutting is performed, the circular drive of the wire saw 3 is temporarily stopped. In the above 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.

[0062] <Second vertical cutting process> 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.

[0063] <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.

[0064] In the above process, if the cutting region 2a is long in the Y direction and multiple foundation beams 21 are cut into multiple cut members, after the second vertical cutting process or component cutting process is performed, the horizontal cutting process to component cutting process can be repeated from the other end 2h in the same procedure as above to continuously cut out the cut members. At this time, the cutting device 1 moves in the Y direction as necessary so that the wire saw 3 rotates cyclically. Thereafter, the horizontal cutting process to component cutting process can be repeated as described above.

[0065] By carrying out the above steps, the four foundation beams 21 are cut simultaneously and the cutting work is completed.

[0066] Next, the operation and effect of the structural member cutting device and structural member cutting method according to the above-described embodiment of the present invention will be described with reference to the drawings.

[0067] The cutting device 1 uses the expansion / contraction mechanism 7 to expand / 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 area 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.

[0068] The cutting device 1 maintains the cutting height of the wire saw 3 with a pair of third guide pulleys 83a, 83b, thereby suppressing deflection of the wire saw 3 when cutting the structural member 2. This prevents damage to the wire saw 3 caused by cutting 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.

[0069] The cutting device 1 can maintain the cutting height of the wire saw 3 at the lower cutting end 2e near the bottom end of the structural member 2 using the pair of third guide pulleys 83a, 83b, which reduces the amount of post-processing required for remaining components, such as chipping and dismantling the 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 the efficiency of the work.

[0070] 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, so that the positions of the pair of third guide pulleys 83a, 83b can be easily adjusted when cutting the rectangular structural member 2.

[0071] 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.

[0072] 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, which is provided in the drive unit 6 and 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.

[0073] 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 within the scope of the spirit thereof.

[0074] In the above embodiment, the cutting device 1 is applied to simultaneously cutting multiple foundation beams 21, but is not limited to the above embodiment and may be applied to, for example, cutting a mat slab or a single foundation beam, or to cutting a deck slab. In the above cases, the installation of the third guide pulley may be omitted.

[0075] In the above embodiment, an example was described in which the third guide pulleys 83a and 83b were equipped with a position adjustment mechanism, but as long as the third guide pulleys 83a and 83b can be supported and fixed at a predetermined position, a configuration other than the position adjustment mechanism (width adjustment unit 82, height adjustment unit 84) may be used.

[0076] In the above embodiment, a support plate 721 is provided between the first guide pulley 4 and the second guide pulley 5, and support casters 722 are connected to the support plate 721 and are in contact with 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 second guide pulleys 51a and 52b may be moved by a method other than the support casters 722.

[0077] In the above embodiment, a fourth guide pulley 93 that tensions the wire saw 3 at the cutting position of the structural member 2 and a movement mechanism 9 that is provided in the drive unit 6 and moves the fourth guide pulley 93 along the cutting direction of the structural member 2 are provided at approximately the center of the cutting width of the cutting position of the structural member 2. However, if the size of the structural member 2 in the width direction 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. [Explanation of symbols]

[0078] 1. Structural member cutting device (cutting device) 2 Structural members 3 Wire saw 4 First guide pulley 5 Second guide pulley 6 Drive unit 7. Scaling mechanism 41 Drive pulley 42a, 42b Winding pulley 82 Width adjustment section 83a, 83b Third guide pulley 84 Height adjustment unit 93 Fourth guide pulley

Claims

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

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; 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.

Images