Temporary road surface demolition method

Abstract

To provide a method for dismantling a temporary road surface, which can improve the efficiency of work related to the dismantling of the temporary road surface. [Solution] A method for dismantling a temporary road surface comprising a plurality of plate-shaped floor plates and connecting plates arranged to span a plurality of the floor plates, the connecting plates being welded to the surface of each of the plurality of floor plates to connect the plurality of floor plates, with welds formed along at least a portion of the edges, and the connection between the plurality of floor plates can be released by a melting process for melting the welds and a separation process for separating the connecting plates and the floor plates after the melting process, and the melting process simultaneously involves both a process of melting the welds with an arc generated toward the welds and a process of blowing away the molten welds with a jet of compressed air.

Description

[Technical field]

[0001] The present invention relates to a method for dismantling a temporary road surface comprising a plurality of plate-shaped floor plates and connecting plates arranged so as to span the plurality of floor plates. [Background technology]

[0002] FIG. 9(a) is a partial cross-sectional view of the temporary road surface 110 showing the flat plate 130 welded to the surface of the floor plate 120, and FIG. 9(b) is a partial cross-sectional view of the temporary road surface 110 after the welded portion 140 has been cut in the cutting process of the conventional demolition method. The conventional temporary road surface 110 is laid on an installation surface such as a floor surface or ground on which vehicles such as light vehicles and heavy machinery run at a work site such as a warehouse or a construction site, and contributes to protecting the installation surface and improving the running performance of the vehicles. The temporary road surface 110 includes a plurality of floor plates 120 laid side by side on the installation surface, and a plurality of flat plates 130 connecting the plurality of floor plates 120. In detail, the flat plate 130 is laid across the surfaces of the adjacent floor plates 120 and welded to the surfaces of the floor plates 120 to connect the adjacent floor plates 120, thereby suppressing the occurrence of displacement of the floor plates 120 due to the running of the vehicles (see paragraph

[0002] of Patent Document 1, etc.). Such a flat plate 130 may be welded to the surface of the floor plate 120 so that a weld 140 is formed on at least a portion of the edge, or may be welded to the surface of the floor plate 120 so that a weld 140 is formed around the entire circumference of the edge, and the weld 140 is also formed on a portion of the surface of the floor plate 120 that is melted during welding and on a portion of the bottom side of the edge of the flat plate 130, as shown in Figure 9(a).

[0003] When the temporary road surface 110 is no longer needed, the connection by the flat plate 130 is released and the flat plate 120 is dismantled into individual floor plates 120. Conventional methods for dismantling the temporary road surface 110 include, for example, a fusing step in which the flat plate 130 is fusing to release the connection between adjacent floor plates 120. In the case of such a dismantling method, the flat plate 130 must be removed from the floor plate 120 at the destination of the floor plate 120 and the surface of the floor plate 120 must be repaired to a flat surface. For example, when the floor plate 120 is returned to the leasing company, repair costs are required and the melted flat plate 130 is discarded. In addition, in order to reduce the repair costs and enable the reuse of the flat plate 130, as shown in FIG. 9(b), a dismantling method may be used in which the welded portion 140 is melted instead of the flat plate 130, and the flat plate 130 is removed from the floor plate 120. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 06-035505 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional fusing process, so-called gas fusing is used, in which a flame from a mixture of gas and oxygen is applied to the welded portion 140, and because the fusing surface of gas fusing is tapered and generally V-shaped, it is difficult to fusing only the welded portion 140 on the floor plate 120 without melting the surface of the floor plate 120 (without forming scratches on the floor plate 120 that would dent the surface), and in the first place, it takes a long time to fusing the welded portion 140 using gas fusing, which could reduce the efficiency of the work of dismantling the temporary road surface 110. Furthermore, if the surface of the floor plate 120 melts, a repair process must be carried out to fill in the gap, which could excessively reduce the efficiency of the work of dismantling the temporary road surface 110. Furthermore, when gas cutting is used, which has a substantially V-shaped weld cross section, a large amount of weld 140 remains on the surface of the deck 120, and a removal process must be carried out to remove this using a grinding machine such as a grinder. This process also takes a significant amount of time, which could further reduce the efficiency of the work of dismantling the temporary road surface 110.

[0006] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a method for demolition of a temporary road surface that can improve the efficiency of work related to the demolition of the temporary road surface. [Means for solving the problem]

[0007] Effective solutions for achieving the above-mentioned object are shown below. The operation and other details are explained as necessary. For ease of understanding, the corresponding configurations and other details are also shown in the embodiments of the invention as appropriate, but are not intended to be limiting.

[0008] In order to achieve the above object, according to the invention according to claim 1, A method for dismantling a temporary road surface comprising a plurality of plate-shaped floor plates and connecting plates provided across the plurality of floor plates, The connecting plate is welded to the surface of each of the plurality of floor plates to connect the plurality of floor plates, and a weld is formed along at least a part of an edge of the connecting plate; a fusing step of fusing the welded portion; a separation step of separating the connecting plate and the floor plate after the fusing step, thereby making it possible to release the connection between the plurality of floor plates; In the melting step, a process of melting the welded portion by an arc generated toward the welded portion; and blowing off the molten welded portion by jetting compressed air. It is characterized by:

[0009] According to the demolition method of the invention according to claim 1 of the present invention, in the cutting process, the process of melting the welded part by an arc generated toward the welded part and the process of blowing off the molten welded part by a jet of compressed air are both performed simultaneously, so that the surface of the floor plate exposed as the welded part is cut can be visually confirmed, and only the welded part on the floor plate can be cut easily without melting the surface of the floor plate (without forming scratches on the floor plate that would dent the surface), and since the output is higher than that of conventional gas cutting, the time required to cut the welded part can be shortened, and the efficiency of the work related to the demolition of the temporary road surface can be improved. In addition, since the welded surface of the welded part is approximately U-shaped, the amount of the welded part remaining on the surface of the floor plate can be reduced, and the time required to remove the remaining welded part can be shortened, and the efficiency of the work related to the demolition of the temporary road surface can be improved.

[0010] The demolition method according to claim 2, The thickness of the connecting plate is less than half the thickness of the sole plate. It is characterized by:

[0011] According to the method for dismantling temporary road surfaces of the invention relating to claim 2 of the present invention, the thickness of the connecting plate is made less than half the thickness of the floor plate. Therefore, even if the floor plate and the connecting plate are made of the same material, in the cutting process, the floor plate is more difficult to melt than the connecting plate due to the influence of thermal conduction, etc., and only the welds on the floor plate can be easily cut without melting the surface of the floor plate (without forming scratches on the floor plate that would cause a dent in the surface), thereby making it possible to further improve the efficiency of work related to dismantling temporary road surfaces.

[0012] The demolition method according to claim 3, The cutting step is carried out in a state where a wall material for receiving the welded portion blown off by the jet of compressed air is placed on the base plate. It is characterized by:

[0013] According to the method for dismantling a temporary road surface of the invention as claimed in claim 3 of the present invention, the cutting process is carried out with a wall material placed on the decking to receive the welded parts blown away by the compressed air jet. Therefore, the welded parts blown away by the compressed air jet are effectively received by the wall material, which prevents accidents such as the molten, hot welded parts coming into contact with other workers and also makes it easier to clean up the blown away welded parts. Effect of the Invention

[0014] In this way, the temporary road surface demolition method of the present invention can improve the efficiency of work related to the demolition of the temporary road surface. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic perspective view showing a temporary road surface according to one embodiment. [Diagram 2] 1 is a partial cross-section of the temporary road surface showing a flat plate welded to the surface of the decking. [Diagram 3] 2 is a flowchart showing a demolition method according to the present embodiment. [Figure 4] FIG. 2 is a schematic perspective view showing an example of an arc fusing device used in the fusing step. [Diagram 5] 1 is a partial cross-sectional view of a temporary road surface after a weld has been cut in the cutting process of the demolition method of this embodiment. FIG. [Figure 6] FIG. 11 is a partial cross-sectional view of the temporary road surface after the welded portion has been cut in a cutting process of a more preferred embodiment. [Figure 7] 13 is a flowchart showing a demolition method according to another embodiment. [Figure 8]FIG. 2A is a schematic front view showing a mounting jig that can be used in a fusion cutting process, and FIG. 2B is a schematic side view showing the same mounting jig. [Figure 9] (a) is a partial cross-sectional view of the temporary road surface showing a flat plate welded to the surface of the decking, and (b) is a partial cross-sectional view of the temporary road surface after the welds have been cut in the cutting process of the conventional demolition method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A temporary road surface 1 according to one embodiment will be described in detail with reference to the drawings. First, the overall configuration of the temporary road surface 1 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic perspective view of the temporary road surface 1 according to one embodiment.

[0017] As shown in Fig. 1, the temporary road surface 1 of this embodiment includes a plurality of floor plates 2, 2 that are installed along a vehicle travel path on an installation surface X such as an outdoor ground surface or an indoor floor surface, and a plurality of connecting plates 3, 3 (hereinafter, may be referred to as flat plates 3, 3) that are welded to the floor plates 2 and connect adjacent floor plates 2, 2. The temporary road surface 1 is a temporary road surface that is laid on the ground for vehicles such as heavy machinery to run on outdoors, such as at a construction site, and is dismantled and removed when it becomes unnecessary due to the completion of construction work, etc. (the connection by the flat plates 3 is released, and each of the floor plates 2 is removed from the installation surface X (ground)). The temporary road surface 1 is a temporary road surface that is laid on a floor surface for vehicles for work to run on indoors, such as at a warehouse, and is dismantled and removed when it becomes unnecessary due to the expiration of its useful life, etc. (the connection by the flat plates 3 is released, and each of the floor plates 2 is removed from the installation surface X (floor)).

[0018] The floor plate 2 is a rectangular plate made of metal such as iron. The size of the floor plate 2 may be determined according to the state of the installation surface X (particularly the state of unevenness, etc.), the state of the running vehicle (particularly the state of weight, speed, etc.), the deformability of the floor plate 2 against the load, etc., and may be, for example, formed to have a long side of 6.0 m, a short side of 1.5 m, and a thickness of about 1.5 cm to 3.0 cm. By laying such a floor plate 2 on the installation surface X, it is possible to prevent the installation surface X from being damaged as the vehicle runs, and to increase the running stability of the vehicle by covering the unevenness of the installation surface X (see depression X1 in FIG. 1).

[0019] The flat plate 3 is formed of a metal such as iron into a plate shape, similar to the floor plate 2. The flat plate 3 may be formed into a long rectangular or square plate shape, but may also be formed into a triangular or circular plate shape, for example. The flat plate 3 is placed on the surfaces (upper surfaces) of the floor plates 2, 2 so as to span the adjacent floor plates 2, 2, and is then welded to the surfaces (upper surfaces) of the floor plates 2, 2 to connect the adjacent floor plates 2, 2. Such a flat plate 3 can prevent the floor plate 2 from shifting position even if the floor plate 2 is subjected to an impact from a vehicle traveling on the temporary road surface 1. It is preferable that the flat plate 3 be formed into a plate shape having a thickness of, for example, 0.7 cm or less, from the viewpoint of reducing unevenness on the temporary road surface 1 and improving vehicle travelability.

[0020] Fig. 2 is a partial cross-sectional view of the temporary road surface 1 showing the flat plate 3 welded to the surface of the floor plate 2. As shown in Fig. 1 or 2, in the assembly method for assembling the temporary road surface 1, in the welding step for welding the flat plate 3 and the floor plate 2 together, it is sufficient that the flat plate 3 is welded to the surface of the floor plate 2 so that a welded portion 4 is formed along the outer edge of the flat plate 3, or the flat plate 3 may be welded to the surface of the floor plate 2 so that a welded portion 4 is formed on at least a part of the outer edge of the flat plate 3. Note that in this embodiment, when the flat plate 3 is welded to the floor plate 2, a part formed by melting and mixing the lower end of the flat plate 3 and a part of the surface of the floor plate 2 is also considered to be part of the welded portion 4.

[0021] In addition, in the temporary road surface 1, the multiple flat plates 3 may be welded to the short sides or long sides of the floor plate 2 at a specified interval, for example 30 cm, or based on the difference in the magnitude of the impact applied to the floor plate 2, such as inside and outside of a position where the vehicle turns, the multiple flat plates 3 may be welded with smaller intervals at positions where a large impact will be applied and with larger intervals at positions where a small impact will be applied, or the multiple flat plates 3 may be welded with smaller intervals at a position where a depression X1 is formed in the installation surface X.

[0022] When the temporary road surface 1 described above is dismantled, the connection between the planks 2, 2 by the flat plate 3 is released, but in the conventional demolition method used for dismantling the temporary road surface 1, a gas cutting process is carried out in which a mixture of gas (acetylene gas, etc.) and air (oxygen) is burned and the flame is directed at the plank 3 along the gap between adjacent planks 2, 2 to melt the plank 3, or a gas cutting process is carried out in which the flame is directed at the welded portion 4 joining the plank 2 and plank 3 to melt the welded portion 4.

[0023] In the conventional demolition method in which a cutting process is carried out to cut the flat plates 3, it is necessary to remove the floor plates 2, transport them to another location, line up the floor plates 2 there, cut the welded parts 4, and remove the flat plates 3 from the floor plates 2. In addition, since the melted surface caused by gas cutting is a tapered V-shape as shown in Fig. 9(b), it is necessary to remove the welded parts 4 remaining in the floor plates 2 in large quantities and repair scratches that have been formed on the surface of the floor plates 2 when the welded parts 4 are cut, which may result in a large burden on the workers and a large amount of time required for dismantling the temporary road surface 1. If the floor plates 3 are returned to the leasing company without being removed from the floor plates 2, there is a risk that the leasing company will be required to pay a large repair fee.

[0024] In addition, in the conventional demolition method in which a cutting process for cutting the welded parts 4 is carried out, the melting surface by gas cutting is a tapered V-shape, so it takes a long time (about 80 seconds when the size of the flat plate 3 is 6 mm thick, 50 mm short side, and 150 mm long side) to melt the welded parts 4 so as not to melt the surface of the floor plate 2, which may reduce the work efficiency of the demolition of the temporary road surface 1. In addition, in the gas cutting process for cutting the welded parts 4, for example, if the welded parts 4 on the flat plate 3 side are cut so that the flat plate 3 can be removed in order to prevent the flat plate 2 from melting, a large amount of the welded parts 4 remains on the flat plate 2, and a removal process is required to scrape off and remove the welded parts 4 remaining on the flat plate 2 using a grinding machine or the like, which takes a long time (about 100 seconds when the size of the flat plate 3 is 6 mm thick, 50 mm short side, and 150 mm long side), which may further reduce the work efficiency of the demolition of the temporary road surface 1. Furthermore, if the surface of the floor plate 2 melts, an additional work process will be required to fill in the gaps so that the molten surface of the floor plate 2 becomes flat, which may excessively reduce the work efficiency of dismantling the temporary road surface 1.

[0025] In the following, in order to solve such problems, a description will be given of a dismantling method S for the temporary road surface 1. Note that detailed description of the same components as those of the above-mentioned temporary road surface 1 will be omitted.

[0026] The demolition method S for the temporary road surface 1 includes a fusing step S1 for fusing the welded portion 4 formed along at least a part of the edge of the flat plate 3, and a separation step S2 for separating the flat plate 3 from the floor plate 2 after the fusing step S1. The demolition method S may further include a cleaning step for washing away deposits such as sand and mud adhering to the surface of the floor plate 2, and the cleaning step may be performed before the fusing step S1 or after the separation step S2. In the demolition method S of this embodiment, the cleaning step is performed first, and the following steps will be described assuming that no deposits such as dust and soil remain on the surface of the floor plate 2.

[0027] Fig. 3 is a flow chart showing the demolition method S of this embodiment. As shown in Fig. 3, in the demolition method S of this embodiment, after the melting step S1 is performed on one of the flat plates 3 among the plurality of flat plates 3, the separation step S2 is performed on the flat plate 3, and then, if there is a flat plate 3 on which the melting step S1 and the separation step S2 have not been performed, the melting step S1 and the separation step S2 are performed on the flat plate 3. According to such a demolition method S, the melting step S1 and the separation step S2 can be reliably performed on each flat plate 3, and the efficiency of the work related to the demolition of the temporary road surface 1 can be improved.

[0028] In the fusing step S1 of this embodiment, both a process of melting the welded portion 4 by an arc generated toward the welded portion 4 and a process of blowing away the molten welded portion 4 by jetting compressed air are performed simultaneously. Fig. 4 is a schematic perspective view showing an example of an arc fusing device 10 used in the fusing step S1. In the fusing step S1, for example, an arc fusing device 10 as shown in Fig. 4 is used to fusing the welded portion 4.

[0029] The arc fusing device 10 is a so-called air gouging device, which has been used in the process of grinding (scraping) a welded portion to form a generally U-shaped groove-shaped welded surface when there is a welding defect such as a flaw on the surface or inside of the welded portion when plate materials are butt-welded together, and is not generally used in the assembly method of a temporary road surface 1 in which a flat plate 3 is overlapped and welded to a floor plate 2. The arc fusing device 10 includes a device main body 11, a connecting part 12 connected to the device main body 11 to supply electricity and compressed air to the device main body 11, a supply line 13 connecting the connecting part 12 to a power source or an air compressor, a rod-shaped gouging rod 16 containing titanium, a gouging torch 14 provided on the device main body 11 to clamp and fix the gouging rod 16, and a plurality of blowing ports 15 provided on the device main body 11 to spray compressed air.

[0030] According to the above-mentioned arc cutting apparatus 10, an arc is generated from the tip of the gouging rod 16 toward the test piece 17 to melt a part of the surface of the test piece 17, and compressed air is ejected from the nozzle 15 toward the molten test piece 17 to blow away the molten test piece 17, and a groove with a substantially U-shaped molten surface can be formed on the surface of the test piece 17 so that the molten test piece 17 does not remain on the test piece 17. The arc cutting apparatus 10 for forming a groove with a substantially U-shaped molten surface on the test piece 17 has conventionally been used when it is necessary to chip (shave) a part of a welded part when a welding defect occurs such as a flaw in the welded part.

[0031] Fig. 5 is a partial cross-sectional view of the temporary road surface 1 after the welded parts 4 have been cut in the cutting process S1 of the demolition method S of this embodiment. According to the cutting process S1 of this embodiment, as shown in Fig. 5, the welded parts 4 are sequentially melted by an arc, and the molten welded parts 4 can be sequentially blown off from the floor plate 2 by compressed air. Furthermore, according to the cutting process S1 of this embodiment, since the welded parts 4 are melted using an arc, the welded parts 4 can be cut in a shorter time (about 50 seconds when the size of the flat plate 3 is 6 mm thick, 50 mm short side, and 150 mm long side) than when the welded parts 4 are melted using a conventional gas, and the efficiency of the work related to the demolition of the temporary road surface 1 can be improved.

[0032] Furthermore, because the fusion surface when an arc is generated toward the welded portion 4 is formed into a substantially U-shape, in the fusion cutting step S1 of this embodiment, the distance between the tip of the gouging rod 16 and the surface of the floor plate 2 is maintained at a preset distance, so that only the welded portion 4 can be fused so that the bottom surface of the fusion surface is flush with the surface of the floor plate 2. As a result, it is possible to prevent the welded portion 4 from remaining on the floor plate 2 after the fusion cut, and a removal step for removing the welded portion 4 from the floor plate 2 is unnecessary, thereby improving the efficiency of work related to dismantling the temporary road surface 1.

[0033] The width of the bottom of the molten surface when an arc is generated toward the welded portion 4 is particularly proportional to the thickness of the gouging rod 16, and the gouging rod 16 used in this embodiment is preferably made of titanium and has a diameter of, for example, 10 mm to 20 mm. The molten surface when such a gouging rod 16 is used forms a substantially U-shaped groove having a width of, for example, 12.0 mm to 22.0 mm. The distance from the bottom of the molten surface to the tip of the gouging rod 16 when an arc is generated toward the welded portion 4 is preset particularly proportional to the output current, and the output current used in this embodiment is preferably 100 A to 600 A.

[0034] The demolition method S of this embodiment is preferably used to demolish a temporary road surface 1 in which the thickness of the flat plate 3 is smaller than the thickness of the floor plate 2. In such a case, even if the floor plate 2, the connecting plate 3, and the welded portion 4 are made of the same material, the heat applied to the surface of the floor plate 2 can be conducted horizontally and downward, so that in the melting step S1, the floor plate 2 is more difficult to melt than the flat plate 3 and the welded portion 4 due to the influence of heat conduction, and only the welded portion 4 on the floor plate 2 can be melted easily without melting the surface of the floor plate 2 (without forming scratches on the floor plate 2 that would dent the surface), and the work involved in demolition of the temporary road surface 1 can be made even more efficient.

[0035] 6 is a partial cross-sectional view of the temporary road surface 1 after the welded portion 4 is cut in the cutting step S1 of the demolition method S of a more preferred embodiment. In the cutting step S1 of this embodiment, the tip of the gouging rod 16 is moved along the longitudinal direction of the welded portion 4, and the welded portion 4 is cut along the longitudinal direction. In the cutting step S1 of the demolition method S of a more preferred embodiment, if the welded portion 4 remains on the floor plate 2 after the welded portion 4 is cut, the remaining welded portion 4 may be further cut, and the welded portion 4 remaining on the floor plate 2 can be efficiently removed, making the subsequent removal step unnecessary. In this case, the distance between the tip of the gouging rod 16 and the surface of the floor plate 2 is maintained so that the bottom surface of the welded surface and the surface of the floor plate 2 are flush with each other, and the welded portion 4 is cut.

[0036] In the cutting process S1 of this embodiment, compressed air is sprayed toward the molten welded portion 4, but any fluid may be sprayed toward the molten welded portion 4 as long as it is capable of blowing away the molten welded portion 4, and may be, for example, a non-flammable gas such as nitrogen or a non-flammable liquid such as water.

[0037] In the melting step S1 using the arc melting device 10, from the viewpoint of preventing the molten welded portion 4 from being blown over a wide area to the surroundings (particularly downstream in the direction of air ejection), it is more preferable to perform an installation step in which a protective wall is installed on a base plate before the melting step S1 is performed, and the protective wall is formed, for example, in a box shape with an open front and bottom. The protective wall can prevent the molten welded portion 4 from colliding with the molten welded portion 4 melted by the arc in the melting step S1 and scattered by the compressed air, causing the molten welded portion 4 to scatter outside the protective wall, preventing accidents such as contact with other workers caused by the molten high-temperature welded portion 4, and also facilitating cleaning of the molten and blown away welded portion 4. The protective wall may be installed downstream of the gouging rod 16 so that its open front faces upstream in the direction of air ejection, and the distance between the tip of the gouging rod 16 and the protective wall may be set appropriately depending on the state in which the molten weld 4 is blown away.

[0038] In the separation step S2 of this embodiment, an impact is applied to the flat plate 3 after the welded portion 4 has been cut off using a tool such as a hammer. This impact separates the flat plate 3 and the welded portion 4 attached to the flat plate 3 from the floor plate 2, and the flat plate 3 and the welded portion 4 attached to the flat plate 3 are removed from the floor plate 2 (about 10 seconds when the flat plate 3 has a thickness of 6 mm, a short side of 50 mm, and a long side of 150 mm). As a result, the time required for the work can be significantly reduced compared to a removal step in which the welded portion 4 attached to the floor plate 2 is scraped off using a grinding machine, and the efficiency of the work related to the dismantling of the temporary road surface 1 can be improved. Note that even if the welded portion 4 on the floor plate 2 is uniformly removed by the cutting step S1, if the welded portion 4 remains on the surface of the floor plate 2, a removal step is performed to repair the surface of the floor plate 2 to a flat surface by applying an impact using a tool such as a hammer so that the floor plate 2 after cutting is flat, or by grinding the surface of the floor plate 2 using a grinding machine.

[0039] Fig. 7 is a flow chart showing a demolition method S of another embodiment. In the demolition method S of the above embodiment, the fusing step S1 is performed on one flat plate 3, and then the separation step S2 is performed. However, as shown in Fig. 7, in the demolition method S of another embodiment, the fusing step S1 is performed on flat plates 3 located in a preset area on the temporary road surface 1, or on all flat plates 3, and then the separation step S2 is performed. In such a demolition method S, the number of times tools are changed between the fusing step S1 and the separation step S2 can be reduced, and the efficiency of the work related to the demolition of the temporary road surface 1 can be improved.

[0040] In the melting step S1 of the demolition method S of the above embodiment, the melting of the welded portion 4 is performed along the longitudinal direction of the welded portion 4 so that the bottom surface of the approximately U-shaped melting surface when an arc is generated toward the welded portion 4 is flush with the surface of the floor plate 2. However, in order to melt the welded portion 4 in this manner, it is necessary to set a preset output current in the arc melting device 10, maintain the distance between the tip of the gouging rod 16 and the surface of the floor plate 2, maintain the position of the tip of the gouging rod 16 relative to the short side direction of the welded portion 4, and move the tip of the gouging rod 16 along the longitudinal direction of the welded portion 4 to melt the welded portion 4. More specifically, the worker must maintain the vertical and front-rear positions of the device body 11 and move the device body 11 along the left-right direction, and such an operation of the device body 11 may place an excessive burden on the worker.

[0041] Fig. 8(a) is a schematic side view showing a mounting jig 20 that can be used in the fusing step S1, and Fig. 8(b) is a schematic front view showing the same mounting jig 20. In order to solve the above-mentioned problems related to the operation of the device body 11, the fusing step S1 may be an embodiment in which a mounting jig 20 on which the device body 11 can be placed is used. As shown in Figs. 8(a) and 8(b), the mounting jig 20 includes a mounting table 21 on which the device body 11 is placed, a main body frame 22 that supports the mounting table 21, and a plurality of rollers 23, 23 provided at the lower end of the main body frame 22.

[0042] The mounting table 21 may be any type as long as the device body 11 can be mounted thereon, and in this embodiment, the mounting table 21 is formed into a semicylindrical shape (a shape obtained by splitting a cylinder vertically) with a semicircular cross section in accordance with the cylindrical outer shape of the device body 11. The mounting table 21 may also be capable of fixing the device body 11 mounted on the mounting table 21, and may be in a form in which the device body 11 can be fixed by fitting it into the mounting table 21, for example.

[0043] The main body frame 22 only needs to support the mounting table 21 at its upper end and be movable in one direction (in the illustration, the left-right direction) on the sole plate 2 by a plurality of rollers 23, 23 journaled at its lower end. The main body frame 22 of this embodiment journals the mounting table 21 at its approximate center from the left-right direction so that the mounting table 21 can swing in the front-rear direction, and is configured to be able to regulate the swinging of the mounting table 21 by a fixing member such as a screw. For example, when melting the welded portion 4, the mounting table 21 can be swung forward to bring the tip of the gouging rod 16 closer to the welded portion 4 to start melting the welded portion 4, or the mounting table 21 can be swung backward to move the tip of the gouging rod 16 away from the welded portion 4 to interrupt or end the melting of the welded portion 4. The height of the main body frame 22 is approximately the same as the distance from the gripping position to the tip of the gouging rod 16, and is preset within a range in which the device body 11 can stably hold the gouging rod 16. Note that the main body frame 22 may be configured in such a way that the height of the main body frame 22 is changeable, for example, by providing an expandable structure to the frame that constitutes the main body frame 22.

[0044] In the melt-cutting process S1 using the above-mentioned mounting jig 20, first, the device body 11 is placed on the mounting table 21 of the mounting jig 20 on the sole plate 2, and the position of the gouging rod 16 held by the device body 11 (the distance between the tip of the gouging rod 16 and the surface of the sole plate 2) is adjusted so that the bottom surface of the approximately U-shaped melting surface when an arc is generated toward the welded portion 4 is flush with the surface of the sole plate 2. Next, the mounting jig 20 is placed on the sole plate 2 so that the tip of the gouging rod 16 is located above the welded portion 4 and in a direction in which the mounting jig 20 moves along the longitudinal direction of the welded portion 4. Thereafter, power and compressed air are supplied to the device body 11, and the mounting jig 20 is moved in one direction (to the right in the figure) according to the melt-cutting speed, etc., and the welded portion 4 is melt-cut along the longitudinal direction. Therefore, in the cutting process S1 using the mounting jig 20 of this embodiment, the worker can easily cut the weld 4 along the longitudinal direction so that the bottom surface of the welded surface and the surface of the base plate 2 are flush without requiring excessive technical skill, thereby reducing the operational burden on the worker. [Explanation of symbols]

[0045] 1 Temporary road surface 2 bottom plate 3 flat plate 4 Welding 10 Arc cutting device 20 Mounting fixture S Demolition method S1 Cutting process S2 separation process

Claims

1. A method for dismantling a temporary road surface comprising a plurality of plate-shaped floor plates and connecting plates provided across the plurality of floor plates, The connecting plate is welded to the surface of each of the plurality of floor plates to connect the plurality of floor plates, and a weld is formed along at least a part of an edge of the connecting plate; a fusing step of fusing the welded portion; a separation step of separating the connecting plate and the floor plate after the fusing step, thereby making it possible to release the connection between the plurality of floor plates; In the melting step, a process of melting the welded portion by an arc generated toward the welded portion; and blowing off the molten welded portion by jetting compressed air. A method for dismantling a temporary road surface.

2. The thickness of the connecting plate is less than half the thickness of the sole plate. A method for dismantling a temporary road surface according to claim 1.

3. The melt-cutting step is carried out in a state where a wall material for receiving the welded portion blown off by the jet of compressed air is placed on the base plate. A method for dismantling a temporary road surface according to claim 1 or 2.

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