Demolition method for temporary road surfaces

Abstract

This invention provides a temporary road surface demolition method that can improve the efficiency of work related to the demolition of temporary road surfaces. [Solution] A method for dismantling a temporary road surface comprising a plurality of plate-shaped base plates and connecting plates provided across a plurality of the base plates, wherein the connecting plates are welded to the surface of each of the plurality of base plates to connect the plurality of base plates, and a welded portion is formed along at least a part of the edge, and the connection of the plurality of base plates can be released by a cutting step of melting the welded portion and a separation step of separating the connecting plate and the base plate after the cutting step, and in the cutting step, both a process of melting the welded portion with an arc generated toward the welded portion and a process of blowing away the molten welded portion by ejecting compressed air are performed simultaneously.

Description

Technical Field

[0001] The present invention relates to a method for disassembling a temporary road surface including a plurality of plate-shaped floorboards and connecting plates provided so as to extend across the plurality of floorboards.

Background Art

[0002] FIG. 9(a) is a partial cross-sectional view of a temporary road surface 110 showing a flat plate 130 welded to the surface of a floorboard 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 a conventional disassembly method. The conventional temporary road surface 110 is laid on an installation surface such as a floor or ground where vehicles such as light vehicles and heavy machinery travel 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. It includes a plurality of floorboards 120 laid side by side on the installation surface and a plurality of flat plates 130 connecting the plurality of floorboards 120. Specifically, the flat plate 130 is stretched across the surfaces of adjacent floorboards 120 and welded to the surfaces of the floorboards 120 to connect the adjacent floorboards 120 and suppress the occurrence of displacement in the floorboards 120 as the vehicle travels (see paragraph

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

[0003] When the temporary road surface 110 described above is no longer needed, it is dismantled into individual base plates 120 by releasing the connections between the flat plates 130. Conventional dismantling methods for the temporary road surface 110 include, for example, a cutting process in which the flat plates 130 are cut to release the connections between adjacent base plates 120. However, in such a dismantling method, it is necessary to remove the flat plates 130 from the base plates 120 at the destination of the base plates 120 and repair the surface of the base plates 120 to make it flat. For example, repair costs are incurred when returning the equipment to the leasing company, and the cut flat plates 130 are discarded. In addition, in order to reduce such repair costs and enable the reuse of the flat plates 130, a dismantling method is sometimes used in which the welded joints 140 are cut instead of the flat plates 130, as shown in Figure 9(b), to remove the flat plates 130 from the base plates 120. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Utility Model Publication No. 06-035505 [Overview of the initiative] [Problems that the invention aims to solve]

[0005] However, conventional cutting processes use so-called gas cutting, which involves applying a flame produced by burning a mixture of gas and oxygen to the welded area 140. Because the cut surface of gas cutting is tapered and roughly V-shaped, it is difficult to cut only the welded area 140 on the base plate 120 without melting the surface of the base plate 120 (without creating any indentations or scratches on the base plate 120). Furthermore, cutting the welded area 140 using gas cutting takes a considerable amount of time, which could reduce the efficiency of the demolition work of the temporary road surface 110. Moreover, if the surface of the base plate 120 is melted, a repair process to fill it in must be carried out, which could excessively reduce the efficiency of the demolition work of the temporary road surface 110. Furthermore, when using gas cutting with a roughly V-shaped welded cross-section, a large amount of welded material 140 remains on the surface of the base plate 120. This necessitates a removal process using a grinding machine such as a grinder to remove the welded material, which also requires considerable time and could further reduce the efficiency of the dismantling work of the temporary road surface 110.

[0006] This invention has been made in view of these circumstances, and its purpose is to provide a method for dismantling temporary road surfaces that can improve the efficiency of work related to the dismantling of temporary road surfaces. [Means for solving the problem]

[0007] The following are effective solutions for achieving the above-mentioned objectives. Explanations of their operation and other aspects will be provided as needed. Furthermore, for ease of understanding, corresponding configurations and other aspects will be shown in the embodiments of the invention as appropriate, but these are not limiting.

[0008] To achieve the above-mentioned objective, according to the invention of claim 1 of the present invention, A method for dismantling a temporary road surface comprising a plurality of plate-shaped base plates and connecting plates provided to span across a plurality of the base plates, The connecting plate is welded to the surface of each of the multiple base plates to connect the multiple base plates, and a welded portion is formed along at least a part of its edge. A cutting step for cutting the welded portion, The connection between the multiple base plates can be released by a separation step that separates the connecting plate and the base plate after the cutting step. In the aforementioned cutting process, A process of melting the welded portion by an arc generated toward the welded portion, The process involves simultaneously performing both the blowing away of the molten welded area by ejecting compressed air, It is characterized by the following:

[0009] According to the demolition method of the invention described in claim 1 of the present invention, in the cutting process, both the process of melting the welded part with an arc generated toward the welded part and the process of blowing away the molten welded part with compressed air are performed simultaneously. As a result, the surface of the base plate exposed as a result of cutting the welded part can be visually inspected, and only the welded part on the base plate can be easily cut without melting the surface of the base plate (without forming scratches on the base plate that would cause indentations on the surface). Furthermore, because it has a higher output than conventional gas cutting, the time required to cut the welded part can be shortened, and the efficiency of work related to the demolition of temporary road surfaces can be improved. In addition, because the cut surface of the welded part is approximately U-shaped, the amount of welded part remaining on the surface of the base plate can be reduced, the time required to remove the remaining welded part can be shortened, and the efficiency of work related to the demolition of temporary road surfaces can be further improved.

[0010] A demolition method according to claim 2, The thickness of the connecting plate is set to be less than or equal to half the thickness of the base plate. It is characterized by the following:

[0011] According to the temporary road surface demolition method of the invention described in claim 2 of the present invention, since the thickness of the connecting plate is less than half the thickness of the base plate, even if the base plate and the connecting plate are made of the same material, the base plate is more difficult to melt than the connecting plate due to the effects of heat conduction, etc., and only the welded part on the base plate can be easily cut without melting the surface of the base plate (without forming scratches on the surface of the base plate that would cause indentations), thereby further improving the efficiency of the work related to the demolition of the temporary road surface.

[0012] The disassembling method according to claim 3, wherein the melting process is carried out with a wall material installed on the floor plate to receive the welded parts blown off by the jet of compressed air. This is the gist.

[0013] According to the disassembling method of the temporary road surface of the invention according to claim 3 of the present invention, since the melting process is carried out with a wall material installed on the floor plate to receive the welded parts blown off by the jet of compressed air, the welded parts blown off by the jet of compressed air can be effectively received by the wall material, accidents such as the molten high-temperature welded parts coming into contact with other workers can be suppressed, and the cleaning of the blown-off welded parts can also be facilitated.

Effect of the Invention

[0014] Thus, in the disassembling method of the temporary road surface of the present invention, the efficiency of the work related to the disassembling of the temporary road surface can be improved.

Brief Description of the Drawings

[0015] [Figure 1] It is a schematic perspective view showing a temporary road surface, which is an embodiment. [Figure 2] It is a partial cross-sectional view of the temporary road surface showing a flat plate welded to the surface of the floor plate. [Figure 3] It is a flowchart showing the disassembling method of the present embodiment. [Figure 4] It is a schematic perspective view showing an example of an arc welding device used in the melting process. [Figure 5] It is a partial cross-sectional view of the temporary road surface after the welded parts are melted in the melting process of the disassembling method of the present embodiment. [Figure 6] It is a partial cross-sectional view of the temporary road surface after the welded parts are melted in the melting process of a more preferable embodiment. [Figure 7] It is a flowchart showing the disassembling method of another embodiment. [Figure 8](a) is a schematic front view showing a mounting jig that can be used in the fusing process, and (b) is a schematic side view showing the same mounting jig. [Figure 9] (a) is a partial cross-sectional view of a temporary road surface showing a flat plate welded to the surface of a floorboard, and (b) is a partial cross-sectional view of the temporary road surface after the welded part has been fused in the fusing process of a conventional dismantling method.

Embodiments for Carrying out the Invention

[0016] The 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 of 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 floorboards 2, 2 installed along the driving path of a vehicle on an installation surface X such as an outdoor ground or an indoor floor surface, and a plurality of connecting plates 3, 3 (hereinafter sometimes referred to as flat plates 3, 3) welded to the floorboards 2 to connect adjacent floorboards 2, 2. The temporary road surface 1 is, for example, a temporary road surface laid on the ground for vehicles such as heavy machinery to drive on outdoors at a construction site or the like, and is disassembled and removed when it becomes unnecessary, such as when the construction work is completed (the connection by the flat plate 3 is released, and each of the floorboards 2 is removed from the installation surface X (the ground)). Also, the temporary road surface 1 is, for example, a temporary road surface laid on the floor for work vehicles to drive on indoors in a warehouse or the like, and is disassembled and removed when it becomes unnecessary due to the passage of the service life or the like (the connection by the flat plate 3 is released, and each of the floorboards 2 is removed from the installation surface X (the floor)).

[0018] The base plate 2 is made of a metal such as iron and formed into a rectangular plate shape. The size of the base plate 2 can be determined according to the condition of the installation surface X (especially the condition of unevenness, etc.), the condition of the vehicle running on it (especially the condition of its weight and speed, etc.), and the deformability of the base plate 2 under load, but for example, it may be formed with a long side of 6.0m, a short side of 1.5m, and a thickness of 1.5cm to 3.0cm. By laying such a base plate 2 on the installation surface X, damage to the installation surface X due to the vehicle's movement can be suppressed, and the unevenness of the installation surface X (see depression X1 in Figure 1) can be covered, thereby improving the vehicle's running stability.

[0019] The flat plate 3 is made of a metal such as iron, similar to the base plate 2, and is formed into a plate shape. The flat plate 3 can be formed into a long rectangular or square shape, but it may also be formed into a triangular or circular shape, for example. The flat plate 3 is placed on the surface (top surface) of the base plates 2, 2 so as to span across adjacent base plates 2, 2, and then welded to the surface (top surface) of the base plates 2, 2 to connect the adjacent base plates 2, 2. Such a flat plate 3 can suppress displacement of the base plates 2 even when impacts from vehicles traveling on the temporary road surface 1 are applied to the base plates 2. Furthermore, from the viewpoint of reducing unevenness on the temporary road surface 1 and improving vehicle drivability, it is preferable that the flat plate 3 be formed into a plate shape with a thickness of 0.7 cm or less.

[0020] Figure 2 is a partial cross-sectional view of the temporary road surface 1 showing a flat plate 3 welded to the surface of a base plate 2. As shown in Figure 1 or Figure 2, in the assembly method for assembling the temporary road surface 1, in the welding process for welding the flat plate 3 to the base plate 2, it is sufficient for the flat plate 3 to be welded to the surface of the base plate 2 such 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 base plate 2 such that a welded portion 4 is formed on at least a part of the outer edge of the flat plate 3. In this embodiment, when welding the flat plate 3 to the base plate 2, the portion formed when the lower end of the flat plate 3 and a part of the surface of the base plate 2 melt and mix together is also considered part of the welded portion 4.

[0021] Furthermore, in the temporary road surface 1, the multiple flat plates 3 may be welded to the short or long sides of the base plate 2 at predetermined intervals, such as 30 cm. Alternatively, based on the difference in the magnitude of the impact applied to the base plate 2, such as inside and outside the turning position of a vehicle, the multiple flat plates 3 may be welded at smaller intervals at positions where a large impact is applied, and at larger intervals at positions where a small impact is applied. Alternatively, the multiple flat plates 3 may be welded at smaller intervals at positions where a recess X1 is formed in the installation surface X.

[0022] When the temporary road surface 1 described above is dismantled, the connection between the base plates 2, 2 by the flat plate 3 is released. However, in conventional dismantling methods used to dismantle the temporary road surface 1, a gas cutting process is performed in which a mixture of gas (such as acetylene gas) and gas (oxygen) is burned, and the flame is applied to the flat plate 3 along the gap between adjacent base plates 2, 2 to melt and cut the flat plate 3, or the gas is applied to the welded joint 4 that joins the base plate 2 and the flat plate 3 to melt and cut the welded joint 4.

[0023] In conventional demolition methods that involve a cutting process to cut the flat plate 3, it is necessary to remove the base plate 2, transport it to another location, arrange the base plate 2 there, and cut the welded joint 4 to remove the flat plate 3 from the base plate 2. Furthermore, as shown in Figure 9(b), because the cut surface created by gas cutting is tapered in a V-shape, it is also necessary to remove the large amount of welded joint 4 remaining on the base plate 2 and repair any scratches on the surface of the base plate 2 caused by cutting the welded joint 4. This could result in a significant burden and time burden on workers for the demolition of the temporary road surface 1. Moreover, if the base plate 2 is returned to the leasing company without removing the flat plate 3, there is a risk of having to pay substantial repair costs to the leasing company.

[0024] Furthermore, in conventional demolition methods that involve a gas cutting process to cut the welded joint 4, the cut surface created by gas cutting is tapered in a V-shape. Therefore, melting the welded joint 4 without melting the surface of the base plate 2 requires a considerable amount of time (approximately 80 seconds for a flat plate 3 with a thickness of 6 mm, a short side of 50 mm, and a long side of 150 mm), which could reduce the efficiency of the demolition of the temporary road surface 1. In addition, in the gas cutting process to cut the welded joint 4, for example, if the welded joint 4 on the flat plate 3 side is cut in order to allow the flat plate 3 to be removed in order to suppress the melting of the base plate 2, a large amount of welded joint 4 remains on the base plate 2. This necessitates a removal process to grind off and remove the remaining welded joint 4 from the base plate 2 using a grinding machine or the like, which requires an even greater amount of time (approximately 100 seconds for a flat plate 3 with a thickness of 6 mm, a short side of 50 mm, and a long side of 150 mm), which could further reduce the efficiency of the demolition of the temporary road surface 1. Furthermore, if the surface of the base plate 2 is melted, an additional step will be required to fill in the molten surface of the base plate 2 so that it becomes flat, which may excessively reduce the efficiency of the demolition work of the temporary road surface 1.

[0025] The following describes the demolition method S for temporary road surface 1, with the aim of resolving these problems. Detailed explanations of configurations similar to those of temporary road surface 1 described above will be omitted.

[0026] The demolition method S for the temporary road surface 1 includes a cutting step S1 for cutting a welded joint 4 formed along at least a portion of the edge of the flat plate 3, and a separation step S2 for separating the flat plate 3 and the base plate 2 after the cutting step S1. The demolition method S may further include a washing step for washing away any attached matter such as sand or mud from the surface of the base plate 2, and this washing step may be performed before the cutting step S1 or after the separation step S2. In the demolition method S of this embodiment, the washing step is performed first, and from the subsequent steps onward, it will be explained assuming that no attached matter such as dust or soil remains on the surface of the base plate 2.

[0027] Figure 3 is a flowchart of the demolition method S of this embodiment. As shown in Figure 3, in the demolition method S of this embodiment, after the cutting process S1 is performed on one of the multiple flat plates 3, the separation process S2 is performed on that flat plate 3. If there are any flat plates 3 that have not yet undergone the cutting process S1 and the separation process S2, then the cutting process S1 and the separation process S2 are performed on those flat plates 3. With this demolition method S, the cutting process S1 and the separation process 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 cutting process S1 of this embodiment, both the process of melting the welded part 4 with an arc generated toward the welded part 4 and the process of blowing away the molten welded part 4 with compressed air are performed simultaneously. Figure 4 is a schematic perspective view showing an example of an arc cutting apparatus 10 used in the cutting process S1. In the cutting process S1, an arc cutting apparatus 10, such as the one shown in Figure 4, is used to cut the welded part 4.

[0029] The arc cutting device 10 is a so-called air gouging device, which is conventionally used in the process of chipping away (shaving) the welded area to form a roughly U-shaped groove when there are welding defects such as scratches on the surface or inside of the welded area when plate materials are butt-welded together. It is a device that is not generally used in the assembly method of temporary road surfaces 1 in which flat plates 3 are layered and welded onto base plates 2. The arc cutting device 10 comprises a device body 11, a connecting part 12 connected to the device body 11 to supply electricity and compressed air to the device body 11, a supply line 13 connecting the connecting part 12 to a power source or air compressor, a rod-shaped gouging rod 16 containing titanium, a gouging torch 14 provided on the device body 11 to clamp and fix the gouging rod 16, and a plurality of outlets 15 provided on the device body 11 to blow out compressed air.

[0030] According to the arc cutting device 10 described above, an arc is generated from the tip of the gouging rod 16 toward the test piece 17 to melt a portion of the surface of the test piece 17, and compressed air is blown from the nozzle 15 toward the molten test piece 17 to blow away the molten test piece 17, thereby forming a groove on the surface of the test piece 17 with a substantially U-shaped molten cross-section so that no molten test piece 17 remains on the test piece 17. The arc cutting device 10 that forms a groove with a substantially U-shaped molten cross-section on the test piece 17 has conventionally been used when welding defects such as scratches occur in the welded area and it is necessary to chip away (shave) a portion of the welded area.

[0031] Figure 5 is a partial cross-sectional view of the temporary road surface 1 after the welded joint 4 has 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 Figure 5, the welded joint 4 is sequentially melted by an arc, and the molten welded joint 4 can be sequentially blown off from the base plate 2 by compressed air. Furthermore, according to the cutting process S1 of this embodiment, since the welded joint 4 is melted using an arc, the welded joint 4 can be cut in a shorter time (approximately 50 seconds when the size of the flat plate 3 is 6 mm thick, 50 mm on the short side and 150 mm on the long side) than when the welded joint 4 is melted using conventional gas, thereby improving the efficiency of the work related to the demolition of the temporary road surface 1.

[0032] Furthermore, since the melting surface formed when an arc is generated toward the welded portion 4 is roughly U-shaped, in the melting process S1 of this embodiment, the distance between the tip of the gouging rod 16 and the surface of the base plate 2 is maintained at a predetermined distance, so that only the welded portion 4 can be melted so that the bottom surface of the melting surface and the surface of the base plate 2 are flush. As a result, it is possible to suppress the retention of the welded portion 4 on the base plate 2 after it has been melted, eliminating the need for a removal process to remove the welded portion 4 from the base plate 2, and improving the efficiency of the work related to the dismantling of the temporary road surface 1.

[0033] The width of the bottom surface of the molten cross-section when an arc is generated toward the weld 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 10 mm to 20 mm. When such a gouging rod 16 is used, the molten cross-section forms a roughly U-shaped groove with a width of, for example, 12.0 mm to 22.0 mm. The distance from the bottom of the molten cross-section to the tip of the gouging rod 16 when an arc is generated toward the weld 4 is particularly set in proportion 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 for the demolition of a temporary road surface 1 in which the thickness of the flat plate 3 is less than the thickness of the base plate 2. In such cases, even if the base plate 2, connecting plate 3, and welded part 4 are made from the same material, the heat applied to the surface of the base plate 2 can be conducted horizontally and downward. Therefore, in the cutting process S1, due to the effect of heat conduction, the base plate 2 is more difficult to melt than the flat plate 3 and welded part 4. This allows for easy cutting of only the welded part 4 on the base plate 2 without melting the surface of the base plate 2 (without forming any scratches on the surface of the base plate 2), thereby further improving the efficiency of the work related to the demolition of the temporary road surface 1.

[0035] Figure 6 is a partial cross-sectional view of the temporary road surface 1 after the welded portion 4 has been cut in the cutting process S1 of a more preferred embodiment of the demolition method S. In the cutting process 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 its longitudinal direction. However, in the cutting process S1 of the more preferred embodiment of the demolition method S, if the welded portion 4 remains on the base plate 2 after being cut, the remaining welded portion 4 may be cut further, allowing for efficient removal of the welded portion 4 remaining on the base plate 2 and eliminating the need for subsequent removal processes. In this case as well, the distance between the tip of the gouging rod 16 and the surface of the base plate 2 is maintained so that the bottom surface of the cut surface and the surface of the base plate 2 are flush, and the welded portion 4 is cut.

[0036] In the cutting process S1 of this embodiment, compressed air is ejected towards the molten weld 4. However, the substance ejected towards the molten weld 4 can be a fluid that can blow away the molten weld 4. For example, it could be a non-combustible gas such as nitrogen or a non-combustible liquid such as water.

[0037] Furthermore, in the cutting process S1 using the arc cutting device 10, it is more preferable that an installation process is carried out in which a protective wall is installed on a base plate before the cutting process S1 is performed, from the viewpoint of suppressing the molten weld 4 from being blown over a wide area to the surroundings (especially downstream of the direction of air ejection). The protective wall is formed, for example, in the shape of a box with an open front and bottom. The protective wall collides with the molten weld 4 that is scattered by the compressed air melted by the arc in the cutting process S1, suppressing the scattering of the molten weld 4 to the outside of the protective wall, thereby suppressing accidents in which the molten, high-temperature weld 4 comes into contact with other workers, and also making it easier to clean the molten and blown-away weld 4. Furthermore, the protective wall should be installed downstream of the gouging rod 16 such 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 should be set appropriately according to the state in which the molten weld 4 is blown away.

[0038] In the separation step S2 of this embodiment, the flat plate 3, after the welded portion 4 has been cut, is subjected to impact 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 base plate 2, and the flat plate 3 and the welded portion 4 attached to the flat plate 3 are removed from the base plate 2 (approximately 10 seconds if the size of the flat plate 3 is 6 mm thick, 50 mm on the short side and 150 mm on the long side). As a result, the time required for the work can be significantly reduced compared to a removal process in which the welded portion 4 attached to the base plate 2 is ground off using a grinding machine, thereby improving the efficiency of the work related to the dismantling of the temporary road surface 1. Even if the welded portion 4 on the base plate 2 has been uniformly removed by the cutting step S1, if any welded portion 4 remains on the surface of the base plate 2, a removal process is carried out to repair the surface of the base plate 2 to a flat state by applying impact using a tool such as a hammer to make the surface of the base plate 2 flat after cutting, or by grinding the surface of the base plate 2 using a grinding machine.

[0039] Figure 7 is a flowchart of another embodiment of the demolition method S. In the above embodiment of the demolition method S, the cutting process S1 was performed on one flat plate 3, followed by the separation process S2. However, as shown in Figure 7, in the other embodiment of the demolition method S, the cutting process S1 is performed on flat plates 3 located in a predetermined area on the temporary road surface 1, or on all flat plates 3, followed by the separation process S2. In such a demolition method S, the number of times tools need to be changed between the cutting process S1 and the separation process 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 cutting process S1 of the demolition method S of the above embodiment, it was explained that the welded part 4 is cut along the longitudinal direction of the welded part 4 so that the bottom surface of the substantially U-shaped cut surface when an arc is generated toward the welded part 4 is flush with the surface of the base plate 2. However, in order to cut the welded part 4 in this way, it is necessary to set a preset output current in the arc cutting device 10, maintain the distance between the tip of the gouging rod 16 and the surface of the base plate 2, maintain the position of the tip of the gouging rod 16 relative to the short direction of the welded part 4, and move the tip of the gouging rod 16 along the longitudinal direction of the welded part 4 to cut the welded part 4. More specifically, the operator must maintain the vertical and horizontal position of the device body 11, as well as move the device body 11 along the left and right directions, and such operation of the device body 11 may place an excessive burden on the operator.

[0041] Figure 8(a) is a schematic side view showing a mounting jig 20 that can be used in the cutting process S1, and Figure 8(b) is a schematic front view showing the same mounting jig 20. In order to solve the above problems related to the operation of the apparatus body 11, a mounting jig 20 on which the apparatus body 11 can be mounted may be used in the cutting process S1. As shown in Figures 8(a) and 8(b), the mounting jig 20 comprises a mounting base 21 on which the apparatus body 11 is mounted, a main frame 22 that supports the mounting base 21, and a plurality of rollers 23, 23 provided at the lower end of the main frame 22.

[0042] The mounting base 21 only needs to be capable of supporting the device body 11. In this embodiment, the mounting base 21 is formed in a semi-cylindrical shape with a semicircular cross-section (a shape obtained by splitting a cylinder vertically) in accordance with the cylindrical outer shape of the device body 11. The mounting base 21 may also be capable of fixing the device body 11 placed on it. For example, the device body 11 may be fitted into the mounting base 21 to fix the device body 11 in place.

[0043] The main frame 22 only needs to be able to move in one direction (left-right direction in the illustration) on the base plate 2 by supporting the mounting table 21 at its upper end and by a plurality of rollers 23, 23 pivotally supported at its lower end. In this embodiment, the main frame 22 is configured such that the mounting table 21 can swing in the front-rear direction, with its approximate center pivotally supported from the left and right directions, and the swinging of the mounting table 21 can be restricted by fixing members such as screws. For example, when cutting a welded part 4, it is possible to swing the mounting table 21 forward to bring the tip of the gouging rod 16 closer to the welded part 4 and start cutting the welded part 4, or to swing the mounting table 21 backward to move the tip of the gouging rod 16 away from the welded part 4 and interrupt or end the cutting of the welded part 4. In addition, the height of the main 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. Furthermore, the main frame 22 may be configured such that, for example, the frame constituting the main frame 22 is provided with an expandable / contractable structure so that the height of the main frame 22 can be changed.

[0044] In the welding process S1 using the mounting jig 20 described above, first the main body of the apparatus 11 is placed on the mounting base 21 of the mounting jig 20 on the base plate 2, and the position of the gouging rod 16 held by the main body of the apparatus 11 (the distance between the tip of the gouging rod 16 and the surface of the base plate 2) is adjusted so that the bottom surface of the roughly U-shaped welding cross-section when an arc is generated toward the weld 4 is flush with the surface of the base plate 2. Next, the mounting jig 20 is placed on the base plate 2 so that the tip of the gouging rod 16 is positioned above the weld 4, and the mounting jig 20 moves in a direction along the longitudinal direction of the weld 4. After this, power and compressed air are supplied to the main body of the apparatus 11, and the mounting jig 20 is moved in one direction (to the right in the figure) according to the welding speed, etc., and the weld 4 is welded along its longitudinal direction. Therefore, in the welding process S1 using the mounting jig 20 of this embodiment, the welded portion 4 can be easily welded along the longitudinal direction so that the bottom surface of the welded portion and the surface of the base plate 2 are flush, without requiring excessive technical skill from the operator, thereby reducing the burden on the operator. [Explanation of Symbols]

[0045] 1 Temporary road surface 2 bottom plate 3 flat plate 4. Welded section 10 Arc cutting equipment 20 Mounting jig 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 base plates and connecting plates provided to span across a plurality of the base plates, The connecting plate is welded to the surface of each of the multiple base plates to connect the multiple base plates, and a welded portion is formed along at least a part of its edge. A cutting step for cutting the welded portion, The connection between the multiple base plates can be released by a separation step that separates the connecting plate and the base plate after the cutting step. In the aforementioned cutting process, A process of melting the welded portion by an arc generated toward the welded portion, The process involves simultaneously performing both the blowing away of the molten welded area by ejecting compressed air, A temporary road surface demolition method characterized by the following features.

2. The thickness of the connecting plate is set to be less than or equal to half the thickness of the base plate. The temporary road surface demolition method according to feature 1.

3. The cutting process is performed with a wall material placed on the base plate to receive the welded portion blown away by the ejection of compressed air. A method for dismantling a temporary road surface according to either claim 1 or claim 2.

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