Attachment jig for work board, installation method for work board, and safety equipment for work board

Abstract

To provide an attachment jig for a work board, an installation method for the work board, and safety equipment for the work board allowing easy installation of the work board.SOLUTION: An attachment jig 100 for a work board is provided with: a base member 1 having a base body part 10 installed above an existing roof member 92; a sandwich member 3 arranged on the base body part 10 to sandwich the work board 4 placed on an upper surface 11u of the base body part 10 with the base body part 10; and a washer 2 into which a machine screw 97 inserted into a through hole is inserted, wherein the through hole into which the machine screw 97 to fix the existing roof member 92 can be inserted is formed in the base body part 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work plate mounting jig, a work plate installation method, and a work plate safety device. [Background technology]

[0002] Conventionally, there has been known a folded-plate roof as disclosed in the following Patent Document 1. In roof renovation work including a folded-plate roof, a work board that serves as a walkway is sometimes installed above the existing roof. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-125608 Summary of the Invention [Problem to be solved by the invention]

[0004] However, to secure the work board to the existing roof, a work board is created using components such as a single pipe base, single pipes, and clamps, but this requires a lot of lateral movement when transporting the components on the roof, which is extremely time-consuming.When installing the work board on the top of a straight roof, the screws that secure the roofing material must be removed first to secure the single pipe base, which can result in the screws being lost or damaged.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and provides a work plate mounting jig that allows a work plate to be easily installed, a work plate installation method, and a work plate safety device. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following means. The work board mounting jig of the present invention comprises a base member having a base main body portion that is installed above the existing roof material, and a clamping member that is provided on the base main body portion and clamps the work board that is placed on the upper surface of the base main body portion between the base main body portion and the base main body portion.

[0007] With the work plate mounting jig configured in this way, the base body is installed on the top surface of the existing roof material. By sandwiching the work plate between the top surface of the base body and the clamping member, the work plate is installed along the top surface of the base body. There is no need to use components such as a single pipe base, single pipe, or clamps. Therefore, by using the work plate mounting jig, the work plate can be easily installed.

[0008] In addition, in the work board mounting jig of the present invention, the base main body portion may have a through hole formed therein through which a screw for fixing the existing roof material can be inserted, and may be provided with a washer through which the screw inserted into the through hole can be inserted.

[0009] With this type of work plate mounting jig, the screws securing the existing roofing material are inserted into the through holes formed in the base body. The base member is installed on top of the existing roofing material by loosening the screws, inserting the washers, and then screwing the screws back in. Because the screws securing the existing roofing material are used, no additional screws are required. Therefore, using the work plate mounting jig makes it easy to install the work plate.

[0010] In addition, in the work plate mounting jig of the present invention, the clamping member may have a fixed plate portion fixed to the base main body portion, a bent plate portion extending upward from the fixed plate portion, and a clamping plate portion provided on the bent plate portion and pressing the work plate from above.

[0011] In the work plate mounting jig configured in this manner, the height of the work plate is secured by the height of the bent plate portion, and the work plate can be installed by pressing the work plate from above with the clamping plate portion.

[0012] In the work plate mounting jig according to the present invention, the fixed plate portion may be detachably fixed to the base main body portion.

[0013] In the work plate mounting jig configured in this manner, the fixed plate portion is detachably fixed to the base body portion, so that the work plate can be inserted below the clamping plate portion with the fixed plate portion removed from the base body portion and positioned above the base body portion, making it easy to position the work plate.

[0014] In addition, in the work plate mounting jig of the present invention, the washer may have a washer main body portion arranged along the upper surface of the base main body portion, and a groove formed from the edge of the washer main body portion toward the center, through which the screw can be inserted.

[0015] With this type of work plate mounting jig, screws can be inserted into the grooves formed from the edge of the washer body toward the center, eliminating the need to remove the screws first, improving workability.

[0016] In addition, the work board installation method of the present invention is a method for installing a work board using the work board mounting jig described above, and includes a base member installation process for installing the base member along the upper surface of the existing roof material, and a work board installation process for installing the work board so that it is sandwiched between the clamping member and the base main body portion.

[0017] In the work plate installation method configured in this manner, the base body is installed on the top surface of the existing roof material in the base member installation process. In the work plate installation process, the work plate is sandwiched between the top surface of the base body and the clamping member, so that the work plate is installed along the top surface of the base body. There is no need to use components such as a single pipe base, single pipe, or clamps. Therefore, the work plate can be easily installed by using a work plate mounting jig.

[0018] In addition, the safety equipment for a work plate according to the present invention comprises two pillars installed at a distance in a first direction on the upper surface of an existing roof material, a lifeline stretched between the two pillars, a work plate mounting jig as described in claim 1 or 2 which is installed along the upper surface of the existing roof material on one side of a second direction which intersects with the first direction and is horizontal, and a work plate which is installed so as to be sandwiched between the clamping member and the base main body, and the pillars are combined in a tripod-like manner with a set of three legs of the same shape and dimensions, and the upper ends of the legs are connectable in a relatively rotatable and disassembled state, and the lower ends of the legs are removably connected to the existing roof material via fixing brackets.

[0019] With this type of safety equipment for the work plate, two supports can be easily installed on the top surface of the existing roof material, and the work plate can be easily installed using the work plate mounting jig installed on the top surface of the existing roof material. Therefore, by using the life rope stretched between the supports, work safety can be fully ensured when performing various tasks on the work plate.

[0020] The safety equipment for a work board according to the present invention may also include a fall prevention net supported by the life rope and deployed between the two supports.

[0021] In this type of safety equipment for work platforms, the fall prevention net is supported by the lifeline and deployed between the two posts, further enhancing the safety of work on the work platform. [Effects of the Invention]

[0022] According to the work plate mounting jig, work plate installation method, and work plate safety equipment of the present invention, the work plate can be easily installed. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a cross-sectional view showing a state in which a work plate is installed using a work plate mounting jig according to one embodiment of the present invention. FIG. [Figure 2]10A to 10C are diagrams showing a base member installation step in the method for installing a work plate according to one embodiment of the present invention. [Figure 3] 10A and 10B are diagrams showing a screw-threading step in the method for installing the work plate according to one embodiment of the present invention. [Figure 4] 1 is a cross-sectional view showing a state in which a work plate is installed using a work plate mounting jig according to one embodiment of the present invention. FIG. [Figure 5] 10A to 10C are diagrams showing a work plate installation step of the work plate installation method of one embodiment of the present invention. [Figure 6] 6 is a diagram showing a work plate installation step of the work plate installation method of one embodiment of the present invention, which is a step subsequent to the step shown in FIG. 5. FIG. [Figure 7] 10 is a cross-sectional view showing a state in which a work plate is installed using a work plate mounting jig according to a modified example of an embodiment of the present invention. FIG. [Figure 8] 1 is a perspective view showing a safety device for a work plate according to an embodiment of the present invention. FIG. [Figure 9] FIG. 2 is a side view showing a safety device of the working plate according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] (Work plate mounting jig) A mounting jig for a work plate according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the work plate mounting jig according to this embodiment is used when installing a work plate above an existing roof material during roof material repair work or the like.

[0025] FIG. 1 is a cross-sectional view showing a state in which a work plate is installed using a work plate mounting jig according to one embodiment of the present invention. As shown in Fig. 1, the existing roof includes roof beams 91 and a plurality of roof materials 92. The plurality of roof materials 92 correspond to the existing roof materials in the claims.

[0026] Here, the direction along the horizontal direction in which the roof beams 91 extend is defined as the beam direction X. The direction perpendicular to the beam direction X and from the top to the bottom of the roof material 92 is defined as the gradient direction Y. The direction perpendicular to the beam direction X and gradient direction Y is defined as the normal direction Z.

[0027] The roof beams 91 extend in the beam direction X. A plurality of the roof beams 91 are installed at intervals in the slope direction Y. The roof beams 91 are fixed to the skeleton of the building (not shown). In this embodiment, the roof beams 91 are C-shaped steel beams formed into a C-shape when viewed from the beam direction X. The shape of the roof beams 91 can be set as appropriate.

[0028] FIG. 2 is a diagram showing a base member installation step in the method of installing the work plate. As shown in Fig. 2, the roofing materials 92 are arranged along the beam direction X and the gradient direction Y. The roofing materials 92 are formed in a corrugated shape. A plurality of the roofing materials 92 are arranged in the beam direction X and the gradient direction Y.

[0029] The roof material 92 has an upper plate portion 93, a lower plate portion 94, and an inclined plate portion 95. The upper plate portion 93 is formed in a plate shape. The plate surface of the upper plate portion 93 faces the normal direction Z. The upper plate portion 93 has a rectangular shape that is long in the gradient direction Y. Multiple upper plate portions 93 are arranged at intervals in the beam direction X. The lower plate portion 94 is formed in a plate shape. The plate surface of the lower plate portion 94 faces the normal direction Z. The lower plate portion 94 has a rectangular shape that is long in the gradient direction Y. Multiple lower plate portions 94 are arranged at intervals in the beam direction X. The inclined plate portion 95 connects the end of the upper plate portion 93 in the beam direction X and the end of the lower plate portion 94 in the beam direction X. The inclined plate portion 95 is inclined with respect to the normal direction Z. The upper surface 93u of the upper plate portion 93 corresponds to the upper surface of the existing roof material in the claims.

[0030] As shown in Figure 1, before the work board is installed, on the existing roof, the roof material 92 is screwed to the roof beam 91 with a screw 97. The screw 97 is inserted into the mounting hole in the upper panel portion 93 of the roof material 92 and screwed to the roof beam 91.

[0031] As shown in FIG. 2, a work plate mounting jig (hereinafter simply referred to as the “mounting jig”) 100 includes a base member 1, a washer 2, and a clamping member 3.

[0032] The base member 1 has a base main body portion 10 and a through hole 15 formed in the base main body portion 10. The base main body portion 10 has a work plate support plate portion 11 and an end plate portion 12.

[0033] The work plate support plate 11 is formed in a plate shape. The work plate support plate 11 is arranged along the upper surface 93u of the upper plate portion 93 of the roof material 92. When the work plate support plate 11 is arranged along the upper surface 93u of the upper plate portion 93 of the roof material 92, the plate surface of the work plate support plate 11 faces the normal direction Z. The work plate support plate 11 has a substantially rectangular shape with the gradient direction Y as its long side direction and the beam direction X as its short side direction.

[0034] The end plate portions 12 are provided at both ends of the work plate support plate portion 11 in the beam direction X. When the work plate support plate portion 11 is arranged along the upper surface 93u of the upper plate portion 93 of the roof material 92, the end plate portions 12 are inclined with respect to the normal direction Z so as to gradually move away from the paired end plate portion 12 as they extend downward in the normal direction Z. The end plate portions 12 are arranged along the outside of the inclined plate portions 95 of the roof material 92.

[0035] The through holes 15 are formed to penetrate the work plate support plate 11 in the plate thickness direction. The through holes 15 are formed at two locations spaced apart in the beam direction X on the upper side of the work plate support plate 11 and at two locations spaced apart in the beam direction X on the lower side of the work plate support plate 11. The through holes 15 are sized to allow screws 97 to be inserted therethrough. The through holes 15 on the upper side of the work plate support plate 11 are longer in the gradient direction Y than the through holes 15 on the lower side of the work plate support plate 11.

[0036] The washer 2 has a washer body 21 and a recessed groove 23 formed in the washer body 21.

[0037] The washer body 21 is formed in a plate shape. In the illustrated example, the washer body 21 is rectangular, but it may also be circular, and the shape can be set as appropriate. The groove 23 penetrates the washer body 21 in the plate thickness direction. The groove 23 is formed from the edge of the washer body 21 toward the center.

[0038] With the washer body 21 of the washer 2 arranged along the upper surface of the clamping member 3, a bolt 35 (described later) can be inserted into the recessed groove 23 of the washer 2.

[0039] FIG. 3 is a diagram showing a screw-engaging step in the method of installing the work plate. As shown in Figure 3, when the washer main body portion 21 of the washer 2 is positioned along the upper surface 11u of the work plate support plate portion 11 of the base main body portion 10, a screw 97 can be inserted into the groove 23 of the washer 2.

[0040] 2, the clamping member 3 has a fixed plate portion 31, a bent plate portion 32, and a clamping plate portion 33. The bent plate portions 32 are provided on both sides of the clamping plate portion 33 in the gradient direction Y. A fixed plate portion 31 is provided on each of the pair of bent plate portions 32. The clamping member 3 is formed in a hat shape as a whole.

[0041] FIG. 4 is a cross-sectional view showing a state in which the work board 4 is installed using the mounting jig 100. As shown in FIG. As shown in FIG. 4, the fixing plate 31 is disposed along the upper surface 11u of the work plate support plate 11 of the base member 1. The fixing plate 31 is formed in a plate shape. When the fixing plate 31 is disposed along the upper surface 11u of the work plate support plate 11, the plate surface of the fixing plate 31 faces the normal direction Z. As shown in FIG. 3, a bolt 35 inserted into an attachment hole formed in the fixing plate 31 is fastened by burring processing (not shown) on the underside of the work plate support plate 11 of the base main body 10. In this way, the fixing plate 31 is fixed to the work plate support plate 11. By loosening the bolt 35, the fixing plate 31 can be detached from the work plate support plate 11 and moved away from the work plate support plate 11.

[0042] The bending plate portion 32 extends upward from the fixed plate portion 31. The clamping plate portion 33 is provided on the bending plate portion 32. The clamping plate portion 33 connects a pair of bending plate portions 32 that are spaced apart in the gradient direction Y. The clamping plate portion 33 is configured by a plate-shaped anti-slip rubber. The plate surface of the clamping plate portion 33 faces the normal direction Z. The clamping plate portion 33 is disposed above the normal direction Z of the work plate support plate portion 11 of the base main body portion 10. A bolt 36 inserted into an attachment hole formed in the clamping plate portion 33 is fastened by a burring process (not shown) on the underside of the work plate support plate portion 11 of the base main body portion 10. The clamping plate portion 33 is fixed to the base member 1 by fastening the bolt 36. By loosening the bolt 36, the clamping plate portion 33 can be moved in a direction away from the work plate support plate portion 11.

[0043] 4, the work plate 4 is sandwiched between the upper surface 11u of the work plate support plate portion 11 of the base member 1 and the clamping plate portion 33 of the clamping member 3. The clamping plate portion 33 presses the work plate 4 from above.

[0044] (How to install the work board) Next, a method for installing the work plate according to the first embodiment of the present invention will be described. As shown in FIG. 2, the washer 2 is placed above the fixed plate portion 31 of the clamping member 3 in advance, and the bolt 35 is inserted into the recessed groove 23 of the washer 2, and then the bolt 35 is fastened to the nut.

[0045] The base member installation process is carried out. As shown in FIG. 2, the mounting jig 100 is installed on the upper surface 93u of the roof material 92. The installation direction of the mounting jig 100 is determined so that the shorter side of the through hole 15 of the mounting jig 100 in the gradient direction Y is on the lower side (downstream side) of the gradient direction Y. The heads of the screws 97 that secure the roof material 92 are inserted into the through holes 15 of the work board support plate portion 11. In this manner, multiple mounting jigs 100 are installed at intervals along the longitudinal direction of the work board 4.

[0046] The screw threading process is performed. The bolt 35 securing the washer 2 to the fixed plate portion 31 of the clamping member 3 is loosened, and the washer 2 is pulled out along the groove 23 of the washer 2, removing the washer 2 from the bolt 35. As shown in FIG. 3 , the screw 97 securing the roofing material 92 is slightly loosened, and the screw 97 is inserted into the groove 23 of the washer 2. The washer 2 is moved into the back of the groove 23 until it contacts the screw 97. The screw 97 is then threaded in. As a result, the washer 2 is sandwiched between the head of the screw 97 and the work plate support plate portion 11, and the screw 97 is fixed to the roof beam 91. Note that the screw 97 may be used at four locations as in the illustrated example, or may be used at two locations in total: one location on the upper side of the work plate support plate portion 11 and one location on the lower side of the work plate support plate portion 11.

[0047] In the work plate installation step, the bolts 35 and 36 are loosened until a sufficient height is secured for the work plate 4 to fit between the clamping plate portion 33 and the fixed plate portion 31 of the clamping member 3.

[0048] As shown in Figure 5, with the fixing plate portion 31 of the clamping member 3 raised above the work plate support plate portion 11, the work plate 4 is inserted below the bolt 36 in the gradient direction Y (below the water). Next, the work plate 4 is inserted above the bolt 36 in the gradient direction Y (above the water).

[0049] After fastening the bolt 36, the bolts 35 on both sides are fastened. The work plate 4 is sandwiched between the clamping plate portion 33 of the clamping member 3 and the work plate support plate portion 11 of the base member 1.

[0050] In the mounting jig 100 and work plate installation method configured in this manner, the base main body 10 is installed on the upper surface 93u of the roof material 92. By sandwiching the work plate 4 between the upper surface 11u of the base main body 10 and the clamping member 3, the work plate 4 is installed along the upper surface 11u of the base main body 10. There is no need to use components such as a single pipe base, single pipe, or clamp. Therefore, by using the mounting jig 100, the work plate 4 can be easily installed.

[0051] Furthermore, the screw 97 that secures the roof material 92 is inserted into the through hole 15 formed in the base main body 10. The screw 97 is loosened, a washer 2 is inserted, and the screw 97 is then screwed in, thereby installing the base member 1 on top of the roof material 92. Since the screw 97 that secures the roof material 92 is used, no other screws are required. Therefore, by using the mounting jig 100, the work board 4 can be easily installed.

[0052] Furthermore, the height of the work plate 4 is ensured by the height of the bent plate portion 32 of the clamping member 3, and the work plate 4 can be set by pressing the work plate 4 from above with the clamping plate portion 33.

[0053] Furthermore, the fixed plate portion 31 of the clamping member 3 is detachably fixed to the base main body portion 10. Therefore, with the fixed plate portion 31 removed from the base main body portion 10 and positioned above the base main body portion 10 in the normal direction Z, the working plate 4 can be inserted below the clamping plate portion 33, making it easy to position the working plate 4.

[0054] Furthermore, the screw 97 can be inserted into the recessed groove 23 formed from the edge toward the center of the washer body 21 of the washer 2. Therefore, there is no need to remove the screw 97 once, which improves workability.

[0055] (Variation) Next, a modified example of the embodiment shown above will be described mainly with reference to Fig. 7. In the following description of the modified example, the same reference numerals will be used to designate the same or similar members and parts as those in the above-described embodiment, and a description thereof will be omitted, and only configurations different from the embodiment will be described.

[0056] FIG. 7 is a cross-sectional view showing a state in which a work plate is installed using a work plate mounting jig according to a modified example of one embodiment of the present invention. As shown in Figure 7, the existing roof of this modified example has a roofing material 92A (for example, a seam) where adjacent roof boards are joined together. Mounting brackets 98 are fixed to the roofing material 92A,

[0057] The mounting jig 100A comprises a base member 1A and a clamping member 3. The work plate support plate 11A of the base main body 10A of the base member 1A is arranged along the upper surface 92u of the roof material 92A. End plate portions 12A are provided at both ends of the work plate support plate 11A in the gradient direction Y. The end plate portions 12A are inclined with respect to the normal direction Z so as to gradually move away from their paired end plate portions 12A as they extend upward in the normal direction Z. The end plate portions 12A have press bolts 16 fixed to the mounting bracket 98 by burring.

[0058] With the mounting jig 100A configured in this manner, the base main body 10A is installed on the upper surface 92u of the roofing material 92A. By sandwiching the work plate 4 between the upper surface 11u of the base main body 10A and the clamping member 3, the work plate 4 is installed along the upper surface 11u of the base main body 10A. There is no need to use components such as a single pipe base, single pipe, or clamp. Therefore, by using the mounting jig 100A, the work plate 4 can be easily installed.

[0059] (Safety equipment for work boards) A safety device for a work plate according to a first embodiment of the present invention will be described mainly with reference to Figures 8 and 9. In the following description of the embodiment, the same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and a description thereof will be omitted, and only configurations different from the embodiment will be described.

[0060] Fig. 8 is a perspective view showing a safety device for a work platform of one embodiment of the present invention. A fall prevention net is not shown in Fig. 8. Fig. 9 is a side view showing the safety device for a work platform of one embodiment of the present invention. As shown in FIGS. 8 and 9, the safety equipment 200 for the work platform includes the mounting jig 100, the work platform 4, two support posts 5, a life rope 6, and a fall prevention net 7.

[0061] The support pillar 5 is configured by combining a set of three legs 51 of the same shape and size in a tripod shape. The upper ends of the legs 51 can be connected to each other in a relatively rotatable and disassembled state. The lower ends of the legs 51 are detachably connected to the upper surface 92u of the existing roof material 92 via fixing brackets 53.

[0062] Two support columns 5 are arranged at an interval in the beam direction X. It should be noted that two or more support columns 5 may be arranged. The beam direction X corresponds to the first direction in the claims.

[0063] The life rope 6 is installed between two support posts 5. As shown in Figure 9, the fall prevention net 7 is installed in an unfolded state between the two support posts 5 and supported by the life rope 6. The lower end of the fall prevention net 7 may be connected to the existing roof material 92.

[0064] 8, the mounting jig 100 is installed on one side of the gradient direction Y that intersects with the direction (beam direction X) connecting the two supports 5. The gradient direction Y corresponds to the second direction in the claims.

[0065] With the work plate safety equipment 200 configured in this manner, two support posts 5 can be easily installed on the upper surface 92u of the existing roof material 92, and the work plate 4 can be easily installed using the mounting jig 100 for the work plate 4 installed on the upper surface 92u of the existing roof material 92. Therefore, by using the life rope 6 installed between the support posts 5, work safety can be fully ensured when performing various tasks on the work plate 4.

[0066] Furthermore, the fall prevention net 7 is supported by the life rope 6 and is deployed between the two support posts 5. This further enhances the safety of work on the work platform 4.

[0067] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0068] For example, in the embodiment described above, the fixed plate portion 31 of the clamping member 3 is detachably fixed to the base main body portion 10, but this is not limited to this. The fixed plate portion 31 of the clamping member 3 may be undetachably fixed to the base main body portion 10 by welding or the like. The length of the bending plate portion 32 of the clamping member 3 in the normal direction Z may be configured to be adjustable, and the length of the bending plate portion 32 in the normal direction Z may be adjusted depending on the height of the working plate 4.

[0069] In addition, in the embodiment described above, two work plates 4 are inserted into one clamping member 3, but this is not limited to this. The number of work plates 4 inserted into one clamping member 3 may be one, or three or more.

[0070] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The work plate mounting jig 100 and work plate installation method according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation." [Explanation of symbols]

[0071] 1,1A Base material 2 washers 3 Holding member 4 Work board 5 pillars 6 Main rope 7 Fall prevention net 10,10A Base body 15 through holes 21 Washer body 23 Groove 31 Fixed plate part 32 Bent plate part 33 Holding plate part 92, 92A Roofing material (existing roofing material) 97 bis 100,100A Mounting jig (Work plate mounting jig) 200 Safety equipment for work board

Claims

1. A base member having a base main body portion to be installed above the existing roof material; a clamping member provided on the base main body portion for clamping a work plate placed on the upper surface of the base main body portion between the base main body portion and the clamping member;

2. The base body has a through hole through which a screw for fixing the existing roof material can be inserted, The work plate mounting jig according to claim 1 , further comprising a washer into which the screw inserted into the through hole is inserted.

3. The clamping member is a fixing plate portion fixed to the base main body portion; a bent plate portion extending upward from the fixed plate portion; 3. The work plate mounting jig according to claim 1, further comprising a clamping plate portion provided on the bending plate portion and pressing the work plate from above.

4. The work plate mounting jig according to claim 3 , wherein the fixed plate portion is detachably fixed to the base body portion.

5. The washer is a washer body portion disposed along an upper surface of the base body portion; 3. The work plate mounting jig according to claim 2, further comprising a recess formed from an edge of the washer body toward a center thereof, the recess allowing the screw to be inserted therethrough.

6. A method for installing a work plate using the work plate mounting jig according to claim 1 or 2, comprising: a base member installation process of installing the base member along the upper surface of the existing roof material; a work plate installation step of installing the work plate so that it is sandwiched between the clamping member and the base main body portion.

7. Two supports installed at intervals in a first direction on an upper surface of the existing roof material; A life rope installed between the two supports; The work board mounting jig according to claim 1 or 2 is installed along the upper surface of the existing roof material on one side in a second direction that intersects with the first direction and is aligned horizontally; a work plate that is sandwiched between the clamping member and the base body portion, The support pillar is a tripod-shaped set of three legs of the same shape and size, and the upper ends of the legs are connectable in a relatively rotatable and disassembled state, A safety device for a work board in which the lower end of the leg body is detachably connected to the existing roof material via a fixing bracket.

8. 8. The safety equipment for a work platform according to claim 7, further comprising: a fall prevention net supported by the life rope and deployed between the two supports.

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