Steel frame plasma cutting device

Abstract

To provide a steel frame plasma cutting device capable of cutting steel frame members in a simple operation through mechanization without relying on specialist workers while improving work efficiency with less time required.SOLUTION: A steel frame plasma cutting device 1 includes: a cutting torch 50 for plasma cutting; and an arm 30 with the cutting torch 50 attached to the tip of the arm. A steel frame plasma cutting method is a method of moving the cutting torch 50 along a steel frame member 20 constituting a steel beam or a column 22 of a building and cutting the steel frame member 20 into blocks by plasma cutting using the steel frame plasma cutting device 1.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a steel frame plasma cutting method. [Background technology]

[0002] In the past, construction projects to demolish old buildings and build new ones have been increasing. Some of these buildings were constructed as skyscrapers, but they are now being demolished due to their age, and the buildings being demolished are becoming taller. In previous demolition work, small and medium-sized buildings were often demolished and replaced with skyscrapers. Therefore, most of the buildings being demolished were small and medium-sized, and the demolition method was often the use of backhoes and nibblers, with the dismantled materials being dropped from the upper floors to the lower floors.

[0003] Furthermore, as mentioned above, in recent years, due to an increase in demolition work for skyscrapers and environmental measures during demolition, the construction methods used to demolish small and medium-sized buildings are no longer sufficient. In this situation, a block demolition method is known in which a heavy demolition machine is placed on the demolition floor, concrete and steel frames are broken down into small pieces, and then the pieces are dropped to the floor below (see, for example, Patent Document 1). In this case, block demolition is a method in which the demolition materials are cut out in block form and transported in block form without being broken down into small pieces on the spot.

[0004] In this type of block dismantling method, the concrete slab is cut with a road cutter or the like, and the steel members are cut using gas cutting or the like. When cutting the steel beams during block dismantling, the concrete slab is first cut with a road cutter or the like, and then the webs and bottom flanges of the steel beams that support the load of the slab are cut using gas cutting or the like. At this time, the top flanges of the steel beams are left in place, and when the blocks are to be transported, the members are sling-loaded with a crane or the like, and once they are hoisted up, the top flanges are cut and the dismantled members are transported. Similarly, cutting of steel columns is also performed by professional workers using gas cutting or the like. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-136866 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional block dismantling method shown in Patent Document 1, the cutting time required for transporting the blocks can be shortened by cutting steel members such as steel beams and steel columns in advance, which can speed up the transport cycle and is expected to improve the construction speed. However, since the work of cutting the steel members in advance is also performed by specialized workers, there is a demand for mechanization to improve work efficiency, and there is room for improvement in this regard.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a steel frame plasma cutting method that can cut steel frame components with simple operations through mechanization without relying on specialized workers, thereby improving work efficiency and reducing the time required for work. [Means for solving the problem]

[0008] In order to achieve the above-mentioned objective, the steel frame plasma cutting method of the present invention comprises a steel frame plasma cutting device having a cutting torch for plasma cutting and an arm portion with the cutting torch attached to the tip of the arm, and is characterized in that using the steel frame plasma cutting device, the cutting torch is moved along the steel frame members that make up the steel beams and steel columns of a building, and the steel frame members are cut into blocks by plasma cutting and cut out.

[0009] In the steel frame plasma cutting method according to the present invention, a steel frame plasma cutting device equipped with a cutting torch that generates plasma is installed near the cutting position of the steel frame member, and the cutting torch is moved along the cutting position by an arm unit, thereby plasma cutting the steel frame member. In this way, the cutting torch that performs plasma cutting, which has a faster cutting speed than gas cutting, can be moved mechanically by the arm unit, so that the work required by professional cutters can be reduced and work efficiency can be improved. In addition, since it is plasma cutting, there is no need for laborious work and adjustments by workers such as adjusting air, adjusting gas, and ignition as in conventional gas cutting, and work can be performed efficiently. Therefore, in the present invention, the steel frame members can be cut with simple operations, the work efficiency can be improved, and the time required for the work can be reduced. Therefore, by adopting the steel frame plasma cutting device of the present invention in the block dismantling method of the steel frame members, the steel frame members can be efficiently cut into blocks and dismantled.

[0010] In addition, in the steel frame plasma cutting method according to the present invention, it is preferable that the moving speed of the cutting torch moved by the arm portion is changed according to the thickness of the steel frame member.

[0011] In this case, the moving speed of the cutting torch can be changed according to the thickness of the steel frame member. For example, if the steel frame member is thick, the cutting torch is moved at a slower speed to cut the steel frame member. By controlling the moving speed of the cutting torch according to the thickness in this way, efficient and reliable cutting can be performed.

[0012] In addition, in the steel frame plasma cutting method according to the present invention, it is preferable that air is blown toward dross produced during cutting with the cutting torch.

[0013] In this case, the dross that is generated during cutting and accumulates in the gaps in the cut parts of the steel frame members can be blown away by the blown air, and the gaps can be secured to perform reliable cutting. In this way, it is possible to prevent dross from accumulating in the cut parts of the steel frame members, making it possible to perform upward cutting with the cutting torch facing upward.

[0014] In addition, in the steel plasma cutting method according to the present invention, it is preferable that the movement pattern of the cutting torch is switched between when cutting the steel beam and when cutting the steel column.

[0015] In this case, cutting can be performed by moving the cutting torch in accordance with the cutting positions on both the steel beams and the steel columns of the steel member.

[0016] In addition, in the steel plasma cutting method of the present invention, when cutting the steel beam, it is preferable to move the cutting torch upward at an angle in a direction intersecting the vertical direction of the steel beam to cut.

[0017] In this case, the cut portion of the cut steel beam is angled so that it intersects with the vertical direction, making it easier to lift the cut block-shaped steel beam upward and remove it, thereby improving the efficiency of construction.

[0018] In addition, it is preferable that the steel plasma cutting method of the present invention includes the steps of plasma cutting the steel beam by cutting up with the cutting torch leaving the upper part, suspending and supporting a block-shaped portion of the steel beam to be cut out, and gas-cutting the upper part to cut out the block-shaped steel beam.

[0019] In this case, only the top part of the steel beam, which is the final cutting part to cut out the steel beam block, can be cut reliably and carefully by the worker, and the remaining part except the top part can be efficiently cut by plasma cutting by automatically moving the cutting torch using a steel plasma cutting device, so the work of cutting the steel beam into blocks can be carried out efficiently and precisely.

[0020] In addition, in the steel plasma cutting method according to the present invention, when cutting the steel column, it is preferable to move the cutting torch horizontally to cut the steel column.

[0021] In this case, by moving the cutting torch horizontally to cut the steel column horizontally, the cut block-shaped steel column can be lifted upwards for easy removal, thereby making construction more efficient.

[0022] In addition, it is preferable that the steel plasma cutting method of the present invention includes the steps of plasma cutting each corner of the steel column horizontally using the cutting torch, suspending and supporting a block-shaped portion of the steel column from which the steel column is cut, and gas-cutting horizontally between the corners to cut out the block-shaped steel column.

[0023] In this case, workers can reliably and carefully cut only the area between the corners of the steel column, which is the final cutting point to cut out the steel column block, and the remaining parts remaining between the corners are efficiently cut by plasma cutting using a steel plasma cutting device, which automatically moves the cutting torch, so that the work of cutting the steel column into blocks can be carried out efficiently and precisely.

[0024] In addition, in the steel frame plasma cutting method of the present invention, it is preferable that the cutting torch can be moved by remote control using a mobile terminal.

[0025] In this case, the steel frame plasma cutting device can be easily operated remotely using a mobile terminal. Therefore, the cutting torch movement can be confirmed from the surroundings while operating, allowing for highly accurate cutting. Effect of the Invention

[0026] According to the steel frame plasma cutting method of the present invention, steel frame components can be cut with simple operations through mechanization without relying on specialized workers, improving work efficiency and reducing the time required for work. [Brief description of the drawings]

[0027] [Figure 1] 1 is a plan view of a steel plasma cutting device according to an embodiment of the present invention, viewed from above. [Diagram 2] 2 is a view taken along line II in FIG. 1 and is a side view of the steel frame plasma cutting device. FIG. [Diagram 3] 3 is a view taken along line III in FIG. 1, and is a front view of the steel frame plasma cutting device. [Figure 4] 1 is a side view of a steel column cut by a steel plasma cutting device. [Diagram 5] This is a horizontal cross-sectional view of a steel column cut by a steel plasma cutting device. [Figure 6] 1 is a side view of a steel beam viewed from the axial direction thereof, showing the state in which the steel beam is cut by a steel beam plasma cutting device. [Figure 7] 7 is a view taken along line VII in FIG. 6, and is a plan view showing a state in which a steel beam is being cut by a steel plasma cutting device. [Figure 8] 1 is a side view showing a state in which a steel beam is cut by a steel plasma cutting device. [Figure 9] 1 is a side view of a steel beam cut by a steel plasma cutting device. [Figure 10] A cross-sectional view of a steel column cut by a steel plasma cutting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, a steel frame plasma cutting method according to an embodiment of the present invention will be described with reference to the drawings.

[0029] As shown in Figures 1, 2 and 3, the steel plasma cutting device 1 of this embodiment is used in a block demolition method in which steel members 20 that constitute the steel beams 21 and steel columns 22 of a building 2 are plasma cut, and the steel members 20 are cut into blocks for dismantling.

[0030] In this embodiment, the steel frame members 20 are cut into dismantled blocks, which are efficiently cut using both plasma cutting with the steel frame plasma cutting device 1 of this embodiment and gas cutting. The steel frame plasma cutting device 1 is a device that cuts out the steel frame members 20 into dismantled blocks of any shape and size.

[0031] The steel frame plasma cutting device 1 of this embodiment is a device that is attached near the cutting location of the steel frame member 20 to be cut and is capable of cutting both steel frame beams 21 and steel frame columns 22. The steel frame plasma cutting device 1 comprises a base 40 that can be mounted on a running unit (not shown), an arm unit 30 provided on the base 40, and a cutting torch 50 attached to the tip of the arm unit 30. The cutting torch 50 is provided so as to be movable along the steel frame member 20.

[0032] The steel plasma cutting device 1 is provided so that the movement pattern of the cutting torch 50 can be switched between when cutting a steel beam 21 and when cutting a steel column 22. As shown in Figs. 8 to 10 described later, the steel beam 21 in this embodiment is an H-shaped steel material with a hexagonal hole in the web 21a. As shown in Figs. 4 and 5 described later, the steel column 22 is a square steel pipe with a square cross section.

[0033] The steel frame plasma cutting device 1 is provided so that the cutting torch 50 can be moved by remote control using a mobile terminal (not shown). Alternatively, the device is not limited to a mobile terminal, and remote control is also possible using a personal computer.

[0034] The base 40 has wheels 41 attached to its underside that roll on the floor surface. The base 40 can move on its own using the wheels 41 when detached from the running part. The base 40 is plate-like and has a substantially rectangular shape in a plan view seen from above, and is arranged with its longitudinal direction facing in the direction along the traveling direction of the running part (the front-rear direction X1 described below).

[0035] A forklift, for example, can be used as the travel unit (not shown). In this case, the base 40 equipped with the arm unit 30 is held by the load-receiving claws of the forklift, which can be raised and lowered, so that the base 40 is moved to a desired position as the forklift travels along the floor surface. Furthermore, by raising and lowering the load-receiving claws, the base 40 and the arm unit 30 equipped with the cutting torch 50 can be moved up and down.

[0036] Here, in the steel frame plasma cutting device 1, the longitudinal direction of the base 40 is defined as the front-rear direction X1, the side where the cutting torch 50 is placed is defined as the front side, and the opposite side is defined as the rear side. Also, the direction perpendicular to the front-rear direction X1 in a plan view is defined as the left-right direction X2. Furthermore, the extension direction of the first arm portion 31 described later is defined as the first direction J1, and the direction perpendicular to the first direction J1 is defined as the second direction J2. In this embodiment, the second direction J2 is the same direction as the left-right direction X2.

[0037] A recess 42 (see FIG. 1) that surrounds and accommodates the steel column 22 is formed in the front part of the base 40. The recess 42 is a rectangular opening with an opening at the front end in a plan view seen from above. That is, the base 40 has both left and right sides that sandwich the recess 42 protruding forward.

[0038] The arm unit 30 is mounted on a base 40. The arm unit 30 includes a first arm unit 31 supported by the base 40 and extending in a first direction J1, and a second arm unit 32 extending in a second direction J2 (left-right direction X2) perpendicular to the first arm unit 31 in a plan view seen from above and slidably provided on a front end 31a of the first arm unit 31. A pair of left and right arm portions 30 are provided. One of the pair of arm portions 30 is indicated by reference numeral 30A, and the other is indicated by reference numeral 30B.

[0039] The first arm portion 31 has a rotation support portion 33 that is rotatable about a central axis along the left-right direction X2. A support body 43 is fixed to the base 40. The rotation support portion 33 is supported on a side surface of the support body 43 facing the left-right direction X2. The first arm portion 31 has a guide 31b (see FIG. 3) that is guided by the rotation support portion 33 and is slidable in the first direction J1.

[0040] The orientation (angle) of the first direction J1 of the first arm portion 31 can be changed by rotating it on the rotation support portion 33. For example, the first direction J1 of the first arm portion 31 can be arranged to face the up-down direction (see FIG. 8).

[0041] Moreover, the pair of left and right first arm portions 31 can be arranged to sandwich the steel column 22 from both left and right sides by protruding forward from the base 40 with the first direction J1 facing horizontally (see FIG. 1). The forward protruding length of the first arm portions 31 is greater than the width dimension of the steel column 22, and is set to a length that allows the front end portion 31a of the first arm portion 31 to protrude forward of the steel column 22 when it is arranged in the recess 42 of the base 40. In other words, the second arm portion 32 is able to wrap around the back side (front side) of the steel column 22.

[0042] The front end 31a of the first arm portion 31 is provided with a sliding member 31A. The second arm portion 32 is provided with a guide rail 34 along which the sliding member 31A slides (see FIG. 6). The longitudinal direction (second direction J2) of the second arm portion 32 is perpendicular to the longitudinal direction (first direction J1) of the first arm portion 31.

[0043] A cutting torch 50 is supported on the tip 32a of the second arm portion 32 so as to be rotatable around the second direction J2 at a rotation angle of, for example, 360°. The second arm portion 32 slides in the second direction J2 relative to the sliding member 31A, so that the cutting torch 50 is movable in the left-right direction X2.

[0044] The arm unit 30 also includes a clamp unit 35 that is detachably fixed to the bottom flange 21b of the steel beam 21. The clamp unit 35 is provided on an upper end 36a of a support column 36 that extends upward from a support body 43 on the base 40. The clamp unit 35 has a fixed clamp 351 facing downward, and a movable clamp 352 that is movable in the vertical direction by being driven by air, for example, and moves toward and away from the fixed clamp 351 in the vertical direction. The fixed clamp 351 and the movable clamp 352 clamp the bottom flange 21b of the steel beam 21, thereby fixing the base 40 and the arm unit 30 to the steel beam 21.

[0045] The cutting torch 50 is provided at the tip 32a of the second arm portion 32 (see FIG. 6). The cutting torch 50 is movable along the second direction J2 together with the second arm portion 32. The cutting torch 50 can be remotely controlled by, for example, the above-mentioned mobile terminal (not shown), and can be operated by turning a switch ON / OFF.

[0046] A well-known plasma cutter is used as the cutting torch 50. That is, by connecting the positive terminal cable of the plasma cutter body to the steel frame member 20, which is the base material, and turning on the power, a plasma arc is generated between the metal of the steel frame member 20 and the cutting torch 50, which serves as an electrode. The high-temperature plasma generated at this time is used as a heat source, and the cutting torch 50 is moved along the steel frame member 20, thereby cutting the steel frame member 20.

[0047] The cutting torch 50 includes a guide portion (not shown) that ensures a constant distance between the torch tip and the cutting surface of the steel frame member 20. This guide portion is provided so that it can be biased toward the steel frame member 20. Specifically, the torch tip has guide rollers (not shown) on both ends, and by pressing the torch tip and the guide rollers against the cutting surface of the steel frame member 20 with a spring mechanism, it is possible to maintain a constant distance (for example, a distance of about 2 to 4 mm) between the torch tip and the steel frame member 20 to be cut, and cutting can be performed without the plasma arc misfire.

[0048] The steel frame plasma cutting device 1 is also provided with an air nozzle (not shown) that blows air toward dross produced during cutting by the cutting torch 50. This air nozzle is preferably provided on both the front and rear sides of the cutting torch 50 in the moving direction.

[0049] The steel frame plasma cutting device 1 includes a control unit (not shown) that controls the moving speed of the cutting torch 50 moved by the arm unit 30 in accordance with the thickness of the steel frame member 20.

[0050] Next, a method for cutting the steel frame member 20 using the above-mentioned steel frame plasma cutting device 1 will be described. First, a construction procedure for cutting the steel column 22 and dismantling it into blocks will be described. The steel column 22 is dismantled by cutting it horizontally and dividing the block-shaped steel column 22 into vertical parts, as shown in Figs. 4 and 5.

[0051] As shown in Fig. 1, the steel plasma cutting device 1 is arranged so that the cutting torch 50 can automatically move along the circumferential direction at a predetermined cutting height of the steel column 22 by traveling on the traveling part. That is, the steel column 22 is placed inside the recess 42 of the base 40 and installed. Next, the first arm parts 31 of the pair of left and right arm parts 30A, 30B are moved forward to sandwich the steel column 22 from both the left and right sides. At this time, the front end part 31a of the first arm part 31 is in a state where the second arm part 32 can get around to the back side of the steel column 22.

[0052] Next, as shown in FIG. 1, the first arm portion 31 and the second arm portion 32 are automatically slid and the cutting torch 50 is automatically rotated around the tip portion 32a of the second arm portion 32, thereby horizontally plasma cutting the four corners 22a of the steel column 22 as shown in FIG. 4 and FIG. 5. Here, the symbol P in Figures 4 and 5 indicates a plasma cutting section using the steel frame plasma cutting device 1, and the symbol G indicates a gas cutting section performed by an operator. Also, the arrow F in Figure 5 indicates the moving direction (cutting direction) of the cutting torch 50.

[0053] In the steel frame plasma cutting device 1, by storing information such as the cutting position, cutting distance, and thickness of the steel frame member 20 in advance in the above-mentioned control unit (not shown), the arm unit 30 and cutting torch 50 can be controlled to move automatically and cut.

[0054] In this way, using the steel plasma cutting device 1, the cutting torch 50 is moved along the steel column 22 of the building, and the steel column 22 is cut into blocks by plasma cutting and cut out. That is, each corner 22a of the steel column 22 is plasma cut horizontally by the cutting torch 50 to form a plasma cut portion P, and then the block-shaped portion of the steel column 22 to be cut out is suspended and supported by a lifting facility such as a crane. Next, a worker uses gas cutting horizontally between the plasma cut sections P to form gas cut sections G, thereby cutting out the block-shaped steel column 22, and carrying it out in a suspended state for dismantling.

[0055] Next, a construction procedure for cutting the steel beam 21 and dismantling it into blocks will be described. The steel beam 21 is dismantled by cutting it in a substantially vertical direction to divide the block-shaped steel beam 21 in the horizontal direction, as shown in Figs. 6 to 10.

[0056] As shown in Figures 6 and 7, the steel plasma cutting device 1 is arranged so that it travels on the travel section and the cutting torch 50 can automatically move up and down at a predetermined cutting height of the steel beam 21. That is, for example, the arm section 30 is arranged at a predetermined height together with the base 40 by using the up and down lifting function of the load-handling claws of a forklift (travel section). Next, the steel plasma cutting device 1 is fixed to the steel beam 21 to be cut by using the clamp section 35 provided on the support 36. That is, the fixed clamp 351 of the clamp section 35 is arranged above the lower flange 21b and the lower flange 21b is clamped from below by the movable clamp 352, whereby the steel plasma cutting device 1 is fixed to the steel beam 21 to be cut.

[0057] Next, as shown in Fig. 1, the rotational movement of the rotation support part 33 of the first arm part 31, the sliding movement of the first arm part 31 and the second arm part 32, and the rotational movement of the cutting torch 50 about the tip part 32a of the second arm part 32 are automatically performed, thereby cutting two places on the left and right sides in an oblique upward and downward direction as shown in Fig. 8 and Fig. 9. That is, when cutting the steel beam 21, the cutting torch 50 is moved so as to cut up at an angle in a direction intersecting the vertical direction of the steel beam 21, to perform plasma cutting. Here, the symbol P in Figures 9 and 10 indicates a plasma cutting section using the steel frame plasma cutting device 1, and the symbol G indicates a gas cutting section performed by an operator. Also, the arrow F in Figure 10 indicates the moving direction (cutting direction) of the cutting torch 50.

[0058] In this way, using the steel beam plasma cutting device 1, the cutting torch 50 is moved along the steel beam 21 of the building, and the steel beam 21 is cut into blocks by plasma cutting and cut out. That is, at two locations on the left and right of the steel beam 21 to be cut, the cutting torch 50 is used to cut up the steel beam 21 leaving the upper part uncut, thereby forming the plasma cut portion P, and the block-shaped portion of the steel beam 21 to be cut out is then supported by suspending it with a lifting device such as a crane. Next, the upper part of the plasma cut portion P is gas-cut by a worker to cut up and form a gas-cut portion G, thereby cutting out a block-shaped steel beam 21, which is then carried out in a suspended state for dismantling.

[0059] Next, the operation of the above-mentioned steel frame plasma cutting method will be described in detail with reference to the drawings. The steel frame plasma cutting method according to this embodiment includes a steel frame plasma cutting device 1 having a cutting torch 50 for plasma cutting and an arm unit 30 with the cutting torch 50 attached to the arm tip. The steel frame plasma cutting method uses the steel frame plasma cutting device 1 to move the cutting torch 50 along the steel frame members 20 that constitute the steel frame beams 21 and steel frame columns 22 of a building, and cuts and cuts out the steel frame members 20 into blocks by plasma cutting.

[0060] In addition, in this embodiment, the steel frame plasma cutting device 1 equipped with the cutting torch 50 that generates plasma is installed near the cutting position of the steel frame member 20, and the cutting torch 50 is moved along the cutting position by the arm unit 30, thereby plasma cutting the steel frame member 20. In this way, the cutting torch 50 that performs plasma cutting, which has a faster cutting speed than gas cutting, can be moved mechanically by the arm unit 30, so that the work by professional cutters can be reduced and the work efficiency can be improved. In addition, since it is plasma cutting, there is no need for laborious work and adjustments by workers such as adjusting air, adjusting gas, and ignition as in conventional gas cutting, and the work can be performed efficiently. Therefore, in this embodiment, the steel frame members 20 can be cut with simple operations, improving work efficiency and reducing the time required for the operations. Therefore, by adopting the steel frame plasma cutting device 1 of the present invention in the block dismantling method of the steel frame members 20, the steel frame members 20 can be efficiently cut into blocks and dismantled.

[0061] In this embodiment, the moving speed of the cutting torch 50 moved by the arm unit 30 is changed according to the thickness of the steel frame member 20. Therefore, the moving speed of the cutting torch 50 can be changed according to the thickness of the steel frame member 20. For example, when the thickness of the steel frame member 20 is large, the speed is reduced and the cutting torch 50 is moved to cut the steel frame member 20. By controlling the moving speed of the cutting torch 50 according to the thickness in this way, efficient and reliable cutting can be performed.

[0062] In this embodiment, air is blown toward the dross that is generated during cutting by the cutting torch 50. Therefore, dross that occurs during cutting and accumulates in gaps in the cut portion of the steel frame member 20 can be blown away by the blown air, and the gaps are secured to perform reliable cutting. In this way, dross can be prevented from accumulating in the cut portion of the steel frame member 20, making it possible to perform upward cutting with the cutting torch 50 facing upward.

[0063] In addition, in this embodiment, the movement pattern of the cutting torch 50 is switched between when cutting the steel beam 21 and when cutting the steel column 22. Therefore, the cutting torch 50 can be moved in accordance with the cutting positions in both the steel beam 21 and the steel column 22 of the steel member 20 to perform cutting.

[0064] In addition, in this embodiment, when cutting the steel beam 21, it is preferable to cut by moving the cutting torch 50 so as to cut upward at an angle in a direction intersecting the vertical direction of the steel beam 21.

[0065] In this case, the cut portion of the cut steel beam 21 is angled to intersect in the vertical direction, so that the cut block-shaped steel beam 21 can be easily lifted upward and removed, thereby improving the efficiency of construction work.

[0066] In addition, this embodiment includes a process of plasma cutting the steel beam 21 by cutting up using a cutting torch 50 while leaving the upper part, a process of suspending and supporting the block-shaped portion of the steel beam 21 to be cut out, and a process of gas-cutting the upper part to cut out the block-shaped steel beam 21. Therefore, only the upper part of the steel beam 21, which is the final cutting part to cut out the steel beam 21 into a block, can be cut reliably and carefully by the worker, and the remaining part except for the upper part can be efficiently cut by plasma cutting by automatically moving the cutting torch 50 using the steel beam plasma cutting device 1, so that the work of cutting the steel beam 21 into blocks can be performed efficiently and precisely.

[0067] In addition, in this embodiment, when cutting the steel column 22, the cutting torch 50 is moved horizontally across the steel column 22 to cut it. Therefore, by moving the cutting torch 50 horizontally to cut the steel column 22 horizontally, the cut block-shaped steel column 22 can be lifted upward and easily removed, thereby making construction more efficient.

[0068] In addition, this embodiment includes a process of plasma-cutting each corner 22a of the steel column 22 horizontally using a cutting torch 50, a process of suspending and supporting a block-shaped portion of the steel column 22 to be cut out, and a process of gas-cutting the area between the corners 22a horizontally to cut out the block-shaped steel column 22. Therefore, the final cutting part for cutting out the steel column 22 into blocks, which is between the corners 22a of the steel column 22, can be done reliably and carefully by workers, and the remaining parts except for the parts between the corners 22a can be efficiently cut by plasma cutting using the steel frame plasma cutting device 1, which automatically moves the cutting torch 50.As a result, the work of cutting the steel column 22 into blocks can be performed efficiently and precisely.

[0069] In this embodiment, the cutting torch 50 can be moved by remote control using a mobile terminal. Therefore, the steel frame plasma cutting device 1 can be easily operated remotely using the mobile terminal. Therefore, the moving state of the cutting torch 50 can be confirmed from the surroundings while operating, so that cutting can be performed with high accuracy.

[0070] As described above, in the steel frame plasma cutting method according to this embodiment, mechanization allows the steel frame member 20 to be cut with simple operations without relying on specialized workers, improving work efficiency and reducing the time required for work.

[0071] The above describes an embodiment of the steel frame plasma cutting method according to the present invention, but the present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the invention.

[0072] For example, in this embodiment, the case where the steel beams 21 and the steel columns 22 are cut and dismantled into blocks has been described, but the present invention is not limited to this and can be applied to a building in which at least one of the steel beams 21 and the steel columns 22 is the steel member 20. In addition, the present invention can be applied even if no holes are formed in the webs 21a of the steel beams 21, as in this embodiment. Furthermore, it is of course possible to use the steel plasma cutting device 1 of this embodiment for cutting and dismantling structures other than beams and columns, including H-shaped steel materials, for example.

[0073] In addition, in the present embodiment, a forklift is shown as an example of the traveling unit, but the traveling unit is not limited to a forklift and may be another traveling machine. For example, the base 40 itself may be the traveling unit.

[0074] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0075] 1 Steel Plasma Cutting Equipment 20 Steel members 21 Steel beam 22 Steel column 22a Corner 30, 30A, 30B Arm section 31 First arm section 32 Second arm section 33 Rotation support part 35 Clamp section 40 Foundations 50 cutting torch P Plasma cutting part G Gas cutting section X1 Anteroposterior direction X2 Left / right direction J1 1st direction J2 2nd direction

Claims

1. A steel frame plasma cutting device having a cutting torch for plasma cutting and an arm part having the cutting torch at the arm tip part, A steel plasma cutting method using the steel plasma cutting device, moving the cutting torch along the steel components that constitute the steel beams and steel columns of a building, and cutting and cutting out the steel components into blocks by plasma cutting.

2. 2. The steel frame plasma cutting method according to claim 1, wherein a moving speed of the cutting torch moved by the arm portion is changed according to a thickness of the steel frame member.

3. The steel frame plasma cutting method according to claim 1, further comprising blowing air toward dross produced during cutting with the cutting torch.

4. The steel plasma cutting method according to claim 1, wherein a movement pattern of the cutting torch is switched between when cutting the steel beam and when cutting the steel column.

5. 2. The steel frame plasma cutting method according to claim 1, wherein when cutting the steel frame beam, the cutting torch is moved so as to cut upward at an angle in a direction intersecting the vertical direction of the steel frame beam.

6. a step of plasma cutting the steel beam by cutting up the steel beam with the cutting torch while leaving the upper part of the steel beam; A step of suspending and supporting a block-shaped portion of the steel beam; A step of gas-cutting the upper portion to cut out the block-shaped steel beam; The steel frame plasma cutting method according to claim 1 or 5, comprising:

7. 2. The steel frame plasma cutting method according to claim 1, wherein when cutting the steel frame column, the cutting torch is moved horizontally to cut the steel frame column.

8. horizontally plasma cutting each corner of the steel column with the cutting torch; A step of suspending and supporting a block-shaped portion of the steel column; A step of gas-cutting between the corners in a horizontal direction to cut out the block-shaped steel column; The steel frame plasma cutting method according to claim 1 or 7, comprising:

9. The steel frame plasma cutting method according to claim 1, wherein the cutting torch is movable by remote control using a mobile terminal.

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